Littelfuse 0278003.V Board Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0278003.V is a 3 A, 125 V AC/DC board mount fuse with fast blow response characteristics, designed for through-hole radial mounting in electronic circuits requiring overcurrent protection. This component is classified as Active product status with full CSA, QPL, and UL approvals. Substitute parts become necessary when the primary part number experiences supply constraints, extended lead times, or when design flexibility permits selection from equivalent alternatives within the same electrical and mechanical parameter set.

Substiute Parts

0278003.V

Littelfuse Inc.In Stock: 10990278003.V Datasheet

Current PartRFQ

0272003.H

Littelfuse Inc.In Stock: 10100272003.H Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 0278003.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)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)
• Physical Dimensions: 0.235" Dia x 0.287" H (exact match required)
• DC Cold Resistance: 0.0275 Ohms (exact match required)
• Approval Certifications: CSA, QPL, UL (exact match required)
• RoHS Compliance: ROHS3 Compliant (exact match required)

The substitute part 0272003.H meets all these criteria and is therefore classified as a parametric equivalent.

Parameter Comparison

Engineering Selection Recommendations

Both the 0278003.V and 0272003.H are Active product status components manufactured by Littelfuse Inc. with identical electrical, mechanical, and thermal specifications. Both parts carry CSA, QPL, and UL certifications, confirming compliance with industry standards for board mount fuses. Both are ROHS3 compliant and REACH unaffected, meeting environmental regulatory requirements.

The primary distinction between these parts is series designation: 0278003.V belongs to the MICRO™ 278 series, while 0272003.H belongs to the MICRO™ 272 series. All other parameters—current rating, voltage ratings, response time, breaking capacity, melting I²t, operating temperature range, physical dimensions, DC cold resistance, and approval certifications—are identical.

Selection between these parts should be based on availability, lead time, and design documentation requirements. Both parts are suitable for direct substitution in applications requiring 3 A, 125 V AC/DC fast blow board mount fuses with through-hole radial mounting.

Frequently Asked Questions (FAQ)

Q: Can 0272003.H be used as a direct replacement for 0278003.V?

A: Yes. The 0272003.H meets all electrical, mechanical, and thermal parameter requirements of the 0278003.V. Both parts have identical current ratings (3 A), voltage ratings (125 V AC/DC), response time (fast blow), mounting type (through hole), package configuration (radial, can, vertical), breaking capacity (10 kA), melting I²t (0.759), operating temperature range (-55°C ~ 125°C), physical dimensions (0.235" Dia x 0.287" H), DC cold resistance (0.0275 Ohms), and approval certifications (CSA, QPL, UL).

Q: What is the difference between the MICRO™ 278 and MICRO™ 272 series?

A: Based on the provided specifications, both series share identical electrical and mechanical parameters for the 3 A, 125 V rating. The series designation reflects internal Littelfuse product line organization but does not affect functional equivalence for this application.

Q: Are both parts RoHS and REACH compliant?

A: Yes. Both 0278003.V and 0272003.H are ROHS3 compliant and REACH unaffected, meeting environmental and regulatory requirements for electronic component use.

Q: What certifications do these fuses carry?

A: Both parts are certified by CSA, QPL, and UL, confirming compliance with North American and international standards for board mount fuses.

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, making them suitable for dual-voltage applications.

Q: What is the physical footprint of these fuses?

A: Both parts have identical dimensions of 0.235" diameter by 0.287" height (5.97mm x 7.30mm) in radial, can, vertical configuration, ensuring identical PCB footprint compatibility.