Equivalent & Substitute Parts for 0680L9120-21

Part Overview

The 0680L9120-21 is a 12 A, 50 V AC / 75 V DC board mount surface mount fuse manufactured by Bel Fuse Inc. This slow blow fuse is designed for SMD applications with a 2-SMD square end block package configuration. The part is currently active in production with full compliance to automotive and industrial standards including AEC-Q200, CE, and cURus certifications. Identifying equivalent substitute parts ensures design flexibility, supply chain continuity, and access to alternative inventory levels when the primary part number becomes unavailable.

Substiute Parts

0680L9120-21

Bel Fuse Inc.In Stock: 8360680L9120-21 Datasheet

Current PartRFQ

0680L9120-05

Bel Fuse Inc.In Stock: 158520680L9120-05 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The 0680L9120-21 has one parametric equivalent substitute: 0680L9120-05. Both parts are classified as equivalent substitutes because they share identical electrical and mechanical specifications across all critical parameters that determine functional interchangeability in board mount fuse applications.

The substitution is valid based on the following key parameters:

• Current Rating: 12 A (identical)
• Voltage Rating: 50 V AC / 75 V DC (identical)
• Response Time: Slow Blow (identical)
• Mounting Type: Surface Mount (identical)
• Package / Case: 2-SMD, Square End Block (identical)
• Fuse Type: Board Mount (Cartridge Style Excluded) (identical)
• Breaking Capacity: 100A AC, 500A DC (identical)
• Melting I²t: 244 (identical)
• Physical Dimensions: 0.240" L x 0.100" W x 0.100" H (identical)
• DC Cold Resistance: 0.0063 Ohms (identical)
• Operating Temperature Range: -55°C ~ 125°C (identical)
• Approval Certifications: AEC-Q200, CE, cURus (identical)
• RoHS Compliance: ROHS3 Compliant (identical)

Both parts belong to the 0680L series and maintain identical performance characteristics, thermal behavior, and regulatory compliance profiles.

Parameter Comparison

Engineering Selection Recommendations

Both the 0680L9120-21 and 0680L9120-05 are active production parts from Bel Fuse Inc. with identical electrical, mechanical, and compliance specifications. Selection between these parts should be based on inventory availability and supply chain considerations rather than technical performance differences.

The 0680L9120-05 currently maintains higher inventory levels (15,811 pieces) compared to the 0680L9120-21 (759 pieces), making it a viable alternative when supply constraints exist. Both parts maintain full compliance with AEC-Q200, CE, and cURus certifications, ensuring suitability for automotive and industrial applications. Both parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can 0680L9120-05 be used as a direct replacement for 0680L9120-21?

A: Yes. Both parts are parametric equivalents with identical electrical ratings (12 A, 50 V AC / 75 V DC), response characteristics (slow blow), mechanical packaging (2-SMD square end block), and physical dimensions (0.240" L x 0.100" W x 0.100" H). They are functionally interchangeable in all board mount surface mount fuse applications.

Q: Are there any differences in certification or compliance between these parts?

A: No. Both parts carry identical certifications: AEC-Q200, CE, and cURus. Both are ROHS3 compliant with MSL rating of 1 (unlimited moisture sensitivity level). Regulatory and compliance profiles are identical.

Q: What is the difference between the two part numbers if they are equivalent?

A: The part numbers differ in their packaging or distribution designation, but the electrical and mechanical specifications are identical. Both parts belong to the 0680L series and maintain the same performance characteristics, thermal behavior, and breaking capacity (100A AC, 500A DC).

Q: Can these parts be used interchangeably in PCB assembly?

A: Yes. Both parts use identical 2-SMD square end block packaging with the same physical dimensions and mounting type (surface mount). They are compatible with the same PCB footprints and assembly processes.

Q: What is the melting I²t value and why is it important?

A: The melting I²t value for both parts is 244. This parameter defines the thermal energy required to melt the fuse element and is critical for ensuring proper overcurrent protection coordination in circuit designs. Identical I²t values confirm equivalent protection characteristics.

Q: Are both parts suitable for automotive applications?

A: Yes. Both parts carry AEC-Q200 certification, which is the automotive electronics council qualification standard. This certification confirms suitability for automotive-grade reliability and performance requirements.