Request Quote
(Ships tomorrow)
Littelfuse 025104.6NRT1 Equivalent & Substitute Parts
Part Overview
The Littelfuse 025104.6NRT1 is a 4.6 A, 125 V AC/DC board mount axial fuse from the PICO® II 251 series. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The fuse is designed for through-hole mounting applications requiring fast-blow response characteristics with a breaking capacity of 50 A AC and 300 A DC at rated voltage.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Current Rating | 4.6 A |
| Voltage Rating (AC) | 125 V |
| Voltage Rating (DC) | 125 V |
| Response Time | Fast Blow |
| Mounting Type | Through Hole |
| Package / Case | Axial |
| Breaking Capacity @ Rated Voltage | 50 A AC, 300 A DC |
| Melting I²t | 1.58 |
| Operating Temperature Range | -55°C ~ 125°C |
| DC Cold Resistance | 0.024 Ohms |
| Size / Dimension | 0.110" Dia x 0.280" L (2.80mm x 7.11mm) |
| Approval Agencies | CSA, cURus, PSE, TUV |
Substitute Part Grouping Explanation
Substitution eligibility is determined by strict equivalence across the following critical parameters:
- Current Rating: 4.6 A
- Voltage Rating: 125 V AC and 125 V DC
- Response Time: Fast Blow
- Mounting Type: Through Hole
- Package / Case: Axial
- Breaking Capacity @ Rated Voltage: 50 A AC, 300 A DC minimum
- Melting I²t: 1.58
- Approval Agencies: CSA, cURus, PSE, TUV
- Operating Temperature Range: -55°C ~ 125°C
- DC Cold Resistance: 0.024 Ohms
- Size / Dimension: 0.110" Dia x 0.280" L (2.80mm x 7.11mm)
All Littelfuse PICO® II 251 series parts listed below meet these electrical and mechanical specifications. The primary differences are product status (active vs. obsolete) and packaging format (Cut Tape, Tape & Reel, or Bulk).
Parameter Comparison
| Part Number | Manufacturer | Current Rating | Voltage (AC/DC) | Response Time | Breaking Capacity | Melting I²t | Operating Temp | DC Cold Resistance | Size | Packaging | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 025104.6NRT1 | Littelfuse | 4.6 A | 125 V / 125 V | Fast Blow | 50 A AC, 300 A DC | 1.58 | -55°C ~ 125°C | 0.024 Ohms | 0.110" Dia x 0.280" L | Bulk | Obsolete | Non-compliant |
| 025104.6HAT1L | Littelfuse Inc. | 4.6 A | 125 V / 125 V | Fast Blow | 50 A AC, 300 A DC | 1.58 | -55°C ~ 125°C | 0.024 Ohms | 0.110" Dia x 0.280" L | Cut Tape (CT) | Active | ROHS3 Compliant |
| 025104.6MAT1L | Littelfuse Inc. | 4.6 A | 125 V / 125 V | Fast Blow | 50 A AC, 300 A DC | 1.58 | -55°C ~ 125°C | 0.024 Ohms | 0.110" Dia x 0.280" L | Cut Tape (CT) | Active | ROHS3 Compliant |
| 025104.6MRT1L | Littelfuse Inc. | 4.6 A | 125 V / 125 V | Fast Blow | 50 A AC, 300 A DC | 1.58 | -55°C ~ 125°C | 0.024 Ohms | 0.110" Dia x 0.280" L | Cut Tape (CT) | Active | ROHS3 Compliant |
| 025104.6NRT1L | Littelfuse Inc. | 4.6 A | 125 V / 125 V | Fast Blow | 50 A AC, 300 A DC | 1.58 | -55°C ~ 125°C | 0.024 Ohms | 0.110" Dia x 0.280" L | Cut Tape (CT) | Active | ROHS3 Compliant |
| 025104.6PARL | Littelfuse Inc. | 4.6 A | 125 V / 125 V | Fast Blow | 50 A AC, 300 A DC | 1.58 | -55°C ~ 125°C | 0.024 Ohms | 0.110" Dia x 0.280" L | Tape & Reel (TR) | Active | ROHS3 Compliant |
| 025104.6PF001L | Littelfuse | 4.6 A | 125 V / 125 V | Fast Blow | 50 A AC, 300 A DC | 1.58 | -55°C ~ 125°C | 0.024 Ohms | 0.110" Dia x 0.280" L | Tape & Reel (TR) | Active | ROHS3 Compliant |
| 025104.6PF003L | Littelfuse Inc. | 4.6 A | 125 V / 125 V | Fast Blow | 50 A AC, 300 A DC | 1.58 | -55°C ~ 125°C | 0.024 Ohms | 0.110" Dia x 0.280" L | Tape & Reel (TR) | Active | ROHS3 Compliant |
| 7010.7180.13 | SCHURTER Inc. | 4.6 A | 125 V / 125 V | Fast Blow | 300 A DC | 2.6 | -55°C ~ 85°C | 0.024 Ohms | 0.093" Dia x 0.315" L | Bulk | Active | ROHS3 Compliant |
Engineering Selection Recommendations
All Littelfuse PICO® II 251 series substitutes (025104.6HAT1L, 025104.6MAT1L, 025104.6MRT1L, 025104.6NRT1L, 025104.6PARL, 025104.6PF001L, 025104.6PF003L) are electrically and mechanically equivalent to the obsolete 025104.6NRT1. These parts maintain active product status and are ROHS3 compliant, providing long-term availability and regulatory compliance advantages over the original obsolete part.
