Littelfuse 36908000440 Equivalent & Substitute Parts

Part Overview

The Littelfuse 36908000440 is an 800 mA, 300 V AC board mount fuse with slow blow response characteristics, designed for through hole radial mounting in TE5® 369 series applications. This component is classified as Active product status with full RoHS3 compliance and cURus approval. Substitute parts are identified to provide alternative sourcing options when the primary part becomes unavailable or when design requirements necessitate enhanced voltage ratings or expanded operating temperature ranges.

Substiute Parts

36908000440

Littelfuse Inc.In Stock: 95336908000440 Datasheet

Current PartRFQ

0697H0800-01

Bel Fuse Inc.In Stock: 21210697H0800-01 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Littelfuse 36908000440 is determined by the following critical parameters:

Current Rating: Must match at 800 mA. This is the primary functional requirement and cannot be altered.

Response Time: Must remain Slow Blow to maintain circuit protection characteristics consistent with the original design.

Mounting Type & Package: Must be Through Hole with Radial, Box configuration to ensure mechanical and electrical compatibility with existing PCB layouts.

Voltage Rating - AC: The substitute part must meet or exceed the 300 V AC requirement. Higher AC voltage ratings provide enhanced margin and are acceptable for direct substitution.

Approval Certifications: Substitute parts must maintain cURus approval as a minimum requirement for regulatory compliance.

The Bel Fuse Inc. 0697H0800-01 qualifies as a direct substitute based on matching current rating (800 mA), response time (Slow Blow), mounting configuration (Through Hole Radial, Box), and exceeding the AC voltage requirement (350 V AC vs. 300 V AC).

Parameter Comparison

Engineering Selection Recommendations

The Bel Fuse 0697H0800-01 is a qualified substitute for the Littelfuse 36908000440 based on functional equivalence across all critical parameters. Both components maintain Active product status and ROHS3 compliance. The substitute part provides enhanced specifications including higher AC voltage rating (350 V vs. 300 V), expanded operating temperature range (-55°C to 125°C vs. -40°C to 85°C), and additional AEC-Q200 automotive qualification. Physical dimensions are within acceptable tolerance for through hole radial mounting applications. The melting I²t values (3.6 vs. 3.8) are sufficiently close to maintain equivalent thermal protection characteristics.

Frequently Asked Questions (FAQ)

Q: Can the Bel Fuse 0697H0800-01 be used as a direct replacement for the Littelfuse 36908000440?

A: Yes. Both components share identical current ratings (800 mA), response time (Slow Blow), mounting configuration (Through Hole Radial, Box), and fuse type classification. The substitute part meets or exceeds all critical electrical parameters.

Q: What is the significance of the higher AC voltage rating on the substitute part?

A: The Bel Fuse part is rated for 350 V AC compared to 300 V AC on the original. This higher rating provides additional safety margin in applications operating at or near the original 300 V specification and is acceptable for direct substitution.

Q: Are there physical compatibility concerns between these two parts?

A: Physical dimensions are nearly identical. The Bel Fuse part measures 0.329" L x 0.157" W x 0.307" H versus 0.335" L x 0.157" W x 0.315" H for the Littelfuse part. These minor differences do not affect through hole radial mounting compatibility.

Q: Does the substitute part maintain the same regulatory approvals?

A: Both parts carry cURus approval. The Bel Fuse part additionally includes AEC-Q200 automotive qualification, which does not conflict with the original specification and may provide additional assurance for certain applications.

Q: What is the difference in melting I²t values between these parts?

A: The Littelfuse part has a melting I²t of 3.8 while the Bel Fuse part is 3.6. These values are sufficiently close to maintain equivalent thermal protection behavior in circuit applications.

Q: Can the substitute part operate across a wider temperature range?

A: Yes. The Bel Fuse 0697H0800-01 operates from -55°C to 125°C compared to -40°C to 85°C for the Littelfuse part. Applications requiring extended temperature operation can benefit from this expanded range.