Littelfuse TR5® 373 37301000430 Board Mount Fuse 100mA 250VAC Equivalent & Substitute Parts

Part Overview

The Littelfuse 37301000430 is a board mount fuse rated for 100 mA at 250 V AC/DC with fast blow response time. This through-hole radial component is designed for circuit protection in electronic equipment requiring compact, reliable overcurrent protection. The part is active in production with full CSA and cULus approval certifications. Equivalent and substitute parts become necessary when managing inventory across multiple procurement channels, accommodating supply chain variations, or selecting from alternative series within the same manufacturer's product line that meet identical electrical and mechanical specifications.

Substiute Parts

37301000430

Littelfuse Inc.In Stock: 125237301000430 Datasheet

Current PartRFQ

37301000410

Littelfuse Inc.In Stock: 125837301000410 Datasheet

DirectRFQ

37001000410

Littelfuse Inc.In Stock: 289437001000410 Datasheet

Parametric EquivalentRFQ

37001000430

Littelfuse Inc.In Stock: 129537001000430 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 37301000430 is determined by strict equivalence across the following critical parameters: current rating (100 mA), voltage rating (250 V AC), response time (fast blow), mounting type (through hole), package configuration (radial, can, vertical), breaking capacity (50 A), physical dimensions (0.335" Dia x 0.315" H), and operating temperature range (-40°C ~ 85°C).

The substitute parts are grouped into two categories:

Direct Manufacturer Equivalent (37301000410): Identical electrical and mechanical specifications within the same TR5® 373 series. All parameters match the main part exactly, including approval agencies (CSA, cULus) and melting I²t value (0.0013).

Parametric Equivalents (37001000410, 37001000430): Parts from the TR5® 370 series that maintain all critical electrical and mechanical parameters. These differ only in melting I²t value (0.0038 versus 0.0013) and approval agency certifications (CCC, cURus, SEMKO, VDE versus CSA, cULus), while preserving identical current, voltage, response time, mounting, package, breaking capacity, dimensions, and temperature range.

Parameter Comparison

Engineering Selection Recommendations

37301000410 (Direct Equivalent): This part maintains complete specification parity with the main part 37301000430 within the TR5® 373 series. Both parts carry identical CSA and cULus certifications and share the same melting I²t characteristic (0.0013). Selection of this direct equivalent introduces no technical or compliance considerations.

37001000410 and 37001000430 (Parametric Equivalents): These TR5® 370 series parts satisfy all critical electrical and mechanical requirements. The melting I²t value differs (0.0038 versus 0.0013), reflecting a different thermal response characteristic within the fast blow category. Approval certifications differ (CCC, cURus, SEMKO, VDE versus CSA, cULus), requiring verification that the target application's regulatory environment accepts these certifications. Both parts maintain ROHS3 compliance and active product status.

Frequently Asked Questions (FAQ)

Q: Can 37301000410 be used as a direct replacement for 37301000430?

A: Yes. Both parts are identical in all electrical and mechanical specifications, including current rating, voltage rating, response time, package dimensions, breaking capacity, and approval certifications. They are interchangeable within the same circuit design.

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

A: The primary difference is the melting I²t value: TR5® 373 parts have 0.0013, while TR5® 370 parts have 0.0038. Both maintain fast blow response and identical electrical ratings. The approval certifications also differ: TR5® 373 carries CSA and cULus; TR5® 370 carries CCC, cURus, SEMKO, and VDE.

Q: Are the physical dimensions identical across all four parts?

A: Yes. All parts share the same radial, can, vertical package configuration with dimensions of 0.335" Dia x 0.315" H (8.50mm x 8.00mm). They are mechanically interchangeable on the PCB.

Q: Which certifications apply to each part?

A: 37301000430 and 37301000410 carry CSA and cULus certifications. 37001000410 and 37001000430 carry CCC, cURus, SEMKO, and VDE certifications. Application requirements determine which certification set is necessary.

Q: Do all parts meet RoHS requirements?

A: Yes. All four parts are ROHS3 compliant and REACH unaffected, meeting environmental compliance standards.

Q: What is the current rating tolerance across these parts?

A: All parts are rated for 100 mA at 250 V AC/DC with fast blow response time. No tolerance variation exists across the substitute parts.