Littelfuse 0272.500V Equivalent & Substitute Parts

Part Overview

The Littelfuse 0272.500V is a board mount fuse rated for 500 mA at 125 V AC/DC with fast blow response characteristics. This component is designed for through-hole radial mounting in vertical orientation and is actively manufactured. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity for applications requiring identical electrical and mechanical specifications.

Substiute Parts

0272.500V

Littelfuse Inc.In Stock: 8220272.500V Datasheet

Current PartRFQ

0272.500H

LittelfuseIn Stock: 11420272.500H Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Littelfuse 0272.500V is determined by strict equivalence across the following critical parameters:

• Current Rating: 500 mA
• Voltage Rating: 125 V AC and 125 V DC
• Response Time: Fast Blow
• Mounting Type: Through Hole
• Package / Case: Radial, Can, Vertical
• Breaking Capacity: 10 kA
• Melting I²t: 0.0716
• Physical Dimensions: 0.235" Dia x 0.287" H
• DC Cold Resistance: 0.167 Ohms
• Approval Agencies: CSA, QPL, UL

The substitute part 0272.500H meets all specified parameters and is manufactured by Littelfuse within the same MICRO™ 272 series. Both parts are active products with identical electrical performance and mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

Both the 0272.500V and 0272.500H are active products manufactured by Littelfuse and carry identical certifications from CSA, QPL, and UL. Selection between these parts is based on availability and procurement requirements rather than technical differentiation. Both parts comply with ROHS3 and are unaffected by REACH regulations. The substitute part 0272.500H provides equivalent performance and reliability for applications requiring 500 mA fast blow fuse protection at 125 V AC/DC with through-hole radial mounting.

Frequently Asked Questions (FAQ)

Q: Can the 0272.500H be used as a direct replacement for the 0272.500V?

A: Yes. The 0272.500H is a parametric equivalent with identical current rating, voltage rating, response time, breaking capacity, physical dimensions, and all electrical characteristics. Both parts are certified by the same approval agencies and comply with the same regulatory standards.

Q: Are there any differences in mounting or PCB layout considerations?

A: No. Both parts use identical through-hole radial mounting in vertical orientation with the same physical dimensions (0.235" Dia x 0.287" H). PCB footprints and mounting requirements are identical.

Q: What is the significance of the fast blow response time?

A: Fast blow fuses are designed to interrupt circuits quickly in response to overcurrent conditions. Both the 0272.500V and 0272.500H provide identical fast blow characteristics with a melting I²t of 0.0716, ensuring consistent protection performance.

Q: Are both parts suitable for AC and DC applications?

A: Yes. Both parts are rated for 125 V AC and 125 V DC operation across the full operating temperature range of -55°C to 125°C.

Q: What is the DC cold resistance specification used for?

A: DC cold resistance (0.167 Ohms) is a measure of the fuse element resistance at room temperature and is used in circuit design calculations to determine voltage drop and power dissipation under normal operating conditions.