RUSBF120

PTC **Datasheet** 

**RUSBF Series** Radial Leaded 

## RoHS HFL_1@ AVG A 

## **Description** 

Littelfuse PolySwitch radial-leaded devices represent the most comprehensive and complete set of PPTC products available in the industry today. RUSBF series is for fast time-to-trip and lowresistance computer applications. 

## **Features & Benefits** 

- Resettable and single-use overcurrent devices 

- Wide range of form factor and termination methods 

- Devices compatible with high-volume electronics assembly 

- RoHS compliant, Lead-Free and Halogen-Free 

## **Applications** 

## **Additional Information** 

- Satellite video receivers ■ CD-ROMs 

- Industrial controls ■ Game machines 

- Transformers ■ Battery packs 

- Computer motherboards ■ Phones 

- Modems ■ Fax machines 

- USB hubs, ports and ■ Analog and digital line cards peripherals ■ Printers 

**Resources** 

**Accessories** 

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- IEEE 1394 ports 

## **Agency Approvals** 

|**Agency**|**Agency File Number**|
|---|---|
|Ww|E74889|
|6.|78165|
|A|72161784|



## **Electrical Characteristics** 

|**Part**|**Ordering Part**|**IH**|**IT**|**VMAX**|**VMAX**|**IMAX**|**IMAX**|**PD Typ**|**Max Time-to-trip**|**Max Time-to-trip**|**RMIN**|**RMAX**|**R1MAX**|**Lead Size**|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|**Number**|**Number**|**(A)**|**(A)**|**(VDC)**|**(VAC RMS)**|**(DCADC)**|**(ACARMS)**|**(W)**|**(A)**|**(s)**|**(Ω)**|**(Ω)**|**(Ω)**|**(mm**<br>**2/AWG)**|
|||||||**RUSBF – 6V**|||||||||
|RUSBF075|RF3379-000|0.75|1.30|6|—|40|—|0.3|8.0|0.4|0.110|0.1750|0.23|0.205/24|
|RUSBF120|RF3386-000|1.20|2.00|6|—|40|—|0.6|8.0|0.5|0.070|0.0975|0.14|0.205/24|
|RUSBF155|RF3391-000|1.55|2.65|6|—|40|—|0.6|7.8|2.2|0.040|0.0705|0.10|0.205/24|
|||||||**RUSBF – 16V**|||||||||
|RUSBF090|RF3382-000|0.90|1.8|16|—|40|—|0.6|8.0|1.2|0.070|0.120|0.180|0.205/24|
|RUSBF110|RF3384-000|1.10|2.2|16|—|40|—|0.7|8.0|2.3|0.050|0.095|0.140|0.205/24|
|RUSBF135|RF3388-000|1.35|2.7|16|—|40|—|0.8|8.0|4.5|0.040|0.074|0.112|0.205/24|
|RUSBF160|RF3394-000|1.60|3.2|16|—|40|—|0.9|8.0|9.0|0.030|0.061|0.110|0.205/24|
|RUSBF185|RF3212-000|1.85|3.7|16|—|40|—|1.0|8.0|10.0|0.030|0.051|0.090|0.205/24|
|RUSBF250|RF3398-000|2.50|5.0|16|—|40|—|1.2|8.0|40.0|0.020|0.036|0.060|0.205/24|



## **Notes:** 

IH : Hold current: maximum current device will pass without interruption in 20°C still air. 

IT : Trip current: minimum current that will switch the device from low resistance to high resistance in 20°C still air. 

- VMAX : Maximum continuous voltage device can withstand without damage at rated current. 

IMAX : Maximum fault current device can withstand without damage at rated voltage. PD : Power dissipated from device when in the tripped state in 20°C still air. 

RMIN : Minimum resistance of device as supplied at 20°C unless otherwise specified. 

RMAX : Maximum resistance of device as supplied at 20°C unless otherwise specified. 

- R1MAX : Maximum resistance of device when measured one hour post reflow (surface-mount device) or one hour post trip  (radial-leaded device) at 20°C unless otherwise specified. 

- Electrical characteristics determined at 25°C. 

