SMM 15 Surface Mount Fuse - Equivalent & Substitute Parts

Part Overview

The SMM 15 is a 15 A, 250 V AC / 72 V DC surface mount board fuse manufactured by Bel Fuse Inc. This component is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and production continuity. The SMM 15 operates as a medium-blow fuse in a 2-SMD square end block package, suitable for circuit protection in applications requiring both AC and DC voltage ratings.

Substiute Parts

SMM 15

Bel Fuse Inc.In Stock: 693SMM 15 Datasheet

Current PartRFQ

0678L9150-02

Bel Fuse Inc.In Stock: 420600678L9150-02 Datasheet

DirectRFQ

0678L9300-02

Bel Fuse Inc.In Stock: 1915650678L9300-02 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMM 15 are identified based on strict electrical and mechanical compatibility criteria. The following parameters must remain constant for direct substitution:

• Current Rating: 15 A
• Voltage Rating - AC: 250 V
• Voltage Rating - DC: 72 V
• Mounting Type: Surface Mount
• Package / Case: 2-SMD, Square End Block
• Physical Dimensions: 0.386" L x 0.120" W x 0.125" H
• Response Time: Medium Blow
• Operating Temperature Range: -55°C ~ 125°C

The substitute part 0678L9150-02 meets all these criteria and is classified as a direct equivalent. The part 0678L9300-02 differs in current rating (30 A instead of 15 A) and is therefore not a direct substitute but an alternative for higher current applications.

Parameter Comparison

Engineering Selection Recommendations

For direct replacement of the obsolete SMM 15, the part 0678L9150-02 is the appropriate selection. This part maintains identical electrical specifications (15 A, 250 V AC, 72 V DC) and mechanical compatibility while offering the advantage of active product status and AEC-Q200 automotive qualification. The 0678L9150-02 is available in Tape & Reel packaging with significantly higher inventory availability (42,003 units).

The part 0678L9300-02 is not suitable as a direct substitute due to its 30 A current rating, which exceeds the original specification. Selection of this part would require circuit redesign and is applicable only to applications requiring higher current protection.

Frequently Asked Questions (FAQ)

Q: Can 0678L9150-02 be used as a direct replacement for SMM 15?

A: Yes. The 0678L9150-02 is electrically and mechanically equivalent to the SMM 15, with identical current rating (15 A), voltage ratings (250 V AC / 72 V DC), package type (2-SMD square end block), and physical dimensions. The primary difference is product status (active vs. obsolete) and packaging format.

Q: What is the difference between 0678L9150-02 and 0678L9300-02?

A: The 0678L9150-02 maintains the 15 A current rating of the original SMM 15. The 0678L9300-02 has a 30 A current rating and is not a substitute but an alternative for applications requiring higher current protection. These parts are not interchangeable.

Q: Are there packaging differences between the substitute parts?

A: Yes. The SMM 15 is supplied in standard packaging. The 0678L9150-02 is available in Tape & Reel format. The 0678L9300-02 is available in Cut Tape and Digi-Reel format. Packaging selection depends on production volume and assembly requirements.

Q: Does 0678L9150-02 have additional certifications?

A: The 0678L9150-02 includes AEC-Q200 automotive qualification in addition to CE and cURus approvals. This provides enhanced qualification for automotive and high-reliability applications.

Q: Are the DC cold resistance values identical?

A: The SMM 15 and 0678L9150-02 both have 0.0036 Ohms DC cold resistance. The 0678L9300-02 has 0.0013 Ohms due to its higher current rating.