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SL1021A260R
Gas Discharge Tube (GDT), Low Capacitance, SL1021A Series, 260 V, 3 Terminal Through Hole, 10 kA
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- Manufacturer: LITTELFUSE
- Product type: Gas Discharge Tubes - GDT
- Product Range:SL1021 Series; DC Breakover Voltage:260V; GDT Case Style:3 Terminal Through Hole; Impulse Discharge Current:10kA; Impulse Sparkover Voltage:550V; Body Diameter:8.25mm; Breakdown Vo
- SVHC: No SVHC (17-Dec-2014)
- Product Range: SL1021A Series
- GDT Case Style: 3 Terminal Through Hole
- DC Breakover Voltage: 260V
- Impulse Discharge Current: 10kA
- Impulse Sparkover Voltage: 550V
| Delivery and price | |
|---|---|
| Units per pack | 500 |
| Price | 1.46 € |
| Current stock | 500+ |
| Lead time | 30 days |
Datasheet
Gas Discharge Tubes **Datasheet** **SL1021A/B Series** Gas Discharge Tubes ## **RoHS** [| | @ SAY ## **Description** GDT circuit protection devices dissipate electrical surge energy safely within a contained plasma gas. Commonly used to help protect sensitive telecom and networking equipment and lines, GDTs protect from damage that may result from lightning strikes and equipment switching operations. The Littelfuse GDT series described in this document are available in a variety of leaded and surface mount forms and offered with and without optional fail-safe clip. Please refer to the electrical specifications, dimension and packaging options section of this document for additional information. ## **SL1021A/B Series:** SL1021A/B series GDTs are designed to offer high levels of performance on fast rising transients in the range of 100V/μS to 1KV/μS, which are those most likely created by induced lightning disturbances. ## **Additional Information** These devices feature ultra low capacitance (typically 1.5pF or less) and are extremely robust with SL1021A devices able to divert a 10,000 Amp pulse without destruction, and SL1021B suffix devices able to divert a 20,000 Amp pulse without destruction. These series offer optimized internal geometry which provide low insertion loss at high frequencies, ideal for the protection of broadband and other high speed transmission equipment. **==> picture [198 x 96] intentionally omitted <==** **----- Start of picture text -----**<br> Resources Accessories Samples<br>SL1021A SL1021A SL1021A<br>“oa &<br>Resources Accessories Samples<br>SL1021B SL1021B SL1021B<br>**----- End of picture text -----**<br> ## **Agency Approvals** |**Agency**|**Agency File Number**| |---|---| ||E128662| ## **3 Electrode GDT Graphical Symbol** **==> picture [170 x 54] intentionally omitted <==** **----- Start of picture text -----**<br> a b a = TIP<br>b = RING<br>e = GROUND<br>(center electrode)<br>e<br>**----- End of picture text -----**<br> ## **Features** - RoHS compliant - Low insertion loss - Excellent response to fast rising transients - Ultra low capacitance - 10KA (A suffix devices) / 20KA (B suffix devices) surge capability tested with 8/20μs pulse as defined by IEC 61000-4-5 ## **Applications** ## **SL1021:** - Broadband equipment - ADSL equipment - XDSL equipment - Satellite and CATV equipment - Splitters - Available with thermal failsafe option (add ‘F’ suffix to part number) - General telecom equipment - Telecom network interfaces - Telephone line cards - Repeaters - Modems - Line test equipment © 2022 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 01/26/22 **1** Gas Discharge Tubes **Datasheet** **SL1021A/B Series** Gas Discharge Tubes **==> picture [46 x 52] intentionally omitted <==** **==> picture [311 x 52] intentionally omitted <==** ## **Product Characteristics** |**Materials**|Dull Tin Plate 17.5 ± 12.5 Microns.