Littelfuse TE5® 39708000000 Board Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse TE5® 39708000000 is an 800 mA, 125 V AC/DC board mount fuse with slow blow response characteristics, designed for through-hole radial mounting applications. This fuse is actively produced and widely used in circuit protection applications requiring reliable overcurrent protection in industrial and commercial equipment. Substitute parts may be required due to packaging availability, inventory constraints, or specific application requirements while maintaining equivalent electrical performance.

Substiute Parts

39708000000

Littelfuse Inc.In Stock: 72939708000000 Datasheet

Current PartRFQ

39608000000

Littelfuse Inc.In Stock: 215539608000000 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The Littelfuse TE5® 39608000000 qualifies as a parametric equivalent to the 39708000000 based on the following critical electrical and mechanical parameters:

Matching Parameters:

• Current Rating: 800 mA (identical)
• Voltage Rating (AC): 125 V (identical)
• Response Time: Slow Blow (identical)
• Mounting Type: Through Hole (identical)
• Fuse Type: Board Mount (Cartridge Style Excluded) (identical)
• Package / Case: Radial, Box (identical)
• Physical Dimensions: 0.335" L x 0.157" W x 0.315" H / 8.50mm x 4.00mm x 8.00mm (identical)
• Operating Temperature Range: -40°C to 85°C (identical)
• Approval Agencies: cUL, UL (identical)
• RoHS Status: ROHS3 Compliant (identical)

Differing Parameters:

• Breaking Capacity @ Rated Voltage: 39708000000 = 50A; 39608000000 = 100A
• Melting I²t: 39708000000 = 2.4; 39608000000 = 1.92
• DC Cold Resistance: 39708000000 = 0.1616 Ohms; 39608000000 = 0.125 Ohms
• Packaging Format: 39708000000 = Tape & Box (TB); 39608000000 = Cut Tape (CT)
• Series Designation: 39708000000 = TE5® 397; 39608000000 = TE5® 396

Parameter Comparison

Engineering Selection Recommendations

Both the 39708000000 and 39608000000 are active products manufactured by Littelfuse Inc. and carry identical cUL and UL approvals. They share the same electrical ratings (800 mA, 125 V AC), response characteristics (Slow Blow), mounting configuration (Through Hole), and physical dimensions, making them functionally interchangeable in circuit protection applications.

The 39608000000 substitute offers a higher breaking capacity (100A versus 50A) and lower melting I²t value (1.92 versus 2.4), indicating faster response to fault conditions. Both parts maintain ROHS3 compliance and operate across the identical temperature range (-40°C to 85°C).

Selection between these parts should be based on packaging requirements (Tape & Box versus Cut Tape) and application-specific breaking capacity needs. The substitute part's enhanced breaking capacity provides additional margin in high-fault-current environments.

Frequently Asked Questions (FAQ)

Q: Can the 39608000000 be used as a direct replacement for the 39708000000?

A: Yes. Both parts share identical current rating (800 mA), voltage rating (125 V AC), response time (Slow Blow), mounting type (Through Hole), package case (Radial, Box), and physical dimensions (8.50mm x 4.00mm x 8.00mm). They are functionally equivalent for circuit protection applications.

Q: What is the difference in breaking capacity between these parts?

A: The 39708000000 has a breaking capacity of 50A at rated voltage, while the 39608000000 has 100A. The substitute part provides higher fault current handling capability.

Q: Are there packaging differences between these parts?

A: Yes. The 39708000000 is supplied in Tape & Box (TB) format, while the 39608000000 is supplied in Cut Tape (CT) format. Both are suitable for board mount applications; selection depends on assembly line requirements.

Q: Do both parts have the same certifications?

A: Yes. Both the 39708000000 and 39608000000 carry cUL and UL approvals and are ROHS3 compliant.

Q: What does the difference in melting I²t indicate?

A: The melting I²t value characterizes the thermal energy required to melt the fuse element. The 39608000000 has a lower melting I²t (1.92 versus 2.4), indicating it responds more quickly to overcurrent conditions.

Q: Are both parts suitable for the same operating temperature range?

A: Yes. Both parts operate across -40°C to 85°C.