0680L1000-21 Equivalent & Substitute Parts

Part Overview

The 0680L1000-21 is a 1 A, 125 V AC/DC surface mount board mount fuse manufactured by Bel Fuse Inc. in a 2-SMD, Square End Block package. This fuse is classified as Active product status and is designed for applications requiring slow blow response characteristics with board-level mounting. Substitute parts are identified when equivalent electrical ratings, mechanical dimensions, and package specifications align with the original component, enabling direct replacement in circuit designs without functional compromise.

Key Parameters

Parameter	Value
Current Rating	1 A
Voltage Rating (AC)	125 V
Voltage Rating (DC)	125 V
Response Time	Slow Blow
Mounting Type	Surface Mount
Package / Case	2-SMD, Square End Block
Size / Dimension	0.240" L x 0.100" W x 0.100" H (6.10mm x 2.54mm x 2.54mm)
Operating Temperature Range	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the 0680L1000-21 are identified based on the following critical parameters that determine functional equivalence:

Current Rating: 1 A (exact match required)
Voltage Rating: 125 V AC and 125 V DC (exact match required)
Response Time: Slow Blow (exact match required)
Mounting Type: Surface Mount (exact match required)
Package / Case: 2-SMD, Square End Block (exact match required)
Physical Dimensions: 0.240" L x 0.100" W x 0.100" H (exact match required)
Operating Temperature Range: -55°C ~ 125°C (exact match required)
RoHS Compliance: ROHS3 Compliant (exact match required)

The 0680L1000-21 belongs to the 0680L series. Substitute parts within this series maintain identical electrical and mechanical specifications, ensuring direct interchangeability. The 0680H1000-05 represents a parametric equivalent from the 0680H series with identical primary electrical ratings and package specifications but differs in breaking capacity and melting I²t characteristics.

Parameter Comparison

Parameter	0680L1000-21	0680L1000-01	0680L1000-05	0680H1000-05
Manufacturer	Bel Fuse Inc.	Bel Fuse	Bel Fuse Inc.	Bel Fuse Inc.
Current Rating (Amps)	1 A	1 A	1 A	1 A
Voltage Rating - AC	125 V	125 V	125 V	125 V
Voltage Rating - DC	125 V	125 V	125 V	125 V
Response Time	Slow Blow	Slow Blow	Slow Blow	Slow Blow
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	2-SMD, Square End Block	2-SMD, Square End Block	2-SMD, Square End Block	2-SMD, Square End Block
Size / Dimension	0.240" L x 0.100" W x 0.100" H (6.10mm x 2.54mm x 2.54mm)	0.240" L x 0.100" W x 0.100" H (6.10mm x 2.54mm x 2.54mm)	0.240" L x 0.100" W x 0.100" H (6.10mm x 2.54mm x 2.54mm)	0.240" L x 0.100" W x 0.100" H (6.10mm x 2.54mm x 2.54mm)
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Breaking Capacity @ Rated Voltage (AC)	50A	50A	50A	100A
Breaking Capacity @ Rated Voltage (DC)	100A	100A	100A	500A
Melting I²t	1.5	1.5	1.5	0.79
DC Cold Resistance	0.175 Ohms	0.175 Ohms	0.175 Ohms	0.33 Ohms
Approval Agency	AEC-Q200, CE, cURus	AEC-Q200, CE, cURus	AEC-Q200, CE, cURus	cURus
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Active

Engineering Selection Recommendations

The 0680L1000-01 and 0680L1000-05 are direct substitutes for the 0680L1000-21, sharing identical electrical ratings, mechanical dimensions, response characteristics, and approval certifications including AEC-Q200, CE, and cURus compliance. These parts are interchangeable at the circuit design level with no functional differences.

The 0680H1000-05 is a parametric equivalent that maintains identical primary electrical specifications (1 A, 125 V AC/DC, Slow Blow, 2-SMD package) and physical dimensions. However, this part differs in breaking capacity (100A AC / 500A DC versus 50A AC / 100A DC) and melting I²t (0.79 versus 1.5), with reduced DC cold resistance (0.33 Ohms versus 0.175 Ohms). The 0680H1000-05 carries cURus approval only, lacking AEC-Q200 and CE certifications present in the 0680L series. Selection of the 0680H1000-05 requires verification that the enhanced breaking capacity and altered thermal response characteristics align with application requirements.

Frequently Asked Questions (FAQ)

Q: Can 0680L1000-01 and 0680L1000-05 be used interchangeably with 0680L1000-21?

A: Yes. These parts share identical current ratings (1 A), voltage ratings (125 V AC/DC), response time (Slow Blow), mounting type (Surface Mount), package configuration (2-SMD, Square End Block), physical dimensions (0.240" L x 0.100" W x 0.100" H), operating temperature range (-55°C ~ 125°C), and approval certifications (AEC-Q200, CE, cURus). Direct substitution is supported.

Q: What are the differences between the 0680L and 0680H series?

A: The 0680L and 0680H series differ in breaking capacity and melting I²t characteristics. The 0680L series (including 0680L1000-21) provides 50A AC / 100A DC breaking capacity with 1.5 melting I²t. The 0680H series (0680H1000-05) provides 100A AC / 500A DC breaking capacity with 0.79 melting I²t. The 0680H series also has higher DC cold resistance (0.33 Ohms versus 0.175 Ohms) and carries only cURus approval, lacking AEC-Q200 and CE certifications.

Q: Is the 0680H1000-05 a direct substitute for 0680L1000-21?

A: The 0680H1000-05 is a parametric equivalent with matching primary electrical ratings and package specifications. However, differences in breaking capacity, melting I²t, and approval certifications require application-level assessment before substitution.

Q: What packaging format is used for these fuses?

A: All listed parts are supplied in Tape & Reel (TR) packaging for automated assembly processes. The physical package is 2-SMD, Square End Block configuration with dimensions 0.240" L x 0.100" W x 0.100" H (6.10mm x 2.54mm x 2.54mm).

Q: Are these fuses RoHS compliant?

A: Yes. All listed parts are ROHS3 Compliant and carry Moisture Sensitivity Level 1 (Unlimited), indicating no moisture sensitivity restrictions during storage and handling.

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