MF-USML500/6-2 Equivalent & Substitute Parts

Part Overview

The MF-USML500/6-2 is a Polymeric PTC Resettable Fuse manufactured by Bourns Inc., rated for 6V maximum voltage with 5A hold current. This component is classified as Active product status and is designed for surface mount applications in the 1210 (3225 Metric) package format. PTC resettable fuses provide automatic overcurrent protection by increasing resistance when excessive current is detected, then resetting when the fault condition is cleared. Alternative models may be required due to inventory constraints, voltage rating requirements for different circuit designs, or manufacturer preference in supply chain management.

Substiute Parts

MF-USML500/6-2

Bourns Inc.In Stock: 1251MF-USML500/6-2 Datasheet

Current PartRFQ

MF-USML500/12-2

Bourns Inc.In Stock: 3864MF-USML500/12-2 Datasheet

UpgradeRFQ

PTSLR12106V500

Eaton - Electronics DivisionIn Stock: 2004PTSLR12106V500 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MF-USML500/6-2 are identified based on the following critical parameters that determine functional compatibility:

Electrical Parameters: Current hold rating (Ih), current trip rating (It), maximum current rating, and time to trip characteristics must remain consistent to ensure equivalent overcurrent protection behavior.

Mechanical Parameters: Package type (1210/3225 Metric), mounting type (Surface Mount), and physical dimensions must match to ensure PCB compatibility and assembly process alignment.

Environmental Parameters: Operating temperature range and moisture sensitivity level must be maintained for reliability in the target application environment.

Compliance Parameters: RoHS status and regulatory approvals must be equivalent or superior to the original specification.

The MF-USML500/6-2 has two identified substitute options: an upgraded voltage variant within the same Bourns product family (MF-USML500/12-2) and a functionally equivalent part from an alternative manufacturer (PTSLR12106V500 from Eaton).

Parameter Comparison

Engineering Selection Recommendations

MF-USML500/12-2 (Bourns Inc.): This part is functionally equivalent to the MF-USML500/6-2 with identical electrical characteristics for current protection (5A hold, 10A trip). The primary difference is the elevated maximum voltage rating of 12V versus 6V. This part is suitable for applications where higher voltage tolerance is required or beneficial. Both parts share identical mechanical specifications, operating temperature range, and compliance certifications. The MF-USML500/12-2 carries additional cUL approval. Both parts maintain Active product status and ROHS3 compliance.

PTSLR12106V500 (Eaton - Electronics Division): This part provides electrical equivalence to the MF-USML500/6-2 with matching voltage (6V), current hold (5A), and trip characteristics (10A). Physical and thermal specifications are identical. The initial resistance specification differs slightly (2 mOhms minimum versus 1 mOhms minimum for the Bourns part), while post-trip resistance remains at 12 mOhms maximum. Both parts are Active status, ROHS3 compliant, and carry cURus and TUV approvals. This part represents a direct functional alternative from a different manufacturer.

Frequently Asked Questions (FAQ)

Q: Can MF-USML500/12-2 be used as a direct replacement for MF-USML500/6-2?

A: The MF-USML500/12-2 is mechanically and electrically compatible for overcurrent protection function. The 12V maximum voltage rating is a superset of the 6V requirement, meaning it will operate correctly in 6V circuits. However, the circuit design must accommodate the higher voltage rating. Both parts share identical current protection characteristics (5A hold, 10A trip) and physical dimensions.

Q: What is the difference between MF-USML500/6-2 and PTSLR12106V500?

A: Both parts provide equivalent 6V, 5A hold current protection in the same 1210 package. The primary difference is manufacturer: Bourns versus Eaton. The PTSLR12106V500 has a minimum initial resistance of 2 mOhms compared to 1 mOhms for the Bourns part. Both maintain identical post-trip resistance (12 mOhms maximum) and trip characteristics.

Q: Are all three parts interchangeable on the same PCB?

A: MF-USML500/6-2 and PTSLR12106V500 are direct mechanical and electrical substitutes. MF-USML500/12-2 is mechanically compatible but has a higher voltage rating. All three parts use identical 1210 (3225 Metric) surface mount packages with matching dimensions and concave geometry, ensuring PCB footprint compatibility.

Q: Do all substitute parts meet the same compliance requirements?

A: All three parts are ROHS3 compliant and carry cURus and TUV approvals. MF-USML500/12-2 includes additional cUL certification. All parts maintain 2A (4 Weeks) moisture sensitivity level and are classified as Active product status.

Q: What is the significance of the 1 mOhms versus 2 mOhms initial resistance difference?

A: Initial resistance (Ri) affects the voltage drop across the fuse during normal operation. The MF-USML500/6-2 and MF-USML500/12-2 specify 1 mOhms minimum, while PTSLR12106V500 specifies 2 mOhms minimum. This difference may impact power dissipation and circuit performance in applications with tight voltage margin requirements.