# Resettable Fuse, PPTC, PolySwitch AHEF Series, 32 VDC, 1 A, 1.9 A, 6.2 s, Round

![Product image](https://novapart.co/image/farnell:2786603/)

**URL**: https://novapart.co/products/AHEF100/resettable-fuse-pptc-polyswitch-ahef-series-32-vdc
**SKU**: AHEF100
**Manufacturer**: LITTELFUSE
**Category**: Circuit Protection || Thermistors || Resettable Fuses || Radial Leaded PPTCs
**Price**: €0.3860
**Stock**: 10+
**Lead Time**: 85 days (indicative)

## Description

Thermistor Mounting:Through Hole; Product Range:PolySwitch AHEF Series; Holding Current:1A; Tripping Current:1.9A; Voltage Rating:32VDC; Operating Temperature Min:-40°C; Operating Te

## Specifications

| Parameter | Value |
|---|---|
| Svhc | To Be Advised |
| Height | 13.6mm |
| Length | - |
| Diameter | 9.7mm |
| Thickness | 3mm |
| Fuse Shape | Round |
| Lead Spacing | 5.8mm |
| Time To Trip | 6.2s |
| Trip Current | 1.9A |
| Product Range | PolySwitch AHEF Series |
| Voltage Rating | 32VDC |
| Holding Current | 1A |
| Current Rating Max | 100A |
| Thermistor Mounting | Through Hole |
| Operating Temperature Max | 125°C |
| Operating Temperature Min | -40°C |
| Automotive Qualification Standard | AEC-Q200 |

## Datasheet

📄 [Download PDF](https://novapart.co/datasheet/farnell:2786603/)

**PolySwitch[®] Resettable PPTCs** 

Radial Leaded  > AHEF Series 

## AHEF Series 

## RoHS ~~| @~~ 

## **Description** 

The AHEF Series is a PPTC resettable device designed specifically for the automotive industry.  It is a 32V high-temperature, lead-free, radial leaded resettable device that meets Littelfuse’s Automotive qualification. This qualification is based on AEC-Q200: Stress Test Qualification for Passive Components. 

## **Applications** 

- Motor and motor circuit protection including power doorlocks, mirrors, lumbar umps, seats, sunroofs and windows 

## **Features** Lo 

- Overcurrent and overvoltage circuit protection devices 

- Resettable and single-use overcurrent devices 

- Wide range of form factor and termination methods 

- Products meet applicable automotive industry standards 

- Devices compatible with high-volume electronics assembly 

- • RoHS compliant, Lead-Free and Halogen-Free 

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Additional Information<br>Lo<br>Datasheet Resources Samples<br>**----- End of picture text -----**<br>


- Electronic Control Unit (ECU) I/O protection 

- Heating, Ventilation and Cooling (HVAC) motor and I/O protection 

- Telematics, infotainment and navigations systems 

- Liquid Crystal Display (LCD) back-light heaters 

- Power and cigarette lighter outlets, plugs and adapter/chargers 

- Powered networks and buses 

- Air-flow detection and overcurrent protection in HVAC and cooling fan systems 

- Stall detection in express window and sunroof circuits 

- Resettable overcurrent protection for power distribution, electrical centers and junction boxes 

