RF1487-000

GDT, 75V, 1KA, 2 TERMINAL SMD

⚠️ Reference pricing provided. In case of supply shortages, we will connect you with our trusted procurement partners to ensure your project's continuity.
Manufacturer: LITTELFUSE
Product type: Gas Discharge Tubes - GDT
Product Range:GTCS23-XXXM-R01-2 Series; DC Breakover Voltage:75V; GDT Case Style:2 Terminal SMD; Impulse Discharge Current:1kA; Impulse Sparkover Voltage:600V 34AK1009
Product Range: GTCS23-XXXM-R01-2 Series
GDT Case Style: 2 Terminal SMD
DC Breakover Voltage: 75V
Impulse Discharge Current: 1kA
Impulse Sparkover Voltage: 600V
Delivery and price
Units per pack	250
Price	0.726 €
Current stock	1000+
Lead time	30 days
Datasheet
## **GAS DISCHARGE TUBES (GDTS)** 

Littelfuse's GDTs (Gas Discharge Tubes) are placed in front of, and in parallel with, sensitive telecom equipment such as power lines, communication lines, signal lines and data transmission lines to help protect them from damage caused by transient surge voltages that may result from lightning strikes and equipment switching operations. These devices do not influence the signal in normal operation. However, in the event of an overvoltage surge, such as a lightning strike, the GDT switches to a low impedance state and diverts the energy away from the sensitive equipment. 

Our GDTs offer a high level of surge protection, a broad voltage range, low capacitance, and many form factors including new surface mount devices, which makes them suitable for applications such as Main Distribution Frame (MDF) modules, high data-rate telecom applications (e.g. ADSL, VDSL), and surge protection on power lines. Their low capacitance also results in less signal distortion. When used in a coordinated circuit protection solution with PolySwitch devices, they can help equipment manufacturers meet stringent safety regulatory standards. 

## **BENEFITS** 

- Helps provide overvoltage fault protection against damage caused by high energy surges 

- Suitable for use in  sensitive equipment due to impulse sparkover response 

- Suitable for high-frequency applications 

- Highly reliable performance 

## **APPLICATIONS** 

   - Telecommunications 

   - MDF modules, xDSL equipment, RF systems, antenna, base stations 

   - Industrial and Consumer Electronics 

   - Power supplies, surge protectors, alarm systems, irrigation systems 

- New surface-mount devices for automated manufacturing 

## **FEATURES** 

- RoHS compliant 

- Halogen free 

- (refers to: Br _[≥]_ 900ppm, Cl _[≥]_ 900ppm, Br+Cl _[≥]_ 1500ppm) 

- Wide range of voltages (75V-4000V) 

- Wide range of form factors (3mm, 5mm, 6mm, 7mm, 8mm diameter devices) 

   - Devices tested per ITU K.12 recommendations 

   - Various lead configurations and surface-mount options 

   - Optional fail-short mechanism 

   - Non radioactive materials 

   - Devices certified to UL497B and UL1449 

- Low capacitance and insertion loss 

- Crowbar device with low arc voltage 

- High accuracy spark-over voltages for high precision designs 

Specifications subject to change without notice. ©2016 Littelfuse, Inc. 

73 

RoHS Compliant, ELV Compliant 

**Gas Discharge Tubes (GDTs)** 

Figures G1-G2 — Typical Circuits for Gas Discharge Tubes 

**==> picture [528 x 136] intentionally omitted <==**

**----- Start of picture text -----**<br>
Figure G1 Figure G2<br>Two Electrode Devices for Ungrounded Circuits Three Electrode Devices for Grounded Circuits<br>PolySwitch Device PolySwitch Device<br>(A) (A’) (A) (A’)<br>Telecom Protected Telecom Protected<br>Line GDT Equipment Line GDT Equipment<br>(B) Thyristor (B’) (B) Thyristors (B’)<br>PolySwitch<br>Device<br>**----- End of picture text -----**<br>


Table G1 — Device Voltage Ratings, Surge Rating, Capacitance, Insulation Resistance and Agency Approval for Two-Electrode Gas Discharge Tubes 

**==> picture [528 x 164] intentionally omitted <==**

**----- Start of picture text -----**<br>
DC Impulse Impulse<br>Sparkover Sparkover Impulse Withstanding Insulation<br>Voltage Voltage Discharge Current Voltage Capacitance Resistance UL Rating<br>8x20μs 8x20μs 10/700μs<br>10 Hits 300 Hits 10 Hits<br>@ 100V/s (5 Hits Each (150 Hits Each (5 Times Each<br>Part Number ± 20% Tolerance @ 1kV/μs Polarity) Polarity) Polarity) @1MHz @100VDC [†] UL497B    #E179610<br>75* 600<br>90 600<br>GTCS23-XXXM-R01-2 1kA 100A 4kV <0.5pF 1,000 (MΩ) All Devices<br>140 600<br>150 600<br>200 700<br>230 700<br>GTCC23-XXXM-R01-2 300 900 1kA 100A 6kV [‡] <0.5pF 1,000 (MΩ) All Devices<br>350 1000<br>400 1000<br>**----- End of picture text -----**<br>


