Littelfuse 025102.5NRT2 Equivalent & Substitute Parts

Part Overview

The Littelfuse 025102.5NRT2 is a 2.5 A, 125 V AC/DC board mount axial fuse from the PICO® II 251 series. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement. The part features fast-blow response characteristics, through-hole mounting, and compliance with multiple international approval agencies including CCC, CSA, cURus, PSE, and TUV. Identifying active equivalent parts ensures design continuity and supply chain reliability.

Substiute Parts

025102.5NRT2

Littelfuse Inc.In Stock: 814025102.5NRT2 Datasheet

Current PartRFQ

025102.5MXL

Littelfuse Inc.In Stock: 1987025102.5MXL Datasheet

MFR RecommendedRFQ

025102.5MAT1L

Littelfuse Inc.In Stock: 2514025102.5MAT1L Datasheet

Parametric EquivalentRFQ

025102.5MRT1L

Littelfuse Inc.In Stock: 1441025102.5MRT1L Datasheet

Parametric EquivalentRFQ

025102.5NAT1L

Littelfuse Inc.In Stock: 3974025102.5NAT1L Datasheet

Parametric EquivalentRFQ

025102.5NRT1L

Littelfuse Inc.In Stock: 15918025102.5NRT1L Datasheet

Parametric EquivalentRFQ

025102.5PARL

Littelfuse Inc.In Stock: 1005025102.5PARL Datasheet

Parametric EquivalentRFQ

025102.5PF001L

Littelfuse Inc.In Stock: 1163025102.5PF001L Datasheet

Parametric EquivalentRFQ

7010.7100.13

SCHURTER Inc.In Stock: 16107010.7100.13 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 025102.5NRT2 are classified based on electrical equivalence and packaging format. All Littelfuse substitutes (025102.5MXL, 025102.5MAT1L, 025102.5MRT1L, 025102.5NAT1L, 025102.5NRT1L, 025102.5PARL, 025102.5PF001L) maintain identical electrical specifications: 2.5 A current rating, 125 V AC/DC voltage rating, fast-blow response, 0.721 melting I²t, and -55°C ~ 125°C operating temperature. These parts differ only in packaging format (Bulk, Cut Tape, or Tape & Reel) and product status (all active versus the original obsolete status).

The SCHURTER 7010.7100.13 represents a direct cross-manufacturer equivalent with matching electrical ratings and breaking capacity. However, this part features a non-standard cartridge axial package format and operates within a narrower temperature range (-55°C ~ 85°C), with a higher melting I²t value of 1.4 compared to 0.721.

Key parameters determining substitution eligibility:

• Current Rating: 2.5 A (mandatory match)
• Voltage Rating: 125 V AC and 125 V DC (mandatory match)
• Response Time: Fast Blow (mandatory match)
• Mounting Type: Through Hole (mandatory match)
• Breaking Capacity: Minimum 50A AC, 300A DC (all meet or exceed)
• Approval Agencies: CSA, cURus, TUV (common certifications across all parts)

Parameter Comparison

Engineering Selection Recommendations

All Littelfuse substitutes (025102.5MXL, 025102.5MAT1L, 025102.5MRT1L, 025102.5NAT1L, 025102.5NRT1L, 025102.5PARL, 025102.5PF001L) are electrically and mechanically equivalent to the obsolete 025102.5NRT2. These parts maintain active product status and ROHS3 compliance, providing superior supply chain availability. Selection among these Littelfuse options depends on packaging requirements: Bulk (025102.5MXL), Cut Tape (025102.5MAT1L, 025102.5MRT1L, 025102.5NAT1L, 025102.5NRT1L), or Tape & Reel (025102.5PARL, 025102.5PF001L).

The SCHURTER 7010.7100.13 is electrically compatible but operates within a reduced temperature range (-55°C ~ 85°C versus -55°C ~ 125°C) and exhibits a higher melting I²t value (1.4 versus 0.721). This part is suitable only for applications where the narrower temperature range and altered thermal response characteristics are acceptable. The non-standard cartridge axial package format may require PCB layout verification.

For new designs and ongoing production, Littelfuse substitutes are the primary recommendation due to complete electrical equivalence, active status, and standard axial package compatibility.

Frequently Asked Questions (FAQ)

Q: Can 025102.5NRT2 be directly replaced with any of the Littelfuse substitutes?

A: Yes. All Littelfuse substitutes (025102.5MXL, 025102.5MAT1L, 025102.5MRT1L, 025102.5NAT1L, 025102.5NRT1L, 025102.5PARL, 025102.5PF001L) are direct electrical and mechanical equivalents. They share identical current ratings (2.5 A), voltage ratings (125 V AC/DC), response characteristics (fast-blow), operating temperature range (-55°C ~ 125°C), and physical dimensions (0.110" Dia x 0.280" L). The only differences are packaging format and product status (all active versus obsolete).

Q: What is the difference between the Littelfuse packaging options?

A: Packaging format affects procurement and assembly processes. Bulk packaging (025102.5MXL) is suitable for manual assembly or small-volume applications. Cut Tape (025102.5MAT1L, 025102.5MRT1L, 025102.5NAT1L, 025102.5NRT1L) provides organized component strips for semi-automated handling. Tape & Reel (025102.5PARL, 025102.5PF001L) is optimized for high-speed automated pick-and-place assembly. All three formats contain electrically identical components.

Q: Is the SCHURTER 7010.7100.13 a suitable replacement?

A: The SCHURTER 7010.7100.13 is electrically compatible for applications operating within -55°C ~ 85°C. However, it features a higher melting I²t (1.4 versus 0.721) and uses a non-standard cartridge axial package. Applications requiring the full -55°C ~ 125°C temperature range or those with thermal response specifications tied to the 0.721 I²t value should use Littelfuse substitutes instead.

Q: Are all substitutes RoHS compliant?

A: The original 025102.5NRT2 is RoHS non-compliant. All active substitutes (Littelfuse and SCHURTER) are ROHS3 compliant, meeting current environmental regulations for new designs and production.

Q: Which substitute has the highest inventory availability?

A: The 025102.5NRT1L (Littelfuse, Cut Tape format) has the highest inventory at 15,900 pieces. The 025102.5NAT1L (Cut Tape) follows with 3,890 pieces. For bulk applications, 025102.5MAT1L offers 2,448 pieces in Cut Tape format.