Littelfuse 025101.5NAT6L Equivalent & Substitute Parts

Part Overview

The Littelfuse 025101.5NAT6L is a 1.5 A, 125 V AC/DC board mount axial fuse in the PICO® II 251 series. This component is designed for through-hole PCB applications requiring fast-blow protection at low current ratings. The part is active in production with full regulatory compliance (CSA, cURus, PSE, TUV). Substitute parts are identified when packaging format differs while maintaining identical electrical and mechanical specifications, enabling procurement flexibility and supply chain optimization.

Substiute Parts

025101.5NAT6L

Littelfuse Inc.In Stock: 773025101.5NAT6L Datasheet

Current PartRFQ

025101.5HAT1L

LittelfuseIn Stock: 1274025101.5HAT1L Datasheet

Parametric EquivalentRFQ

025101.5MAT1L

Littelfuse Inc.In Stock: 4338025101.5MAT1L Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 025101.5NAT6L are identified based on strict electrical and mechanical parameter equivalence within the PICO® II 251 series. The following parameters determine substitutability:

• Current Rating: 1.5 A (identical)
• Voltage Rating: 125 V AC / 125 V DC (identical)
• Response Time: Fast Blow (identical)
• Mounting Type: Through Hole (identical)
• Package / Case: Axial (identical)
• Physical Dimensions: 0.110" Dia x 0.280" L (identical)
• Breaking Capacity: 50A AC, 300A DC (identical)
• DC Cold Resistance: 0.0823 Ohms (identical)
• Melting I²t: 0.587 (identical)
• Regulatory Approvals: CSA, cURus, PSE, TUV (identical)
• RoHS Status: ROHS3 Compliant (identical)

The identified substitutes differ only in packaging format (Tape & Box versus Cut Tape), which does not affect electrical performance or mechanical compatibility in PCB assembly.

Parameter Comparison

Engineering Selection Recommendations

All three parts—025101.5NAT6L, 025101.5HAT1L, and 025101.5MAT1L—are active production components with identical electrical and mechanical specifications. Selection between these parts is determined by packaging and inventory requirements:

• 025101.5NAT6L: Tape & Box packaging format. Use when bulk quantities with protective packaging are required for storage and handling.
• 025101.5HAT1L: Cut Tape packaging format. Use for automated assembly processes requiring tape-and-reel delivery. Current inventory: 1165 pcs.
• 025101.5MAT1L: Cut Tape packaging format. Use for automated assembly processes requiring tape-and-reel delivery. Current inventory: 4315 pcs.

All parts maintain full compliance with CSA, cURus, PSE, and TUV certifications. ROHS3 compliance is confirmed across all variants. No electrical performance differences exist between packaging formats.

Frequently Asked Questions (FAQ)

Q: Can 025101.5HAT1L and 025101.5MAT1L be used interchangeably with 025101.5NAT6L in PCB assembly?

A: Yes. All three parts are electrically and mechanically identical. The only difference is packaging format (Tape & Box versus Cut Tape). PCB assembly compatibility is not affected by packaging format.

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

A: Tape & Box (TB) provides fuses on continuous tape with protective boxing for storage. Cut Tape (CT) provides fuses on tape segments suitable for automated pick-and-place equipment. Both formats contain identical components.

Q: Are all substitute parts certified to the same regulatory standards?

A: Yes. All three parts carry identical regulatory approvals: CSA, cURus, PSE, and TUV. All are ROHS3 compliant.

Q: Can I substitute 025101.5MAT1L for 025101.5NAT6L in a design already qualified with the original part?

A: Yes, provided your assembly process can accommodate Cut Tape packaging. Electrical and mechanical specifications are identical, and all regulatory certifications match.

Q: What is the melting I²t value, and why is it important?

A: The melting I²t of 0.587 defines the thermal energy required to melt the fuse element. This value is identical across all three parts and determines the fuse's response to overcurrent conditions.

Q: Are there any temperature or environmental differences between these parts?

A: No. All three parts operate across the identical temperature range of -55°C to 125°C and carry the same environmental compliance status (REACH Unaffected).