- DCSO 60~105 

† Devices <=150V measured @ 50VDC 

‡ Effective output impedance: 40ohms 

|**Part Number**|**DC**<br>**Sparkover**<br>**Voltage**<br>**Impulse**<br>**Sparkover Voltage**<br>**DC**<br>**Holdover**<br>**Voltage**<br>**On-State**<br>**Voltage**<br>**Impulse**<br>**Discharge**<br>**Current**<br>**Impulse**<br>**Life**<br>**AC Discharge**<br>**Current**<br>**(1s duration;**<br>**10 hits)**<br>**Capacitance**<br>**Insulation**<br>**Resistance**<br>**UL Rating**|
|---|---|
||**@ 100V/s**<br>**± 20%**<br>**Tolerance**<br>**@ 100V/μs**<br>**@ 1kV/μs**<br>**Per**<br>**ITU K.12**<br>**Nominal**<br>**(@1A)**<br>**(V)**<br>**8x20μs**<br>**10 Hits**<br>**10x1000μs**<br>**300 Hits**<br>**@ 50 Hz**<br>**@ 1MHz**<br>**@ 100VDC**<br>**UL497B**<br>**#E179610**|
|GTCX25-XXXM-R02|75<br>450<br>550<br><52<br>20<br>2.5kA<br>100A<br>2.5Arms<br><1pF<br>10,000 (MΩ)<br>All Devices<br>90<br>450<br>550<br><52<br>20|
|GTCX26-XXXM-R05|140<br>500<br>600<br><80<br>20<br>5kA<br>100A<br>5Arms<br><1pF<br>10,000 (MΩ)<br>All Devices<br>150<br>500<br>600<br><80<br>20<br>200<br>600<br>700<br><135<br>20|
|GTCX28-XXXM-R05|230<br>600<br>700<br><135<br>20<br>5kA<br>100A<br>5Arms<br><1pF<br>10,000 (MΩ)<br>All Devices<br>250<br>600<br>700<br><135<br>20<br>260<br>700<br>800<br><135<br>20<br>300<br>800<br>900<br><150<br>20|
|GTCX28-XXXM-R10|350<br>900<br>1000<br><150<br>20<br>10kA<br>100A<br>10Arms<br><1pF††<br>10,000 (MΩ)<br>All Devices<br>400<br>900<br>1000<br><150<br>20<br>420<br>900<br>1000<br><150<br>20<br>470<br>1050<br>1150<br><150<br>20<br>500<br>1100<br>1200<br><150<br>20|
|GTCX28-XXXM-R20**|550<br>1300<br>1400<br><150<br>20<br>20kA<br>100A<br>20Arms<br><1.5pF<br>10,000 (MΩ)<br>All Devices<br>600<br>1300<br>1400<br><150<br>20|



- ** GTCX28-XXXM-R20 parts only up to 350V 

- †† <1.2pF for 75V and 90V devices. 

Specifications subject to change without notice. ©2016 Littelfuse, Inc. 

74 

RoHS Compliant, ELV Compliant 

## **Gas Discharge Tubes (GDTs)** 

Table G2 — Device Voltage Ratings, Surge Rating, Capacitance, Insulation Resistance and Agency Approval for Two Electrode High-Voltage Gas Discharge Tubes 

**==> picture [528 x 233] intentionally omitted <==**

**----- Start of picture text -----**<br>
DC Impulse Impulse<br>Sparkover Sparkover  AC Discharge Current,  Discharge Current<br>Voltage Voltage Impulse Life 50Hz 8/20μs Capacitance UL Rating<br>@100V/s Multiple Hits<br>± 20%  10/1000μs   (1s Duration:  Single Hit,  10 Hits (5 Hits  UL1449<br>Part Number Tolerance @ 100V/μs 100A 10 Hits) 9 Cycles Each Polarity) 1 Hit @ 1MHz #E332226<br>GTCA28-801M-R05 800 1400 300 times 5A N/A 5kA N/A <1pF 3<br>GTCA28-102M-R03 1000 1700 N/A 1A 5A 3kA 10kA <1pF 3<br>GTCA28-122M-R03 1200 1900 N/A 1A 5A 3kA 10kA <1pF 3<br>1500<br>GTCA28-152L-R03 2200 N/A 1A 5A 3kA 10kA <1pF 3<br>(± 15%)<br>GTCA28-212M-R03 2100 2700 N/A 1A 5A 3kA 10kA <1pF 3<br>GTCA28-242M-R03 2400 3300 N/A 1A 5A 3kA 10kA <1pF 3<br>GTCA28-252M-R03 2500 3500 N/A 1A 5A 3kA 10kA <1pF 3<br>2700<br>GTCA28-272L-R03 3700 300 Times [†] N/A N/A 3kA 10kA <1pF 3<br>(± 15%)*<br>GTCA28-302M-R03 3000 4000 N/A 1A 5A 3kA 10kA <1pF 3<br>3100<br>GTCA28-312L-R03 3700 [‡] 300 Times [†] N/A N/A 3kA 10kA <1pF 3<br>(± 15%)*<br>GTCA28-362M-R03 3600 4600 N/A 1A 5A 3kA 10kA <1pF 3<br>GTCA28-402M-R03 4000 5000 N/A 1A 5A 3kA 10kA <1pF 3<br>**----- End of picture text -----**<br>


Table G3 — Device Voltage Ratings, Surge Rating, Capacitance, Insulation Resistance and Agency Approval for Three-Electrode Gas Discharge Tubes 

|**Part Number**|**DC**<br>**Sparkover**<br>**Voltage**<br>**(A-E) (B-E)**<br>**Impulse**<br>**Sparkover Voltage**<br>**(A-E) (B-E)**<br>**DC**<br>**Holdover**<br>**Voltage**<br>**On-State**<br>**Voltage**<br>**Impulse**<br>**Discharge**<br>**Current**<br>**(A+B-E)**<br>**Impulse**<br>**Life**<br>**(A+B-E)**<br>**AC Discharge**<br>**Current**<br>**(1s duration;**<br>**10 hits)**<br>**(A+B-E)**<br>**Capacitance**<br>**Insulation**<br>**Resistance**<br>**UL Rating**|
|---|---|
||**@ 100V/s**<br>**± 20%**<br>**Tolerance**<br>**@ 100V/μs**<br>**@ 1kV/μs**<br>**Per**<br>**ITU K.12**<br>**Nominal**<br>**(@1A)**<br>**(V)**<br>**8x20μs**<br>**10 Hits**<br>**10x1000μs**<br>**300 Hits**<br>**@ 50 Hz**<br>**@ 1MHz**<br>**@ 100VDC***<br>**UL497B**<br>**#E179610**|
|GTCX35-XXXM-R05|75<br>450<br>550<br><52<br>20<br>5kA<br>100A<br>5Arms<br><1pF<br>10,000 (MΩ)<br>All Devices<br>90<br>450<br>550<br><52<br>20|
|GTCX36-XXXM-R05|140<br>500<br>600<br><80<br>20<br>5kA<br>200A<br>5Arms<br><1pF<br>10,000 (MΩ)<br>All Devices<br>150<br>500<br>600<br><80<br>20<br>200<br>600<br>700<br><135<br>20|
|GTCX36-XXXM-R10|230<br>600<br>700<br><135<br>20<br>10kA<br>200A<br>10Arms<br><1pF<br>10,000 (MΩ)<br>All Devices<br>250<br>600<br>700<br><135<br>20<br>260<br>700<br>800<br><135<br>20<br>300<br>800<br>900<br><150<br>20|
|GTCX37-XXXM-R10|350<br>900<br>1000<br><150<br>20<br>10kA<br>200A<br>10Arms<br><1pF<br>10,000 (MΩ)<br>All Devices<br>400<br>900<br>1000<br><150<br>20<br>420<br>900<br>1000<br><150<br>20<br>470<br>1050<br>1150<br><150<br>20<br>500<br>1100<br>1200<br><150<br>20|
|GTCX38-XXXM-R10|550<br>1300<br>1400<br><150<br>20<br>10kA<br>200A<br>10Arms<br><1pF<br>10,000 (MΩ)<br>All Devices<br>600<br>1300<br>1400<br><150<br>20|



* Insulation resistance measured at 50V for devices less than 150V. Insulation resistance measured at 250V for devices more than 500V. 

