Littelfuse 37312500430 Board Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 37312500430 is a 2.5 A, 250 V AC/DC board mount fuse with fast blow response characteristics, designed for through-hole radial mounting in vertical orientation. This TR5® 373 series fuse is actively produced and widely stocked. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical form factors, and approval certifications to ensure direct interchangeability in circuit protection applications.

Key Parameters

Parameter	Value
Current Rating	2.5 A
Voltage Rating (AC)	250 V
Response Time	Fast Blow
Mounting Type	Through Hole
Package / Case	Radial, Can, Vertical
Breaking Capacity @ Rated Voltage	50 A
Size / Dimension	0.335" Dia x 0.315" H (8.50mm x 8.00mm)
Operating Temperature Range	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Current Rating: 2.5 A (exact match required)
Voltage Rating: 250 V AC (exact match required)
Response Time: Fast Blow (exact match required)
Mounting Type: Through Hole (exact match required)
Package / Case: Radial, Can, Vertical (exact match required)
Size / Dimension: 0.335" Dia x 0.315" H / 8.50mm x 8.00mm (exact match required)
Operating Temperature Range: -40°C ~ 85°C (exact match required)

All substitute parts listed below meet these core electrical and mechanical parameters. Variations in series designation (TR5® 373 vs. TR5® 370), melting I²t values, and approval agency certifications do not preclude substitution when all primary parameters align.

Parameter Comparison

Parameter	37312500430 (Main)	37312500410	37012500410	37012500430
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse	Littelfuse Inc.
Current Rating (Amps)	2.5 A	2.5 A	2.5 A	2.5 A
Voltage Rating - AC	250 V	250 V	250 V	250 V
Response Time	Fast Blow	Fast Blow	Fast Blow	Fast Blow
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Radial, Can, Vertical	Radial, Can, Vertical	Radial, Can, Vertical	Radial, Can, Vertical
Breaking Capacity @ Rated Voltage	50 A	50 A	50 A	50 A
Size / Dimension	0.335" Dia x 0.315" H (8.50mm x 8.00mm)	0.335" Dia x 0.315" H (8.50mm x 8.00mm)	0.335" Dia x 0.315" H (8.50mm x 8.00mm)	0.335" Dia x 0.315" H (8.50mm x 8.00mm)
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Series	TR5® 373	TR5® 373	TR5® 370	TR5® 370
Melting I²t	1.2	1.2	1.8	1.8
Product Status	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All four parts listed—37312500430, 37312500410, 37012500410, and 37012500430—are active products manufactured by Littelfuse Inc. and are ROHS3 compliant. Selection among these parts is based on availability and approval agency requirements specific to the end application.

37312500430 and 37312500410 (TR5® 373 series) share identical electrical characteristics and melting I²t values of 1.2, differing only in packaging configuration codes.

37012500410 and 37012500430 (TR5® 370 series) are parametric equivalents with melting I²t values of 1.8. These parts carry broader approval agency certifications (CCC, cURus, PSE, SEMKO, VDE) compared to the TR5® 373 series (CSA, cULus). Selection of TR5® 370 series parts is appropriate when applications require these additional certifications.

Frequently Asked Questions (FAQ)

Q: Can 37012500410 or 37012500430 be used as direct replacements for 37312500430?

A: Yes. All four parts share identical current rating (2.5 A), voltage rating (250 V AC), response time (Fast Blow), mounting type (Through Hole), package form (Radial, Can, Vertical), physical dimensions (0.335" Dia x 0.315" H), and operating temperature range (-40°C ~ 85°C). The TR5® 370 series parts carry additional approval certifications suitable for broader regulatory requirements.

Q: What is the significance of the melting I²t difference between TR5® 373 and TR5® 370 series?

A: Melting I²t is a thermal energy parameter that characterizes fuse response. The TR5® 373 series has a melting I²t of 1.2, while the TR5® 370 series has 1.8. Both values are provided as specified parameters; selection depends on application-specific thermal requirements and circuit design validation.

Q: Are there any physical or mechanical differences between these substitute parts?

A: No. All parts share identical physical dimensions (0.335" Dia x 0.315" H / 8.50mm x 8.00mm), mounting type (Through Hole), and package orientation (Radial, Can, Vertical). PCB footprint compatibility is assured across all four parts.

Q: Which approval certifications apply to each part?

A: 37312500430 and 37312500410 carry CSA and cULus certifications. 37012500410 and 37012500430 carry CCC, cURus, PSE, SEMKO, and VDE certifications. Selection should align with regulatory requirements of the target market and application.

Q: What is the current inventory status for these parts?

A: 37312500430: 884 Pcs; 37312500410: 1498 Pcs; 37012500410: 3072 Pcs; 37012500430: 712 Pcs. All parts are listed as new original stock.

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