MF-USMF175-2 Equivalent & Substitute Parts

Part Overview

The MF-USMF175-2 is a polymeric PTC resettable fuse manufactured by Bourns Inc. in the Multifuse® series. This surface mount component is designed for overcurrent protection in 6V circuits with a 1.75A hold current rating. The part is actively produced and widely available with 1048 units in current inventory. Equivalent and substitute parts are identified to provide design flexibility, supply chain alternatives, and component availability options for applications requiring identical electrical and mechanical specifications.

Substiute Parts

MF-USMF175-2

Bourns Inc.In Stock: 1103MF-USMF175-2 Datasheet

Current PartRFQ

MICROSMD175F-2

Littelfuse Inc.In Stock: 16749MICROSMD175F-2 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MF-USMF175-2 is determined by strict alignment of the following critical parameters:

Voltage rating must match at 6V maximum. Current hold (Ih) specification must be 1.75A maximum. Current trip (It) must be 4.6A. Maximum current handling must be 40A. Package and case designation must be 1210 (3225 Metric), Concave. Mounting type must be surface mount. Operating temperature range must encompass -40°C to 85°C. Component type must be polymeric PTC resettable fuse technology.

The MICROSMD175F-2 manufactured by Littelfuse Inc. meets all substitution criteria across these parameters, qualifying it as a direct equivalent for the MF-USMF175-2 in applications requiring identical electrical performance and mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

Both the MF-USMF175-2 and MICROSMD175F-2 are active production components with full regulatory compliance. The MF-USMF175-2 carries cURus and TUV approvals, while the MICROSMD175F-2 carries CSA, TUV, and UL approvals. Both components are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Selection between these parts should be based on supply chain availability, lead time requirements, and existing qualification status within your organization. The MICROSMD175F-2 offers slightly lower post-trip resistance (80 mOhms maximum versus 90 mOhms) and reduced thickness (0.030" versus 0.033"), which may provide marginal advantages in space-constrained applications. The MF-USMF175-2 offers lower initial resistance (20 mOhms minimum versus 25 mOhms), which may be preferable in low-impedance circuit designs.

Frequently Asked Questions (FAQ)

Q: Can MICROSMD175F-2 be used as a direct replacement for MF-USMF175-2?

A: Yes. Both components share identical voltage (6V), current hold (1.75A), current trip (4.6A), maximum current (40A), package designation (1210 Concave), and operating temperature range (-40°C to 85°C). Electrical performance and mechanical compatibility are equivalent.

Q: What are the differences between these two parts?

A: Initial resistance differs slightly (20 mOhms minimum for MF-USMF175-2 versus 25 mOhms for MICROSMD175F-2). Post-trip resistance is lower in the MICROSMD175F-2 (80 mOhms maximum versus 90 mOhms). Component thickness varies (0.033" for MF-USMF175-2 versus 0.030" for MICROSMD175F-2). Approval agencies differ, with MICROSMD175F-2 carrying additional UL certification.

Q: Are there any compliance or certification differences?

A: Both parts are ROHS3 compliant and REACH unaffected. The MF-USMF175-2 holds cURus and TUV approvals. The MICROSMD175F-2 holds CSA, TUV, and UL approvals. Application requirements may dictate which certification set is necessary.

Q: Will the thickness difference affect PCB assembly?

A: The MICROSMD175F-2 is 0.003" (0.09mm) thinner than the MF-USMF175-2. This difference is negligible for standard PCB assembly processes and should not impact reflow soldering, component placement, or board-level clearances in typical applications.

Q: Which part should I select for new designs?

A: Selection should be based on component availability, lead times, and existing supplier relationships. Both parts meet identical electrical and mechanical requirements. Verify that the selected part's certification set aligns with your application's regulatory requirements.