Selection among Littelfuse equivalents depends on packaging requirements: Cut Tape (CT) formats are suitable for automated assembly processes, while Tape & Reel (TR) formats support high-volume production. All maintain identical electrical performance and thermal characteristics.
The SCHURTER 7010.7180.13 is a direct manufacturer alternative meeting the same current, voltage, and response time specifications. However, it differs in melting I²t (2.6 vs. 1.58), maximum operating temperature (85°C vs. 125°C), and physical dimensions (0.093" Dia x 0.315" L vs. 0.110" Dia x 0.280" L). These differences may affect circuit protection timing and thermal performance in applications requiring the full -55°C to 125°C operating range or specific I²t characteristics.
Frequently Asked Questions (FAQ)
Q: Can I directly replace 025104.6NRT1 with any of the Littelfuse PICO® II 251 equivalents?
A: Yes. All Littelfuse PICO® II 251 series parts listed (025104.6HAT1L, 025104.6MAT1L, 025104.6MRT1L, 025104.6NRT1L, 025104.6PARL, 025104.6PF001L, 025104.6PF003L) are electrically and mechanically equivalent. They share identical current ratings, voltage ratings, response time, breaking capacity, melting I²t, operating temperature range, and physical dimensions.
Q: What is the difference between Cut Tape and Tape & Reel packaging?
A: Cut Tape (CT) packaging is suitable for lower-volume or manual assembly applications. Tape & Reel (TR) packaging is designed for automated pick-and-place assembly systems and high-volume production. Both formats contain the same electrical component.
Q: Why is the original 025104.6NRT1 marked as obsolete?
A: Obsolete status indicates the part is no longer manufactured or supported by Littelfuse. Active equivalent parts ensure continued availability, regulatory compliance, and manufacturing support for new designs and production runs.
Q: Can I use the SCHURTER 7010.7180.13 as a substitute?
A: The SCHURTER 7010.7180.13 meets the core electrical specifications (4.6 A, 125 V AC/DC, fast-blow response). However, it has a higher melting I²t (2.6 vs. 1.58), lower maximum operating temperature (85°C vs. 125°C), and different physical dimensions. Use this part only if your application does not require the full -55°C to 125°C temperature range and can tolerate the different thermal response characteristics.
Q: Are all substitute parts RoHS compliant?
A: All active Littelfuse PICO® II 251 equivalents are ROHS3 compliant. The original 025104.6NRT1 is RoHS non-compliant. The SCHURTER 7010.7180.13 is also ROHS3 compliant.
Q: What approval agencies certify these fuses?
A: All Littelfuse PICO® II 251 parts carry CSA, cURus, PSE, and TUV approvals. The SCHURTER 7010.7180.13 carries CSA and UR approvals.
Alternative Parts
SJ6012L2TP
Littelfuse Inc.
6 Alternative Parts
JMK107BBJ476MA-RE
Taiyo Yuden
10 Alternative Parts
GMK107BBJ475MA-T
Taiyo Yuden
5 Alternative Parts
SJ6020N2ARP
Littelfuse Inc.
3 Alternative Parts
SJ6025R2ATP
Littelfuse Inc.
4 Alternative Parts
2474-05L
API Delevan Inc.
1 Alternative Parts
4590R-684K
API Delevan Inc.
1 Alternative Parts
CM6560R-334
API Delevan Inc.
1 Alternative Parts
CM6460-104
API Delevan Inc.
1 Alternative Parts
5526-12
API Delevan Inc.
1 Alternative Parts