© 2022 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 10/26/22 

**1** 

PTC **Datasheet** 

**RUSBF Series** Radial Leaded 

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## **Temperature Rerating** 

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Maximum Ambient Temperature<br>-40°C  -20°C  0°C  20°C   25°C  40°C 50°C 60°C 70°C 85°C<br>Hold Current (A)<br>RUSBF – 6V<br>RUSBF075 1.05 0.95 0.85 0.75 0.73 0.65 0.60 0.55 0.50 0.43<br>RUSBF120 1.69 1.52 1.36 1.20 1.16 1.04 0.96 0.88 0.80 0.68<br>RUSBF155 2.17 1.96 1.75 1.55 1.50 1.34 1.24 1.14 1.03 0.88<br>RUSBF – 16V<br>RUSBF090 1.31 1.17 1.04 0.90 0.87 0.75 0.69 0.61 0.55 0.47<br>RUSBF110 1.60 1.43 1.27 1.10 1.07 1.00 0.92 0.75 0.67 0.57<br>RUSBF135 1.96 1.76 1.55 1.35 1.31 1.12 1.04 0.92 0.82 0.70<br>RUSBF160 2.32 2.08 1.84 1.60 1.55 1.33 1.23 1.09 0.98 0.83<br>RUSBF185 2.68 2.41 2.13 1.85 1.79 1.54 1.42 1.26 1.13 0.96<br>RUSBF250 3.63 3.25 2.88 2.50 2.43 2.08 1.93 1.70 1.53 1.30<br>**----- End of picture text -----**<br>


## **Temperature Rerating Curve** 

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A =  RUSBF075, 200<br>RUSBF120,<br>RUSBF155<br>B =  all other RUSBF 150 B<br>A<br>100<br>A<br>50<br>B<br>0<br>-40 -20 0 20 40 60 80<br>Ambient Temperature (˚C)<br>% of Rated Hold and Trip Current<br>**----- End of picture text -----**<br>


© 2022 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 10/26/22 

**2** 

PTC **Datasheet** 

**RUSBF Series** Radial Leaded 

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## **Typical Time-to-Trip Curves at 20°C** 

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RUSBF<br>100 C D E FG H I<br>A =  RUSBF075<br>B =  RUSBF090 B<br>A<br>C =  RUSBF110 10<br>D =  RUSBF120<br>E =  RUSBF135<br>F =  RUSBF155 1<br>G =  RUSBF160 I<br>H<br>H =  RUSBF185<br>0.1 G<br>I  =  RUSBF250<br>F<br>E<br>0.01 D<br>A B [C]<br>0.001<br>1 10 100<br>Fault Current (A)<br>Physical Specifications<br>RUSBF075: Tin-plated Nickel-copper Alloy, 0.205mm [2]  (24AWG), ø0.51mm/0.020in<br>Lead Material<br>RUSBF090 to RUSBF250: Tin-plated Copper-clad Steel, 0.205mm [2]  (24AWG), ø0.51mm/0.020in<br>Solderability per ANSI/J-STD-002 Category 3 Except<br>Soldering Characteristics<br>RUSBF075 Meet ANSI/J-STD-002 Category 1<br>RUSBF120: per IEC 60068-2-20, Test Tb, Method 1; Can withstand 5s at 260°C ±5°C<br>Solder Heat Withstand<br>All Others : per IEC 60068-2-20, Test Tb, Method 1; Can withstand 10s at 260°C ±5°C<br>Insulating Material Cured, Flame-retardant Epoxy Polymer; Meets UL 94V-0<br>Operation Temperature -40°C~85°C<br>Time-to-Trip (s)<br>**----- End of picture text -----**<br>


**Note:** Devices are not designed to be placed through a reflow process. 

## **Environmental Specifications** 

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Test Conditions Resistance Change<br>70°C, 1000 hrs ±5%<br>Passive Aging<br>85°C, 1000 hrs ±5%<br>Humidity Aging 85°C, 85% R.H., 1000 hrs ±5%<br>Thermal Shock 85°C, -40°C (10 Times) ±5%<br>Solvent Resistance MIL-STD-202, Method 215F No change<br>Moisture Resistance Level Level 1, J-STD-020<br>40°C max, 70% RH max; devices should remain in original sealed bags prior to use.<br>Storage Conditions  Devices may not meet specified values if these storage conditions are exceeded.<br>**----- End of picture text -----**<br>


