Littelfuse 0278.015V Board Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0278.015V is a 15 mA, 125 V AC/DC board mount fuse with fast blow response characteristics, designed for through-hole radial mounting in electronic circuits requiring overcurrent protection. This component is part of the MICRO™ 278 series and maintains active product status with full regulatory compliance. Substitute parts become necessary when addressing supply chain constraints, inventory availability, or design flexibility requirements while maintaining identical electrical and mechanical performance specifications.

Substiute Parts

0278.015V

Littelfuse Inc.In Stock: 10250278.015V Datasheet

Current PartRFQ

0272.015V

Littelfuse Inc.In Stock: 12580272.015V Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The Littelfuse 0272.015V qualifies as a parametric equivalent to the 0278.015V based on strict alignment across all critical electrical and mechanical parameters. Substitution eligibility is determined by the following criteria:

• Current Rating: Both parts rated at 15 mA
• Voltage Ratings: Identical AC and DC ratings at 125 V
• Response Characteristics: Both Fast Blow fuses with matching Melting I²t value (1.23E-06)
• Breaking Capacity: Both rated at 10 kA @ rated voltage
• Mechanical Compatibility: Identical package type (Radial, Can, Vertical), dimensions (0.235" Dia x 0.287" H), and through-hole mounting
• Thermal Performance: Matching operating temperature range (-55°C ~ 125°C) and DC cold resistance (44 Ohms)
• Regulatory Compliance: Both ROHS3 compliant with CSA, QPL, and UL approvals

The primary distinction between these parts lies in their series designation (MICRO™ 278 versus MICRO™ 272), which reflects internal design evolution within Littelfuse's product line while maintaining functional equivalence.

Parameter Comparison

Engineering Selection Recommendations

Both the 0278.015V and 0272.015V maintain active product status with full regulatory compliance across CSA, QPL, and UL certifications. Selection between these parts should be based on availability and supply chain considerations. The 0272.015V currently shows higher inventory availability (1162 units versus 974 units), making it a viable alternative when supply constraints affect the primary part number. Both components satisfy ROHS3 compliance requirements and carry identical electrical performance characteristics, ensuring direct functional interchangeability in circuit applications.

Frequently Asked Questions (FAQ)

Q: Can the 0272.015V be used as a direct replacement for the 0278.015V in existing designs?

A: Yes. Both parts are electrically and mechanically identical across all specified parameters, including current rating, voltage ratings, response time, package dimensions, and thermal characteristics. No circuit modifications are required.

Q: Are there any differences in approval certifications between these parts?

A: No. Both the 0278.015V and 0272.015V carry identical approvals from CSA, QPL, and UL, ensuring equivalent regulatory compliance for all applications.

Q: What determines the substitution eligibility between these two part numbers?

A: Substitution is based on matching electrical parameters (15 mA current rating, 125 V AC/DC voltage ratings, Fast Blow response, 10 kA breaking capacity, 1.23E-06 Melting I²t), mechanical compatibility (identical radial can vertical package and 5.97mm x 7.30mm dimensions), thermal performance (matching operating temperature range and DC cold resistance), and regulatory compliance (ROHS3 status and agency approvals).

Q: Do these parts have identical physical dimensions for PCB layout purposes?

A: Yes. Both parts share identical dimensions of 0.235" Dia x 0.287" H (5.97mm x 7.30mm) and use the same through-hole radial mounting configuration, ensuring direct PCB footprint compatibility.

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

A: The series designation reflects internal product line evolution within Littelfuse's MICRO fuse portfolio. From an engineering standpoint, both series maintain identical electrical and mechanical specifications for this 15 mA, 125 V rating, making them functionally equivalent for circuit protection applications.