<br>with ceramic insulator| |---|---| |**Product Marking**|‘LF’ mark, voltage& date code:<br>SL1021A**- Red**/White text<br>SL1021B **- Blue**/White text| |**Glow to arc**<br>**transition current**|~ 1Amp| |**Glow Voltage**|~60-200 Volts| |**Storage and Operation**<br>**Temperature**|-40 to +90°C| |**Transverse Voltage (Delay**<br>**Time)**|< 0.2µSec (Tested to ITU-T Rec. K.12)| |**Arc Voltage**|~10 to 35 Volts| |**Holdover Voltage**|<150mS (Tested to ITU-T Rec. K.12)| ## **Electrical Characteristics** **==> picture [506 x 313] intentionally omitted <==** **----- Start of picture text -----**<br> Device Specifications (at 25°C) Life Ratings<br>Part Number DC Voltage100V/Sec. DC Voltage VoltageDC Capaci-tance ResistanceInsulation AC Current50Hz 1Sec. CurrentSurge Max Single Surge Max Single Surge Surge Life10/1000<br>MIN TYP MAX 100 V/μSec. 1kV/μSec. (@1Mhz) MIN x10 [1] 8/20μSecx10 [1] 8/20μSec [1] 10/350μSec [1] μSecx300 [1]<br>SL1021B075 60 75 90<br>650 >10 [10] Ω 4kA [2]<br>SL1021A090<br>72 90 108 (at 50V) 5kA [3]<br>SL1021B090<br>SL1021A145<br>116 145 174<br>SL1021B145 500<br>SL1021A150 120 150 180 600<br>SL1021B150<br>SL1021A200 150 200 250<br>SL1021A230<br>184 230 276 450<br>SL1021B230<br>650<br>SL1021A250<br>200 250 300 500<br>SL1021B250<br>SL1021A260SL1021B260 210 260 310 550 700 <1.5pF 10Amps 20kA10kA [2][3] 25kA15kA [2][3] 200Amps<br>SL1021A300 >10 [10] Ω 2.5kA [2]<br>240 300 360 650 850<br>SL1021B300 (at 100V) 5kA [3]<br>SL1021A350<br>280 350 420 700 900<br>SL1021B350<br>SL1021A400<br>320 400 480<br>SL1021B400<br>850 950<br>SL1021A420<br>345 420 500<br>SL1021B420<br>SL1021A450<br>360 450 540 900 1000<br>SL1021B450<br>SL1021A500<br>400 500 600 950 1100<br>SL1021B500<br>SL1021A600 480 600 720 1000 1200<br>**----- End of picture text -----**<br> ## **Notes:** 1. Total current through centre electrode, tested in accordance with ITU-T Rec K.12 2. SL1021A series 3. SL1021B series © 2022 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 01/26/22 **2** Gas Discharge Tubes **Datasheet** **SL1021A/B Series** Gas Discharge Tubes **==> picture [46 x 52] intentionally omitted <==** ## **Time vs. Current for Failsafe** **==> picture [243 x 164] intentionally omitted <==** **----- Start of picture text -----**<br> 60<br>SL102xA with Failsafe<br>30 SL102xB or PMT8 500 Volt Higher Melting Point Solder<br>SL102xB or PMT8 350 Volt Higher Melting Point Solder<br>20 SL102xB or PMT8 90 Volt Higher Melting Point Solder<br>15<br>14<br>13<br>12<br>11<br>10<br>9<br>8<br>7<br>6<br>5<br>4<br>3<br>2<br>1<br>0.5 1 2 5 10 15 30<br>**----- End of picture text -----**<br> **==> picture [311 x 52] intentionally omitted <==** ## **Voltage vs. Time Characteristic** **==> picture [243 x 164] intentionally omitted <==** **----- Start of picture text -----**<br> Max dynamic breakover<br>voltage<br>Hold-over voltage<br>On-State voltage<br>0 200 400 600 800 1000 1200<br>Time (ns)<br>(V)<br>Voltage<br>**----- End of picture text -----**<br> ## **Soldering Parameters - Reflow Soldering** (Surface Mount Devices) |**Refow Condition**|**Refow