Specifications subject to change without notice. ©2016 Littelfuse, Inc. 

75 

RoHS Compliant, ELV Compliant 

## **Gas Discharge Tubes (GDTs)** 

## Figures G3-G11 — Dimensions for Gas Discharge Tubes 

Figure G3 — Two Electrode 3mm Product Dimensions 

**==> picture [321 x 215] intentionally omitted <==**

**----- Start of picture text -----**<br>
Surface-mount Pad Layout - Surface-mount Devices<br>(GTCS23-XXXM-R01) (GTCS23-XXXM-R01)<br>X<br>1.0 1.0 Z1 Y Z2<br>4.5 ± 0.2 3.0 ± 0.2<br>Chip GDT Pad Layout - Chip GDT Devices<br>(GTCC23-XXXM-R01) (GTCC23-XXXM-R01)<br>X<br>0.5 0.5<br>4.5 ± 0.3 3.2 ± 0.2 Z1 Y Z2<br>ø3.0<br>3.0 ± 0.2<br>2.7 ± 0.2<br>**----- End of picture text -----**<br>


||**X**|**Y**|**Z1**|**Z2**|
|---|---|---|---|---|
||**Nom**|**Nom**|**Nom**|**Nom**|
|mm|3.0|2.0|2.0|2.0|
|in*|0.118|0.079|0.079|0.079|



- The dimensions in inches are rounded approximations. 

||**X**|**Y**|**Z1**|**Z2**|
|---|---|---|---|---|
||**Nom**|**Nom**|**Nom**|**Nom**|
|mm|3.5|2.7|2.0|2.0|
|in*|0.138|0.106|0.079|0.079|



- The dimensions in inches are rounded approximations. 

## Figure G4 — Two Electrode 5mm Product Dimensions 

**==> picture [291 x 118] intentionally omitted <==**

**----- Start of picture text -----**<br>
Axial Leads No Leads<br>(GTCA25-XXXM-R02) (GTCN25-XXXM-R02) [†]<br>60.0 ± 4.0<br>(2.364 ± 0.158)<br>ø0.8<br>(0.032)REF 5.0 ± 0.2<br>(0.197 ± 0.008)<br>5.0 ± 0.2<br>(0.197 ± 0.008)<br>5.00 ± 0.15<br>(0.197 ± 0.006)<br>5.00 ± 0.15<br>(0.197 ± 0.006)<br>**----- End of picture text -----**<br>


## **Surface-mount (GTCS25-XXXM-R02)** 

**==> picture [160 x 70] intentionally omitted <==**

**----- Start of picture text -----**<br>
0.5<br>(0.020)REF<br>4.4 ± 0.2 5.0 ± 0.2<br>(0.173 ± 0.008) (0.197 ± 0.008)<br>5.0 ± 0.2<br>(0.197 ± 0.008)<br>**----- End of picture text -----**<br>


**Pad Layout - Surface-mount Devices (GTCS25-XXXM-R02)** 

|X|X|Y|Y|||Z|**X**<br>**Y**<br>**Z**<br>**Nom**<br>**Nom**<br>**Nom**<br>mm<br>6.0<br>3.9<br>1.3<br>in*<br>0.236<br>0.154<br>0.051|
|---|---|---|---|---|---|---|---|
|||||||||
|||||||||
|||||||||



- The dimensions in inches are rounded approximations. 

- Parts with no leads are not solderable and are meant for insertion into magazine clips. 

Specifications subject to change without notice. ©2016 Littelfuse, Inc. 

76 

RoHS Compliant, ELV Compliant 

## **Gas Discharge Tubes (GDTs)** 

## Figures G3-G11 — Dimensions for Gas Discharge Tubes 

(Cont’d) 

## Figure G5 — Two Electrode 6mm Product Dimensions 

**==> picture [267 x 115] intentionally omitted <==**

**----- Start of picture text -----**<br>
Axial Leads No Leads<br>(GTCA26-XXXM-R05) (GTCN26-XXXM-R05) [†]<br>62.0 ± 2.0<br>(2.441 ± 0.079)<br>ø0.8<br>4.2 ± 0.2<br>(0.032)REF<br>(0.165 ± 0.008)<br>4.2 ± 0.2<br>(0.165 ± 0.008)<br>ø6.0 ± 0.2<br>(0.236 ± 0.008)<br>ø6.0 ± 0.2<br>(0.236 ± 0.008)<br>**----- End of picture text -----**<br>


**==> picture [153 x 99] intentionally omitted <==**

**----- Start of picture text -----**<br>
Surface-mount<br>(GTCS26-XXXM-R05)<br>0.6<br>4.2 ± 0.2 (0.024)REF 6.2 ± 0.2<br>(0.165 ± 0.008) (0.244 ± 0.008)<br>ø6.0 ± 0.2 6.2 ± 0.2<br>(0.236 ± 0.008) (0.244 ± 0.008)<br>**----- End of picture text -----**<br>


## **Pad Layout - Surface-mount Devices (GTCS26-XXXM-R05)** 

|Y|Z||
|---|---|---|
|||**X**<br>**Y**<br>**Z**<br>**Nom**<br>**Nom**<br>**Nom**|
|||mm<br>7.0<br>3.7<br>1.3|
|||in*<br>0.276<br>0.146<br>0.051|
||||



- The dimensions in inches are rounded approximations. 

- Parts with no leads are not solderable and are meant for insertion into magazine clips. 

