Littelfuse 0278.002V Equivalent & Substitute Parts

Part Overview

The Littelfuse 0278.002V is a 2 mA board mount radial fuse rated for 125 V AC/DC operation. This component is part of the MICRO™ 278 series and is actively manufactured. Finding equivalent substitute parts becomes necessary when managing inventory across multiple suppliers, addressing supply chain constraints, or standardizing component selections across production batches while maintaining identical electrical and mechanical performance.

Substiute Parts

0278.002V

Littelfuse Inc.In Stock: 7170278.002V Datasheet

Current PartRFQ

0272.002V

Littelfuse Inc.In Stock: 9940272.002V Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The Littelfuse 0272.002V qualifies as a parametric equivalent to the 0278.002V based on matching all critical electrical and mechanical specifications. Substitution is valid when the following parameters are identical:

• Current Rating: 2 mA
• Voltage Rating (AC/DC): 125 V
• Response Time: Fast Blow
• Mounting Type: Through Hole
• Package / Case: Radial, Can, Vertical
• Breaking Capacity @ Rated Voltage: 10 kA
• Physical Dimensions: 0.235" Dia x 0.287" H (5.97 mm x 7.30 mm)
• Operating Temperature Range: -55°C ~ 125°C
• DC Cold Resistance: 2200 Ohms
• Approval Agencies: CSA, QPL, UL
• RoHS Compliance: ROHS3 Compliant

The primary difference between these parts is the series designation (MICRO™ 278 versus MICRO™ 272), which does not affect electrical performance or mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

Both the 0278.002V and 0272.002V 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, supplier lead times, or procurement preferences, as they are functionally interchangeable in all applications requiring a 2 mA, 125 V AC/DC fast-blow board mount fuse with through-hole radial mounting. Both parts maintain full compliance with CSA, QPL, and UL standards, as well as ROHS3 and REACH requirements.

Frequently Asked Questions (FAQ)

Q: Can the 0272.002V be used as a direct replacement for the 0278.002V?

A: Yes. The 0272.002V is a parametric equivalent with identical current rating, voltage rating, response time, mounting type, physical dimensions, breaking capacity, and regulatory certifications. Direct substitution is valid for all applications.

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

A: The series designation indicates different product lines within Littelfuse's MICRO fuse family. For the 2 mA, 125 V AC/DC specifications, both series provide identical electrical and mechanical performance.

Q: Are the physical dimensions identical between these parts?

A: Yes. Both parts have identical dimensions of 0.235" Dia x 0.287" H (5.97 mm x 7.30 mm) and use the same radial, can, vertical package configuration, ensuring identical PCB footprint compatibility.

Q: Do both parts meet the same regulatory standards?

A: Yes. Both the 0278.002V and 0272.002V carry identical approvals from CSA, QPL, and UL, and both are ROHS3 compliant and REACH unaffected.

Q: What is the operating temperature range for these fuses?

A: Both parts operate across the identical temperature range of -55°C to 125°C.

Q: Is there any difference in DC cold resistance between these parts?

A: No. Both parts have identical DC cold resistance of 2200 Ohms.