- Wire downsizing 

- Motor electromagnetic interference (EMI) suppression 

- Electrostatic discharge (ESD) damage protection 

• Load dump and other transient voltage protection 

|**Electrical Characteristics**<br>~~|~~|**Electrical Characteristics**<br>~~|~~|**Electrical Characteristics**<br>~~|~~|
|---|---|---|
|Part<br>Number|Ordering<br>Part<br>Number<br>IH(A)@<br>IH(A)@<br>IT<br>VMAX<br>IMAX<br>PD Typ<br>Max Time-to-trip<br>RMIN<br>RMAX<br>R1MAX<br>Lead Size<br>(mm<br>2/AWG)<br>(R1MAX)<br>(RaMAX)<br>(A)<br>(VDC)<br>(A)<br>(W)<br>(A)<br>(s)<br>(Ω)<br>(Ω)<br>(Ω)||
|AHEF050<br>AHEF070<br>AHEF100<br>AHEF300<br>AHEF500<br>AHEF750<br>AHEF1000|**AHEF (High Temperature) – 32V**<br>RF3055-000<br>0.5<br>0.5<br>1.0<br>32<br>100<br>0.9<br>2.5<br>3.0<br>0.3500<br>1.100<br>1.100<br>0.205/24<br>RF3355-000<br>0.7<br>0.7<br>1.4<br>32<br>100<br>1.4<br>3.5<br>3.2<br>0.2300<br>0.800<br>0.800<br>0.205/24<br>RF3356-000<br>1.0<br>1.0<br>1.9<br>32<br>100<br>1.4<br>5.0<br>6.2<br>0.1500<br>0.430<br>0.430<br>0.205/24<br>RF3357-000<br>3.0<br>3.0<br>6.0<br>32<br>100<br>3.2<br>15.0<br>5.0<br>0.0350<br>0.110<br>0.110<br>0.52/20<br>RF3358-000<br>5.0<br>5.0<br>10.0<br>32<br>100<br>5.3<br>25.0<br>9.0<br>0.0150<br>0.040<br>0.040<br>0.52/20<br>RF3359-000<br>7.5<br>7.5<br>15.0<br>32<br>100<br>6.5<br>37.5<br>13.0<br>0.0074<br>0.023<br>0.023<br>0.52/20<br>RF3360-000<br>10.0<br>10.0<br>20.0<br>32<br>100<br>7.0<br>50.0<br>15.0<br>0.0060<br>0.016<br>0.016<br>0.82/18<br>~~a~~<br>~~a se ee ee~~<br>~~a~~<br>~~se i eeee~~<br>~~a a se ee ee~~<br>~~a a se a~~<br>~~ee ee ee ee ee~~<br>~~a~~<br>~~se ee ee ee~~<br>~~ee~~<br>~~a~~<br>~~ee a ee ee ee ee ee~~<br>~~a sseeee~~||



## **Notes:** 

- IH : Hold current: maximum current device will pass without interruption in 25°C,    unless otherwise specified. 

IT : Trip current: minimum current that will switch the device from low-resistance to    high-resistance in 25°C still air, unless otherwise specified. 

- VMAX : Maximum 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 25°C still air,    unless otherwise specified. 

- RMIN : Minimum resistance of device as supplied at 25°C, unless otherwise specified. R1MAX : Maximum resistance of device when measured one hour post trip at 25°C unless    otherwise specified. 

- RaMAX : Maximum functional resistance of device after being subjected to the stresses    described in PS400 at 25°C, unless otherwise specified. 

- RaMIN :   described in PS400 at 25°C, unless otherwise specified.Minimum functional resistance of device after being subjected to the stresses 

- Electrical characteristics determined at 25°C. 

© 2021 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 07/16/21 

**PolySwitch[®] Resettable PTCs** Radial Leaded  > AHEF Series 

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**----- Start of picture text -----**<br>
Temperature Rerating<br>Maximum Ambient Temperature<br>-40°C  -20°C  0°C  20°C   25°C  40°C 50°C 60°C 70°C 85°C 125°C<br>Hold Current (A)<br>AHEF (High Temperature) – 32V<br>AHEF050 0.7 0.6  0.60  0.5  0.5  0.4  0.400 0.40 0.30 0.300 0.1<br>AHEF070 1.0  0.9  0.80  0.7  0.7  0.6  0.600 0.50 0.50 0.400 0.2<br>AHEF100 1.4  1.2  1.10  1.0  1.0  0.9  0.800 0.70 0.70 0.600 0.2<br>AHEF300 4.1  3.8  3.42  3.1  3.0  2.7  2.430 2.22 1.98 1.650 0.6<br>AHEF500 6.8  6.3  5.70  5.2  5.0  4.5  4.050 3.70 3.30 2.750 1.0<br>AHEF750 10.2  9.4  8.55  7.7  7.5  6.7  6.075 5.55 4.95 4.125 1.5<br>AHEF1000 13.6  12.5  11.40  10.3  10.0  8.9  8.100 7.40 6.60 5.500 2.0<br>**----- End of picture text -----**<br>


## **Temperature Rerating Curve** 

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200<br>150<br>100<br>50<br>0<br>-40 -20 0 20 40 60 80 100 120<br>Ambient Temperature (˚C)<br>% of Rated Hold and Trip Current<br>**----- End of picture text -----**<br>


## **Part Ordering Number System** 

## **AHEF   300   -2** 

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**Packaging Option** (Blank) = Bulk 2 = Tape and Reel Packaging AP = Ammo Pack **Hold Current Indicator** 

