MF-USMD050-2 Equivalent & Substitute Parts

Part Overview

The MF-USMD050-2 is a Polymeric PTC Resettable Fuse manufactured by Bourns Inc., rated at 13.2V with a 500 mA hold current. This component is designed for overcurrent protection in surface mount applications using the 1210 (3225 Metric) package format. The part is currently listed as Obsolete, making identification of suitable substitutes essential for ongoing design support and component procurement.

Substiute Parts

MF-USMD050-2

Bourns Inc.In Stock: 4455MF-USMD050-2 Datasheet

Current PartRFQ

MF-USMF050-2

Bourns Inc.In Stock: 30277MF-USMF050-2 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MF-USMD050-2 is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

• Voltage Rating: 13.2V maximum
• Current - Hold (Ih): 500 mA
• Current - Trip (It): 1 A
• Current - Max: 40 A
• Time to Trip: 100 ms
• Resistance - Initial (Ri): 180 mOhms (Min)
• Resistance - Post Trip (R1): 900 mOhms (Max)
• Operating Temperature Range: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 1210 (3225 Metric)
• Size / Dimension: 0.127" L x 0.102" W (3.22mm x 2.58mm)

The MF-USMF050-2 qualifies as a direct substitute based on identical electrical specifications and compatible package dimensions. While the MF-USMF050-2 exhibits a slightly increased maximum thickness (0.033" vs. 0.024"), it maintains the same footprint and electrical performance characteristics required for functional equivalence.

Parameter Comparison

Engineering Selection Recommendations

The MF-USMF050-2 is the primary substitute for the obsolete MF-USMD050-2. Both components are manufactured by Bourns Inc. and share identical electrical specifications across all critical parameters: voltage rating, hold current, trip current, maximum current, trip time, and resistance characteristics.

The MF-USMF050-2 offers the advantage of Active product status, ensuring continued availability and manufacturing support. The component carries ROHS3 compliance, addressing regulatory requirements that may not be met by the RoHS non-compliant MF-USMD050-2. The MF-USMF050-2 also includes AEC-Q200 automotive qualification, providing additional reliability assurance for applications requiring automotive-grade components.

The thickness differential (0.033" vs. 0.024") must be evaluated within the context of specific PCB layout constraints. The identical footprint dimensions (0.127" L x 0.102" W) ensure mechanical compatibility with existing designs, though board clearance verification is necessary for applications with height-sensitive placement requirements.

Frequently Asked Questions (FAQ)

Q: Can the MF-USMF050-2 be used as a direct replacement for the MF-USMD050-2?

A: Yes. Both components share identical electrical specifications including voltage rating (13.2V), hold current (500 mA), trip current (1 A), and operating temperature range (-40°C ~ 85°C). The footprint dimensions are identical, supporting direct PCB substitution.

Q: What is the significance of the thickness difference between these parts?

A: The MF-USMF050-2 has a maximum thickness of 0.033" compared to 0.024" for the MF-USMD050-2. This 0.009" difference must be considered in applications with restricted vertical clearance or where component stacking is involved. Verify PCB layout compatibility before implementation.

Q: Why is the MF-USMD050-2 listed as Obsolete?

A: The MF-USMD050-2 has reached end-of-life status. The MF-USMF050-2 represents the active product line continuation from Bourns Inc., offering equivalent electrical performance with improved compliance and availability.

Q: What does the Concave designation on the MF-USMF050-2 indicate?

A: The Concave designation refers to the physical geometry of the component's surface. This is a mechanical characteristic that does not affect electrical performance or substitution compatibility.

Q: Is RoHS compliance a factor in selecting between these parts?

A: RoHS compliance status depends on application requirements. The MF-USMD050-2 is RoHS non-compliant, while the MF-USMF050-2 is ROHS3 compliant. Applications subject to RoHS regulations must use the MF-USMF050-2.

Q: What does AEC-Q200 qualification mean?

A: AEC-Q200 is an automotive industry standard qualification for passive components. The MF-USMF050-2 carries this rating, indicating suitability for automotive applications requiring enhanced reliability and quality assurance.

Q: Are the approval agencies the same for both parts?

A: Both components carry TUV approval. The MF-USMD050-2 includes CSA and UR approvals, while the MF-USMF050-2 carries cURus approval. Verify specific approval requirements for your application.