MF-USMD005-2 Equivalent & Substitute Parts

Part Overview

The MF-USMD005-2 is a Polymeric PTC Resettable Fuse manufactured by Bourns Inc., rated for 30V maximum voltage with a 50 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, making identification of suitable substitute components essential for ongoing design support and production continuity.

Substiute Parts

MF-USMD005-2

Bourns Inc.In Stock: 1021MF-USMD005-2 Datasheet

Current PartRFQ

MF-USMF005-2

Bourns Inc.In Stock: 290190MF-USMF005-2 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MF-USMD005-2 is determined by strict equivalence across the following electrical and mechanical parameters:

• Voltage rating: 30V maximum
• Hold current (Ih): 50 mA maximum
• Trip current (It): 150 mA
• Maximum current capacity: 10 A
• Time to trip: 1.5 s
• Initial resistance (Ri): 2.8 Ohms minimum
• Post-trip resistance (R1): 50 Ohms maximum
• Operating temperature range: -40°C to 85°C
• Package format: 1210 (3225 Metric) surface mount
• Physical dimensions and thickness compatibility

The MF-USMF005-2 meets all these criteria and is identified as a direct substitute. Both components are Polymeric PTC Resettable Fuses from the Multifuse® series manufactured by Bourns Inc.

Parameter Comparison

Engineering Selection Recommendations

The MF-USMF005-2 is the direct substitute for the obsolete MF-USMD005-2. Both components share identical electrical characteristics and mechanical dimensions, ensuring functional equivalence in circuit applications.

The MF-USMF005-2 offers the following advantages:

• Active product status with current manufacturing support
• ROHS3 compliance, meeting modern environmental and regulatory requirements
• Significantly higher inventory availability (290,100 pieces versus 972 pieces)
• Equivalent certifications from recognized approval agencies (cURus, TUV)

The primary difference is the package geometry designation (Concave for the substitute), which reflects a minor physical variation within the 1210 (3225 Metric) footprint that does not affect electrical performance or PCB assembly compatibility.

Frequently Asked Questions (FAQ)

Q: Are the MF-USMD005-2 and MF-USMF005-2 electrically identical?

A: Yes. Both components have identical voltage ratings (30V), hold current (50 mA), trip current (150 mA), maximum current (10 A), time to trip (1.5 s), initial resistance (2.8 Ohms minimum), and post-trip resistance (50 Ohms maximum). Operating temperature ranges are also identical (-40°C to 85°C).

Q: What is the difference between the package designations?

A: The MF-USMD005-2 uses a standard 1210 (3225 Metric) package, while the MF-USMF005-2 uses a 1210 (3225 Metric) Concave package. Both maintain the same external dimensions (0.127" L x 0.102" W, 3.22mm x 2.58mm) and thickness (0.033" / 0.85mm maximum). The Concave designation indicates a minor geometric variation that does not affect PCB assembly or circuit performance.

Q: Can the MF-USMF005-2 be used as a direct replacement on existing PCBs designed for the MF-USMD005-2?

A: Yes. The components are mechanically and electrically compatible. The identical footprint dimensions and surface mount characteristics ensure compatibility with existing PCB designs without layout modifications.

Q: What is the significance of the RoHS compliance difference?

A: The MF-USMD005-2 is RoHS non-compliant, while the MF-USMF005-2 is ROHS3 compliant. For new designs or applications subject to environmental regulations, the MF-USMF005-2 is the appropriate selection.

Q: Why is the MF-USMD005-2 listed as obsolete?

A: The MF-USMD005-2 has been discontinued by the manufacturer. The MF-USMF005-2 represents the current active product line continuation with equivalent specifications and improved compliance status.