MF-USML230-2 Equivalent & Substitute Parts

Part Overview

The MF-USML230-2 is a Polymeric PTC Resettable Fuse manufactured by Bourns Inc., rated for 6V maximum voltage with a 2.3A hold current. This component is classified as Obsolete, making identification of compatible substitute parts essential for ongoing design support and procurement planning. The part is designed for surface mount applications in the 1210 (3225 Metric) package format with concave geometry.

Substiute Parts

MF-USML230-2

Bourns Inc.In Stock: 1197MF-USML230-2 Datasheet

Current PartRFQ

MF-USML260/6-2

Bourns Inc.In Stock: 1205MF-USML260/6-2 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MF-USML230-2 is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

• Voltage Rating: 6V maximum (must not be lower)
• Package Format: 1210 (3225 Metric), Concave geometry
• Mounting Type: Surface Mount
• Operating Temperature Range: -40°C ~ 85°C
• Regulatory Compliance: cURus and TUV approval

Allowable Variation Parameters:

• Current - Hold (Ih): Substitute parts may have higher hold current ratings, provided the trip current (It) remains proportionally scaled
• Resistance - Initial (Ri) and Post Trip (R1): Minor variations acceptable within the polymeric PTC fuse design envelope
• Time to Trip: Variations acceptable based on hold current rating differences

The MF-USML260/6-2 qualifies as a direct substitute based on identical voltage rating, package geometry, mounting type, and regulatory approvals, with a higher hold current rating of 2.6A and corresponding trip current of 5.2A.

Parameter Comparison

Engineering Selection Recommendations

The MF-USML260/6-2 is the qualified substitute for the obsolete MF-USML230-2. Selection is based on the following engineering criteria:

Product Status Alignment: The MF-USML260/6-2 carries Active product status, ensuring ongoing availability and manufacturing support, whereas the MF-USML230-2 is Obsolete.

Regulatory Compliance: Both parts maintain identical approval certifications (cURus, TUV), ROHS3 compliance, and REACH Unaffected status, ensuring no regulatory substitution barriers.

Electrical Compatibility: The substitute part operates at the same 6V maximum voltage rating with proportionally scaled current characteristics (2.6A hold vs. 2.3A hold, 5.2A trip vs. 4.6A trip). The higher hold current rating of the substitute provides equivalent or improved circuit protection performance.

Mechanical Compatibility: Both parts share identical package geometry (1210 / 3225 Metric, Concave), surface mount mounting type, and equivalent dimensional footprints. The thickness difference (0.031" vs. 0.024") is within typical PCB assembly tolerances for surface mount components.

Environmental Specifications: Operating temperature range, moisture sensitivity level, and thermal characteristics remain unchanged, ensuring functional equivalence in target applications.

Frequently Asked Questions (FAQ)

Q: Can the MF-USML260/6-2 be used as a direct replacement for the MF-USML230-2 in existing designs?

A: Yes. Both parts share identical voltage ratings (6V), package geometry (1210 Concave), mounting type (Surface Mount), and regulatory approvals (cURus, TUV). The substitute part has a higher hold current rating (2.6A vs. 2.3A) with proportionally scaled trip current (5.2A vs. 4.6A), maintaining circuit protection functionality.

Q: What is the difference in hold current between these parts?

A: The MF-USML230-2 has a maximum hold current of 2.3A, while the MF-USML260/6-2 has a maximum hold current of 2.6A. The trip current scales proportionally (4.6A vs. 5.2A). This difference reflects the polymeric PTC fuse design envelope and does not affect substitution compatibility.

Q: Are there packaging differences between the main part and substitute?

A: Both parts are supplied in the same 1210 (3225 Metric) package with concave geometry. The MF-USML260/6-2 is available in Tape & Reel (TR) packaging, whereas the MF-USML230-2 packaging format is not specified. Thickness varies slightly (0.031" vs. 0.024"), which is within standard PCB assembly tolerances.

Q: Why is the MF-USML230-2 classified as Obsolete?

A: The MF-USML230-2 has reached end-of-life status. The MF-USML260/6-2 is the active equivalent part from Bourns Inc. and is recommended for new designs and ongoing procurement.

Q: Do both parts meet the same regulatory requirements?

A: Yes. Both the MF-USML230-2 and MF-USML260/6-2 carry cURus and TUV approvals, are ROHS3 compliant, and have REACH Unaffected status. Regulatory substitution is fully supported.

Q: What is the time-to-trip difference, and does it affect substitution?

A: The MF-USML230-2 has a time-to-trip of 4.6 seconds, while the MF-USML260/6-2 has 5 seconds. This variation is inherent to the higher current rating of the substitute part and reflects standard polymeric PTC fuse behavior. Both parts provide equivalent circuit protection within their respective current ratings.