MF-USML380-2 Polymeric PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The Bourns MF-USML380-2 is a polymeric PTC resettable fuse rated for 6V at 3.8A hold current, designed for surface mount applications in the 1210 (3225 Metric) package. This component provides overcurrent protection with automatic recovery capability. The MF-USML380-2 is classified as obsolete, making identification of active equivalent parts essential for ongoing design support and procurement continuity.

Substiute Parts

MF-USML380-2

Bourns Inc.In Stock: 993MF-USML380-2 Datasheet

Current PartRFQ

MF-USML380/6-2

Bourns Inc.In Stock: 769MF-USML380/6-2 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for polymeric PTC resettable fuses is determined by the following critical parameters:

• Voltage rating must equal or exceed the original specification (6V minimum)
• Hold current (Ih) must match the original rating (3.8A)
• Package and mounting type must be identical (1210 Surface Mount)
• Operating temperature range must encompass the original range (-40°C ~ 85°C)
• Polymeric type classification must be maintained

The MF-USML380/6-2 meets all substitution criteria as an active product variant within the same Multifuse series, offering direct functional equivalence with updated specifications.

Parameter Comparison

Engineering Selection Recommendations

The MF-USML380/6-2 is the direct active equivalent for the obsolete MF-USML380-2. Both components maintain identical voltage, hold current, and package specifications. The substitute part carries active product status from Bourns Inc., ensuring ongoing availability and supply chain continuity.

Both parts maintain equivalent regulatory compliance with cURus and TUV approvals, ROHS3 compliance, and identical moisture sensitivity ratings. The MF-USML380/6-2 is available in Tape & Reel packaging, supporting automated assembly processes.

Minor parameter variations exist in trip current (7.6A vs 8A) and post-trip resistance (20 mOhms vs 16 mOhms maximum), which remain within acceptable tolerance for polymeric PTC fuse operation and do not affect functional compatibility in standard overcurrent protection applications.

Frequently Asked Questions (FAQ)

Q: Can MF-USML380/6-2 be used as a direct replacement for MF-USML380-2?

A: Yes. Both components share identical voltage rating (6V), hold current (3.8A), package type (1210 Surface Mount), and operating temperature range (-40°C ~ 85°C). The substitute is an active product with current manufacturing support.

Q: What are the differences between these two parts?

A: The primary differences are product status (obsolete vs. active), trip current specification (8A vs. 7.6A), and post-trip resistance maximum (16 mOhms vs. 20 mOhms). These variations are within normal polymeric PTC fuse tolerance and do not affect substitution eligibility.

Q: Are there packaging differences?

A: The MF-USML380-2 packaging is not specified in available data. The MF-USML380/6-2 is supplied in Tape & Reel format, standard for automated surface mount assembly. Both use identical 1210 (3225 Metric) package geometry.

Q: Do both parts meet the same regulatory requirements?

A: Yes. Both components carry cURus and TUV approvals, maintain ROHS3 compliance, and share identical moisture sensitivity levels (2A, 4 Weeks). Regulatory and environmental compliance is equivalent.

Q: Why is the original part obsolete?

A: Product obsolescence reflects manufacturing lifecycle decisions by Bourns Inc. The MF-USML380/6-2 represents the current active equivalent within the Multifuse series, providing continued support for this protection function.