Resettable Devices Replace Fuses For Automotive Overcurrent Protection

PTC femtoASMD picoASMD ASMDC Group Image

Littelfuse has introduced three series of surface mount devices designed for robust overcurrent protection in extremely harsh automotive environments. Unlike fuses, the new resettable Polymeric Positive Temperature Coefficient (PPTC) devices restore systems to operation after the fault condition is resolved, for greater safety and convenience.

Typical applications for the ASMDC, femtoASMD, and picoASMD Series Resettable PPTCs include automotive infotainment, communications (GPS navigation), network (CAN Bus, LIN bus), body electronics (door locks, lumbar pumps), security (keyless entry, rearview camera), ADAS (advanced driver assistance system) and climate control systems.

The 2920-size ASMDC Series is the largest of the new devices. It has a lower profile compared to existing 2920 size ASMD series surface mount PPTCs, and no heavy metal terminals. It also offers the highest holding current and voltage rating of the three, according to Littlefuse.

The other two smaller devices, the 0603-size femtoASMD Series and the 0805-size picoASMD Series, are ideal for applications in crowded automotive electronics boards.

“The choice of compact footprint or low profile packaging combined with AEC-Q200 qualification make these SMD resettable PPTCs ideal for overcurrent and short-circuit protection under the hood,” said Yong Zhang, product manager, PPTC Devices at Littelfuse.

“Together, they extend the wide range of form factors, operating currents, and voltage ranges Littelfuse offers, and give automotive electronics designers greater design flexibility”, he added.

Surface mount PolySwitch ASMDC, femtoASMD, and picoASMD Series Resettable PPTCs are available in tape and reel packaging in quantities of 4,000 or 3,000. For further information, view the full Press release.

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