## Figure G6 — Two Electrode 8mm Product Dimensions 

**==> picture [295 x 113] intentionally omitted <==**

**----- Start of picture text -----**<br>
Axial Leads No Leads<br>(GTCA28-XXXM-R05, R10 & R20) (GTCN28-XXXM-R05, R10 & R20) [†]<br>62.0 ± 4.0<br>(2.441 ± 0.157)<br>ø0.8 0.5<br>(0.032)REF 6.0 ± 0.2 (0.02)REF<br>(0.236 ± 0.008)<br>6.0 ± 0.2<br>(0.236 ± 0.008)<br>ø8.0 ± 0.2<br>(0.315 ± 0.008)<br>ø8.0 ± 0.2<br>(0.315 ± 0.008)<br>**----- End of picture text -----**<br>


**==> picture [154 x 101] intentionally omitted <==**

**----- Start of picture text -----**<br>
Surface-mount<br>(GTCS28-XXXM-R05, R10 & R20)<br>0.5<br>6.0 ± 0.2 (0.02)REF 8.2 ± 0.2<br>(0.236 ± 0.008) (0.323 ± 0.008)<br>ø8.0 ± 0.2 8.2 ± 0.2<br>(0.315 ± 0.008) (0.323 ± 0.008)<br>**----- End of picture text -----**<br>


**Pad Layout - Surface-mount Devices (GTCS28-XXXM-R05, R10 & R20)** 

|Y|Z||
|---|---|---|
|||**X**<br>**Y**<br>**Z**<br>**Nom**<br>**Nom**<br>**Nom**|
|||mm<br>9.0<br>5.6<br>1.2|
|||in*<br>0.354<br>0.22<br>0.047|
||||



- The dimensions in inches are rounded approximations. 

- Parts with no leads are not solderable and are meant for insertion into magazine clips. 

## Figure G7 — Two Electrode 8mm High Voltage Product Dimensions 

**Axial Leads (GTCA28-XXXM-R0X)** 

**==> picture [98 x 69] intentionally omitted <==**

**----- Start of picture text -----**<br>
ø0.8<br>6 ± 0.2<br>62 ± 4<br>ø8 ± 0.2<br>**----- End of picture text -----**<br>


Specifications subject to change without notice. ©2016 Littelfuse, Inc. 

77 

RoHS Compliant, ELV Compliant 

**Gas Discharge Tubes (GDTs)** 

(Cont’d) 

## Figures G3-G11 — Dimensions for Gas Discharge Tubes 

Figure G8 — Three Electrode 5mm Product Dimensions 

**==> picture [330 x 167] intentionally omitted <==**

**----- Start of picture text -----**<br>
Axial Leaded Axial Leaded with-FT<br>(GTCA35-XXXM-R05) (GTCA35-XXXM-R05-FT)<br>11.4 –2.0+0.0 11.4 –2.0+0.0<br>( [0.449 ] +0.000–0.079) ( [0.449 ] +0.000–0.079)<br>7.6 ± 0.2 8.3 ± 0.3<br>(0.299 ± 0.008) (0.327 ± 0.012)<br>7.6 ± 0.2<br>(0.299 ± 0.008)<br>ø5.0 ± 0.2<br>(0.197 ± 0.008)<br>ø5.0 ± 0.2<br>(0.197 ± 0.008)<br>12.0 ± 0.5<br>(0.473 ± 0.020)<br>4.5 13.0 ± 0.5<br>(0.177) REF (0.512 ± 0.020)<br>4.5<br>ø0.8 (0.177) REF<br>3.8 ± 0.3 (0.032)<br>(0.151 ± 0.012) ø0.8<br>3.8 ± 0.3 (0.032)<br>(0.151 ± 0.012)<br>**----- End of picture text -----**<br>


**No Leads (GTCN35-XXXM-R05)[†]** 

**==> picture [84 x 52] intentionally omitted <==**

**----- Start of picture text -----**<br>
ø5.0 ± 0.2<br>(0.197 ± 0.008)<br>7.6 ± 0.2<br>(0.299 ± 0.008)<br>**----- End of picture text -----**<br>


**==> picture [116 x 17] intentionally omitted <==**

**----- Start of picture text -----**<br>
Dimensions in these drawings<br>are in millimeters (inches)<br>**----- End of picture text -----**<br>


**No Leads with-FT Surface-mount (GTCN35-XXXM-R05-FT)[†] (GTCS35-XXXM-R05)** 

**==> picture [304 x 72] intentionally omitted <==**

**----- Start of picture text -----**<br>
8.3 ± 0.3 1.6<br>(0.327 ± 0.012) (0.063)REF<br>ø5.0 ± 0.2 MAX 5.9 ø5.0 ± 0.2<br>(0.197 ± 0.008) (0.232) (0.197 ± 0.008)<br>0.4<br>(0.016) REF<br>ø5.0 ± 0.2<br>7.6 ± 0.2 7.6 ± 0.2 (0.197 ± 0.008)<br>(0.299 ± 0.008) (0.299 ± 0.008)<br>**----- End of picture text -----**<br>


**T Leaded (GTCT35-XXXM-R05)** 

**==> picture [138 x 79] intentionally omitted <==**

**----- Start of picture text -----**<br>
7.6 ± 0.2<br>(0.299 ± 0.008)<br>ø5.0 ± 0.2<br>(0.197 ± 0.008)<br>3X   30.0 ± 2.0<br>ø0.8 (1.182 ± 0.079)<br>(0.032)<br>**----- End of picture text -----**<br>


## **Pad Layout - Surface-mount Devices (GTCS35-XXXM-R05)** 

|X|X||Y1|Y1|Y1|Y2|Y2|2||
|---|---|---|---|---|---|---|---|---|---|
||||||||||**X**<br>**Y1**<br>**Y2**<br>**Z1**<br>**Z2**<br>**Nom**<br>**Nom**<br>**Nom**<br>**Nom**<br>**Nom**|
|||||||||||
||||||||||mm<br>6.0<br>3.6<br>3.6<br>2.5<br>1.3|
||||||||||in*<br>0.236<br>0.142<br>0.142<br>0.098<br>0.051|
|||||||||||
|||||||||||
||||||Z1||Z|||



- The dimensions in inches are rounded approximations. 

- Parts with no leads are not solderable and are meant for insertion into magazine clips. 

Specifications subject to change without notice. ©2016 Littelfuse, Inc. 

