MF-USML350/6-2 Equivalent & Substitute Parts

Part Overview

The MF-USML350/6-2 is a Polymeric PTC Resettable Fuse manufactured by Bourns Inc., rated for 6V maximum voltage with 4.6A 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 equivalent parts may be required due to inventory availability, voltage rating requirements, or specific application constraints.

Substiute Parts

MF-USML350/6-2

Bourns Inc.In Stock: 724MF-USML350/6-2 Datasheet

Current PartRFQ

MF-USML350/12-2

Bourns Inc.In Stock: 4030MF-USML350/12-2 Datasheet

UpgradeRFQ

PTSLR12106V350

Eaton - Electronics DivisionIn Stock: 4320PTSLR12106V350 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MF-USML350/6-2 are identified based on the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

• Voltage rating (6V maximum)
• Current hold rating (4.6A)
• Current trip rating (7A)
• Package format (1210 / 3225 Metric, Concave)
• Mounting type (Surface Mount)
• Operating temperature range (-40°C ~ 85°C)

Substitution Categories:

Upgrade Substitute: MF-USML350/12-2 shares identical mechanical packaging, current ratings, and thermal characteristics but features a higher voltage rating of 12V. This part is suitable for applications where the 6V rating is exceeded or where higher voltage margin is required.

Similar Substitute: PTSLR12106V350 from Eaton - Electronics Division matches the 6V voltage rating, 4.6A hold current, and identical package specifications. Minor variations exist in time-to-trip (2s vs 5s) and post-trip resistance characteristics, which remain within acceptable operational parameters for equivalent functionality.

Parameter Comparison

Engineering Selection Recommendations

MF-USML350/12-2 (Upgrade Substitute): This Bourns part maintains full compatibility with the original MF-USML350/6-2 in terms of package, mounting, and current characteristics. The 12V voltage rating provides additional margin for applications operating above 6V. Both parts carry Active product status and meet ROHS3 compliance with cURus and TUV certifications. Selection of this upgrade is appropriate when circuit voltage requirements exceed the 6V specification.

PTSLR12106V350 (Similar Substitute): This Eaton part provides direct voltage and current rating equivalence to the original MF-USML350/6-2. Mechanical compatibility is confirmed through identical package specifications. Both parts maintain Active product status and ROHS3 compliance. The PTSLR12106V350 carries cURus and TUV approvals. The faster trip time (2s vs 5s) and slightly different resistance characteristics represent minor operational variations that remain within acceptable parameters for equivalent circuit protection functionality.

Frequently Asked Questions (FAQ)

Q: Can MF-USML350/12-2 be used as a direct replacement for MF-USML350/6-2?

A: Yes. The MF-USML350/12-2 is mechanically and electrically compatible for direct substitution. The higher 12V rating does not prevent operation in 6V circuits; it provides additional voltage margin. Current ratings, package format, and thermal characteristics are identical.

Q: What is the primary difference between MF-USML350/6-2 and PTSLR12106V350?

A: Both parts share identical voltage (6V), current hold (4.6A), and package specifications. The PTSLR12106V350 exhibits a faster trip time of 2 seconds compared to 5 seconds for the MF-USML350/6-2, and minor variations in initial and post-trip resistance values. These differences do not affect functional equivalence for overcurrent protection applications.

Q: Are all substitute parts available in the same packaging format?

A: Yes. All listed substitute parts are supplied in 1210 (3225 Metric) Concave package format with Surface Mount mounting type, ensuring PCB footprint compatibility.

Q: Do substitute parts meet the same compliance standards?

A: All substitute parts are ROHS3 compliant and carry cURus and TUV certifications. The MF-USML350/12-2 includes additional cUL approval. All parts maintain Active product status.

Q: Which substitute should be selected for maximum inventory availability?

A: The MF-USML350/12-2 offers the highest inventory level at 3970 pieces. The PTSLR12106V350 provides 4275 pieces. Both exceed the original part's 681 pieces in stock.