1210L020/72WR

Ptc Resettable Fuses Overview

The Littelfuse Inc. 1210L020/72WR is a PolySwitch resettable PTC fuse designed for surface mount circuit protection. It operates at a maximum voltage of 30V with a hold current (Ih) of 200 mA and a trip current (It) of 400 mA. The device features a minimum initial resistance of 1.6 Ohms and a maximum post-trip resistance of 15 Ohms. It supports a maximum fault current of 10 A and functions within an operating temperature range of -40°C to 85°C.

Ptc Resettable Fuses Feature Summary

• Provides reliable overcurrent protection by raising resistance as it heats to limit current flow
• Automatically resets to low resistance state after the fault condition is removed and the device cools down
• Designed for surface mount installation on printed circuit boards

Ptc Resettable Fuses Applications

• Protection of circuits in battery chargers
• Overcurrent protection for AC-DC power converters
• Circuit safeguarding in DC-DC power converters
• Protection for electronic ballasts

Ptc Resettable Fuses Procurement Notes

Verify that the specific suffix /72WR matches the required packaging format, such as tape and reel quantity or cut tape specifications, against the manufacturer's official documentation. Confirm that the component meets all necessary agency approvals and RoHS compliance requirements for the intended end-use application before finalizing procurement orders.

Ptc Resettable Fuses Selection Notes

Select this component when a surface mount solution is required for low-voltage circuits needing 200 mA continuous current protection. Ensure the design accounts for the 15 Ohm maximum resistance in the tripped state to verify compatibility with downstream circuit sensitivity and voltage drop requirements during fault conditions.

Ptc Resettable Fuses Part Context

This part belongs to the PolySwitch family of polymer positive temperature coefficient devices from Littelfuse. These components are solid-state fuses used to protect automotive, telecom, and general electronics applications from overcurrent events, offering a reusable alternative to traditional one-time fusible links.

Ptc Resettable Fuses Replacement Considerations

Public confirmed substitute part numbers include SMD1210B020TF from YAGEO and 1210L010WR from Littelfuse. Verify parameter equivalence and package compatibility before substitution.