78 

RoHS Compliant, ELV Compliant 

**Gas Discharge Tubes (GDTs)** 

(Cont’d) 

## Figures G3-G11 — Dimensions for Gas Discharge Tubes 

## Figure G9 — Three Electrode 6mm Product Dimensions 

**==> picture [488 x 125] intentionally omitted <==**

**----- Start of picture text -----**<br>
Axial Leaded Axial Leaded with-FT No Leads<br>(GTCA36-XXXM-R05 and R10) (GTCA36-XXXM-R05 and R10-FT) (GTCN36-XXXM-R05 and R10) [†]<br>8.0 ± 0.2 8.2 ± 0.3<br>(0.315 ± 0.008) (0.323 ± 0.012) ø6.0 ± 0.2 (0.030) REF0.75<br>(0.236 ± 0.008)<br>ø6.0 ± 0.2<br>(0.236 ± 0.008) ø6.0 ± 0.2<br>12.3 ± 0.5 (0.236 ± 0.008)<br>(0.485 ± 0.020) 13.0 ± 0.5<br>(0.512 ± 0.020)<br>8.0 ± 0.2<br>(0.032) REFø0.8 (0.315 ± 0.008) (0.032) REFø0.8 (0.315 ± 0.008)8.0 ± 0.2<br>4.7 ± 0.5<br>(0.185 ± 0.020) 4.7 ± 0.5 Dimensions in these drawings<br>(0.185 ± 0.020)<br>**----- End of picture text -----**<br>


**Dimensions in these drawings are in millimeters (inches)** 

**==> picture [516 x 260] intentionally omitted <==**

**----- Start of picture text -----**<br>
No Leads with-FT  Radial Leaded Radial Leaded with-FT<br>(GTCN36-XXXM-R05 and R10-FT) [†] (GTCR36-XXXM-R05 and R10) (GTCR36-XXXM-R05 and R10-FT)<br>9.2 ± 0.2<br>8.2 ± 0.3 9.2 ± 0.2 (0.362 ± 0.008)<br>(0.323 ± 0.012) ø6.0 ± 0.2 (0.362 ± 0.008) 8.2 ± 0.3<br>(0.236 ± 0.008) (0.323 ± 0.012) ø6.0 ± 0.2<br>(0.236 ± 0.008)<br>ø6.0 ± 0.2<br>MAX 7.0 (0.236 ± 0.008) MAX 7.0<br>(0.276) 14.0 ± 0.5 (0.276)<br>(0.552 ± 0.020)<br>8.0 ± 0.2<br>(0.315 ± 0.008) (0.032) REFø0.8 8.0 ± 0.5 ø0.8<br>(0.315 ± 0.020) (0.032) REF<br>3.8 ± 0.3<br>(0.150 ± 0.012) 3.8 ± 0.3<br>(0.150 ± 0.012)<br>Surface-mount  Pad Layout - Surface-mount Devices<br>(GTCS36-XXXM-R05 and R10) (GTCS36-XXXM-R05 and R10)<br>1.2 Y1 Y2<br>(0.047) REF ø6.0 ± 0.2<br>(0.236 ± 0.008) X Y1 Y2 Z1 Z2<br>Nom Nom Nom Nom Nom<br>6.0 ± 0.2 X<br>(0.236 ± 0.008) mm 7.0 3.6 3.6 2.5 2.0<br>1.0 in* 0.276 0.142 0.142 0.098 0.079<br>(0.039) REF 6.0 ± 0.2<br>8.2 ± 0.2 (0.236 ± 0.008) Z1 Z2<br>(0.323 ± 0.008)<br>**----- End of picture text -----**<br>


- The dimensions in inches are rounded approximations. 

- Parts with no leads are not solderable and are meant for insertion into magazine clips. 

Figure G10 — Three Electrode 7mm Product Dimensions 

**==> picture [484 x 119] intentionally omitted <==**

**----- Start of picture text -----**<br>
Radial Leaded  Radial Leaded with-FS<br>(GTCR37-XXXM-R10) (GTCR37-XXXM-R10-FS2)<br>11.5 ± 0.5 11.5 ± 0.5 ø7.5 ± 0.2<br>11.5 ± 0.5 (0.453 ± 0.020) (0.453 ± 0.020) (0.296 ± 0.008)<br>(0.453 ± 0.020)<br>ø7.5 ± 0.2<br>ø7.5 ± 0.2 (0.296 ± 0.008)<br>(0.296 ± 0.008)<br>1.5 ø1.0 7.0 ± 0.5 ø1.0 7.0 ± 0.5<br>2.0 (0.059) (0.039) REF (0.276 ± 0.020) (0.039) REF (0.276 ± 0.020)<br>(0.079)<br>4.4 ± 0.3 4.4 ± 0.3<br>(0.173 ± 0.012) (0.173 ± 0.012)<br>**----- End of picture text -----**<br>


† Parts with no leads are not solderable and are meant for insertion into magazine clips. 

Specifications subject to change without notice. ©2016 Littelfuse, Inc. 

79 

RoHS Compliant, ELV Compliant 

**Gas Discharge Tubes (GDTs)** 

(Cont’d) 

