Littelfuse 37402000430 Board Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 37402000430 is a 200 mA, 250 V AC/DC board mount fuse with slow blow response characteristics, designed for through-hole radial mounting in radial can vertical package configuration. This TR5® 374 series fuse is actively produced and widely stocked (1044 pcs available). Equivalent and substitute parts are identified to support design flexibility, procurement optimization, and supply chain continuity when the primary part number becomes unavailable or when alternative packaging or certification requirements necessitate component substitution.

Substiute Parts

37402000430

Littelfuse Inc.In Stock: 114637402000430 Datasheet

Current PartRFQ

37402000410

Littelfuse Inc.In Stock: 204937402000410 Datasheet

DirectRFQ

37202000411

Littelfuse Inc.In Stock: 130937202000411 Datasheet

Parametric EquivalentRFQ

37202000431

Littelfuse Inc.In Stock: 83537202000431 Datasheet

Parametric EquivalentRFQ

0034.7108

SCHURTER Inc.In Stock: 12490034.7108 Datasheet

DirectRFQ

0034.7308

SCHURTER Inc.In Stock: 17790034.7308 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the Littelfuse 37402000430 are classified into two categories based on parametric equivalence:

Direct Manufacturer Equivalents (Same Series, Identical Specifications):

• 37402000410 (Littelfuse TR5® 374): Identical electrical and mechanical specifications with higher inventory availability (2028 pcs). Shares all critical parameters including 200 mA current rating, 250 V voltage rating, 50A breaking capacity, and 0.335" Dia x 0.315" H dimensions.
• 0034.7108 (SCHURTER MSTU 250): Meets all functional requirements with identical current, voltage, and response characteristics. Dimensions are 0.335" Dia x 0.335" H (8.50mm x 8.50mm), representing a minor height variation of 0.02" (0.50mm). Breaking capacity and melting I²t characteristics support equivalent performance.
• 0034.7308 (SCHURTER MSTU 250): Functionally equivalent to 0034.7108 with identical electrical specifications. Available in Cut Tape (CT) packaging instead of Bulk, providing alternative procurement format.

Parametric Equivalents (Same Series, Allowable Parameter Variations):

• 37202000411 (Littelfuse TR5® 372): Maintains 200 mA current rating and 250 V voltage rating with identical dimensions and operating temperature range. Breaking capacity is 35A (versus 50A in main part) and melting I²t is 0.312 (versus 0.1 in main part). DC cold resistance is 0.575 Ohms (versus 1.2 Ohms). Certifications include CCC, cURus, SEMKO, and VDE.
• 37202000431 (Littelfuse TR5® 372): Identical specifications to 37202000411 with lower inventory (760 pcs). Supports equivalent substitution with same parameter variations.

Substitution eligibility is determined by matching current rating (200 mA), voltage rating (250 V AC), response time (Slow Blow), mounting type (Through Hole), and package category (Radial, Can, Vertical). Variations in breaking capacity, melting I²t, and dimensional tolerances within the radial can vertical package are allowable for equivalent substitution.

Parameter Comparison

Engineering Selection Recommendations

For Direct Substitution (No Design Modification Required):

Part 37402000410 is the primary direct substitute. It maintains identical electrical specifications, mechanical dimensions, and CSA/cULus certifications as the main part 37402000430. Both are from the Littelfuse TR5® 374 series with 50A breaking capacity and 0.1 melting I²t. Higher inventory availability (2028 pcs) supports procurement continuity.

Parts 0034.7108 and 0034.7308 (SCHURTER MSTU 250 series) are direct functional equivalents with cULus certification. The 0.02" (0.50mm) height variation in the radial can vertical package is within acceptable mechanical tolerance for through-hole board mount applications. Part 0034.7308 provides an alternative Cut Tape packaging option when bulk quantities are not required.

For Parametric Substitution (Design Review Recommended):

Parts 37202000411 and 37202000431 (Littelfuse TR5® 372 series) maintain the critical 200 mA current rating and 250 V voltage rating with identical physical dimensions and operating temperature range. These parts feature different electrical characteristics: 35A breaking capacity (versus 50A), 0.312 melting I²t (versus 0.1), and 0.575 Ohms DC cold resistance (versus 1.2 Ohms). Certifications expand to include CCC, cURus, SEMKO, and VDE. Substitution is appropriate when the application does not require the higher breaking capacity or when the alternative certification profile is beneficial.

Certification Considerations:

The main part 37402000430 carries CSA and cULus approvals. Direct equivalents 37402000410, 0034.7108, and 0034.7308 maintain cULus certification. Parametric equivalents 37202000411 and 37202000431 carry expanded certifications (CCC, cURus, SEMKO, VDE) suitable for applications requiring broader regional compliance.

Frequently Asked Questions (FAQ)

Q: Can I substitute 37402000410 for 37402000430 without any circuit modifications?

A: Yes. Part 37402000410 is a direct equivalent with identical current rating (200 mA), voltage rating (250 V), response time (Slow Blow), breaking capacity (50A), melting I²t (0.1), and physical dimensions (0.335" Dia x 0.315" H). Both carry CSA and cULus certifications and are from the same TR5® 374 series.

Q: What is the difference between the SCHURTER parts (0034.7108 and 0034.7308)?

A: Both SCHURTER MSTU 250 parts are electrically and mechanically equivalent. The primary difference is packaging: 0034.7108 is supplied in Bulk format, while 0034.7308 is supplied in Cut Tape (CT) format. Select based on procurement and assembly requirements.

Q: Can I use 37202000411 or 37202000431 as substitutes?

A: These parts are parametric equivalents suitable for substitution when the application does not require the 50A breaking capacity of the main part. Both maintain the 200 mA current rating, 250 V voltage rating, and identical physical dimensions. The 35A breaking capacity and 0.312 melting I²t differ from the main part. Design review is recommended to confirm compatibility with circuit protection requirements.

Q: Are there dimensional compatibility issues with the SCHURTER parts?

A: The SCHURTER MSTU 250 parts (0034.7108 and 0034.7308) have a height of 0.335" (8.50mm) compared to 0.315" (8.00mm) for the main part and Littelfuse equivalents. This 0.02" (0.50mm) difference is within acceptable mechanical tolerance for radial can vertical through-hole mounting. Verify PCB clearance in applications with height-constrained layouts.

Q: Which substitute part has the best inventory availability?

A: Part 0034.7308 (SCHURTER MSTU 250, Cut Tape) has the highest inventory at 1714 pcs, followed by 37402000410 (Littelfuse TR5® 374) at 2028 pcs. Both support immediate procurement needs.

Q: Do all substitute parts meet RoHS3 compliance?

A: Yes. All listed substitute parts (37402000410, 37202000411, 37202000431, 0034.7108, and 0034.7308) are ROHS3 Compliant and REACH Unaffected, matching the environmental compliance profile of the main part 37402000430.

Q: What certifications should I verify for my specific application?

A: The main part carries CSA and cULus certifications. Direct equivalents 37402000410, 0034.7108, and 0034.7308 maintain cULus certification. Parametric equivalents 37202000411 and 37202000431 carry CCC, cURus, SEMKO, and VDE certifications. Select based on regional regulatory requirements and application standards.