**Product Series** An “F” at the End of the Series Indicates Pb-free Version of Product 

© 2021 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 07/16/21 

**PolySwitch[®] Resettable PPTCs** Radial Leaded  > AHEF Series 

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## **Typical Time-to-Trip Curves at 25°C** 

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AHEF 1000<br>A =  AHEF050<br>B =  AHEF070 E<br>100<br>C =  AHEF100 F G<br>D =  AHEF300 A B C D<br>E =  AHEF500 10<br>F =  AHEF750<br>G =  AHEF1000<br>1 G<br>F<br>E<br>0.1<br>D<br>0.011 10 A B C 100<br>Fault Current (A)<br>Physical Specifications<br>AHEF050 to AHEF100 : Tin-plated Copper-clad Steel, 0.205mm [2]  (24 AWG), ø 0.51mm/0.020in.<br>Lead Material AHEF300 to AHEF750 : Tin-plated Copper 0.52mm [2]  (20 AWG), ø 0.81mm/0.032in<br>AHEF1000 : Tin-plated Copper 0.82mm [2]  (18 AWG), ø 1.0mm/0.04in<br>Soldering Characteristics Solderability per ANSI/J-STD 002 Category 3<br>Solder Heat Withstand Per IEC 68-2-20, Test Tb, Method 1a, Condition b; Can Withstand 10 s at 260°C ± 5°C<br>Insulating Material Cured, Flame-retardant Epoxy Polymer; Meets UL 94V-0 Requirements<br>Operation Temperature -40°C~125°C<br>Note:  See PS400 for other physical characteristics.<br>Devices are not designed to be placed through a reflow process.<br>Environmental Specifications<br>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 125°C, -40°C 10 times ±5%<br>Solvent Resistance MIL-STD-202, Method 215F No change<br>Note:  See PS400 for other environmental specifications.<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<br>Devices may not meet specified values if these storage conditions are exceeded.<br>Time-to-Trip (s)<br>**----- End of picture text -----**<br>


© 2021 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 07/16/21 

**PolySwitch[®] Resettable PTCs** 

Radial Leaded  > AHEF Series 

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## **Dimension Figures** 

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A E A E A E<br>J<br>J<br>B B B<br>Figure 4<br>D D D A<br>C<br>C F C F C F<br>CL CL CL CL CL to CL CL CL CL to CL CL CL E H<br>Figure 1 Figure 2 Figure 3<br>**----- End of picture text -----**<br>


**Figure 5** 

## **Dimensions** 

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Dimensions in Millimeters (Inches)<br>Part<br>A B C D E F G H J Figure<br>Number<br>Min Max Min Max Min Max Min M ax Min Max Min Max Min Max Typ Typ<br>AGRF  (High Temperature) – 32V<br>7.4 12.7 4.3 5.8 7.6 3.3<br>AHEF050 — — — — — — — — — — 1,4,5<br>(0.29) (0.50) (0.17) (0.23) (0.30) (0.13)<br>6.9 10.8 4.3 5.8 7.6 3.0<br>AHEF070 — — — — — — — — — — 2,4,5<br>(0.27) (0.43) (0.17) (0.23) (0.30) (0.12)<br>9.7 13.6 4.3 5.8 7.6 3.0<br>AHEF100 — — — — — — — — — — 1,4,5<br>(0.38) (0.54) (0.17) (0.23) (0.30) (0.12)<br>10.2 15.5 4.32 5.84 7.6 3.8<br>AHEF300 — — — — — — — — — — 3,4,5<br>(0.40) (0.61) (0.17) (0.23) (0.30) (0.15)<br>14.0  24.1 4.3 5.8 11.5 3.8<br>AHEF500 — — — — — — — — — — 3,4,5<br>(0.55) (0.95) (0.17) (0.23) (0.45) (0.15)<br>21.1 24.9 9.4 10.9 7.6 3.8<br>AHEF750 — — — — — — — — — — 3,4,5<br>(0.83) (0.98) (0.37) (0.43) (0.30) (0.15)<br>23.5 27.9 9.4 10.9 7.6 4.0<br>AHEF1000 — — — — — — — — — — 3,4,5<br>(0.93) (1.10) (0.37) (0.43) (0.30) (0.16)<br>Packaging and Marking Information<br>Part Bag Tape and Reel   Ammo Pack   Standard Package  Part   Agency<br>Number Quantity Quantity Quantity Quantity Marking Recognition<br>AHEF (High Temperature) – 32V<br>AHEF050 500 — — 10,000 E0.5 *<br>AHEF070 500 — — 10,000 E0.7 *<br>AHEF100 500 — — 10,000 E1 *<br>AHEF300 500 — — 10,000 E3 *<br>AHEF500 250 — — 5,000 E5 *<br>AHEF750 250 — — 5,000 E7.5 *<br>AHEF1000 250 — — 5,000 E10 *<br>**----- End of picture text -----**<br>


*These devices are intended for use in automotive applications. 

