Littelfuse 0279005.V Board Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0279005.V is a 5 A, 125 V AC/DC board mount fuse with fast blow response characteristics, designed for through-hole radial mounting in electronic circuits. This component is classified as Active product status with full CSA, QPL, and UL approval certifications. Substitute parts are identified when equivalent electrical performance, mechanical compatibility, and regulatory compliance can be maintained across the specified parameter set.

Substiute Parts

0279005.V

Littelfuse Inc.In Stock: 11900279005.V Datasheet

Current PartRFQ

0273005.H

Littelfuse Inc.In Stock: 11830273005.H Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 0279005.V is determined by strict equivalence across the following critical parameters:

• Current Rating: 5 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: 10 kA (exact match required)
• Melting I²t: 2.21 (exact match required)
• Operating Temperature Range: -55°C ~ 85°C (exact match required)
• Physical Dimensions: 0.250" Dia x 0.350" H (exact match required)
• DC Cold Resistance: 0.0156 Ohms (exact match required)
• Regulatory Compliance: CSA, QPL, UL certifications (exact match required)

The substitute part 0273005.H meets all specified parameters and is classified as a parametric equivalent.

Parameter Comparison

Engineering Selection Recommendations

Both the 0279005.V and 0273005.H are Active status products manufactured by Littelfuse Inc. with identical electrical, mechanical, and regulatory specifications. The parts differ only in series designation (MICRO™ 279 versus MICRO™ 273) while maintaining complete parameter equivalence.

Selection between these parts may be based on inventory availability. The 0273005.H currently maintains 1143 pieces in stock, while the 0279005.V maintains 1086 pieces. Both parts carry full CSA, QPL, and UL certifications, ROHS3 compliance, and REACH unaffected status, ensuring regulatory compatibility in equivalent applications.

Frequently Asked Questions (FAQ)

Q: Can the 0273005.H be used as a direct replacement for the 0279005.V?

A: Yes. The 0273005.H is a parametric equivalent with identical electrical ratings (5 A, 125 V AC/DC), response time (Fast Blow), breaking capacity (10 kA), melting I²t (2.21), physical dimensions (0.250" Dia x 0.350" H), and regulatory certifications (CSA, QPL, UL). Both are through-hole radial board mount fuses with identical operating temperature ranges and DC cold resistance.

Q: What is the difference between the 0279005.V and 0273005.H?

A: The parts are functionally equivalent. The primary difference is the series designation: 0279005.V belongs to the MICRO™ 279 series, while 0273005.H belongs to the MICRO™ 273 series. All electrical, mechanical, and compliance parameters are identical.

Q: Are both parts suitable for the same circuit applications?

A: Yes. Both parts meet identical specifications for current rating, voltage rating, response time, breaking capacity, and operating temperature range. They are mechanically compatible with the same through-hole radial mounting footprint and package dimensions.

Q: Do both parts have the same regulatory approvals?

A: Yes. Both the 0279005.V and 0273005.H carry CSA, QPL, and UL certifications. Both are ROHS3 compliant and REACH unaffected, ensuring equivalent regulatory compliance.

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

A: The melting I²t value for both parts is 2.21. This parameter defines the thermal energy required to melt the fuse element and is critical for circuit protection coordination. Identical I²t values ensure equivalent protection characteristics in the circuit.

Q: Can these fuses be used in both AC and DC circuits?

A: Yes. Both parts are rated for 125 V AC and 125 V DC operation with a 5 A current rating, making them suitable for dual-voltage applications within the specified voltage and current limits.