Littelfuse 0274.100V Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0274.100V is a 100 mA, 125 V AC/DC board mount fuse designed for through-hole radial mounting in the MICRO™ 274 series. This fast-blow fuse is actively manufactured and widely used in circuit protection applications requiring compact form factors and reliable performance across industrial and commercial equipment. Substitute parts are identified when equivalent electrical ratings, mechanical compatibility, and regulatory certifications align with the original specification, enabling seamless component replacement in production and field service scenarios.

Substiute Parts

0274.100V

Littelfuse Inc.In Stock: 11250274.100V Datasheet

Current PartRFQ

0273.100H

Littelfuse Inc.In Stock: 15480273.100H Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Littelfuse 0274.100V is determined by strict alignment of the following electrical and mechanical parameters:

Critical Substitution Criteria:

• Current Rating: 100 mA (exact match required)
• Voltage Rating AC: 125 V (exact match required)
• Voltage Rating DC: 125 V (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: 0.000385 (exact match required)
• Size / Dimension: 0.250" Dia x 0.350" H (6.35 mm x 8.89 mm) (exact match required)
• DC Cold Resistance: 1.25 Ohms (exact match required)
• Regulatory Compliance: CSA, QPL, UL certifications (required)
• RoHS Status: ROHS3 Compliant (required)

The Littelfuse 0273.100H meets all substitution criteria and is classified as a parametric equivalent within the MICRO™ series family.

Parameter Comparison

Engineering Selection Recommendations

The Littelfuse 0273.100H is a direct parametric equivalent to the 0274.100V. Both parts are actively manufactured by Littelfuse Inc., carry identical electrical ratings (100 mA, 125 V AC/DC), and share the same mechanical form factor (0.250" Dia x 0.350" H). Both components hold equivalent regulatory certifications (CSA, QPL, UL) and comply with ROHS3 requirements.

Selection between these two parts is based on availability, inventory status, and supply chain considerations rather than technical performance differences. The 0273.100H belongs to the MICRO™ 273 series while the 0274.100V belongs to the MICRO™ 274 series; however, this series designation does not affect electrical or mechanical compatibility in applications requiring 100 mA, 125 V AC/DC board mount fuses with fast-blow response characteristics.

Frequently Asked Questions (FAQ)

Q: Can the 0273.100H replace the 0274.100V in existing designs? A: Yes. The 0273.100H meets all electrical and mechanical specifications of the 0274.100V, including current rating, voltage rating, response time, package dimensions, and regulatory certifications. Direct substitution is permissible without circuit redesign.

Q: Are there differences between the MICRO™ 273 and MICRO™ 274 series? A: The series designation indicates product line classification within Littelfuse's portfolio. For the 100 mA, 125 V AC/DC specifications, both series employ identical electrical characteristics, breaking capacity, melting I²t values, and physical dimensions. Series differences do not impact functional compatibility in this current and voltage rating.

Q: What is the significance of the 10 kA breaking capacity rating? A: Breaking capacity specifies the maximum fault current the fuse can safely interrupt at its rated voltage without rupturing or creating a hazard. Both the 0274.100V and 0273.100H are rated for 10 kA breaking capacity at 125 V, ensuring equivalent protection performance in circuit applications.

Q: Do both parts carry the same regulatory approvals? A: Yes. Both the 0274.100V and 0273.100H hold CSA, QPL, and UL certifications and comply with ROHS3 requirements. Regulatory compliance is identical between the two parts.

Q: What does the melting I²t value indicate? A: Melting I²t (0.000385) represents the thermal energy required to melt the fuse element. This value is identical for both parts and determines the fuse's response to overcurrent conditions. Matching I²t values ensure equivalent protection characteristics.

Q: Are there any operating temperature differences? A: The 0274.100V does not specify an operating temperature range in the provided data. The 0273.100H specifies -55°C ~ 85°C. For applications requiring confirmed temperature performance, the 0273.100H provides explicit operating range documentation.