Littelfuse 0272.005V Equivalent & Substitute Parts

Part Overview

The Littelfuse 0272.005V is a 5 mA, 125 V AC/DC board mount fuse in the MICRO™ 272 series. This through-hole radial fuse is designed for circuit protection in applications requiring fast-blow response characteristics. The part maintains active product status with 819 units in current inventory. Equivalent substitute parts are identified to support procurement flexibility, supply chain continuity, and design standardization across compatible applications.

Substiute Parts

0272.005V

Littelfuse Inc.In Stock: 8730272.005V Datasheet

Current PartRFQ

0278.005V

Littelfuse Inc.In Stock: 10850278.005V Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The Littelfuse 0272.005V has one identified parametric equivalent: the 0278.005V from the MICRO™ 278 series. This substitution is valid based on the following critical parameters that determine functional interchangeability:

• Current Rating: 5 mA (identical)
• Voltage Rating (AC/DC): 125 V / 125 V (identical)
• Fuse Type: Board Mount, Through Hole (identical)
• Package / Case: Radial, Can, Vertical (identical)
• Response Time: Fast Blow (identical)
• Breaking Capacity @ Rated Voltage: 10 kA (identical)
• Operating Temperature Range: -55°C to 125°C (identical)
• Physical Dimensions: 0.235" Dia x 0.287" H (identical)
• DC Cold Resistance: 280 Ohms (identical)
• Melting I²t: 8.1E-09 (identical)
• Approval Agencies: CSA, QPL, UL (identical)
• RoHS Status: ROHS3 Compliant (identical)

The substitute part differs only in series designation (MICRO™ 278 versus MICRO™ 272), with no variation in electrical or mechanical performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

Both the 0272.005V and 0278.005V are active products from Littelfuse Inc. with identical electrical and mechanical specifications. Selection between these parts is based on procurement availability and inventory status rather than technical performance differences.

The 0272.005V is suitable for applications requiring a 5 mA fast-blow fuse rated for 125 V AC/DC operation with through-hole radial mounting. The part carries CSA, QPL, and UL approvals, confirming compliance with recognized safety standards. ROHS3 compliance and unlimited moisture sensitivity level (MSL 1) support use in standard manufacturing and storage environments.

The 0278.005V substitute provides equivalent functionality with higher current inventory availability (1036 units versus 819 units). Both parts are suitable for direct substitution in circuit protection applications where the specified electrical and mechanical parameters are required.

Frequently Asked Questions (FAQ)

Q: Can the 0278.005V be used as a direct replacement for the 0272.005V?

A: Yes. The 0278.005V is a parametric equivalent with identical current rating, voltage rating, fuse type, mounting configuration, response time, breaking capacity, operating temperature range, physical dimensions, and resistance characteristics. Both parts carry the same regulatory approvals (CSA, QPL, UL) and RoHS3 compliance status.

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

A: The series designation indicates different product lines within Littelfuse's fuse portfolio. For the 0272.005V and 0278.005V, the series difference does not affect electrical or mechanical performance. Both deliver identical specifications for current rating, voltage rating, response time, and physical form factor.

Q: Are the physical dimensions identical between these parts?

A: Yes. Both the 0272.005V and 0278.005V have identical dimensions of 0.235" diameter by 0.287" height (5.97 mm x 7.30 mm). They are both radial, can-style, vertical-mount through-hole components suitable for the same PCB footprints.

Q: Do both parts meet the same regulatory standards?

A: Yes. Both the 0272.005V and 0278.005V carry CSA, QPL, and UL approvals. Both are ROHS3 compliant and have unlimited moisture sensitivity level (MSL 1), supporting use in standard manufacturing environments without special handling requirements.

Q: What is the breaking capacity of these fuses?

A: Both parts have a breaking capacity of 10 kA at the rated voltage of 125 V AC/DC. This specification defines the maximum fault current the fuse can safely interrupt without rupturing or creating a hazard.

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

A: Yes. Both the 0272.005V and 0278.005V are rated for 125 V AC and 125 V DC operation, making them suitable for use in either AC or DC circuit protection applications.