## Figures G3-G11 — Dimensions for Gas Discharge Tubes 

## Figure G11 — Three Electrode 8mm Product Dimensions 

**==> picture [505 x 609] intentionally omitted <==**

**----- Start of picture text -----**<br>
Axial Leaded  Axial Leaded with-FS  Axial Leaded with-FS<br>(GTCA38-XXXM-R10) (GTCA38-XXXM-R10-FS) (GTCA38-XXXM-R10-FS2)<br>( [0.528 ] 13.4 –2.0+0.000–0.079+0.0 ) ( [0.528 ] 13.4 –2.0+0.000–0.079+0.0 ) (0.315 ± 0.008)ø8.0 ± 0.2 ( [[0.528 ]] 13.4 –2.0+0.000–0.079+0.0+0.000–0.079+0.0–0.079+0.0) ) ø8.0 ± 0.2<br>8.0 ± 0.2<br>(0.315 ± 0.008) MAX 13.5 MAX 10.8<br>15.0 ± 0.5 (0.489) 18.0 ± 0.5 (0.425) 15.5 ± 0.5<br>+1.5 (0.591 ± 0.020) (0.709 ± 0.020) (0.610 ± 0.020)<br>4.5 –0 +1.5<br>+0.059 +1.5 4.5 –0<br>( [0.177 ] –0.000) 4.5 –0 +0.059–0.000))<br>ø1.0 ( [0.177 ] +0.059–0.000) ( [[0.177 ]] –0.000))<br>(0.039) REF (0.173 ± 0.012)4.4 ± 0.3 (0.039) REFø1.0 4.4 ± 0.3 (0.039) REFø1.0 (0.173 ± 0.012)4.4 ± 0.3<br>(0.173 ± 0.012)<br>Axial Leaded with-FT  No Leads  No Leads with-FT<br>(GTCA38-XXXM-R10-FT) (GTCN38-XXXM-R10) [†] (GTCN38-XXXM-R10-FT) [[†]]<br>+0.0<br>( [0.528 ] 13.4 –2.0+0.000–0.079) (0.394 ± 0.008)10.0 ± 0.2 (0.406 ± 0.012)10.3 ± 0.310.3 ± 0.3 (0.118)3.03.0<br>10.3 ± 0.3 ø8.0 ± 0.2<br>(0.406 ± 0.012) (0.315 ± 0.008) MAX 9.2<br>ø7.2 ± 0.2 8.0 ± 0.2 (0.362)<br>(0.284 ± 0.008) (0.315 ± 0.008)<br>0.5 10.0 ± 0.3 8.0 ± 0.2<br>(0.020) 1.5 (0.394 ± 0.012) (0.315 ± 0.008)<br>4.5 –0+1.5 (0.61115.5+0.000–0.059+0–1.5 ) (0.059)<br>( [0.177 ] +0.059–0.000)<br>ø1.0<br>(0.039) REF 4.4 ± 0.3<br>(0.173 ± 0.012)<br>Radial Leaded  Radial Leaded with-FS  Radial Leaded with-FS<br>(GTCR38-XXXM-R10) (GTCR38-XXXM-R10-FS) (GTCR38-XXXM-R10-FS2)<br>(0.394 ± 0.012)10.0 ± 0.3 (0.394 ± 0.012)10.0 ± 0.3 (0.296 ± 0.008)ø7.5 ± 0.2 (0.394 ± 0.012)10.0 ± 0.3 (0.296 ± 0.008)ø7.5 ± 0.2<br>ø7.5 ± 0.2<br>(0.296 ± 0.008)<br>MAX 17.5<br>7.0 ± 0.5 7.0 ± 0.5 (0.689) 7.0 ± 0.5<br>(0.276 ± 0.020) (0.276 ± 0.020) (0.276 ± 0.020)<br>ø1.0 ø1.0 ø1.0<br>(0.039) REF 4.4 ± 0.3 (0.039) REF 4.4 ± 0.3 (0.039) REF 4.4 ± 0.3<br>(0.173 ± 0.012) (0.173 ± 0.012) (0.173 ± 0.012)<br>Radial Leaded with-FT  Surface-mount<br>(GTCR38-XXXM-R10-FT) (GTCS38-XXXM-R10)<br>10.0 ± 0.3 ø7.5 ± 0.2 10.0 ± 0.3<br>(0.394 ± 0.012) (0.296 ± 0.008) (0.394 ± 0.012) (0.315 ± 0.008)ø8.0 ± 0.2 Dimensions in these drawings<br>are in millimeters (inches)<br>8.0 ± 0.2<br>(0.315 ± 0.008)<br>MAX 16.0<br>(0.630)<br>7.0 ± 0.5 0.5<br>(0.276 ± 0.020) (0.020) 1.5<br>(0.059)<br>ø1.0<br>(0.039) REF 4.4 ± 0.3<br>(0.173 ± 0.012)<br>Pad Layout - Surface-mount Devices<br>(GTCS38-XXXM-R10)<br>Y1 Y2<br>X Y1 Y2 Z1 Z2<br>Nom Nom Nom Nom Nom<br>X mm 9.0 4.65 4.65 2.5 1.5<br>in* 0.354 0.183 0.183 0.098 0.059<br>Z1 Z2<br>**----- End of picture text -----**<br>


**==> picture [172 x 226] intentionally omitted <==**

**----- Start of picture text -----**<br>
Axial Leaded with-FS<br>(GTCA38-XXXM-R10-FS2)<br>+0.0<br>ø8.0 ± 0.2<br>( [[0.528 ]] 13.4 –2.0+0.000–0.079+0.0+0.000–0.079+0.0–0.079+0.0) (0.315 ± 0.008)<br>MAX 10.8<br>(0.425)<br>15.5 ± 0.5<br>(0.610 ± 0.020)<br>+1.5<br>4.5 –0<br>( [[0.177 ]] +0.059–0.000))<br>ø1.0<br>(0.039) REFø1.0 4.4 ± 0.3<br>(0.173 ± 0.012)4.4 ± 0.3<br>No Leads with-FT<br>(GTCN38-XXXM-R10-FT) [[†]]<br>(0.406 ± 0.012)10.3 ± 0.310.3 ± 0.3 (0.118)3.03.0<br>MAX 9.2<br>(0.362)<br>10.0 ± 0.3 8.0 ± 0.2<br>(0.394 ± 0.012) (0.315 ± 0.008)<br>**----- End of picture text -----**<br>


- The dimensions in inches are rounded approximations. 

† Parts with no leads are not solderable and are meant for insertion into magazine clips. 

Specifications subject to change without notice. ©2016 Littelfuse, Inc. 

80 

RoHS Compliant, ELV Compliant 

**Gas Discharge Tubes (GDTs)** 

## Fail-Short Mechanism for Gas Discharge Tubes 

## Fail-Short Mechanism — FS 

The FS fail-short mechanism is a short circuit spring mounted onto a solder pellet  located at the center electrode of the gas tube. Under normal operating conditions, the pellet is positioned to make the spring float above the outer electrodes, as shown in Figure G11 on the previous page.. 

When a prolonged discharge event causes the gas tube temperature to reach the  melting point of the solder, the pellet softens allowing the short circuit spring to  contact with both outer electrodes (Figure G12). This process results in a permanent short circuit  between all three electrodes creating a low resistance path that conducts the fault current to ground without generating a significant amount of heat. 

**==> picture [165 x 110] intentionally omitted <==**

**----- Start of picture text -----**<br>
Figure G12<br>Short Circuit Spring Solder Pellet<br>Outer Electrode Ceramic Tube<br>Center Electrode<br>**----- End of picture text -----**<br>


## Fail-Short Mechanism — FT 

The FT fail-short mechanism is a short circuit spring with a piece of plastic foil spot welded onto the center electrode. Under normal operating conditions, the plastic foil makes the spring insulated from the two outer electrodes. 

When a prolonged discharge event causes the gas tube temperature to reach the  melting point of the plastic foil, the plastic foil melts allowing the short circuit spring to contact both outer electrodes (Figure G13). This process results in a permanent short circuit  between all three electrodes creating a low resistance path that conducts the fault current to ground without generating a significant amount of heat. 