Condition**|Pb – Free assembly| |---|---|---| |**Pre Heat**|**- Temperature Min (Ts(min))**|150°C| ||**- Temperature Max (Ts(max))**|200°C| ||**- Time (Min to Max) (ts)**|60 – 180 secs| |**Average ram**<br>**peak**|**p up rate (Liquidus Temp (TL) to**|3°C/second max| |**TS(max) to TL -**|**Ramp-up Rate**|5°C/second max| |**Refow**|**- Temperature (TL) (Liquidus)**|217°C| ||**- Temperature (tL)**|60 – 150 seconds| |**Peak Temperature (TP)**||260+0/-5°C| |**Time within 5°C of actual peak Temperature (tp)**||10 – 30 seconds| |**Ramp-down Rate**||6°C/second max| |**Time 25°C to peak Temperature (TP)**||8 minutes Max.| |**Do not exceed**||260°C| **==> picture [243 x 164] intentionally omitted <==** **----- Start of picture text -----**<br> t P<br>T P<br>Critical Zone<br>Ramp-up TL to TP<br>T L<br>T S(max) t L<br>Ramp-down<br>Preheat<br>T S(min)<br>t S<br>25<br>time to peak temperature Time<br>(t 25ºC to peak)<br>Temperature<br>**----- End of picture text -----**<br> **Soldering Parameters - Hand Soldering** Solder Iron Temperature: 350° C +/- 5°C Heating Time: 5 seconds max. ## **Soldering Parameters - Wave Soldering** (Thru-Hole Devices) **==> picture [245 x 164] intentionally omitted <==** **----- Start of picture text -----**<br> 300<br>280<br>260<br>240<br>220<br>200<br>180<br>160<br>140<br>120<br>100<br>80<br>60<br>40<br>20<br>0<br>Time (Seconds)<br>Preheat Time Cooling Time<br>Dwell Time<br>Temperature (°C) - Measured on bottom side of board 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240<br>**----- End of picture text -----**<br> ## **Recommended Process Parameters:** **==> picture [244 x 101] intentionally omitted <==** **----- Start of picture text -----**<br> Wave Parameter Lead-Free Recommendation<br>Preheat:<br>(Depends on Flux Activation Temperature) (Typical Industry Recommendation)<br> Temperature Minimum: 100° C<br> Temperature Maximum: 150° C<br> Preheat Time: 60-180 seconds<br>Solder Pot Temperature: 280° C Maximum<br>Solder Dwell Time: 2-5 seconds<br>**----- End of picture text -----**<br> **Note:** Surge Arrestors with a Failsafe mechanism should be individually examined after soldering © 2022 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 01/26/22 **3** Gas Discharge Tubes **Datasheet** **SL1021A/B Serie** ~~**s**~~ Gas Discharge Tubes ~~eee~~ ## **Device Dimensions** **Note:** Failsafe option dimensions shown in green. **Shaped Radial Leaded Devices:** **==> picture [202 x 128] intentionally omitted <==** **----- Start of picture text -----**<br> 12.4 ± 1<br>[0.488 ± 0.039] Mounting Area<br>Type 04 / R [0.464]11.8 [0.354] 9.0<br>10.10 8.1.<br>[0.398] [0.319]<br>0.3mm<br>Minimum<br>Gap<br>9.9<br>[0.354]<br>15<br>[0.590]<br>16.8 1.0 DIA.<br>4.4 [0.661] [0.039]<br>[0.173]<br>4.4± 0.3 4.4± 0.3<br>[0.173± 0.12] [0.173± 0.12]<br>**----- End of picture text -----**<br> ## **Core Devices:** **==> picture [186 x 56] intentionally omitted <==** **----- Start of picture text -----**<br> Type 01 / C [0.464][0.398]10.1011.8 Mounting Area[0.354][0.319]9.08.1<br>0.3mm<br>Minimum<br>Gap<br>9.9<br>[0.354]<br>**----- End of picture text -----**<br> ## ~~**Straigh**~~ **t Radial Le** ~~**a**~~ **ded Devices:** **==> picture [202 x 128] intentionally omitted <==** **----- Start of picture text -----**<br> 12.4 ± 1<br>[0.488 ± 0.039] Mounting Area<br>Type 05 / P [0.464]11.8 [0.354]9.0<br>10.10 8.1.