Littelfuse 0273003.V Board Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0273003.V is a 3 A, 125 V AC/DC board mount fuse with fast blow response time, designed for through-hole radial mounting in electronic circuits. This component belongs to the MICRO™ 273 series and is currently in active production status. Finding equivalent substitute parts becomes necessary when managing inventory across multiple suppliers, addressing supply chain constraints, or standardizing component selections across product lines while maintaining identical electrical and mechanical performance.

Substiute Parts

0273003.V

LittelfuseIn Stock: 9300273003.V Datasheet

Current PartRFQ

0279003.V

Littelfuse Inc.In Stock: 10140279003.V Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Littelfuse 0273003.V is determined by strict equivalence across the following critical parameters:

• Current Rating: 3 A (exact match required)
• Voltage Rating: 125 V AC and 125 V DC (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)
• Breaking Capacity @ Rated Voltage: 10 kA (exact match required)
• Melting I²t: 0.759 (exact match required)
• DC Cold Resistance: 0.0275 Ohms (exact match required)
• Operating Temperature Range: -55°C ~ 85°C (exact match required)
• Approval Agencies: CSA, QPL, UL (exact match required)
• RoHS Status: ROHS3 Compliant (exact match required)

The Littelfuse 0279003.V meets all substitution criteria and is classified as a parametric equivalent. While it belongs to the MICRO™ 279 series rather than the MICRO™ 273 series, all electrical and mechanical specifications are identical to the main part.

Parameter Comparison

Engineering Selection Recommendations

Both the Littelfuse 0273003.V and 0279003.V are active production components with identical electrical and mechanical specifications. Selection between these parts should be based on:

• Inventory availability and lead times from your supply chain
• Existing design documentation and qualification history
• Cost considerations and supplier agreements
• PCB layout and component placement constraints

Both parts carry identical regulatory approvals (CSA, QPL, UL) and comply with ROHS3 and REACH requirements, ensuring equivalent compliance status in end applications. The series designation difference (MICRO™ 273 versus MICRO™ 279) does not affect functional performance or interchangeability.

Frequently Asked Questions (FAQ)

Q: Can the 0279003.V be used as a direct replacement for the 0273003.V on existing PCBs?

A: Yes. The 0279003.V is a parametric equivalent with identical current rating, voltage rating, response time, package dimensions, and all electrical characteristics. No PCB modifications are required.

Q: Are there any differences in approval certifications between these parts?

A: No. Both parts carry identical approvals from CSA, QPL, and UL, and both comply with ROHS3 and REACH requirements.

Q: What is the significance of the series designation difference (MICRO™ 273 vs. MICRO™ 279)?

A: The series designation indicates the product line within Littelfuse's portfolio. Despite different series names, the 0279003.V meets all electrical and mechanical specifications of the 0273003.V and is fully interchangeable.

Q: Are the physical dimensions identical?

A: Yes. Both parts have identical dimensions of 0.250" Dia x 0.350" H (6.35mm x 8.89mm) and use the same radial, can, vertical package configuration.

Q: Can I mix these parts in the same production batch?

A: Yes. Since both parts are parametrically equivalent with identical specifications and approvals, they can be used interchangeably within the same design and production environment.

Q: What is the melting I²t value, and why is it important for substitution?

A: The melting I²t value of 0.759 defines the thermal energy required to melt the fuse element. This parameter must be identical between substitute parts to ensure consistent circuit protection behavior and response characteristics.