Littelfuse 37304000430 Board Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 37304000430 is a 400 mA, 250 V AC/DC board mount fuse with fast blow response characteristics. This through-hole radial fuse is designed for circuit protection in electronic equipment requiring reliable overcurrent protection. The part is currently active in production with 1,039 units in stock. Equivalent parts may be required due to supply chain considerations, design revisions, or inventory availability while maintaining identical electrical and mechanical performance specifications.

Substiute Parts

37304000430

Littelfuse Inc.In Stock: 111637304000430 Datasheet

Current PartRFQ

37004000410

Littelfuse Inc.In Stock: 226637004000410 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The Littelfuse 37304000430 has one parametric equivalent: 37004000410. This substitute relationship is established based on the following critical parameters that must remain constant for direct substitution:

• Current Rating: 400 mA (identical)
• Voltage Rating (AC): 250 V (identical)
• Response Time: Fast Blow (identical)
• Mounting Type: Through Hole (identical)
• Fuse Type: Board Mount (Cartridge Style Excluded) (identical)
• Package / Case: Radial, Can, Vertical (identical)
• Size / Dimension: 0.335" Dia x 0.315" H (8.50mm x 8.00mm) (identical)
• Breaking Capacity @ Rated Voltage: 50A (identical)
• Operating Temperature Range: -40°C ~ 85°C (identical)
• RoHS Status: ROHS3 Compliant (identical)

Both parts belong to the Littelfuse TR5® series and are manufactured by Littelfuse Inc., ensuring design and performance compatibility in board mount fuse applications.

Parameter Comparison

Engineering Selection Recommendations

Both the Littelfuse 37304000430 and 37004000410 are active production parts with ROHS3 compliance and identical electrical and mechanical specifications for board mount fuse applications. Selection between these parts should be based on the following factors:

• Approval Agency Requirements: The main part (37304000430) carries CSA and cULus certifications, while the substitute (37004000410) carries CCC, cURus, SEMKO, and VDE certifications. Verify that the required certifications for your application are met by the selected part.

• Thermal Characteristics: The Melting I²t values differ between the two parts (0.016 vs. 0.025). This difference reflects variations in thermal response behavior. Confirm that the thermal characteristics of the selected part are acceptable for your circuit protection requirements.

• Inventory Availability: The substitute part (37004000410) has higher stock availability (2,213 units vs. 1,039 units), which may influence procurement decisions.

• Mechanical Compatibility: Both parts share identical dimensions (0.335" Dia x 0.315" H / 8.50mm x 8.00mm) and mounting characteristics, ensuring direct board-level compatibility.

Frequently Asked Questions (FAQ)

Q: Can I substitute 37004000410 for 37304000430 in my circuit design?

A: Yes, both parts are electrically and mechanically equivalent for board mount fuse applications. They share identical current ratings (400 mA), voltage ratings (250 V AC), response time (Fast Blow), mounting type (Through Hole), package configuration (Radial, Can, Vertical), and physical dimensions (0.335" Dia x 0.315" H). Verify that the certification requirements of your application are met by the substitute part's approval agencies (CCC, cURus, SEMKO, VDE).

Q: What is the difference in Melting I²t between these parts?

A: The main part (37304000430) has a Melting I²t of 0.016, while the substitute (37004000410) has a Melting I²t of 0.025. This parameter represents the thermal energy required to melt the fuse element. The difference indicates slightly different thermal response characteristics. Ensure that the thermal behavior of the selected part aligns with your circuit protection strategy.

Q: Are the certifications interchangeable between these parts?

A: No. The main part carries CSA and cULus certifications, while the substitute carries CCC, cURus, SEMKO, and VDE certifications. Your application requirements determine which certifications are necessary. Verify compliance with your regional and industry standards before selecting a part.

Q: Do these parts have identical physical dimensions?

A: Yes. Both parts have identical dimensions of 0.335" Dia x 0.315" H (8.50mm x 8.00mm) and use the same radial, can, vertical package configuration. They are mechanically interchangeable on PCBs designed for through-hole radial fuse mounting.

Q: Which part should I choose if both are available?

A: Selection depends on your specific requirements. If your application requires CSA or cULus certification, use 37304000430. If your application requires CCC, cURus, SEMKO, or VDE certification, use 37004000410. If certifications are not a constraint, either part is suitable. The substitute (37004000410) offers higher inventory availability.

Q: Are both parts currently in production?

A: Yes. Both the Littelfuse 37304000430 and 37004000410 are active production parts with current stock availability.