MF-USML450/12-2

Overview

The MF-USML450/12-2 is a surface-mount polymeric resettable fuse from the Bourns Multifuse USML series. It features a maximum voltage rating of 12V and a hold current of 4.5A, with a trip current of 9A. The device supports a maximum fault current of 50A and has a typical resistance of 0.002 Ohms. Packaged in a 1210 (3225 Metric) case size measuring 3.43 x 2.8 x 1.2mm, it offers rapid response characteristics with a time to trip of approximately 2 seconds.

Feature Summary

• Polymeric PTC technology for automatic circuit protection
• Surface mount construction for automated assembly
• Low impedance design minimizing power loss

Applications

• Portable electronic devices
• Battery pack protection
• USB port overcurrent protection

Procurement Notes

Verify the specific ordering suffix matches the required package quantity and tape-and-reel specifications. Confirm that the component meets RoHS compliance requirements for your manufacturing process. Ensure the supplier provides original manufacturer documentation to guarantee authenticity and traceability of the batch.

Selection Notes

Select this component when low operating voltage and high hold current are required in a compact footprint. The 12V rating limits its use to low-voltage circuits, while the 4.5A hold current suits moderate load applications. Consider the 1210 package dimensions for PCB space constraints and thermal management needs during normal operation.

Part Context

This part belongs to the Multifuse USML series, designed for low-ohmic applications requiring fast response times. The series utilizes polymeric materials to provide reliable resettable protection against overcurrent conditions without permanent damage to the circuit.

Replacement Considerations

Consult official Bourns documentation for direct cross-reference data. Verify that any substitute maintains identical voltage, current, and package specifications to ensure circuit compatibility.