Littelfuse 37202000411 Equivalent & Substitute Parts

Part Overview

The Littelfuse 37202000411 is a 200 mA, 250 V AC board mount radial fuse in the TR5® 372 series. This through-hole component is designed for circuit protection in applications requiring slow-blow response characteristics. The part is active in production with full compliance to RoHS3, CCC, cURus, SEMKO, and VDE standards. Equivalent and substitute parts are identified when component availability is limited or when design requirements permit alternative manufacturers or series variants that maintain electrical and mechanical compatibility within specified parameters.

Key Parameters

Parameter	Value
Manufacturer Part Number	37202000411
Manufacturer	Littelfuse Inc.
Current Rating	200 mA
Voltage Rating (AC)	250 V
Response Time	Slow Blow
Mounting Type	Through Hole
Package / Case	Radial, Can, Vertical
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
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility for the 37202000411 is determined by the following critical parameters:

Current Rating: 200 mA (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Response Time: Slow 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)

Substitute parts are grouped into two categories:

Parametric Equivalents (Littelfuse TR5® 372 and TR5® 374 Series): Parts 37202000431, 37402000410, and 37402000430 share identical electrical ratings and mechanical form factors. These parts differ in series designation, breaking capacity, melting I²t, and approval agencies but maintain full compatibility with the original part's core electrical and mechanical specifications.

Direct Manufacturer Equivalents (SCHURTER and Bel Fuse): Parts 0034.6608, 0034.6708, 0034.6808, and MRT 200-BULK are manufactured by alternative suppliers and meet all critical electrical and mechanical parameters. These parts may have extended operating temperature ranges, different breaking capacities, or alternative approval certifications but maintain the same current rating, voltage rating, response time, and physical dimensions.

Parameter Comparison

Parameter	37202000411	37202000431	37402000410	37402000430	0034.6608	0034.6708	0034.6808	MRT 200-BULK
Manufacturer	Littelfuse	Littelfuse	Littelfuse	Littelfuse	SCHURTER	SCHURTER	SCHURTER	Bel Fuse
Series	TR5® 372	TR5® 372	TR5® 374	TR5® 374	MST 250	MST 250	MST 250	MRT
Current Rating (Amps)	200 mA	200 mA	200 mA	200 mA	200 mA	200 mA	200 mA	200 mA
Voltage Rating - AC	250 V	250 V	250 V	250 V	250 V	250 V	250 V	250 V
Voltage Rating - DC	Not specified	Not specified	Not specified	Not specified	125 V	125 V	125 V	Not specified
Response Time	Slow Blow	Slow Blow	Slow Blow	Slow Blow	Slow Blow	Slow Blow	Slow Blow	Slow Blow
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Radial, Can, Vertical	Radial, Can, Vertical	Radial, Can, Vertical	Radial, Can, Vertical	Radial, Can, Vertical	Radial, Can, Vertical	Radial, Can, Vertical	Radial, Can, Vertical
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)	0.335" Dia x 0.335" H (8.50mm x 8.50mm)	0.335" Dia x 0.335" H (8.50mm x 8.50mm)	0.335" Dia x 0.335" H (8.50mm x 8.50mm)	0.329" Dia x 0.303" H (8.35mm x 7.70mm)
Operating Temperature Range	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Breaking Capacity @ Rated Voltage	35A	35A	50A	50A	35A AC, 50A DC	35A AC, 50A DC	35A AC, 50A DC	50A
Melting I²t	0.312	0.312	0.1	0.1	0.35	0.35	0.35	0.11
DC Cold Resistance	0.575 Ohms	0.575 Ohms	1.2 Ohms	1.2 Ohms	Not specified	Not specified	Not specified	0.73 Ohms
Product Status	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

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

Littelfuse Parametric Equivalents (37202000431, 37402000410, 37402000430): These parts are recommended when Littelfuse series continuity is required. Part 37202000431 is a direct series match (TR5® 372) with identical electrical characteristics. Parts 37402000410 and 37402000430 belong to the TR5® 374 series with enhanced breaking capacity (50A vs. 35A) and different approval certifications (CSA, cULus vs. CCC, cURus, SEMKO, VDE). Selection between these variants depends on specific approval requirements for the end application.

