Littelfuse 0251.375MAT1L Board Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0251.375MAT1L is an active, board mount axial fuse rated at 375 mA with 125 V AC/DC voltage capability. This fast-blow fuse is designed for through-hole PCB mounting in the PICO® II 251 series and is certified by CSA and cURus. Finding equivalent substitute parts is necessary to ensure supply chain continuity, manage inventory across multiple procurement channels, and maintain design flexibility when the primary part number becomes unavailable or when alternative sourcing improves cost efficiency.

Substiute Parts

0251.375MAT1L

LittelfuseIn Stock: 12900251.375MAT1L Datasheet

Current PartRFQ

0251.375HAT1L

Littelfuse Inc.In Stock: 11140251.375HAT1L Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 0251.375MAT1L are determined by strict equivalence across the following critical parameters:

• Current Rating: 375 mA (exact match required)
• Voltage Rating: 125 V AC and 125 V DC (exact match required)
• Response Time: Fast Blow (exact match required)
• Mounting Type: Through Hole (exact match required)
• Package / Case: Axial (exact match required)
• Breaking Capacity @ Rated Voltage: 50A AC, 300A DC (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)
• Physical Dimensions: 0.110" Dia x 0.280" L (exact match required)
• Approval Certifications: CSA, cURus (exact match required)

The substitute part 0251.375HAT1L meets all these criteria and is therefore a direct parametric equivalent within the PICO® II 251 series.

Parameter Comparison

Engineering Selection Recommendations

Both the 0251.375MAT1L and 0251.375HAT1L are active products from Littelfuse with identical electrical and mechanical specifications. Both parts carry CSA and cURus certifications and maintain ROHS3 compliance. Selection between these parts may be based on inventory availability, procurement lead times, or supplier preference, as they are direct parametric equivalents with no functional differentiation. Both parts are suitable for applications requiring 375 mA fast-blow protection at 125 V AC/DC in through-hole axial configurations.

Frequently Asked Questions (FAQ)

Q: Can the 0251.375HAT1L be used as a direct replacement for the 0251.375MAT1L?

A: Yes. The 0251.375HAT1L is a direct parametric equivalent. All electrical ratings, mechanical dimensions, response characteristics, breaking capacity, and regulatory certifications are identical.

Q: Are there any differences in packaging or handling between these two part numbers?

A: Both parts are supplied in Cut Tape (CT) packaging. Physical dimensions, case style, and mounting configuration are identical.

Q: Do both parts meet the same regulatory certifications?

A: Yes. Both the 0251.375MAT1L and 0251.375HAT1L carry CSA and cURus approvals and are ROHS3 compliant.

Q: What determines whether a fuse can substitute for the 0251.375MAT1L?

A: A substitute fuse must match all of the following: 375 mA current rating, 125 V AC and DC voltage ratings, fast-blow response time, through-hole mounting, axial package style, 50A AC / 300A DC breaking capacity, 0.0296 melting I²t, -55°C to 125°C operating temperature range, 0.110" Dia x 0.280" L physical dimensions, and CSA/cURus certifications.

Q: Can fuses with different current ratings be used interchangeably?

A: No. Current rating is a critical parameter. Only fuses rated at 375 mA are equivalent to the 0251.375MAT1L. Using a fuse with a different current rating will not provide proper circuit protection.

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

A: Fast-blow fuses are designed to open quickly under overcurrent conditions. This characteristic must be matched in any substitute part to ensure the circuit protection scheme functions as designed.