Resettable fuses shrink for portable and wearable devices

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Littelfuse, Inc. has released a new series of polymeric positive temperature coefficient (PPTC) devices, also called resettable fuses, to protect ever-shrinking mobile and wearable devices. The PolySwitch zeptoSMDC series provides overcurrent and overvoltage protection on the signal lines for both the lithium-ion battery pack ICs and fuel gauge. Resettable PPTCs do not require replacement after a fault event; they allow the circuit to return to the normal operating condition after the power has been removed and/or the overcurrent condition is eliminated.

Littelfuse PTC zeptoSMDC Series resettable fusesDesigned for high-voltage (13 VDC) applications, the PPTCs, available in a surface-mount 0201 package size, target small consumer electronics applications from wearables and smartphones to portable medical equipment and mobile point-of-sale devices. These resettable fuses, designed to protect the battery fuel gauge and battery management IC, reset to normal operation after the fault is cleared.


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The zeptoSMDC series of PPTCs are available on tape and reel in quantities of 15,000. Sample requests may be placed through authorized Littelfuse distributors worldwide.

Littelfuse also offers surface mount PolySwitch ASMDC, femtoASMD, and picoASMD series of resettable PPTCs. Applications for the ASMDC, femtoASMD, and picoASMD Series 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.

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