Littelfuse 0251005.NRT2 Equivalent & Substitute Parts

Part Overview

The Littelfuse 0251005.NRT2 is a 5 A, 125 V AC/DC board mount axial fuse from the PICO® II 251 series, designed for through-hole applications. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The part features fast-blow response characteristics with a 50 A AC and 300 A DC breaking capacity, suitable for general circuit protection in industrial and consumer electronics applications.

Substiute Parts

0251005.NRT2

Littelfuse Inc.In Stock: 10410251005.NRT2 Datasheet

Current PartRFQ

0251005.MXL

Littelfuse Inc.In Stock: 90500251005.MXL Datasheet

MFR RecommendedRFQ

0251005.HAT1L

Littelfuse Inc.In Stock: 34200251005.HAT1L Datasheet

Parametric EquivalentRFQ

0251005.MAT1L

Littelfuse Inc.In Stock: 19960251005.MAT1L Datasheet

Parametric EquivalentRFQ

0251005.MRT1L

Littelfuse Inc.In Stock: 53150251005.MRT1L Datasheet

Parametric EquivalentRFQ

0251005.NAT1L

Littelfuse Inc.In Stock: 15710251005.NAT1L Datasheet

Parametric EquivalentRFQ

0251005.NRT1L

Littelfuse Inc.In Stock: 1850960251005.NRT1L Datasheet

Parametric EquivalentRFQ

0251005.PARL

Littelfuse Inc.In Stock: 11250251005.PARL Datasheet

Parametric EquivalentRFQ

7010.7130.13

SCHURTER Inc.In Stock: 11057010.7130.13 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 0251005.NRT2 is determined by strict equivalence across the following critical parameters:

• Current Rating: 5 A
• Voltage Rating: 125 V AC / 125 V DC
• Response Time: Fast Blow
• Mounting Type: Through Hole
• Fuse Type: Board Mount (Cartridge Style Excluded)
• Package / Case: Axial
• Breaking Capacity @ Rated Voltage: 50 A AC, 300 A DC
• Melting I²t: 4.14
• Operating Temperature Range: -55°C ~ 125°C
• Size / Dimension: 0.110" Dia x 0.280" L (2.80mm x 7.11mm)
• DC Cold Resistance: 0.0158 Ohms

All Littelfuse PICO® II 251 series substitutes (0251005.MXL, 0251005.HAT1L, 0251005.MAT1L, 0251005.MRT1L, 0251005.NAT1L, 0251005.NRT1L, 0251005.PARL) meet these electrical and mechanical parameters identically. The primary differences are packaging format and product status. The SCHURTER 7010.7130.13 is classified as a direct manufacturer alternative but exhibits variations in breaking capacity (300 A vs. 50 A AC), melting I²t (6.2 vs. 4.14), operating temperature maximum (85°C vs. 125°C), and physical dimensions (0.093" Dia x 0.315" L vs. 0.110" Dia x 0.280" L).

Parameter Comparison

Engineering Selection Recommendations

For direct electrical and mechanical equivalence, select from the active Littelfuse PICO® II 251 series parts: 0251005.MXL, 0251005.HAT1L, 0251005.MAT1L, 0251005.MRT1L, 0251005.NAT1L, 0251005.NRT1L, or 0251005.PARL. All maintain identical electrical characteristics, thermal performance, and physical dimensions to the obsolete 0251005.NRT2. These parts carry ROHS3 compliance and REACH unaffected status, meeting modern regulatory requirements.

Selection among Littelfuse equivalents depends on procurement packaging requirements:

• Bulk packaging: 0251005.MXL (9015 pcs available)
• Cut Tape (CT): 0251005.NRT1L (185000 pcs available), 0251005.HAT1L (3370 pcs), 0251005.MAT1L (1930 pcs), 0251005.MRT1L (5271 pcs), 0251005.NAT1L (1516 pcs)
• Tape & Reel (TR): 0251005.PARL (1022 pcs available)

The SCHURTER 7010.7130.13 is not recommended as a direct substitute due to dimensional differences (0.093" Dia x 0.315" L vs. 0.110" Dia x 0.280" L), reduced maximum operating temperature (85°C vs. 125°C), and different melting I²t characteristic (6.2 vs. 4.14). These variations may affect circuit board layout compatibility and thermal performance in applications requiring the full -55°C to 125°C operating range.

Frequently Asked Questions (FAQ)

Q: Can 0251005.NRT1L be used as a direct replacement for 0251005.NRT2?

A: Yes. Both parts are electrically and mechanically identical across all critical parameters: 5 A current rating, 125 V AC/DC voltage rating, fast-blow response, 50 A AC / 300 A DC breaking capacity, 4.14 melting I²t, and 0.110" Dia x 0.280" L dimensions. The primary difference is product status (NRT1L is active; NRT2 is obsolete) and packaging format (NRT1L is Cut Tape).

Q: What is the difference between the various Littelfuse PICO® II 251 packaging options?

A: All Littelfuse PICO® II 251 series parts with suffix designations (MXL, HAT1L, MAT1L, MRT1L, NAT1L, NRT1L, PARL) are electrically and mechanically identical. Differences are limited to packaging format: Bulk (MXL), Cut Tape (HAT1L, MAT1L, MRT1L, NAT1L, NRT1L), or Tape & Reel (PARL). Selection depends on assembly process requirements and order quantities.

Q: Why is the SCHURTER 7010.7130.13 not recommended as a substitute?

A: The SCHURTER part exhibits three significant deviations: physical dimensions (0.093" Dia x 0.315" L vs. 0.110" Dia x 0.280" L), maximum operating temperature (85°C vs. 125°C), and melting I²t value (6.2 vs. 4.14). These differences may cause board layout incompatibility and altered thermal response in circuits designed for the original specification.

Q: Are all Littelfuse PICO® II 251 substitutes RoHS compliant?

A: Yes. All active Littelfuse PICO® II 251 series parts (0251005.MXL, 0251005.HAT1L, 0251005.MAT1L, 0251005.MRT1L, 0251005.NAT1L, 0251005.NRT1L, 0251005.PARL) are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements. The original 0251005.NRT2 is RoHS non-compliant.

Q: Which substitute part has the highest inventory availability?

A: 0251005.NRT1L has the highest inventory with 185,000 pcs available, followed by 0251005.MXL with 9,015 pcs. Both are electrically and mechanically equivalent to the obsolete 0251005.NRT2.