Littelfuse 0278.750V Board Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0278.750V is a 750 mA, 125 V AC/DC board mount fuse designed for through-hole radial, can, vertical mounting applications. This fast-blow fuse is part of the MICRO™ 278 series and is actively manufactured. Substitute parts are identified when equivalent electrical and mechanical parameters are required for component replacement, inventory management, or design flexibility while maintaining circuit protection specifications.

Substiute Parts

0278.750V

Littelfuse Inc.In Stock: 8180278.750V Datasheet

Current PartRFQ

0272.750H

Littelfuse Inc.In Stock: 11060272.750H Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The Littelfuse 0272.750H qualifies as a parametric equivalent to the 0278.750V based on the following critical substitution criteria:

Electrical Parameters (Identical):

• Current Rating: 750 mA
• Voltage Rating - AC: 125 V
• Voltage Rating - DC: 125 V
• Response Time: Fast Blow
• Breaking Capacity @ Rated Voltage: 10 kA
• Melting I²t: 0.09
• DC Cold Resistance: 0.293 Ohms

Mechanical Parameters (Identical):

• Fuse Type: Board Mount (Cartridge Style Excluded)
• Mounting Type: Through Hole
• Package / Case: Radial, Can, Vertical
• Size / Dimension: 0.235" Dia x 0.287" H (5.97 mm x 7.30 mm)

Compliance & Certification (Identical):

• Approval Agency: CSA, QPL, UL
• RoHS Status: ROHS3 Compliant
• REACH Status: REACH Unaffected
• Operating Temperature Range: -55°C ~ 125°C

The substitute part belongs to the MICRO™ 272 series, representing a different design generation within the same product family while maintaining full electrical and mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

Both the 0278.750V and 0272.750H are active products manufactured by Littelfuse Inc. with identical electrical specifications, mechanical dimensions, and regulatory certifications. Selection between these parts may be based on:

• Inventory availability and lead time requirements
• Design generation preference (MICRO™ 278 versus MICRO™ 272 series)
• Supply chain considerations
• Cost optimization within equivalent specifications

Both parts maintain full compliance with CSA, QPL, and UL certifications, ROHS3 compliance, and REACH unaffected status. The identical breaking capacity, melting I²t, and operating temperature range ensure equivalent circuit protection performance in all specified applications.

Frequently Asked Questions (FAQ)

Q: Can the 0272.750H be used as a direct replacement for the 0278.750V?

A: Yes. The 0272.750H is a parametric equivalent with identical current rating (750 mA), voltage ratings (125 V AC/DC), response time (fast blow), mechanical dimensions (0.235" Dia x 0.287" H), mounting type (through hole radial, can, vertical), and all electrical characteristics including breaking capacity (10 kA) and melting I²t (0.09).

Q: Are there any differences in physical mounting between these parts?

A: No. Both parts use identical through-hole radial, can, vertical mounting with the same package dimensions (0.235" Dia x 0.287" H / 5.97 mm x 7.30 mm). PCB footprints and mounting hole spacing are compatible.

Q: Do both parts carry the same regulatory approvals?

A: Yes. Both the 0278.750V and 0272.750H are certified by CSA, QPL, and UL, are ROHS3 compliant, and have REACH unaffected status.

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

A: The series designation indicates different design generations within Littelfuse's product family. Both series maintain identical electrical and mechanical specifications for the 750 mA, 125 V rating. The choice between series is based on availability and supply chain requirements rather than functional differences.

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 identical breaking capacity and response characteristics across both voltage types.