PolySwitch® Resettable PPTC Datasheet
AHEF Series
Radial Leaded
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.
Features & Benefits
■ 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
Additional Information
Applications
■ Motor and motor circuit
protection including power
door-locks, mirrors, lumbar
umps, seats, sunroofs and
windows
■ Air-flow detection and
overcurrent protection
in HVAC and cooling fan
systems
■ Stall detection in express
Resources
Accessories
Samples
■ Electronic Control Unit (ECU)
window and sunroof circuits
I/O protection
■ Resettable overcurrent
protection for power
distribution, electrical centers
and junction boxes
Agency Approvals
■ Heating, Ventilation and
Cooling (HVAC) motor and
I/O protection
Agency
Agency File/Certificate Number
E74889
■ Telematics, infotainment and
■ Wire downsizing
navigations systems
■ Motor electromagnetic
interference (EMI)
suppression
■ Liquid Crystal Display (LCD)
back-light heaters
■ Power and cigarette lighter
outlets, plugs and adapter/
chargers
■ Electrostatic discharge (ESD)
damage protection
■ Load dump and other
■ Powered networks and buses
transient voltage protection
Electrical Characteristics
IH(A)@ IH(A)@
IT
VMAX
(VDC
IMAX
(A)
PD Typ
(W)
Max Time-to-trip
RMIN
(Ω)
RMAX
(Ω)
R1MAX
(Ω)
Part
Number
Ordering Part
Number
Lead Size
(mm2/AWG)
(R1MAX
)
(RaMAX
)
(A)
)
(A)
(s)
AHEF (HighTemperature) – 32V
AHEF050 RF3055-000
AHEF070 RF3355-000
AHEF100 RF3356-000
AHEF300 RF3357-000
AHEF500 RF3358-000
AHEF750 RF3359-000
AHEF1000 RF3360-000
0.5
0.7
1.0
3.0
5.0
7.5
0.5
0.7
1.0
3.0
5.0
7.5
1.0
1.4
1.9
32
32
32
32
32
32
32
100
100
100
100
100
100
100
0.9
1.4
1.4
3.2
5.3
6.5
7.0
2.5
3.5
5.0
15.0
25.0
37.5
50.0
3.0
3.2
6.2
5.0
9.0
0.3500
0.2300
0.1500
0.0350
0.0150
0.0074
0.0060
1.100
0.800
0.430
0.110
0.040
0.023
0.016
1.100
0.800
0.430
0.110
0.040
0.023
0.016
0.205/24
0.205/24
0.205/24
0.52/20
0.52/20
0.52/20
0.82/18
6.0
10.0
15.0
20.0
13.0
15.0
10.0
10.0
Notes:
IH
: Hold current: maximum current device will pass without interruption in 25°C,
unless otherwise specified.
: Trip current: minimum current that will switch the device from low-resistance to
high-resistance 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 AEC-Q200 at 25°C, unless otherwise specified.
IT
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.
RaMIN
:
Minimum functional resistance of device after being subjected to the stresses
described in AEC-Q200 at 25°C, unless otherwise specified.
* Electrical characteristics determined at 25°C.
© 2022 Littelfuse, Inc.
Specifications are subject to change without notice.
1
Revised: GD.09/20/22