© 2021 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 07/16/21 

**PolySwitch[®] Resettable PPTCs** 

Radial Leaded  > AHEF Series 

**==> picture [94 x 32] intentionally omitted <==**

## **Tape and Reel Specifications** 

AHEF devices are available in tape and reel packaging per EIA468-B/IEC286-2 and EIA 481-2 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 -0.5/+1.0<br>Hold Down Tape Width W4 11.0 Minimum<br>Top Distance between Tape Edges W6 3.0 Maximum<br>Sprocket Hole Position W5 9.0 -0.5/+0.75<br>Sprocket Hole Diameter D0 4.0 ±0.2<br>Abscissa to Plane (Straight Lead) (AHEF300 to AHEF1000) H 20.3 ±0.5<br>Abscissa to Plane (Kinked Lead) (AHEF050 to AHEF100) H0 20.3 ±0.5<br>Abscissa to Top (AHEF050 to AHEF300) H1 32.2 Maximum<br>Abscissa to Top (AHEF500 to AHEF1000) H1 45.0 Maximum<br>Overall Width with Lead Protrusion (AHEF050 to AHEF300) C1 43.2 Maximum<br>Overall Width with Lead Protrusion (AHEF500 to AHEF1000) C1 55.0 Maximum<br>Overall Width without Lead Protrusion (AHEF050 to AHEF300) C2 42.5 Maximum<br>Overall Width without Lead Protrusion (AHEF500 to AHEF1000) C2 54.0 Maximum<br>Lead Protrusion L1 1.0 Maximum<br>Protrusion of Cut-out L 11.0 Maximum<br>Protrusion Beyond Hold-Down Tape I2 Not specified —<br>Sprocket Hole Pitch P0 12.7 ± 0.3<br>Device Pitch (AHEF050 to AHEF300) — 12.7 ± 0.3<br>Device Pitch (AHEF500 to AHEF1000) — 25.4 ± 0.6<br>Pitch Tolerance — 20 consec. ± 0.1<br>Tape Thickness t 0.9 Maximum<br>Overall Tape and Lead Thickness (AHEF050 to AHEF750) t1 2.0 Maximum<br>Overall Tape and Lead Thickness (AHEF1000) t1 2.3 Maximum<br>Splice Sprocket Hole Alignment — 0 ± 0.3<br>Body Lateral Deviation h 0 ± 1.0<br>Body Tape Plane Deviation p 0 ± 1.3<br>Ordinate to Adjacent Component Lead (AHEF050 to AHEF500) P1 3.81 ± 0.7<br>Ordinate to Adjacent Component Lead (AHEF750 to AHEF1000) P1 7.62 ± 0.7<br>Lead Spacing  (AHEF050 to AHEF500) F 5.05 ± 0.75<br>Lead Spacing  (AHEF750 to AHEF1000) F 10.15 ± 0.75<br>Reel Width  (AHEF050 to AHEF300) w2 56.0 Maximum<br>Reel Width  (AHEF500 to AHEF1000) w2 63.5 Maximum<br>Reel Diameter A 370.0 Maximum<br>Space between Flanges*  (AHEF050 to AHEF300) w1 48.0 Maximum<br>Space between Flanges*  (AHEF500 to AHEF1000) 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. 

© 2021 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 07/16/21 

**PolySwitch[®] Resettable PTCs** 

Radial Leaded  > AHEF Series 

**==> picture [93 x 32] intentionally omitted <==**

## **Tape and Reel Diagrams** 

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**----- Start of picture text -----**<br>
�h �h �p �p<br>Reference Plane<br>H1 P1 H1 C2<br>F H C1<br>L A B W4 H0 W5<br>W<br>I2<br>L1 P 0 D0 Direction of Unreelin g<br>Figure 1 Cross Section A-B<br>t<br>Reel<br>Upper Side<br>n<br>Tape<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. 

© 2021 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 07/16/21 



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