**==> picture [177 x 100] intentionally omitted <==**

**----- Start of picture text -----**<br>
Figure G13<br>Short Circuit Spring Plastic Foil<br>Outer Electrode Ceramic Tube<br>Center Electrode<br>**----- End of picture text -----**<br>


## Operation and Storage Temperatures for Gas Discharge Tubes 

**Operation Temperature Range Storage Temperature Range** Models without Fail-Short Mechanism  : -40°C/+90°C Models with Fail-Short Mechanism : -20°C/+65°C Models with Fail-Short Mechanism 

Models without Fail-Short Mechanism  : -40°C/+90°C Models with Fail-Short Mechanism : -20°C/+65°C 

## Packaging Information for Gas Discharge Tubes 

||**Parts in Bulk**|**Parts in Bulk**|**Parts in Tape and Reel**|**Parts in Tape and Reel**|
|---|---|---|---|---|
|**Part Description**|**Min Order**<br>**Quantity**|**Box**<br>**Quantity**|**Tape and Reel**<br>**Min Order Quantity**|**Box**<br>**Quantity**|
|3mm 2Pole Surface-mount|—|—|2000|16000|
|5mm 2Pole No leads|5000|20000|—|—|
|5mm 2Pole Leads|1000|5000|—|—|
|5mm 2Pole Surface-mount|—|—|1500|12000|
|6mm 2Pole No leads|2000|10000|—|—|
|6mm 2Pole Leads|1000|5000|—|—|
|6mm 2Pole Surface-mount|—|—|750|6000|
|8mm 2pole No leads|2000|10000|—|—|
|8mm 2Pole Leads|1000|5000|—|—|
|8mm 2Pole Surface-mount|—|—|500|4000|
|5mm 3Pole No leads|2500|10000|—|—|
|5mm 3Pole Leads|1000|5000|—|—|
|5mm 3Pole Surface-mount|—|—|1000|8000|
|6mm 3Pole No leads|2500|10000|—|—|
|6mm 3Pole Leads|1000|5000|—|—|
|6mm 3Pole Surface-mount|—|—|750|4500|
|7mm 3Pole Leads|1000|5000|—|—|
|8mm 3Pole No leads|1000|5000|—|—|
|8mm 3Pole Leads|1000|5000|—|—|
|8mm 3Pole Surface-mount|—|—|500|2500|



Specifications subject to change without notice. ©2016 Littelfuse, Inc. 

81 

RoHS Compliant, ELV Compliant 

**Gas Discharge Tubes (GDTs)** 

## Installation for Gas Discharge Tubes 

Care should be taken when installing GDTs equipped with fail-short mechanisms into arrester magazines, printed circuit boards, etc. Too much downward pressure may force the short circuit spring through the thin insulation tube creating a shorted condition. 

## Solder Reflow Recommendations for Surface-mount GDT Devices 

Surface-mount GDTs can be soldered using standard Pb-free reflow profiles. 

## Table G4 — Tape and Reel Specifications 

|**Tape Dimension**<br>**EIA Mark**|**3mm devices (2 pole)**<br>**Dimension (mm)**|**5mm devices (2 pole)**<br>**Dimension (mm)**|**6mm devices (2 pole)**<br>**Dimension (mm)**|**8mm devices (2 pole)**<br>**Dimension (mm)**|
|---|---|---|---|---|
|A0|3.40±0.10|4.9±0.10|6.70±0.10|8.60±0.10|
|B0|5.00±0.10|5.5±0.10|4.60±0.10|6.40±0.10|
|D0|1.50+0.10/-0|1.50+0.10/-0|1.50+0.10/-0|1.50+0.10/-0|
|D1|—|1.5 MIN|—|—|
|E1|1.75±0.10|1.75±0.10|1.75±0.10|1.75±0.10|
|E2|14.25±0.30|14.25±0.30|14.25±0.30|14.25±0.30|
|F|7.50±0.10|7.50±0.10|7.50±0.10|7.50±0.10|
|P0|4.00±0.10|4.00±0.10|4.00±0.10|4.00±0.10|
|P1|8.00±0.10|8.00±0.10|12.00±0.10|12.00±0.10|
|P2|2.00±0.10|2.00±0.10|2.00±0.10|2.00±0.10|
|W|16.00±0.30|16.00±0.30|16.00±0.30|16.00±0.30|
|**TapeThickness**<br>**EIA Mark**|**Dimension (mm)**|**Dimension (mm)**|**Dimension (mm)**|**Dimension (mm)**|
|B1|—|—|—|—|
|K0|3.30±0.10|5.30±0.10|6.50±0.10|8.50±0.10|
|T|0.35±0.05|0.40±0.05|0.35±0.05|0.50±0.05|
|T1|—|—|—|—|
|T2|—|—|—|—|
|**Reel Dimension**<br>**EIA Mark**|**Dimension (mm)**|**Dimension (mm)**|**Dimension (mm)**|**Dimension (mm)**|
|A|330|330|330|330|
|B|2.20±0.50|2.20±0.50|2.20±0.50|2.20±0.50|
|C|13.00±0.20|13.00±0.20|13.00±0.20|13.00±0.20|
|D|20.20±1.00|20.20±1.00|20.20±1.00|20.20±1.00|
|N|100.00±1.00|100.00±1.00|100.00±1.00|100.00±1.00|
|W1|16.50±0.10|16.50±0.10|16.50±0.10|16.50±0.10|
|W2|21.10±02.00|21.10±02.00|21.10±02.00|21.10±02.00|



## Figure G14 — EIA Referenced Taped Component Dimensions 

**==> picture [330 x 161] intentionally omitted <==**

**----- Start of picture text -----**<br>
TT2 øD0 P2 P 0 [10 pitches cumulative tolerance on tape ±0.2mm]<br>E1<br>A0 F<br>W<br>K0 E2<br>B1 B0<br>T1 Cover Tape Center Lines of Cavity P1 øD1 Embossment<br>B1 is for tape feeder reference only,<br>including draft concentric about B0 User Direction of Unreeling<br>**----- End of picture text -----**<br>


Specifications subject to change without notice. ©2016 Littelfuse, Inc. 

