Littelfuse 0251.375NRT2 PICO® II 251 Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0251.375NRT2 is a 375 mA, 125 V AC/DC board mount axial fuse from the PICO® II 251 series, designed for through-hole applications with fast-blow response characteristics. This part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support, maintenance, and production continuity. The electrical and mechanical specifications remain consistent across the active substitute options, enabling direct functional replacement in circuit designs.

Substiute Parts

0251.375NRT2

Littelfuse Inc.In Stock: 9290251.375NRT2 Datasheet

Current PartRFQ

0251.375MXL

Littelfuse Inc.In Stock: 18530251.375MXL Datasheet

MFR RecommendedRFQ

0251.375HAT1L

Littelfuse Inc.In Stock: 11140251.375HAT1L Datasheet

Parametric EquivalentRFQ

0251.375MAT1L

LittelfuseIn Stock: 12900251.375MAT1L Datasheet

Parametric EquivalentRFQ

0251.375MRT1L

Littelfuse Inc.In Stock: 43960251.375MRT1L Datasheet

Parametric EquivalentRFQ

0251.375NRT1L

Littelfuse Inc.In Stock: 370780251.375NRT1L Datasheet

Parametric EquivalentRFQ

0251.375PF001L

Littelfuse Inc.In Stock: 7250251.375PF001L Datasheet

Parametric EquivalentRFQ

0251.375PF008L

Littelfuse Inc.In Stock: 8440251.375PF008L Datasheet

Parametric EquivalentRFQ

7010.7040.13

SCHURTER Inc.In Stock: 12847010.7040.13 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the obsolete 0251.375NRT2 is determined by strict equivalence across the following critical parameters: current rating (375 mA), voltage ratings (125 V AC and 125 V DC), response time (fast blow), mounting type (through hole), package type (axial), breaking capacity, melting I²t value, operating temperature range, physical dimensions, and approval certifications (CSA, cURus).

All Littelfuse PICO® II 251 series substitutes listed maintain identical electrical and mechanical specifications. Differences exist only in packaging format (tape & reel, cut tape, or bulk) and product status (active vs. obsolete). The SCHURTER 7010.7040.13 provides direct functional equivalence with minor dimensional and thermal rating variations, maintaining the same current, voltage, and response characteristics.

Parameter Comparison

Engineering Selection Recommendations

For replacement of the obsolete 0251.375NRT2, selection among Littelfuse PICO® II 251 series substitutes should be based on packaging requirements and supply chain availability:

0251.375MXL (Bulk packaging) is the manufacturer-recommended substitute, offering the highest inventory availability and direct functional equivalence with active product status and ROHS3 compliance.

0251.375NRT1L (Tape & Reel) provides the largest inventory stock (37,044 pcs) and is suitable for high-volume production environments requiring automated assembly. This part maintains identical electrical specifications and certifications.

0251.375MRT1L (Cut Tape) offers the second-highest inventory (4,366 pcs) and is appropriate for medium-volume applications or mixed component sourcing scenarios.

0251.375HAT1L and 0251.375MAT1L (Cut Tape) provide alternative cut tape options with active status and full compliance certifications.

0251.375PF001L and 0251.375PF008L (Tape & Reel) are available in smaller quantities and serve as secondary sourcing options.

7010.7040.13 (SCHURTER Inc., Bulk) is a direct functional equivalent from an alternative manufacturer. This part maintains the same current, voltage, and response characteristics with CSA and UR certifications. However, it exhibits a lower maximum operating temperature (85°C vs. 125°C), a reduced melting I²t value (0.019 vs. 0.0296), and slightly different physical dimensions (0.093" Dia x 0.315" L). This substitute is suitable only for applications where the lower thermal rating and reduced I²t do not conflict with circuit protection requirements.

All Littelfuse substitutes are ROHS3 compliant and REACH unaffected, addressing environmental and regulatory requirements that the obsolete original part does not meet.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitutes interchangeably with the 0251.375NRT2?

A: All Littelfuse PICO® II 251 series substitutes (0251.375MXL, 0251.375NRT1L, 0251.375HAT1L, 0251.375MRT1L, 0251.375MAT1L, 0251.375PF001L, 0251.375PF008L) are electrically and mechanically equivalent to the obsolete 0251.375NRT2. Differences exist only in packaging format. The SCHURTER 7010.7040.13 is functionally equivalent but has lower maximum operating temperature and reduced melting I²t specifications.

Q: What is the difference between the packaging options?

A: Tape & Reel (TR) packaging is optimized for high-volume automated assembly. Cut Tape (CT) packaging is suitable for medium-volume applications. Bulk packaging is used for manual assembly or lower-volume requirements. All packaging formats contain identical fuse elements with the same electrical performance.

Q: Why does the SCHURTER part have different specifications?

A: The SCHURTER 7010.7040.13 is manufactured by a different supplier and exhibits design variations reflected in its lower maximum operating temperature (-55°C ~ 85°C vs. -55°C ~ 125°C), reduced melting I²t (0.019 vs. 0.0296), and slightly different physical dimensions. These differences may affect suitability depending on circuit thermal requirements and protection curve specifications.

Q: Are all substitutes RoHS compliant?

A: All active substitutes listed are ROHS3 compliant. The obsolete 0251.375NRT2 is RoHS non-compliant. If RoHS compliance is a design requirement, any of the active Littelfuse or SCHURTER substitutes satisfy this requirement.

Q: Which substitute should I choose for new designs?

A: For new designs, select based on production volume and assembly method. Use 0251.375NRT1L for high-volume automated assembly (largest inventory: 37,044 pcs). Use 0251.375MXL for general-purpose applications (manufacturer-recommended, 1,776 pcs available). Use cut tape options for medium-volume or mixed sourcing scenarios.

Q: Can the SCHURTER 7010.7040.13 be used in all applications where the Littelfuse part is specified?

A: The SCHURTER part is functionally equivalent for current, voltage, and response time. However, applications requiring operation above 85°C or dependent on the specific melting I²t value of 0.0296 should use Littelfuse substitutes. Verify thermal and protection curve requirements before substitution.