MF-USML300/6-2 Equivalent & Substitute Parts

Part Overview

The MF-USML300/6-2 is a Polymeric PTC Resettable Fuse manufactured by Bourns Inc., rated for 6V maximum voltage with 3A 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 specific performance characteristics needed for particular applications.

Substiute Parts

MF-USML300/6-2

Bourns Inc.In Stock: 4030MF-USML300/6-2 Datasheet

Current PartRFQ

MF-USML300/12-2

Bourns Inc.In Stock: 9848MF-USML300/12-2 Datasheet

UpgradeRFQ

PTSLR12106V300

Eaton - Electronics DivisionIn Stock: 4107PTSLR12106V300 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MF-USML300/6-2 are identified based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

• Polymeric PTC resettable fuse type
• Surface mount 1210 (3225 Metric) package with concave configuration
• Current hold rating of 3A maximum
• Operating temperature range of -40°C to 85°C
• RoHS3 compliance and MSL 2A rating

Voltage Rating Consideration: The MF-USML300/6-2 operates at 6V maximum. Substitute parts may have different voltage ratings (such as 12V) while maintaining identical mechanical and electrical hold/trip characteristics. A higher voltage-rated component can function in a 6V circuit but represents an upgrade in voltage capability.

Substitute Categories:

1. Upgrade Substitute (Same Manufacturer): MF-USML300/12-2 - Identical to the main part except for 12V maximum voltage rating, maintaining all other electrical and mechanical specifications.

2. Similar Substitute (Different Manufacturer): PTSLR12106V300 - Eaton Electronics Division equivalent with matching 6V voltage rating, 3A hold current, and 1210 package, with minor variations in post-trip resistance and trip time specifications.

Parameter Comparison

Engineering Selection Recommendations

MF-USML300/12-2 (Bourns Inc. Upgrade Substitute): This part is suitable for direct substitution in applications where higher voltage tolerance is acceptable or required. Both components share identical mechanical packaging, hold current ratings, and thermal operating ranges. The upgrade to 12V maximum voltage provides additional design margin for circuits operating at or near 6V. Both parts maintain Active product status and ROHS3 compliance with equivalent certifications (cUL, cURus, TUV).

PTSLR12106V300 (Eaton Electronics Division Similar Substitute): This part provides functional equivalence at the 6V voltage rating with identical current hold and trip specifications. The component maintains the same 1210 package footprint and surface mount configuration. Differences include a faster trip time (2 seconds versus 5 seconds) and lower post-trip resistance (20 mOhms maximum versus 24 mOhms maximum). Both parts are Active status with ROHS3 compliance and equivalent thermal ratings. Selection between Bourns and Eaton variants depends on circuit-specific trip time requirements and post-trip resistance tolerance.

Frequently Asked Questions (FAQ)

Q: Can MF-USML300/12-2 be used as a direct replacement for MF-USML300/6-2?

A: Yes. The MF-USML300/12-2 maintains identical mechanical packaging (1210 concave), current hold rating (3A), trip current (6A), and operating temperature range (-40°C to 85°C). The 12V voltage rating is compatible with 6V circuits and provides additional voltage margin. Both components are Bourns Multifuse series with Active status and ROHS3 compliance.

Q: What is the difference between MF-USML300/6-2 and PTSLR12106V300?

A: Both components share the same 6V voltage rating, 3A hold current, 6A trip current, and 1210 package configuration. The PTSLR12106V300 has a faster trip time (2 seconds versus 5 seconds) and lower maximum post-trip resistance (20 mOhms versus 24 mOhms). The PTSLR12106V300 is manufactured by Eaton Electronics Division rather than Bourns. Both are Active status with ROHS3 compliance.

Q: Are all three parts mechanically interchangeable?

A: Yes. All three parts use the 1210 (3225 Metric) surface mount package with concave configuration, identical dimensions (0.127" L x 0.101" W, 3.22mm x 2.58mm), and maximum thickness of 0.047" (1.20mm). They are directly interchangeable on PCB layouts designed for this package format.

Q: Which substitute should I select for a 12V circuit?

A: The MF-USML300/12-2 is the appropriate selection for 12V circuits, as it is rated for 12V maximum voltage while maintaining all other specifications identical to the 6V-rated main part. The PTSLR12106V300 is rated for 6V maximum and would not be suitable for 12V applications.

Q: Do all parts have the same compliance certifications?

A: All three parts are ROHS3 compliant with MSL 2A (4 Weeks) rating. The MF-USML300/6-2 and PTSLR12106V300 carry cURus and TUV approvals. The MF-USML300/12-2 carries cUL, cURus, and TUV approvals, providing additional certification coverage.