Littelfuse 0251007.NAT1L Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0251007.NAT1L is a 7 A, 125 V AC/DC board mount fuse in the PICO® II 251 series, designed for through-hole axial mounting applications. This fast-blow fuse is actively produced and widely used in industrial and consumer electronics requiring overcurrent protection. Substitute parts within this series maintain identical electrical and mechanical specifications, differing only in packaging configuration, which may be necessary for supply chain optimization, inventory management, or specific procurement requirements.

Substiute Parts

0251007.NAT1L

Littelfuse Inc.In Stock: 8880251007.NAT1L Datasheet

Current PartRFQ

0251007.HAT1L

Littelfuse Inc.In Stock: 11010251007.HAT1L Datasheet

Parametric EquivalentRFQ

0251007.MAT1L

Littelfuse Inc.In Stock: 27040251007.MAT1L Datasheet

Parametric EquivalentRFQ

0251007.PAT1L

Littelfuse Inc.In Stock: 11370251007.PAT1L Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

All substitute parts for the 0251007.NAT1L are parametric equivalents within the Littelfuse PICO® II 251 series. Substitution is determined by the following criteria:

Electrical Parameters (Must Match Exactly):

• Current Rating: 7 A
• Voltage Rating: 125 V AC / 125 V DC
• Response Time: Fast Blow
• Breaking Capacity: 50 A AC, 300 A DC
• Melting I²t: 10.4
• DC Cold Resistance: 0.0107 Ohms

Mechanical Parameters (Must Match Exactly):

• Mounting Type: Through Hole
• Package / Case: Axial
• Size / Dimension: 0.110" Dia × 0.280" L (2.80 mm × 7.11 mm)

Variable Parameter (Allows Substitution):

• Packaging Configuration: Tape & Box (TB) or Cut Tape (CT)

All substitute parts maintain identical electrical performance and physical dimensions. Packaging differences do not affect functional compatibility; they reflect only the delivery and handling format.

Parameter Comparison

Engineering Selection Recommendations

All four part numbers are active products manufactured by Littelfuse Inc. and carry identical certifications (CSA, cURus, TUV) and compliance status (ROHS3 Compliant, REACH Unaffected). Selection between these equivalents should be based on:

Packaging Requirements: Choose Tape & Box (TB) packaging for standard board-level assembly or when box storage is preferred. Choose Cut Tape (CT) packaging for automated pick-and-place equipment or high-volume production environments.

Inventory Availability: 0251007.MAT1L offers the highest current stock (2612 Pcs), followed by 0251007.HAT1L (1012 Pcs), 0251007.PAT1L (1068 Pcs), and 0251007.NAT1L (778 Pcs).

Functional Interchangeability: All parts are electrically and mechanically identical. Direct substitution is valid for any application requiring a 7 A, 125 V AC/DC fast-blow board mount fuse with axial through-hole mounting.

Frequently Asked Questions (FAQ)

Q: Can I substitute 0251007.MAT1L for 0251007.NAT1L in my circuit board design? A: Yes. Both parts are parametric equivalents with identical electrical ratings (7 A, 125 V AC/DC), response characteristics (fast-blow), breaking capacity (50 A AC, 300 A DC), and physical dimensions (0.110" Dia × 0.280" L). The only difference is packaging format (Cut Tape vs. Tape & Box), which does not affect functional performance.

Q: What is the difference between Tape & Box (TB) and Cut Tape (CT) packaging? A: Tape & Box (TB) packaging includes a protective cardboard box for storage and handling, suitable for manual assembly and standard procurement. Cut Tape (CT) packaging provides components on continuous tape without a box, optimized for automated assembly equipment and high-volume production. Both formats contain identical components.

Q: Are all substitute parts certified to the same standards? A: Yes. All four part numbers carry identical certifications: CSA, cURus, and TUV. All are ROHS3 Compliant and REACH Unaffected, ensuring equivalent regulatory compliance.

Q: If my application currently uses 0251007.NAT1L, can I switch to a different part number mid-production? A: Yes, provided your assembly process can accommodate the packaging format. If your production line uses automated pick-and-place equipment, Cut Tape (CT) variants (0251007.HAT1L or 0251007.MAT1L) may be more suitable. If manual assembly is used, Tape & Box (TB) variants (0251007.NAT1L or 0251007.PAT1L) are appropriate. Electrical and mechanical performance remain identical across all variants.

Q: What is the melting I²t value, and why is it important for substitution? A: The melting I²t value of 10.4 defines the thermal energy required to melt the fuse element. All substitute parts share this identical value, ensuring equivalent response time and protection characteristics in overcurrent conditions. This parameter must match exactly for functional substitution.

Q: Do these fuses require any special handling or storage conditions? A: Operating temperature range is -55°C to 125°C for all variants. Moisture Sensitivity Level (MSL) is Not Applicable, indicating standard storage conditions are acceptable. No special environmental controls are required.