Equivalent & Substitute Parts for 0680L3500-21

Part Overview

The 0680L3500-21 is a 4.6 A surface mount board mount fuse rated for 125 V AC/DC operation, manufactured by Bel Fuse Inc. This component is classified as Active product status and is designed for applications requiring slow blow response characteristics in a 2-SMD, square end block package. Alternative part numbers within the same electrical and mechanical specifications are available to support supply chain flexibility and inventory optimization.

Key Parameters

Parameter	Value
Current Rating	4.6 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

Substitution eligibility for the 0680L3500-21 is determined by the following critical parameters:

Current Rating: 4.6 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 substitute parts 0680L3500-01, 0680L3500-05, and 0680H3500-05 meet all critical electrical and mechanical parameters. Differences in breaking capacity, melting I²t, DC cold resistance, and approval agency certifications do not affect functional interchangeability within the specified electrical operating envelope.

Parameter Comparison

Parameter	0680L3500-21	0680L3500-01	0680L3500-05	0680H3500-05
Manufacturer	Bel Fuse Inc.	Bel Fuse	Bel Fuse Inc.	Bel Fuse Inc.
Current Rating (Amps)	4.6 A	4.6 A	4.6 A	4.6 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
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Breaking Capacity @ Rated Voltage	50A AC, 100A DC	50A AC, 100A DC	50A AC, 100A DC	100A AC, 500A DC
Melting I²t	18	18	18	12
DC Cold Resistance	0.03 Ohms	0.03 Ohms	0.03 Ohms	0.042 Ohms
Approval Agency	AEC-Q200, CE, cURus	AEC-Q200, CE, cURus	AEC-Q200, CE, cURus	cURus
Product Status	Active	Active	Active	Active

Engineering Selection Recommendations

All substitute parts maintain Active product status and ROHS3 compliance. Selection between 0680L3500-21, 0680L3500-01, and 0680L3500-05 is interchangeable from an electrical and mechanical standpoint, as these three parts share identical current ratings, voltage ratings, response characteristics, package dimensions, and approval certifications (AEC-Q200, CE, cURus).

The 0680H3500-05 variant differs in breaking capacity (100A AC, 500A DC versus 50A AC, 100A DC), melting I²t (12 versus 18), and DC cold resistance (0.042 Ohms versus 0.03 Ohms). This part carries cURus certification only, without AEC-Q200 or CE markings. Selection of 0680H3500-05 is appropriate only when the higher breaking capacity specification is required and the reduced approval agency coverage is acceptable for the application.

Frequently Asked Questions (FAQ)

Q: Can 0680L3500-01 and 0680L3500-05 be used interchangeably with 0680L3500-21?

A: Yes. These parts share identical electrical ratings (4.6 A, 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). They are functionally equivalent for board mount fuse applications.

Q: What is the difference between the 0680L and 0680H series?

A: The 0680L series (0680L3500-21, 0680L3500-01, 0680L3500-05) provides breaking capacity of 50A AC and 100A DC with melting I²t of 18 and DC cold resistance of 0.03 Ohms. The 0680H series (0680H3500-05) provides higher breaking capacity of 100A AC and 500A DC with melting I²t of 12 and DC cold resistance of 0.042 Ohms. Both series maintain the same current and voltage ratings.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts (0680L3500-01, 0680L3500-05, 0680H3500-05) are ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited).

Q: Does 0680H3500-05 have the same approval certifications as 0680L3500-21?

A: No. The 0680L3500-21 carries AEC-Q200, CE, and cURus certifications. The 0680H3500-05 carries cURus certification only. Applications requiring AEC-Q200 or CE compliance must use parts from the 0680L series.

Q: Can these fuses be used in both AC and DC circuits?

A: Yes. All parts are rated for 125 V AC and 125 V DC operation with Slow Blow response characteristics suitable for both circuit types within the specified voltage envelope.

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