SCHURTER MST 250 Series (0034.6608, 0034.6708, 0034.6808): These parts are suitable for applications requiring extended operating temperature range (-55°C ~ 125°C vs. -40°C ~ 85°C) and dual voltage rating capability (250 V AC / 125 V DC). The SCHURTER parts feature identical breaking capacity at AC rating (35A) and support broader approval certifications (CCC, cURus, KC, VDE). Part 0034.6808 is available in Cut Tape packaging, while 0034.6608 and 0034.6708 are supplied in Bulk. Physical dimensions differ slightly (0.335" Dia x 0.335" H vs. 0.335" Dia x 0.315" H), requiring PCB layout verification.

Bel Fuse MRT 200-BULK: This part offers enhanced breaking capacity (50A), extended operating temperature range (-55°C ~ 125°C), and comprehensive approval certifications including AEC-Q200. Physical dimensions are slightly reduced (0.329" Dia x 0.303" H), requiring PCB footprint confirmation. This part is suitable for automotive and high-reliability applications.

Frequently Asked Questions (FAQ)

Q: Can 37202000431 be used as a direct replacement for 37202000411?

A: Yes. Both parts are Littelfuse TR5® 372 series components with identical current rating (200 mA), voltage rating (250 V AC), response time (Slow Blow), mounting type (Through Hole), and physical dimensions (0.335" Dia x 0.315" H). Electrical characteristics including melting I²t (0.312) and DC cold resistance (0.575 Ohms) are identical.

Q: What are the differences between Littelfuse TR5® 372 and TR5® 374 series parts?

A: The TR5® 374 series (37402000410, 37402000430) provides higher breaking capacity (50A vs. 35A) and lower melting I²t (0.1 vs. 0.312). Approval certifications differ: TR5® 374 carries CSA and cULus approvals, while TR5® 372 carries CCC, cURus, SEMKO, and VDE approvals. Both series maintain identical current, voltage, and response time ratings.

Q: Are SCHURTER MST 250 parts compatible with the original 37202000411?

A: SCHURTER parts (0034.6608, 0034.6708, 0034.6808) are electrically compatible for AC applications at 250 V and 200 mA. These parts offer extended operating temperature range (-55°C ~ 125°C) and dual voltage capability (125 V DC). Physical dimensions differ slightly in height (0.335" H vs. 0.315" H), requiring PCB layout verification before substitution.

Q: What is the difference between 0034.6608, 0034.6708, and 0034.6808?

A: These three SCHURTER parts are electrically and mechanically identical. The primary difference is packaging: 0034.6608 and 0034.6708 are supplied in Bulk packaging, while 0034.6808 is supplied in Cut Tape (CT) packaging. Selection depends on assembly process requirements and inventory management preferences.

Q: Can MRT 200-BULK be used in place of 37202000411?

A: Yes, for applications where the slightly reduced physical dimensions (0.329" Dia x 0.303" H vs. 0.335" Dia x 0.315" H) are acceptable. MRT 200-BULK provides higher breaking capacity (50A), extended operating temperature range (-55°C ~ 125°C), and AEC-Q200 qualification. PCB footprint compatibility must be confirmed before substitution.

Q: Which substitute part has the broadest approval certifications?

A: Bel Fuse MRT 200-BULK carries the most comprehensive approvals: AEC-Q200, CCC, CE, CSA, cURus, SEMKO, and VDE. This part is recommended for applications requiring automotive qualification or multi-regional compliance.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed (37202000431, 37402000410, 37402000430, 0034.6608, 0034.6708, 0034.6808, MRT 200-BULK) are ROHS3 compliant and REACH unaffected, meeting environmental regulatory requirements equivalent to the original 37202000411.

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