Littelfuse 37308000000 Equivalent & Substitute Parts

Part Overview

The Littelfuse 37308000000 is an 800 mA, 250 V AC/DC board mount fuse with fast blow response time, designed for through hole radial mounting in vertical orientation. This TR5® 373 series fuse is actively manufactured and widely used in circuit protection applications requiring reliable overcurrent protection. Substitute parts are identified when equivalent electrical and mechanical parameters are maintained, allowing for design flexibility, inventory optimization, or supply chain continuity.

Substiute Parts

37308000000

Littelfuse Inc.In Stock: 79837308000000 Datasheet

Current PartRFQ

37008000000

Littelfuse Inc.In Stock: 128537008000000 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Littelfuse 37308000000 is based on strict equivalence of the following critical parameters:

• Current Rating: 800 mA (exact match required)
• Voltage Rating: 250 V AC (exact match required)
• Response Time: Fast Blow (exact match required)
• Mounting Type: Through Hole (exact match required)
• Package / Case: Radial, Can, Vertical (exact match required)
• Physical Dimensions: 0.335" Dia x 0.315" H / 8.50mm x 8.00mm (exact match required)
• Operating Temperature Range: -40°C ~ 85°C (exact match required)

The Littelfuse 37008000000 meets all these criteria and is classified as a parametric equivalent. Differences in breaking capacity, melting I²t, packaging format (Cut Tape vs. Tape & Box), and approval agency certifications do not affect functional substitutability for applications where the primary electrical and mechanical specifications are the governing factors.

Parameter Comparison

Engineering Selection Recommendations

Both the Littelfuse 37308000000 and 37008000000 are active products from the same manufacturer with identical electrical and mechanical specifications for circuit protection applications. Selection between these parts should be based on:

• Approval agency requirements for the target application (CSA/cULus vs. CCC/cURus/SEMKO/VDE)
• Packaging requirements (Tape & Box for bulk handling vs. Cut Tape for automated assembly)
• Breaking capacity tolerance (50A vs. 35A) if application-specific fault current levels are a design consideration
• Inventory availability and supply chain lead times

Both parts maintain ROHS3 compliance and operate across the identical temperature range, ensuring regulatory and environmental consistency.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 37008000000 be used as a direct replacement for the 37308000000 in existing designs?

A: Yes, the 37008000000 is a parametric equivalent. Both parts share identical current rating (800 mA), voltage rating (250 V AC), response time (Fast Blow), mounting type (Through Hole), package configuration (Radial, Can, Vertical), and physical dimensions (8.50mm x 8.00mm). The parts are electrically and mechanically interchangeable.

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

A: The 37308000000 has a breaking capacity of 50A at rated voltage, while the 37008000000 has a breaking capacity of 35A. Breaking capacity defines the maximum fault current the fuse can safely interrupt. Application-specific fault current analysis determines whether the lower breaking capacity is acceptable.

Q: Are there packaging differences between these parts?

A: Yes. The 37308000000 is supplied in Tape & Box (TB) format, suitable for bulk component handling. The 37008000000 is supplied in Cut Tape (CT) format, optimized for automated pick-and-place assembly. Both formats contain the same fuse component.

Q: Do these fuses have different approval certifications?

A: The certifications differ. The 37308000000 carries CSA and cULus approvals. The 37008000000 carries CCC, cURus, SEMKO, and VDE approvals. Design requirements and regional regulations determine which certification set is necessary.

Q: Are both parts currently in production?

A: Yes, both the 37308000000 and 37008000000 are active products from Littelfuse Inc., ensuring ongoing availability and support.