Littelfuse TR5® 373 1A 250VAC Board Mount Fuse 37311000430

Part Overview

The Littelfuse 37311000430 is a 1 A, 250 V AC/DC board mount fuse with radial, can, vertical package configuration. This fast-blow fuse is designed for through-hole mounting applications requiring overcurrent protection in electronic circuits. The part is currently active in production with 1048 units in stock. Alternative equivalent parts are available to support supply chain flexibility and design requirements across different approval agency certifications.

Substiute Parts

37311000430

Littelfuse Inc.In Stock: 107237311000430 Datasheet

Current PartRFQ

37311000410

Littelfuse Inc.In Stock: 228837311000410 Datasheet

DirectRFQ

37011000410

Littelfuse Inc.In Stock: 332937011000410 Datasheet

Parametric EquivalentRFQ

37011000430

LittelfuseIn Stock: 154937011000430 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Littelfuse 37311000430 is determined by the following critical parameters:

Primary Substitution Criteria:

• Current Rating: 1 A (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Mounting Type: Through Hole (exact match required)
• Package / Case: Radial, Can, Vertical (exact match required)
• Response Time: Fast Blow (exact match required)
• Operating Temperature Range: -40°C ~ 85°C (exact match required)
• Physical Dimensions: 0.335" Dia x 0.315" H / 8.50mm x 8.00mm (exact match required)

Secondary Considerations:

• Breaking Capacity @ Rated Voltage: 50 A (all substitutes meet or exceed this specification)
• Approval Agency Certifications: May vary between main part and substitutes
• Melting I²t: May vary within acceptable tolerance ranges
• DC Cold Resistance: May vary within acceptable tolerance ranges

All substitute parts listed below meet the primary substitution criteria and are manufactured by Littelfuse Inc. Variations in secondary parameters do not affect functional interchangeability for standard board mount fuse applications.

Parameter Comparison

Engineering Selection Recommendations

Direct Substitute (37311000410): The 37311000410 is a direct substitute within the TR5® 373 series. It shares identical electrical specifications, physical dimensions, and response characteristics with the main part 37311000430. Both parts carry CSA and cULus certifications. This substitute is recommended when TR5® 373 series continuity is required and inventory availability is a consideration (2193 units in stock).

Parametric Equivalent (37011000410 and 37011000430): The TR5® 370 series parts (37011000410 and 37011000430) are parametric equivalents that meet all primary substitution criteria. These parts differ in approval agency certifications (CCC, cURus, PSE, SEMKO, VDE) and melting I²t specification (0.2 versus 0.125). Selection of TR5® 370 series substitutes is appropriate when the application requires the expanded certification portfolio or when supply chain considerations favor the higher inventory availability (3282 and 1502 units respectively).

All substitute parts maintain active product status and ROHS3 compliance. Selection between substitutes should be based on specific application certification requirements and supply chain logistics.

Frequently Asked Questions (FAQ)

Q: Can I use part 37311000410 as a direct replacement for 37311000430?

A: Yes. Both parts are from the TR5® 373 series and share identical electrical ratings (1 A, 250 V AC), response time (Fast Blow), physical dimensions (0.335" Dia x 0.315" H), and approval certifications (CSA, cULus). They are functionally interchangeable for board mount fuse applications.

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

A: The TR5® 370 series (37011000410, 37011000430) maintains all critical electrical and mechanical parameters identical to the TR5® 373 series. The primary differences are the approval agency certifications and melting I²t specification. TR5® 370 parts carry CCC, cURus, PSE, SEMKO, and VDE certifications, while TR5® 373 parts carry CSA and cULus certifications. The melting I²t for TR5® 370 is 0.2 compared to 0.125 for TR5® 373.

Q: Are all substitute parts through-hole mounted with the same package configuration?

A: Yes. All listed substitutes use through-hole mounting with radial, can, vertical package configuration. Physical dimensions are identical across all parts: 0.335" Dia x 0.315" H (8.50mm x 8.00mm).

Q: Do all substitute parts meet RoHS compliance?

A: Yes. All parts listed—37311000430, 37311000410, 37011000410, and 37011000430—are ROHS3 compliant.

Q: Which substitute should I select based on inventory availability?

A: The 37011000410 has the highest inventory (3282 units), followed by 37311000410 (2193 units), 37011000430 (1502 units), and 37311000430 (1048 units). Selection should also consider application-specific certification requirements and series continuity preferences.

Q: Can I mix TR5® 373 and TR5® 370 series parts in the same circuit board design?

A: Yes. Both series meet identical electrical and mechanical specifications for 1 A, 250 V AC/DC board mount fuse applications. However, design documentation should reflect the specific part numbers used to maintain traceability and support future maintenance or rework activities.