MF-USML500-2 PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The MF-USML500-2 is a Polymeric PTC Resettable Fuse manufactured by Bourns Inc., rated for 6V at 5A hold current in a 1210 (3225 Metric) surface mount package. This part is classified as Obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement planning. The MF-USML series provides overcurrent protection with automatic reset capability across industrial and consumer applications requiring compact form factors.

Substiute Parts

MF-USML500-2

Bourns Inc.In Stock: 818MF-USML500-2 Datasheet

Current PartRFQ

MF-USML500/6-2

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

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MF-USML500-2 is determined by strict equivalence across the following critical parameters:

• Voltage rating: 6V maximum
• Current hold (Ih): 5A maximum
• Current trip (It): 10A
• Package / Case: 1210 (3225 Metric), Concave surface mount
• Mounting type: Surface mount
• Operating temperature range: -40°C ~ 85°C
• Regulatory compliance: cURus and TUV approval

The MF-USML500/6-2 meets all substitution criteria as a direct functional equivalent. Both parts share identical voltage, current hold, trip characteristics, package geometry, and thermal operating range. The primary distinction is product status and packaging format.

Parameter Comparison

Engineering Selection Recommendations

The MF-USML500/6-2 is the direct substitute for the obsolete MF-USML500-2. Both parts maintain identical electrical specifications, thermal performance, and regulatory certifications (cURus, TUV). The MF-USML500/6-2 carries Active product status, ensuring continued availability and manufacturing support. Post-trip resistance (R1) of the substitute is 12 mOhms compared to 14.5 mOhms on the original part, representing improved performance within acceptable tolerance margins. Both parts are ROHS3 compliant and carry equivalent moisture sensitivity ratings. Selection of the MF-USML500/6-2 is appropriate for new designs and legacy system updates requiring this protection rating and package format.

Frequently Asked Questions (FAQ)

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

A: Yes. Both parts share identical voltage (6V), current hold (5A), current trip (10A), package geometry (1210 Concave), and operating temperature range (-40°C ~ 85°C). Electrical performance is equivalent for overcurrent protection applications.

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

A: The primary differences are product status and packaging format. MF-USML500-2 is Obsolete and supplied in bulk packaging. MF-USML500/6-2 is Active and supplied in Tape & Reel format. Post-trip resistance differs slightly (14.5 mOhms vs. 12 mOhms), with the substitute offering lower resistance.

Q: Are both parts certified for the same regulatory standards?

A: Yes. Both MF-USML500-2 and MF-USML500/6-2 carry cURus and TUV approvals and are ROHS3 compliant.

Q: What does the packaging format difference mean for procurement?

A: MF-USML500-2 is supplied in bulk form, while MF-USML500/6-2 is supplied in Tape & Reel format. Tape & Reel packaging is standard for automated assembly processes and is the current manufacturing format for this product line.

Q: Can these parts be used interchangeably in surface mount assembly?

A: Yes. Both parts are surface mount components with identical 1210 (3225 Metric) package dimensions and concave geometry, compatible with standard SMT assembly equipment and processes.