SMM 10 Equivalent & Substitute Parts Reference

Part Overview

The SMM 10 is a 10 A surface mount board mount fuse rated for 250 V AC and 72 V DC operation, manufactured by Bel Fuse Inc. This component is classified as obsolete, indicating that direct procurement from original inventory may become limited. Identifying equivalent and substitute parts ensures design continuity and supply chain reliability for applications requiring this fuse specification.

Substiute Parts

SMM 10

Bel Fuse Inc.In Stock: 834SMM 10 Datasheet

Current PartRFQ

0678L9100-02

Bel Fuse Inc.In Stock: 218070678L9100-02 Datasheet

DirectRFQ

0678L9250-02

Bel Fuse Inc.In Stock: 391450678L9250-02 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMM 10 are identified based on strict electrical and mechanical compatibility criteria. The following parameters determine substitution eligibility:

• Current Rating: 10 A (primary electrical parameter)
• Voltage Rating - AC: 250 V (primary electrical parameter)
• Voltage Rating - DC: 72 V (primary electrical parameter)
• Mounting Type: Surface Mount (mechanical compatibility)
• Package / Case: 2-SMD, Square End Block (mechanical compatibility)
• Physical Dimensions: 0.386" L x 0.120" W x 0.125" H (PCB footprint compatibility)
• Response Time: Medium Blow (operational characteristic)

The substitute part 0678L9100-02 maintains identical electrical and mechanical specifications to the SMM 10, differing only in packaging format (Tape & Reel versus bulk) and product status (Active versus Obsolete). The part 0678L9250-02 differs in current rating (25 A versus 10 A) and is therefore not a direct substitute but an alternative for higher current applications.

Parameter Comparison

Engineering Selection Recommendations

For applications currently using the SMM 10, the 0678L9100-02 is the direct electrical and mechanical equivalent. This part maintains all critical specifications while offering the advantage of active product status and ROHS3 compliance. The 0678L9100-02 is available in Tape & Reel packaging, which is standard for production environments.

The 0678L9250-02 is not a substitute for the SMM 10 due to its higher current rating (25 A versus 10 A). This part should be selected only for applications requiring 25 A protection at the same voltage levels.

Both substitute parts carry AEC-Q200 certification in addition to cURus approval, providing enhanced reliability documentation compared to the original SMM 10.

Frequently Asked Questions (FAQ)

Q: Can the 0678L9100-02 be used as a direct replacement for the SMM 10?

A: Yes. The 0678L9100-02 is electrically and mechanically equivalent to the SMM 10. Both parts share identical current rating (10 A), voltage ratings (250 V AC, 72 V DC), package type (2-SMD, Square End Block), and physical dimensions. The primary difference is packaging format and product status.

Q: What is the difference between SMM 10 and 0678L9100-02 packaging?

A: The SMM 10 is supplied in bulk packaging, while the 0678L9100-02 is supplied in Tape & Reel (TR) format. Tape & Reel packaging is optimized for automated assembly processes and is the standard format for active production parts.

Q: Why is the SMM 10 marked as obsolete?

A: Obsolete status indicates that the manufacturer has discontinued active production and support for this part number. The 0678L9100-02 represents the active equivalent and is the recommended replacement for new designs and ongoing production.

Q: Can the 0678L9250-02 be used in place of the SMM 10?

A: No. The 0678L9250-02 has a current rating of 25 A, which differs from the SMM 10's 10 A rating. Using a higher-rated fuse in a circuit designed for 10 A protection will compromise circuit protection and is not acceptable for equivalent substitution.

Q: Are there compliance differences between these parts?

A: The 0678L9100-02 and 0678L9250-02 both carry AEC-Q200 certification and ROHS3 compliance, providing enhanced compliance documentation compared to the SMM 10. Both parts maintain cURus approval for safety standards.