Littelfuse 0263003.WAT1L Board Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0263003.WAT1L is a 3A 250VAC board mount fuse in axial package configuration, designed for through-hole PCB mounting applications. This fast-blow fuse is part of the PICO® II 263 series and maintains active product status with full regulatory compliance. Substitute parts are identified when identical electrical and mechanical specifications are maintained across different packaging formats, ensuring functional interchangeability in circuit protection applications.

Substiute Parts

0263003.WAT1L

Littelfuse Inc.In Stock: 9710263003.WAT1L Datasheet

Current PartRFQ

0263003.HAT1L

Littelfuse Inc.In Stock: 18320263003.HAT1L Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 0263003.WAT1L is determined by strict equivalence across the following critical parameters:

• Current Rating: 3 A (exact match required)
• Voltage Rating (AC): 250 V (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: 50 A (exact match required)
• Melting I²t: 1.77 (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)
• Size / Dimension: 0.155" Dia x 0.280" L (3.94mm x 7.11mm) (exact match required)
• DC Cold Resistance: 0.0274 Ohms (exact match required)
• Series: PICO® II 263 (exact match required)
• Regulatory Compliance: CSA, PSE, UR (exact match required)

The only permitted variation is packaging format (Tape & Box versus Cut Tape), which does not affect electrical or mechanical performance in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

Both the 0263003.WAT1L and 0263003.HAT1L are active products from Littelfuse Inc. with identical electrical and mechanical specifications. Selection between these parts should be based on packaging and supply chain requirements:

• 0263003.WAT1L (Tape & Box packaging) is suitable for applications requiring bulk quantities with protective packaging for storage and handling.
• 0263003.HAT1L (Cut Tape packaging) is suitable for automated assembly processes and applications with specific tape reel requirements.

Both parts maintain full compliance with CSA, PSE, and UR regulatory standards and are ROHS3 compliant. The choice between these substitutes does not affect circuit performance, thermal characteristics, or breaking capacity.

Frequently Asked Questions (FAQ)

Q: Can 0263003.HAT1L be used as a direct replacement for 0263003.WAT1L in production?

A: Yes. Both parts are electrically and mechanically identical. The only difference is packaging format (Tape & Box versus Cut Tape). Selection depends on assembly process requirements and supply chain logistics.

Q: Are there any performance differences between these two part numbers?

A: No. Both parts have identical current ratings (3A), voltage ratings (250VAC), response time (Fast Blow), breaking capacity (50A), melting I²t (1.77), operating temperature range (-55°C ~ 125°C), and physical dimensions (0.155" Dia x 0.280" L).

Q: Do both parts meet the same regulatory certifications?

A: Yes. Both 0263003.WAT1L and 0263003.HAT1L carry identical approvals from CSA, PSE, and UR, and are ROHS3 compliant.

Q: What is the difference between Tape & Box and Cut Tape packaging?

A: Tape & Box packaging provides protective boxing around the tape reel for storage and manual handling. Cut Tape packaging is the tape format without the protective box, typically used for automated pick-and-place assembly systems.

Q: Can these parts be mixed in the same circuit design?

A: Yes. Since all electrical and mechanical parameters are identical, these parts can be used interchangeably within the same circuit design without any functional impact.