Littelfuse 30302500421 Equivalent & Substitute Parts

Part Overview

The Littelfuse 30302500421 is a board mount fuse rated for 250 mA at 125 V AC / 63 V DC, designed for through-hole radial mounting in a vertical can configuration. This component is part of the TR3® 303 series and maintains Active product status. Substitute parts are identified when identical electrical specifications, mechanical form factors, and regulatory certifications are maintained across alternative part numbers within the same manufacturer's product line.

Substiute Parts

30302500421

Littelfuse Inc.In Stock: 93730302500421 Datasheet

Current PartRFQ

30302500131

Littelfuse Inc.In Stock: 66330302500131 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The Littelfuse 30302500131 qualifies as a parametric equivalent to the 30302500421 based on strict alignment of the following critical parameters:

• Current Rating: 250 mA (identical)
• Voltage Rating - AC: 125 V (identical)
• Voltage Rating - DC: 63 V (identical)
• Response Time: Fast Blow (identical)
• Mounting Type: Through Hole (identical)
• Package / Case: Radial, Can, Vertical (identical)
• Breaking Capacity @ Rated Voltage: 50 A (identical)
• Size / Dimension: 0.236" Dia x 0.315" H (6.00mm x 8.00mm) (identical)
• DC Cold Resistance: 1.15 Ohms (identical)
• Operating Temperature Range: -25°C ~ 70°C (identical)
• Approval Agencies: CSA, UL (identical)
• RoHS Status: ROHS3 Compliant (identical)

Both parts belong to the TR3® 303 series and maintain Active product status. Substitution is valid when circuit design requires identical electrical performance, mechanical fit, and regulatory compliance.

Parameter Comparison

Engineering Selection Recommendations

Both the 30302500421 and 30302500131 are Active products from Littelfuse Inc. with identical electrical and mechanical specifications. Selection between these parts is based on inventory availability and supply chain considerations rather than technical performance differences. Both parts carry CSA and UL approvals and maintain ROHS3 compliance, confirming suitability for regulated applications. The 30302500421 currently has 868 units in stock, while the 30302500131 has 640 units available.

Frequently Asked Questions (FAQ)

Q: Can the 30302500131 be used as a direct replacement for the 30302500421?

A: Yes. Both parts share identical electrical ratings (250 mA, 125 V AC, 63 V DC), response characteristics (Fast Blow), mechanical form factor (Radial, Can, Vertical, 6.00mm x 8.00mm), and regulatory certifications (CSA, UL, ROHS3). Direct substitution is valid for through-hole board mount applications.

Q: Are there any differences in mounting or PCB layout requirements?

A: No. Both parts use identical Through Hole mounting with the same physical dimensions (0.236" Dia x 0.315" H). PCB footprints and lead spacing are equivalent.

Q: Do both parts meet the same regulatory standards?

A: Yes. Both the 30302500421 and 30302500131 carry CSA and UL approvals and are ROHS3 compliant. They are suitable for applications requiring these certifications.

Q: What is the difference between these two part numbers?

A: The provided specifications indicate no technical differences between these parts. Both belong to the TR3® 303 series and maintain identical performance parameters. Differences are limited to inventory lot tracking and supply chain management.

Q: Can I use either part interchangeably in my circuit design?

A: Yes. From an electrical and mechanical standpoint, these parts are interchangeable. Circuit performance and protection characteristics remain identical when either part is used.