© 2022 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 10/26/22 

**3** 

PTC **Datasheet** 

**RUSBF Series** Radial Leaded 

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**Dimension Figures** 

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A E A E<br>B<br>B A<br>C<br>J<br>J E H<br>D<br>D<br>C F C F Figure 3 Figure 4<br>CL to CL CL CL CL to CL CL CL<br>**----- End of picture text -----**<br>


**Figure 1** 

**Figure 2** 

**Dimensions and Weights** 

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Dimensions in Millimeters (Inches)<br>NumberPart  A B C D E H J Figure (Only for Reference)Device Mass (g)<br>Min Max Min Max Min Max Min Max Min Max Typ Typ<br>RUSBF – 6V<br>6. 9 11.4 4.3 5.9 7. 6 3.1 0.91 1.0<br>RUSBF075 — — — —  1,3,4 0.123<br>(0.27) (0.45) (0.17) (0.23) (0.30) (0.12) (0.036) (0.04)<br>6.9 11.7 4.3 5.9 7.6 3.1 0.91 1.0<br>RUSBF120 — — — —  1,3,4 0.111<br>(0.27) (0.46) (0.17) (0 .23 ) ( 0 . 30) (0.12) (0.036) (0.04)<br>6.9 11.7 4.3 5.9 7.6 3.1 0.91 1.0<br>RUSBF155 — — — —  1,3,4 0.135<br>(0. 2 7) (0.46) (0.17) (0.23) (0.30) (0.12) (0.036) (0.04)<br>RUSBF – 16V<br>7.4 12.2 4.3 5.8 7.6 3.1 0.89 0.8<br>RUSBF090 — — — —  2,3,4 0.183<br>(0.29) (0.48) (0.17) (0.23) (0.30) (0.12) (0.035) (0.03)<br>7.4 14.2 4.3 5.8 7.6 3.0 0.89 0.8<br>RUSBF110 — — — —  2,3,4 0.204<br>(0.29) (0.56) (0.17) (0.23) (0.30) (0.12) (0.035) (0.03)<br>8.9 13.5 4.3 5.8 7.6 3.0 0.89 1.0<br>RUSBF135 — — — —  2,3,4 0.240<br>(0.35) (0.53) (0.17) (0.23) (0.30) (0.12) (0.035) (0.04)<br>8.9 15.2 4.3 5.8 7.6 3.0 0.89 1.0<br>RUSBF160 — — — —  2,3,4 0.300<br>(0.35) (0.60) (0.17) (0.23) (0.30) (0.12) (0.035) (0.04)<br>10.2 15.7 4.3 5.8 7.6 3.0 0.89 1.0<br>RUSBF185 — — — —  2,3,4 0.368<br>(0.40) (0.62) (0.17) (0.23) (0.30) (0.12) (0.035) (0.04)<br>11.4 18.3 4.3 5.8 7.6 3.0 0.89 1.2<br>RUSBF250 — — — —  2,3,4 0.467<br>(0.45) (0.72) (0.17) (0.23) (0.30) (0.12) (0.035) (0.05)<br>**----- End of picture text -----**<br>


© 2022 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 10/26/22 

**4** 

PTC **Datasheet** 

**RUSBF Series** Radial Leaded 

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## **Packaging and Marking Information** 

