Littelfuse 39911000000 Equivalent & Substitute Parts

Part Overview

The Littelfuse 39911000000 is a 1 A, 65 V AC/DC board mount fuse with slow blow response characteristics, designed for through hole radial mounting. This component is classified as Active product status and is cULus approved. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, application voltage upgrades, or extended operating temperature requirements.

Substiute Parts

39911000000

Littelfuse Inc.In Stock: 84539911000000 Datasheet

Current PartRFQ

0697W1000-02

Bel Fuse Inc.In Stock: 38050697W1000-02 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

The Bel Fuse Inc. 0697W1000-02 qualifies as a substitute based on the following alignment criteria:

Matching Parameters:

• Current Rating: 1 A (identical)
• Response Time: Slow Blow (identical)
• Mounting Type: Through Hole (identical)
• Package / Case: Radial, Box (identical)
• RoHS Status: ROHS3 Compliant (identical)

Enhanced Parameters:

• Voltage Rating - AC: 350 V (exceeds 65 V requirement)
• Voltage Rating - DC: 72 V (exceeds 65 V requirement)
• Operating Temperature Range: -55°C ~ 125°C (extends beyond -40°C ~ 85°C)
• Breaking Capacity: 100 A (exceeds 50 A)

The 0697W1000-02 provides higher voltage and temperature ratings within the same mechanical form factor and current class, making it suitable for applications requiring enhanced electrical specifications.

Parameter Comparison

Engineering Selection Recommendations

Littelfuse 39911000000 is appropriate for applications operating within 65 V AC/DC specifications and -40°C to 85°C temperature range with cULus certification requirements.

Bel Fuse 0697W1000-02 is appropriate for applications requiring higher voltage margins (350 V AC / 72 V DC), extended temperature operation (-55°C to 125°C), or multi-standard compliance (AEC-Q200, CQC, cURus, PSE, VDE). The substitute maintains identical current rating and response characteristics while providing enhanced electrical and thermal performance.

Both parts maintain ROHS3 compliance and identical mechanical mounting interfaces.

Frequently Asked Questions (FAQ)

Q: Can the Bel Fuse 0697W1000-02 directly replace the Littelfuse 39911000000?

A: Yes, within the electrical specifications of the original application. The substitute maintains 1 A current rating, slow blow response, and identical through hole radial mounting. Verify that the application circuit can accommodate the higher voltage ratings without adverse effects.

Q: What is the primary difference between these parts?

A: The Bel Fuse substitute provides higher voltage ratings (350 V AC vs. 65 V AC; 72 V DC vs. 65 V DC) and extended operating temperature range (-55°C to 125°C vs. -40°C to 85°C), with additional international certifications.

Q: Are the physical dimensions compatible?

A: Yes. Both parts use radial, box package configuration with similar dimensions (Littelfuse: 8.50mm L x 4.00mm W x 8.00mm H; Bel Fuse: 8.35mm L x 4.00mm W x 7.80mm H), ensuring mechanical compatibility in through hole applications.

Q: Does the substitute affect circuit performance?

A: The DC cold resistance differs slightly (0.065 Ohms vs. 0.082 Ohms). For applications sensitive to resistance values, this variance should be evaluated against circuit design tolerances.

Q: Which certifications apply to each part?

A: Littelfuse 39911000000 carries cULus approval. Bel Fuse 0697W1000-02 carries AEC-Q200, CQC, cURus, PSE, and VDE approvals, providing broader international compliance coverage.