Littelfuse 39705000000 Board Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 39705000000 is a 500 mA, 125 V AC/DC board mount fuse with slow blow response characteristics, designed for through-hole radial mounting applications. This fuse is part of the TE5® 397 series and carries active product status with full cUL and UL approvals. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained across the same functional category, allowing for procurement flexibility and inventory optimization.

Substiute Parts

39705000000

Littelfuse Inc.In Stock: 73339705000000 Datasheet

Current PartRFQ

39605000000

Littelfuse Inc.In Stock: 219939605000000 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Littelfuse 39705000000 is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Current Rating: 500 mA
• Voltage Rating - AC: 125 V
• Response Time: Slow Blow
• Mounting Type: Through Hole
• Fuse Type: Board Mount (Cartridge Style Excluded)
• Package / Case: Radial, Box
• Physical Dimensions: 0.335" L x 0.157" W x 0.315" H (8.50mm x 4.00mm x 8.00mm)
• Operating Temperature Range: -40°C ~ 85°C
• Approval Agencies: cUL, UL

The substitute part 39605000000 meets all mandatory matching parameters, confirming functional and mechanical interchangeability. Differences in breaking capacity, melting I²t, DC cold resistance, and packaging format (Cut Tape vs. Tape & Box) do not affect substitution eligibility within the same electrical and mechanical classification.

Parameter Comparison

Engineering Selection Recommendations

Both the Littelfuse 39705000000 and 39605000000 are active products carrying identical cUL and UL certifications, confirming compliance with applicable safety standards. Selection between these parts should be based on:

Primary Consideration: Both parts are functionally equivalent for applications requiring 500 mA, 125 V AC/DC slow blow fuse protection with through-hole radial mounting.

Secondary Considerations: The substitute part 39605000000 offers higher breaking capacity (100A vs. 50A) and lower DC cold resistance (0.247 Ohms vs. 0.34237 Ohms), which may provide performance advantages in specific circuit designs. Both parts maintain ROHS3 compliance and operate across the identical temperature range.

Packaging Availability: The main part is supplied in Tape & Box format with 625 units in stock, while the substitute is available in Cut Tape format with 2102 units in stock. Packaging selection should align with procurement and assembly requirements.

Frequently Asked Questions (FAQ)

Q: Can the 39605000000 be used as a direct replacement for the 39705000000?

A: Yes. Both parts share identical electrical ratings (500 mA, 125 V AC/DC), response characteristics (slow blow), mounting configuration (through-hole radial), physical dimensions (8.50mm x 4.00mm x 8.00mm), and regulatory approvals (cUL, UL). They are functionally and mechanically interchangeable.

Q: What is the difference between the TE5® 397 and TE5® 396 series?

A: Both series are part of the Littelfuse TE5® family and meet the same electrical and mechanical specifications for this 500 mA, 125 V application. Series designation reflects internal design iterations; functional performance for this rating is equivalent.

Q: Does the higher breaking capacity of the 39605000000 affect compatibility?

A: No. Higher breaking capacity (100A vs. 50A) is a performance enhancement that does not compromise compatibility. The substitute part will function identically in circuits designed for the main part.

Q: Are there packaging format restrictions for substitution?

A: Packaging format (Tape & Box vs. Cut Tape) affects procurement and assembly logistics but does not impact electrical or mechanical compatibility. Selection should be based on manufacturing process requirements.

Q: Do both parts meet the same environmental and compliance standards?

A: Yes. Both parts are ROHS3 compliant, REACH unaffected, and operate across the identical temperature range (-40°C ~ 85°C). Both carry cUL and UL approvals.