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Part Bag Tape and Reel   Ammo Pack   Standard Package  Part   Agency<br>Number Quantity Quantity Quantity Quantity Marking Recognition<br>RUSBF – 6V<br>RUSBF075 500 — — 10,000 R75 UL, CSA, TÜV<br>RUSBF075-2 — 3,000 — 15,000 R75 UL, CSA, TÜV<br>RUSBF075-AP — — 2,000 10,000 R75 UL, CSA, TÜV<br>RUSBF120 500 — — 10,000 R120 UL, CSA, TÜV<br>RUSBF120-2 — 3,000 — 15,000 R120 UL, CSA, TÜV<br>RUSBF120-AP — — 2,000 10,000 R120 UL, CSA, TÜV<br>RUSBF155 500 — — 10,000 R155 UL, CSA, TÜV<br>RUSBF155-2 — 3,000 — 15,000 R155 UL, CSA, TÜV<br>RUSBF155-AP — — 2,000 10,000 R155 UL, CSA, TÜV<br>RUSBF160 500 — — 10,000 R160 UL, CSA, TÜV<br>RUSBF160-2 — 3,000 — 15,000 R160 UL, CSA, TÜV<br>RUSBF160-AP — — 2,000 10,000 R160 UL, CSA, TÜV<br>RUSBF – 16V<br>RUSBF090 500 — — 10,000 R90 UL, CSA, TÜV<br>RUSBF090-2 — 3,000 — 15,000 R90 UL, CSA, TÜV<br>RUSBF090-AP — — 2,000 10,000 R90 UL, CSA, TÜV<br>RUSBF110 500 — — 10,000 R110 UL, CSA, TÜV<br>RUSBF110-2 — 3,000 — 15,000 R110 UL, CSA, TÜV<br>RUSBF110-AP — — 2,000 10,000 R110 UL, CSA, TÜV<br>RUSBF135 500 — — 10,000 R135 UL, CSA, TÜV<br>RUSBF135-2 — 3,000 — 15,000 R135 UL, CSA, TÜV<br>RUSBF135-AP — — 2,000 10,000 R135 UL, CSA, TÜV<br>RUSBF160 500 — — 10,000 R160 UL, CSA, TÜV<br>RUSBF160-2 — 3,000 — 15,000 R160 UL, CSA, TÜV<br>RUSBF160-AP — — 2,000 10,000 R160 UL, CSA, TÜV<br>RUSBF185 500 — — 10,000 R185 UL, CSA, TÜV<br>RUSBF185-2 — 3,000 — 15,000 R185 UL, CSA, TÜV<br>RUSBF185-AP — — 2,000 10,000 R185 UL, CSA, TÜV<br>RUSBF250 500 — — 10,000 R250 UL, CSA, TÜV<br>RUSBF250-2 — 3,000 — 15,000 R250 UL, CSA, TÜV<br>RUSBF250-AP — — 2,000 10,000 R250 UL, CSA, TÜV<br>**----- End of picture text -----**<br>


© 2022 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 10/26/22 

**5** 

PTC **Datasheet** 

**RUSBF Series** Radial Leaded 

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## **Part Ordering Number System** 

## **RUSBF   250   U   2** 

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Packaging<br>Blank = Packaged in Bags<br>-1   = 25.4mm (1.0 in) Minimum Lead Length<br>-2   = Tape and Reel<br>-AP  = Ammo Pack<br>-X.X = Special Lead Cut Length (in)<br>Modifier<br>K   = Standard Kinked Lead<br>B   = Special Kinked Lead<br>S   = Straight Lead<br>U   = Uncoated Device<br>Hold Current Indicator<br>Product Series<br>An “F” at the end of product series indicates Pb-free version of product.<br>**----- End of picture text -----**<br>


**Note:** Kinked parts are recommended to control the height of the part on the PCB in non-auto PCB applications. 

© 2022 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 10/26/22 

**6** 

PTC **Datasheet** 

**RUSBF Series** Radial Leaded 

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## **Tape and Reel Specifications** 

RUSBF devices are available in tape and reel packaging per EIA468–B/IEC60286–2 standards. See Figures 1 and 2 for details. 

