Littelfuse 0279.750V Board Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0279.750V is a 750 mA, 125 V AC/DC board mount fuse featuring fast blow response characteristics. This component is part of the MICRO™ 279 series and is designed for through-hole radial mounting in vertical orientation. The part maintains active product status with 1072 units currently in stock. Alternative equivalent parts may be required due to supply chain considerations, design revisions, or inventory availability.

Substiute Parts

0279.750V

Littelfuse Inc.In Stock: 10990279.750V Datasheet

Current PartRFQ

0273.750V

Littelfuse Inc.In Stock: 9050273.750V Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The Littelfuse 0273.750V qualifies as a parametric equivalent to the 0279.750V based on identical electrical and mechanical specifications. Substitution is valid when the following critical parameters match:

• Current Rating: 750 mA
• Voltage Rating: 125 V AC / 125 V DC
• Response Time: Fast Blow
• Mounting Type: Through Hole
• Package / Case: Radial, Can, Vertical
• Breaking Capacity: 10 kA
• Melting I²t: 0.09
• Physical Dimensions: 0.250" Dia x 0.350" H
• DC Cold Resistance: 0.293 Ohms
• Approval Agencies: CSA, QPL, UL
• Compliance: ROHS3 Compliant, REACH Unaffected

Both parts belong to the Littelfuse MICRO™ series and maintain identical thermal, electrical, and mechanical characteristics, enabling direct substitution in circuit protection applications.

Parameter Comparison

Engineering Selection Recommendations

Both the 0279.750V and 0273.750V maintain active product status with full regulatory compliance. Selection between these parts should be based on inventory availability and supply chain requirements. The 0279.750V (MICRO™ 279 series) currently has 1072 units in stock, while the 0273.750V (MICRO™ 273 series) has 805 units available. Both parts carry identical certifications from CSA, QPL, and UL, and both comply with ROHS3 and REACH requirements. The electrical and mechanical specifications are identical, ensuring functional interchangeability in all circuit protection applications within the specified voltage and current parameters.

Frequently Asked Questions (FAQ)

Q: Can the 0273.750V directly replace the 0279.750V in existing designs?

A: Yes. Both parts are parametric equivalents with identical current ratings (750 mA), voltage ratings (125 V AC/DC), response characteristics (Fast Blow), physical dimensions (0.250" Dia x 0.350" H), and electrical properties (0.293 Ohms DC cold resistance). Direct substitution is valid for all circuit protection applications.

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

A: No. Both parts use identical through-hole radial mounting in vertical orientation with the same physical footprint. PCB layout modifications are not required for substitution.

Q: Do both parts meet the same regulatory and compliance standards?

A: Yes. Both the 0279.750V and 0273.750V carry identical approvals from CSA, QPL, and UL. Both are ROHS3 compliant and REACH unaffected, meeting the same environmental and safety requirements.

Q: What is the difference between the MICRO™ 279 and MICRO™ 273 series designations?

A: The series designation reflects internal Littelfuse product line organization. From an engineering perspective, the parametric specifications are identical, and the parts are functionally equivalent for all specified applications.

Q: Which part should be selected based on availability?

A: Selection should be based on current inventory levels and supply chain lead times. The 0279.750V has higher current stock (1072 units) compared to the 0273.750V (805 units). Both parts maintain active product status with equivalent delivery and support.