0680L6300-21 Surface Mount Board Fuse Equivalent & Substitute Parts

Part Overview

The 0680L6300-21 is a 6.3 A, 125 V AC/DC surface mount board fuse manufactured by Bel Fuse Inc. in the 0680L series. This slow blow fuse is designed for board mount applications in a 2-SMD, square end block package. The part is active in production and widely stocked, with 887 pieces currently available. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, and functional characteristics to ensure direct compatibility in circuit protection applications.

Substiute Parts

0680L6300-21

Bel Fuse Inc.In Stock: 9700680L6300-21 Datasheet

Current PartRFQ

0680H6300-05

Bel Fuse Inc.In Stock: 45380680H6300-05 Datasheet

Parametric EquivalentRFQ

0680L6300-01

Bel FuseIn Stock: 54160680L6300-01 Datasheet

Parametric EquivalentRFQ

0680L6300-05

Bel FuseIn Stock: 414590680L6300-05 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 0680L6300-21 are identified based on the following critical parameters that determine functional interchangeability:

• Current Rating: 6.3 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)

The substitute parts listed below meet all these criteria. Variations in breaking capacity, melting I²t, DC cold resistance, and approval agencies do not prevent substitution when the primary electrical and mechanical parameters are identical.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts listed are active production components with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1). Selection among the substitutes should be based on the following factors:

0680L6300-01 and 0680L6300-05: Both are from the 0680L series with identical electrical characteristics, breaking capacity, melting I²t, and DC cold resistance to the main part 0680L6300-21. Both carry AEC-Q200, CE, and cURus certifications. The 0680L6300-05 has significantly higher inventory availability (41,434 pieces) compared to 0680L6300-01 (5,386 pieces).

0680H6300-05: This part is from the 0680H series and offers higher breaking capacity (100 A AC, 500 A DC versus 50 A AC, 100 A DC). It carries cURus certification but lacks AEC-Q200 and CE certifications present in the main part. The melting I²t is lower (32 versus 43) and DC cold resistance is higher (0.023 Ω versus 0.015 Ω). This part is suitable for applications where enhanced breaking capacity is beneficial and certification requirements do not mandate AEC-Q200 or CE compliance.

Frequently Asked Questions (FAQ)

Q: Can 0680L6300-05 be used as a direct replacement for 0680L6300-21?

A: Yes. Both parts share identical electrical ratings (6.3 A, 125 V AC/DC), response time (slow blow), package type (2-SMD, square end block), physical dimensions (6.10mm x 2.54mm x 2.54mm), operating temperature range (-55°C ~ 125°C), and approval certifications (AEC-Q200, CE, cURus). The parts are functionally equivalent for board mount circuit protection applications.

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

A: The primary difference is breaking capacity. The 0680L series (0680L6300-21, 0680L6300-01, 0680L6300-05) has a breaking capacity of 50 A AC and 100 A DC. The 0680H series (0680H6300-05) has a breaking capacity of 100 A AC and 500 A DC. Both series maintain the same current rating, voltage rating, and physical dimensions.

Q: Are there certification differences between the substitute parts?

A: Yes. The 0680L series parts (0680L6300-21, 0680L6300-01, 0680L6300-05) carry AEC-Q200, CE, and cURus certifications. The 0680H6300-05 carries only cURus certification. Applications requiring AEC-Q200 or CE compliance should use parts from the 0680L series.

Q: Does the melting I²t value affect substitution compatibility?

A: The melting I²t value indicates the thermal energy required to melt the fuse element. The 0680L series has a melting I²t of 43, while the 0680H6300-05 has a melting I²t of 32. This difference reflects the different internal construction of the fuse elements. For applications with specific thermal response requirements, verify that the substitute part's melting I²t is appropriate for the circuit design.

Q: What does DC cold resistance represent?

A: DC cold resistance is the electrical resistance of the fuse element at room temperature when no current is flowing. The 0680L series has a DC cold resistance of 0.015 Ω, while the 0680H6300-05 has 0.023 Ω. This parameter affects voltage drop across the fuse during normal operation. For applications sensitive to voltage drop, the lower resistance of the 0680L series may be preferred.

Q: Can I use 0680H6300-05 in place of 0680L6300-21 if certifications are not required?

A: Yes, from an electrical and mechanical standpoint. The 0680H6300-05 provides higher breaking capacity and maintains the same current rating, voltage rating, package type, and physical dimensions. However, verify that the lower melting I²t (32 versus 43) and higher DC cold resistance (0.023 Ω versus 0.015 Ω) are acceptable for your specific circuit application.

Q: Are all substitute parts in the same packaging format?

A: Yes. All parts listed are supplied in Tape & Reel (TR) packaging and are surface mount components in the 2-SMD, square end block package format. They are compatible with standard pick-and-place assembly equipment.