MF-USMF005-2

Overview

The Bourns MF-USMF005-2 is a surface-mount PPTC resettable fuse from the Multifuse series, designed for circuit protection in compact electronic assemblies. It features a 1210 (3225 metric) package with dimensions of 3.43 mm length, 2.8 mm width, and 1.1 mm height. Key electrical parameters include a holding current of 50 mA, a trip current of 150 mA, and a maximum voltage rating of 30 VDC. The device has a maximum rated current of 10 A and an initial resistance of 50 Ohms. It operates within a temperature range of -40°C to +85°C and dissipates 600 mW of power. This component is qualified under the AEC-Q100 standard.

Feature Summary

• Provides fast-tripping self-resetting circuit protection against overcurrent conditions.
• Complies with AEC-Q100 automotive qualification standards for reliability.
• Utilizes a small SMD/SMT footprint suitable for space-constrained board layouts.

Applications

• Automotive electronics systems requiring AEC-Q100 compliance
• Consumer electronic devices needing compact overcurrent protection
• Industrial equipment circuits requiring surface-mount resettable fuses

Procurement Notes

Verify that the specific part number matches the required AEC-Q100 qualification status, as automotive-grade components often have strict sourcing requirements. Confirm that the 1210 package dimensions align with the PCB footprint design rules. Ensure the operating temperature range of -40°C to +85°C meets the environmental specifications of the target application. Cross-reference the datasheet for any specific soldering profile recommendations to maintain component integrity during assembly processes.

Selection Notes

Select this component when a low-profile surface-mount solution is required for protecting low-current circuits up to 50 mA holding current. The 30 VDC rating limits its use to low-voltage applications; higher voltage circuits require different series ratings. Consider the 50 Ohm initial resistance if voltage drop across the fuse is a critical design constraint. The AEC-Q100 qualification makes it suitable for automotive environments where higher reliability standards are mandated compared to general consumer electronics.

Part Context

This part belongs to the Bourns MF-USMF Multifuse series, which specializes in high-reliability PTC resettable fuses. The series is engineered to provide rapid response to fault events while maintaining a small physical size. These components serve as alternatives to traditional one-time fuses, offering reusable protection capabilities. The Multifuse line is widely recognized for its consistency in performance across various industrial and automotive sectors.

Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation. Consult official Bourns resources for potential cross-references or obsolescence notices.