Littelfuse 0251003.NF030L Board Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0251003.NF030L is a 3 A, 125 VAC/VDC board mount fuse in the PICO® II 251 series, designed for through-hole axial mounting applications. This fast-blow fuse is an active product with full regulatory compliance across multiple approval agencies. Substitute parts are identified based on identical electrical and mechanical specifications, with variations limited to packaging format only.

Substiute Parts

0251003.NF030L

Littelfuse Inc.In Stock: 11300251003.NF030L Datasheet

Current PartRFQ

0251003.HAT1L

Littelfuse Inc.In Stock: 12070251003.HAT1L Datasheet

Parametric EquivalentRFQ

0251003.MAT1L

Littelfuse Inc.In Stock: 38430251003.MAT1L Datasheet

Parametric EquivalentRFQ

0251003.NAT1L

Littelfuse Inc.In Stock: 51260251003.NAT1L Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 0251003.NF030L are determined by strict equivalence across all electrical and mechanical parameters. The following criteria define substitutability:

• Current Rating: 3 A (exact match required)
• Voltage Rating: 125 VAC / 125 VDC (exact match required)
• Response Time: Fast Blow (exact match required)
• Breaking Capacity: 50 A AC / 300 A DC (exact match required)
• Melting I²t: 1.19 (exact match required)
• DC Cold Resistance: 0.0295 Ohms (exact match required)
• Operating Temperature Range: -55°C to 125°C (exact match required)
• Physical Dimensions: 0.110" Dia x 0.280" L (exact match required)
• Mounting Type: Through Hole Axial (exact match required)
• Series: PICO® II 251 (exact match required)
• Regulatory Compliance: CCC, CSA, cURus, PSE, TUV (exact match required)

The only parameter that varies among substitute parts is the packaging format (Tape & Box versus Cut Tape). All substitute parts maintain identical electrical performance and physical specifications.

Parameter Comparison

Engineering Selection Recommendations

All four parts—0251003.NF030L, 0251003.HAT1L, 0251003.MAT1L, and 0251003.NAT1L—are functionally equivalent and directly interchangeable in circuit applications. Selection between these parts should be based on packaging and inventory requirements:

• 0251003.NF030L: Tape & Box packaging format. Use when bulk quantities with protective packaging are required for storage or distribution.

• 0251003.HAT1L: Cut Tape packaging format. Inventory: 1110 pcs. Use for automated assembly processes or when cut tape format is preferred.

• 0251003.MAT1L: Cut Tape packaging format. Inventory: 3818 pcs. Highest inventory availability in cut tape format.

• 0251003.NAT1L: Cut Tape packaging format. Inventory: 5058 pcs. Maximum inventory availability across all substitute options.

All parts maintain active product status and carry identical regulatory certifications (CCC, CSA, cURus, PSE, TUV) and ROHS3 compliance. Selection does not impact electrical performance, thermal characteristics, or safety ratings.

Frequently Asked Questions (FAQ)

Q: Can 0251003.HAT1L, 0251003.MAT1L, or 0251003.NAT1L be used as direct replacements for 0251003.NF030L?

A: Yes. All substitute parts are parametrically equivalent across all electrical and mechanical specifications. They are direct replacements with no circuit modifications required.

Q: What is the difference between these parts?

A: The only difference is packaging format. The main part (0251003.NF030L) is supplied in Tape & Box format, while the substitute parts (0251003.HAT1L, 0251003.MAT1L, 0251003.NAT1L) are supplied in Cut Tape format. Electrical performance and physical dimensions are identical.

Q: Does packaging format affect fuse performance?

A: No. Packaging format is a supply and handling consideration only. It does not affect electrical characteristics, response time, breaking capacity, or any other performance parameter.

Q: Are all parts ROHS3 compliant?

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

Q: Which substitute part should I select if inventory is a concern?

A: 0251003.NAT1L has the highest inventory availability at 5058 pcs, followed by 0251003.MAT1L at 3818 pcs. Both are functionally identical to the main part.

Q: Can these parts be used interchangeably in automated assembly?

A: Yes. The Cut Tape packaged parts (0251003.HAT1L, 0251003.MAT1L, 0251003.NAT1L) are suitable for automated pick-and-place assembly. The Tape & Box format (0251003.NF030L) is better suited for manual assembly or bulk storage.

Q: Do all parts have the same operating temperature range?

A: Yes. All parts operate across the identical temperature range of -55°C to 125°C.