82 

RoHS Compliant, ELV Compliant 

**Gas Discharge Tubes (GDTs)** 

## Table G5 — Tape and Reel Specifications 

|**Tape Dimension**<br>**EIA Mark**|**5mm devices (3 pole)**<br>**Dimension (mm)**|**6mm devices (3 pole)**<br>**Dimension (mm)**|**8mm devices (3 pole)**<br>**Dimension (mm)**|
|---|---|---|---|
|A0|5.40±0.10|6.50±0.10|8.50±0.10|
|B0|8.00±0.10|8.60±0.10|10.60±0.10|
|D0|1.50+0.10/-0|1.50+0.10/-0|1.50+0.10/-0|
|D1|1.50(min)|1.50(min)|—|
|E1|1.75±0.10|1.75±0.10|1.75±0.10|
|E2|14.25±0.30|22.25±0.30|22.25±0.30|
|F|7.50±0.10|11.50±0.10|11.50±0.10|
|P0|4.00±0.10|4.00±0.10|4.00±0.10|
|P1|8.00±0.10|12.00±0.10|16.00±0.10|
|P2|2.00±0.10|2.00±0.10|2.00±0.10|
|W|16.00±0.30|24.00±0.30|24.00±0.30|
|**TapeThickness**<br>**EIA Mark**|**Dimension (mm)**|**Dimension (mm)**|**Dimension (mm)**|
|B1|—|—|—|
|K0|5.70±0.10|6.30±0.10|8.40±0.10|
|T|0.50±0.05|0.50±0.05|0.50±0.05|
|T1|—|—|—|
|T2|—|—|—|
|**Reel Dimension**<br>**EIA Mark**|**Dimension (mm)**|**Dimension (mm)**|**Dimension (mm)**|
|A|330|330|330|
|B|2.20±0.50|2.20±0.50|2.20±0.50|
|C|13.00±0.20|13.00±0.20|13.00±0.20|
|D|20.20±1.00|20.20±1.00|20.20±1.00|
|N|100.00±1.00|100.00±1.00|100.00±1.00|
|W1|16.50±0.10|24.50±0.10|24.50±0.10|
|W2|21.10±02.00|29.10±02.00|29.10±02.00|
|W3|—|—|—|



## Figure G15 — EIA Referenced Reel Dimensions 

**==> picture [381 x 139] intentionally omitted <==**

**----- Start of picture text -----**<br>
Full Radius<br>Access Hole at Slot Location W3 (Includes Flange Distortion at Outer Edge)<br>(ø40mm min.)<br>W2 (Measured at Hub)<br>A D C N (Hub Diameter,<br>Maximum Weight of Reel and Contents = 13.6kg)<br>(Arbor Hole Diameter)<br>W1 (Measured at Hub)<br>If Present,<br>Tape Slot in Core<br>B for Tape Start:<br>4.5 ± 0.05 Width x 10.0mm (min) Depth<br>**----- End of picture text -----**<br>


Specifications subject to change without notice. ©2016 Littelfuse, Inc. 

83 

RoHS Compliant, ELV Compliant 

**Gas Discharge Tubes (GDTs)** 

## Part Numbering System for Gas Discharge Tubes 

## Example Part Number 

**==> picture [349 x 330] intentionally omitted <==**

**----- Start of picture text -----**<br>
GT   C   S   2   3 - 231   M - R   01 - FS - 2<br>Packaging<br>2 = Tape and Reel<br>Nothing = Tray Packaging<br>FS   = Solder Pellet Fail Short Mechanism on Top<br>FS2 = Solder Pellet Fail Short Mechanism on Bottom<br>FT   = Plastic Fail Short Mechanism on Top<br>Surge Rating<br>01 = 8x20µs 1kA, 10 Hits<br>02 = 8x20µs 2.5kA, 10 Hits<br>05 = 8x20µs 5kA, 10 Hits<br>10 = 8x20µs 10kA, 10 Hits<br>20 = 8x20µs 20kA, 10 Hits<br>Product Family Designator<br>R = R Series<br>Tolerance of 20% on DC Switch Voltage<br>DC Switch Voltage of 230V<br>23  x 10* 1  = 230V,   23  x 10* 2  = 2300V<br>Diameter<br>3 = 3mm<br>5 = 5mm<br>6 = 6mm<br>7 = 7.5mm<br>8 = 8mm<br>Number of Electrodes (2, 3)<br>Lead Configuration<br>A = Axial Leads<br>C = Chip Type<br>N = No Leads<br>R = Radial Leads<br>S = Surface-Mount<br>T = T-Shape Leads<br>Ceramic<br>Gas Tube<br>**----- End of picture text -----**<br>


**NOTE:** GTCS23-XXXM-R01 and GTCC23-XXXM-R01 parts available only in surface-mount and tape and reel packaging. 

## Marking Reference Guide — Example 

**352   R   05   GN** 

**==> picture [142 x 94] intentionally omitted <==**

**----- Start of picture text -----**<br>
Year and Week of Manufacture<br>G = First Half of 2004<br>N = Week 14<br>Per Manufacturer’s Lot Number System<br>8x20µs 10 Hits Surge Current (05=5kA)<br>Product Family Designator<br>R = R Series<br>Voltage Designator (35 = 350V,  352=3500V)<br>Manufacturer’s Mark<br>**----- End of picture text -----**<br>


**NOTES:** GTCS23-XXXM-R01 and GTCC23-XXXM-R01 parts will have no marking. Devices with no leads (GTCNxx-xxxx-xx) are not able to be soldered as their electrodes are nickel plated. They should be installed by insertion into a magazine clip. 

## **Notice:** 

Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation.  Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation.  Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation.  The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. 

Specifications subject to change without notice. ©2016 Littelfuse, Inc. 

84 

RoHS Compliant, ELV Compliant
Updated at June 3, 2026
Founded in 1927 and headquartered in Chicago, Illinois, Littelfuse is a premier global manufacturer of circuit protection, power control, and sensing technologies. Widely recognized for pioneering the first small, fast-acting protective fuse, the company has grown into an industry leader whose highly reliable components are essential to modern industrial, transportation, and consumer electronics applications worldwide. At the core of the Littelfuse portfolio is an expansive and industry-leading range of circuit protection solutions. This encompasses a massive selection of traditional fuses, fuse holders, and resettable PTC thermistor fuses designed to safely interrupt overcurrent conditions. To defend against electrical overstress, Littelfuse also provides advanced transient voltage suppression (TVS) technologies, including thousands of specialized TVS diodes, TVS varistors, and gas discharge tubes (GDTs) that ensure robust defense against voltage spikes and environmental hazards. Beyond its foundational protection components, Littelfuse manufactures a diverse array of discrete semiconductors, sensors, and switching devices. Engineers rely on their high-performance thyristors, including TRIACs and SCRs, alongside power-efficient Schottky diodes and MOSFETs for demanding power control applications. Complemented by precision proximity sensors and highly reliable reed and solid-state relays, Littelfuse delivers the critical building blocks required for secure, efficient, and complete system design.
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