Littelfuse 37415000000 Board Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 37415000000 is a 5 A, 250 V AC/DC board mount fuse with slow blow response characteristics, designed for through-hole radial mounting in vertical orientation. This TR5® 374 series fuse is actively produced and widely used in circuit protection applications requiring reliable overcurrent protection with controlled response time. Substitute parts may be required due to inventory availability, regional compliance certifications, or specific application requirements where alternative breaking capacity or thermal characteristics are acceptable within the electrical parameters.

Key Parameters

Parameter	Value
Current Rating	5 A
Voltage Rating (AC)	250 V
Response Time	Slow Blow
Mounting Type	Through Hole
Package / Case	Radial, Can, Vertical
Physical Dimensions	0.335" Dia x 0.315" H (8.50mm x 8.00mm)
Breaking Capacity @ Rated Voltage	50 A
Operating Temperature Range	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the Littelfuse 37415000000 is determined by strict equivalence in the following critical parameters:

Current Rating: Must be 5 A
Voltage Rating (AC): Must be 250 V
Response Time: Must be Slow Blow
Mounting Type: Must be Through Hole
Package / Case: Must be Radial, Can, Vertical configuration
Operating Temperature Range: Must support -40°C ~ 85°C

Secondary parameters that may vary between substitutes include breaking capacity, melting I²t characteristics, DC cold resistance, and approval agency certifications. These variations do not affect functional substitutability provided the primary electrical and mechanical parameters remain constant.

Parameter Comparison

Parameter	37415000000 (Main)	37215000001	38215000000	0034.7322
Manufacturer	Littelfuse	Littelfuse Inc.	Littelfuse Inc.	SCHURTER Inc.
Series	TR5® 374	TR5® 372	TR5® 382	MSTU 250
Current Rating (Amps)	5 A	5 A	5 A	5 A
Voltage Rating - AC	250 V	250 V	250 V	250 V
Response Time	Slow Blow	Slow Blow	Slow Blow	Slow 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
Physical Dimensions	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 0.335" H (8.50mm x 8.50mm)
Breaking Capacity @ Rated Voltage	50 A	50 A	100 A	50 A
Melting I²t	59	115	121.25	142
DC Cold Resistance (Ohms)	0.0122	0.0094	0.0108	Not specified
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Product Status	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts maintain active product status and ROHS3 compliance, ensuring continued availability and environmental regulatory adherence.

Littelfuse 37215000001 (TR5® 372): Electrically equivalent with identical current, voltage, and response characteristics. Offers expanded approval agency coverage (CCC, cURus, PSE, SEMKO, VDE) compared to the main part (CSA, cULus). Lower DC cold resistance (0.0094 Ohms vs. 0.0122 Ohms) and higher melting I²t (115 vs. 59) provide enhanced thermal stability. Significantly higher inventory availability (17,100 units) supports supply chain continuity.

Littelfuse 38215000000 (TR5® 382): Electrically equivalent with identical current, voltage, and response characteristics. Provides doubled breaking capacity (100 A vs. 50 A) and broadest approval agency coverage (CQC, cURus, KC, PSE/JET, SEMKO, VDE). Higher melting I²t (121.25) and lower DC cold resistance (0.0108 Ohms) indicate improved thermal performance. Suitable for applications requiring enhanced fault current handling capability.

SCHURTER 0034.7322 (MSTU 250): Electrically equivalent with identical current, voltage, and response characteristics. Maintains identical breaking capacity (50 A) and approval agency certification (cULus). Physical height dimension differs slightly (0.335" vs. 0.315"), requiring PCB layout verification. Highest melting I²t value (142) among all substitutes. Lower inventory availability (1,873 units) may impact procurement timelines.

Frequently Asked Questions (FAQ)

Q: Can I substitute the Littelfuse 37415000000 with any of the listed parts?

A: Yes, all listed parts are electrically and mechanically equivalent based on current rating (5 A), voltage rating (250 V AC), response time (slow blow), mounting type (through hole), and package configuration (radial, can, vertical). Physical dimensions are identical or functionally compatible for standard PCB layouts.

Q: What is the difference between the main part and substitute parts?

A: The primary differences are manufacturer series designation, breaking capacity, melting I²t characteristics, DC cold resistance, and approval agency certifications. These variations do not affect the core protective function but may influence performance in specific fault scenarios or regional compliance requirements.

Q: Does the SCHURTER 0034.7322 have a different physical height?

A: Yes, the SCHURTER part has a height of 0.335" (8.50mm) compared to 0.315" (8.00mm) for Littelfuse parts. This 0.020" difference requires verification against PCB clearance specifications and component placement constraints before substitution.

Q: Which substitute part offers the best thermal performance?

A: The SCHURTER 0034.7322 has the highest melting I²t value (142), indicating the slowest thermal response. The Littelfuse 38215000000 offers the highest breaking capacity (100 A) with strong thermal characteristics (melting I²t of 121.25).

Q: Are all substitute parts ROHS3 compliant?

A: Yes, all listed parts maintain ROHS3 compliance status, ensuring compatibility with environmental and regulatory requirements.

Q: What inventory levels are available for each part?

A: Littelfuse 37415000000: 2,400 units; Littelfuse 37215000001: 17,100 units; Littelfuse 38215000000: 14,805 units; SCHURTER 0034.7322: 1,873 units.

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