Littelfuse 37304000000 Board Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 37304000000 is a 400 mA, 250 V AC/DC board mount fuse with fast blow response characteristics, designed for through-hole radial mounting in TR5® 373 series applications. This component is currently active in production with 982 units in stock. Equivalent parts may be required due to supply chain considerations, design revisions, or inventory optimization while maintaining identical electrical and mechanical performance specifications.

Substiute Parts

37304000000

Littelfuse Inc.In Stock: 103537304000000 Datasheet

Current PartRFQ

37004000000

Littelfuse Inc.In Stock: 102237004000000 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The Littelfuse 37004000000 qualifies as a parametric equivalent to the 37304000000 based on the following critical substitution criteria:

• Current Rating: Identical at 400 mA
• Voltage Rating (AC): Identical at 250 V
• Response Time: Identical fast blow characteristic
• Mounting Type: Identical through-hole configuration
• Package / Case: Identical radial, can, vertical form factor
• Breaking Capacity: Identical 50 A rating
• Physical Dimensions: Identical 0.335" Dia x 0.315" H (8.50mm x 8.00mm)
• Operating Temperature Range: Identical -40°C ~ 85°C
• RoHS Compliance: Both ROHS3 compliant

Both parts belong to the TR5® fuse family (373 and 370 series respectively) and maintain full electrical and mechanical compatibility for direct substitution in board mount applications.

Parameter Comparison

Engineering Selection Recommendations

Both the 37304000000 and 37004000000 are active production components from Littelfuse Inc. with full RoHS3 compliance and equivalent electrical ratings. The 37304000000 carries CSA and cULus approvals, while the 37004000000 carries CCC, cURus, SEMKO, and VDE approvals. Selection between these parts should be based on the specific regulatory certifications required by the end application. Both parts are suitable for direct substitution in board mount fuse applications requiring 400 mA, 250 V fast blow protection with through-hole radial mounting.

Frequently Asked Questions (FAQ)

Q: Can the 37004000000 be used as a direct replacement for the 37304000000?

A: Yes. Both parts share identical electrical ratings (400 mA, 250 V), response characteristics (fast blow), mounting configuration (through-hole radial), physical dimensions (0.335" Dia x 0.315" H), and operating temperature range (-40°C ~ 85°C). They are parametrically equivalent and mechanically interchangeable.

Q: Are there differences in approval certifications between these parts?

A: Yes. The 37304000000 carries CSA and cULus certifications. The 37004000000 carries CCC, cURus, SEMKO, and VDE certifications. Verify that the substitute part's certifications meet your application's regulatory requirements before implementation.

Q: What is the difference between the TR5® 373 and TR5® 370 series designations?

A: Both parts belong to the TR5® fuse family. The series designation (373 vs. 370) reflects internal product line organization within Littelfuse. From an electrical and mechanical standpoint, these parts are equivalent for the specified 400 mA, 250 V application.

Q: Do both parts have identical melting I²t values?

A: No. The 37304000000 has a melting I²t of 0.016, while the 37004000000 has a melting I²t of 0.025. Both values fall within the fast blow response category and are suitable for the specified 400 mA rating. Verify that your application's thermal protection requirements are satisfied by the substitute part's I²t characteristic.

Q: Are both parts RoHS compliant?

A: Yes. Both the 37304000000 and 37004000000 are ROHS3 compliant and REACH unaffected, meeting current environmental regulatory standards.