<br>[0.398] [0.319]<br>0.3mm<br>Minimum<br>Gap<br>9.9<br>[0.354]<br>15<br>[0.590]<br>16.8 1.0 DIA.<br>4.4 [0.661] [0.039]<br>[0.173]<br>5.5± 0.3 5.5± 0.3<br>[0.216± 0.12] [0.216± 0.12]<br>**----- End of picture text -----**<br> **==> picture [202 x 132] intentionally omitted <==** **----- Start of picture text -----**<br> 14.7<br>[0.579]<br>Type 06 / Y [0.464]11.8 Mounting Area[0.354]9.0<br>[0.398]10.10 8.1 DIA. MAX.[0.319]<br>0.3mm<br>Minimum<br>Gap<br>9.9<br>[0.354]<br>15<br>[0.590]<br>16.8[0.661] 1.0 DIA.[0.039]<br>6.35 ± 0.5 6.35 ± 0.5<br>[0.25 ± 0.25] [0.25 ± 0.25]<br>**----- End of picture text -----**<br> ## **Straight "T" Leaded Devices:** **Type 14 / X** **==> picture [197 x 129] intentionally omitted <==** **----- Start of picture text -----**<br> 50 ± 3<br>[1.968 ± 0.118 ]<br>[0.464]11.8 Mounting Area[0.354]9.0<br>10.10<br>[0.398] 8.1 DIA. MAX.<br>[0.319]<br>0.3mm<br>Minimum<br>Gap<br>23.8<br>[0.937]<br>22<br>[0.866] 1.0 DIA..<br>[0.039]<br>sah;<br>**----- End of picture text -----**<br> © 2022 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 01/26/22 **4** Gas Discharge Tubes **Datasheet** **SL1021A/B Series** Gas Discharge Tubes **Part Numbering System and Ordering Information** ## **Packaging** **==> picture [457 x 205] intentionally omitted <==** **----- Start of picture text -----**<br> SL102x x xxx x x PMT8 xxx x x For 'SL1021A/B' device type C, R, P, Y packing<br>Series tl Series ne Lg<br>SL1021 PMT8<br>SL1024<br>Surge Capability Box (Cardboard)<br>A = 10kA<br>B = 20kA Tray, Cover (PET)<br>Breakdown Voltage 090 = 90V 300 = 300V Breakdown Voltage 090 = 90V ——— Tray, Bottom (PET)for 100 Pcs.<br>145 = 145V 350 = 350V 230 = 230V PE Form<br>150 = 150V 400 = 400V | 250 = 250V =<br>200 = 200V 420 = 420V 350 = 350V<br>230 = 230V 450 = 450V 400 = 400V<br>250 = 250V 500 = 500V<br>260 = 260V 600 = 600V<br>Configuration Code Configuration Code<br>(See Device Dimensions section) (See Device Dimensions section) For 'SL1021A/B' device type X packing<br>C Y 01 10<br>R X 04 14<br>P 05 60 “g<br>06<br>Option Code Option Code<br>Blank = No failsafe Blank = No Failsafe Box (Cardboard)<br>F or G = With Failsafe F = With Failsafe<br>~235<br>~258<br>~55<br>**----- End of picture text -----**<br> **==> picture [146 x 97] intentionally omitted <==** **----- Start of picture text -----**<br> “g<br>Box (Cardboard)<br>Tray (PET)<br>for 50 Pcs.<br>Sponge (PE Form)<br>~135<br>ae<br>~258<br>~58<br>**----- End of picture text -----**<br> |**Device Type**<br>Type C|**Device Type**<br>Type C|**Description**<br>100pcs/tray x 5 trays per carton|**Quantity**<br>500| |---|---|---|---| |~~T~~ype R||100pcs/tray x 5 trays per carton|500| ||Type P|100pcs/tray x 5 trays per carton|500| ||Type Y|100pcs/tray x 5 trays per carton|500| ||Type X|50pcs/tray x 5 trays per carton|250| |* P~~lease~~|~~lease~~contact the factory for further packaging information.||| - P ~~lease~~ contact the factory for further packaging information. **Disclaimer Notice** - Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each product selected for their own applications. Littelfuse products are not designed for, and may not be used in, all applications. Read complete Disclaimer Notice at: www.littelfuse.com/disclaimer-electronics. © 2022 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 01/26/22 **5**
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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