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Description EIA Mark Dimension (mm) Tolerance<br>Carrier Tape Width W 18 -0.5/+1.0<br>Hold-down Tape Width W4 11 Minimum<br>Top Distance between Tape Edges W6 3 Maximum<br>Sprocket Hole Position W5 9 -0.5/+0.75<br>Sprocket Hole Diameter W0 4 ± 0.2<br>Abscissa to Plane (Straight Lead)* H 18.5 ± 2.5<br>Abscissa to Plane (Kinked Lead)  (RUSBF075 to RUSBF250) H0 16.0  ± 0.5<br>Abscissa to Top  (RUSBF075 to RUSBF250)  H1 32.2 Maximum<br>Abscissa to Top* H1 45.0 Maximum<br>Overall Width with Lead Protrusion  (RUSBF075 to RUSBF250) C1 43.2 Maximum<br>Overall Width with Lead Protrusion C1 56 Maximum<br>Overall Width without Lead Protrusion  (RUSBF075 to RUSBF250) C2 42.5 Maximum<br>Overall Width without Lead Protrusion C2 56 Maximum<br>Lead Protrusion L1 1.0 Maximum<br>Protrusion of Cut-out L 11 Maximum<br>Protrusion beyond Hold-down Tape I2 Not Specified —<br>Sprocket Hole Pitch P0 12.7 ± 0.3<br>Device Pitch  (RUSBF075 to RUSBF250) — 12.7 ± 0.3<br>Device Pitch   — 25.4 ± 0.6<br>Pitch Tolerance — 20 Consecutive ± 1<br>Tape Thickness T 0.9 Maximum<br>Overall Tape and Lead Thickness  (RUSBF075 to RUSBF250) T1 1.5 Maximum<br>Overall Tape and Lead Thickness* T1 2.3 Maximum<br>Splice Sprocket Hole Alignment — 0 ± 0.3<br>Body Lateral Deviation D h 0 ± 1.0<br>Body Tape Plane Deviation D p 0 ± 1.3<br>Ordinate to Adjacent Component Lead (RUSBF075 to RUSBF250) P1 3.81 ± 0.7<br>Ordinate to Adjacent Component Lead   P1 7.62 ± 0.7<br>Lead Spacing*  (RUSBF075 to RUSBF250) F 5.05 ± 0.75<br>Lead Spacing*  F 10.15 ± 0.75<br>Reel Width  (RUSBF075 to RUSBF250) W2 56.0  Maximum<br>Reel Width   W2 63.5  Maximum<br>Reel Diameter A 370.0 Maximum<br>Space between Flanges*  (RUSBF075 to RUSBF250) W1 48.0 Maximum<br>Space between Flanges*   W1 55.0 Maximum<br>Arbor Hold Diameter C 26.0  ± 12.0<br>Core Diameter* N 91.0  Maximum<br>Box — 64/372/362 Maximum<br>Consecutive Missing Places — None —<br>Empty Places per Reel — 0.1%  Maximum<br>**----- End of picture text -----**<br>


*Differs from EIA specification. 

© 2022 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 10/26/22 

**7** 

PTC **Datasheet** 

**RUSBF Series** Radial Leaded 

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## **Tape and Reel Diagrams** 

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�h �h �p �p<br>Reference Plane<br>H1 P1 H1 C2<br>F H C1<br>L A B D4 H0 W5<br>W<br>I2<br>L1 P0 D0 Direction of Unreeling<br>Figure 1 Cross Section A-B<br>t<br>Reel<br>Upper Side<br>n<br>Type<br>a Direction of<br>Unreeling<br>Lower Side<br>c<br>w 1<br>Cross Section<br>w 2<br>Optional Shape: Circular or Polygonal<br>Figure 2<br>**----- End of picture text -----**<br>


## **Warning** 

- Users should independently evaluate the suitability of and test each product selected for their own application. 

- Operation beyond the maximum ratings or improper use may result in device damage and possible electrical arcing and flame. 

- These devices are intended for protection against damage caused by occasional overcurrent or overtemperature fault conditions and should not be used when repeated fault conditions or prolonged trip events are anticipated. 

- Contamination of the PPTC material with certain silicone-based oils or some aggressive solvents can adversely impact the performance of the devices. 

- Device performance can be impacted negatively if devices are handled in a manner inconsistent with recommended electronic, thermal, and mechanical procedures for electronic components. 

- PPTC devices are not recommended for installation in applications where the device is constrained such that its PTC properties are inhibited, for example in rigid potting materials or in rigid housings, which lack adequate clearance to accommodate device expansion. 

- Operation in circuits with a large inductance can generate a circuit voltage (Ldi/dt) above the rated voltage of the device. 

**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. 10/26/22 

**8**