MF-USMD075-2 Equivalent & Substitute Parts

Part Overview

The MF-USMD075-2 is a Polymeric PTC Resettable Fuse manufactured by Bourns Inc., rated for 6V maximum voltage with 750 mA hold current. This component is designed for surface mount applications in the 1210 (3225 Metric) package format. The part is currently listed as Obsolete, which necessitates identification of active equivalent components to maintain design continuity and ensure ongoing component availability for production and repair applications.

Substiute Parts

MF-USMD075-2

Bourns Inc.In Stock: 6121MF-USMD075-2 Datasheet

Current PartRFQ

MF-USMF075-2

Bourns Inc.In Stock: 84124MF-USMF075-2 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MF-USMD075-2 is determined by strict equivalence across the following critical parameters:

• Voltage rating: 6V maximum
• Current hold specification: 750 mA
• Current trip specification: 1.5 A
• Resistance characteristics: Initial minimum 70 mOhms, post-trip maximum 450 mOhms
• Operating temperature range: -40°C to 85°C
• Package format: 1210 (3225 Metric) surface mount
• Polymeric PTC fuse type

The MF-USMF075-2 meets all electrical and mechanical requirements for direct substitution. Both components share identical voltage, current, resistance, and temperature specifications. The primary distinction is product status and packaging configuration.

Parameter Comparison

Engineering Selection Recommendations

The MF-USMF075-2 is the direct equivalent for the obsolete MF-USMD075-2. Selection of the MF-USMF075-2 is supported by:

• Identical electrical specifications across all critical parameters
• Active product status ensuring ongoing availability
• ROHS3 compliance versus non-compliant status of the original part
• Maintained certifications from TUV and cURus approval agencies
• Higher inventory availability (84,100 pieces in stock versus 6,075 pieces)

The concave package geometry of the MF-USMF075-2 represents a design refinement and does not impact electrical performance or mechanical compatibility in standard 1210 footprint applications.

Frequently Asked Questions (FAQ)

Q: Can the MF-USMF075-2 be used as a direct replacement for the MF-USMD075-2?

A: Yes. Both components share identical electrical specifications including voltage rating, current hold and trip values, resistance characteristics, and operating temperature range. The MF-USMF075-2 is electrically and mechanically compatible with the MF-USMD075-2 footprint.

Q: What is the difference between the concave and standard package geometry?

A: The MF-USMF075-2 features a concave package design, which is a geometric refinement of the 1210 (3225 Metric) form factor. This does not affect electrical performance or standard PCB mounting compatibility.

Q: Why is RoHS compliance status different between the two parts?

A: The MF-USMD075-2 is listed as RoHS non-compliant and is now obsolete. The MF-USMF075-2 is ROHS3 compliant, reflecting current manufacturing standards and regulatory requirements.

Q: Are the approval certifications equivalent?

A: Both parts carry TUV certification. The MF-USMD075-2 includes CSA and UR approvals, while the MF-USMF075-2 carries cURus certification. Both meet industry safety standards for polymeric PTC resettable fuses.

Q: What is the impact of the thickness difference?

A: The MF-USMD075-2 has a maximum thickness of 0.024" (0.62mm), while the MF-USMF075-2 has a maximum thickness of 0.033" (0.85mm). This difference is within standard 1210 package tolerances and does not impact PCB assembly or electrical performance in typical applications.