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Littelfuse 0251.750NRT2 Equivalent & Substitute Parts
Part Overview
The Littelfuse 0251.750NRT2 is a 750 mA, 125 V AC/DC axial board mount fuse from the PICO® II 251 series. This component is classified as obsolete, which necessitates identification of active equivalent parts for ongoing design support and procurement. The part features fast-blow response characteristics, CSA/cURus/TUV approvals, and operates across -55°C to 125°C. Equivalent active alternatives maintain identical electrical and mechanical specifications while offering improved availability and RoHS3 compliance.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Current Rating | 750 mA |
| Voltage Rating (AC) | 125 V |
| Voltage Rating (DC) | 125 V |
| Response Time | Fast Blow |
| Mounting Type | Through Hole |
| Package / Case | Axial |
| Breaking Capacity (AC) | 50 A |
| Breaking Capacity (DC) | 300 A |
| Melting I²t | 0.153 |
| DC Cold Resistance | 0.175 Ohms |
| Operating Temperature Range | -55°C to 125°C |
| Size / Dimension | 0.110" Dia x 0.280" L (2.80mm x 7.11mm) |
| Approval Agencies | CSA, cURus, TUV |
Substitute Part Grouping Explanation
Substitution of the 0251.750NRT2 is determined by strict equivalence across all electrical and mechanical parameters. All substitute parts maintain identical current rating (750 mA), voltage ratings (125 V AC/DC), response time (Fast Blow), breaking capacity (50 A AC / 300 A DC), melting I²t (0.153), DC cold resistance (0.175 Ohms), operating temperature range (-55°C to 125°C), physical dimensions (0.110" Dia x 0.280" L), and approval certifications (CSA, cURus, TUV).
Substitutes are differentiated solely by packaging format: Cut Tape (CT), Tape & Reel (TR), and Bulk. The MFR recommended substitute 0251.750MXL is available in Bulk packaging. All other active equivalents are available in either Cut Tape or Tape & Reel formats. Product status transition from Obsolete to Active is the primary driver for substitution necessity.
Parameter Comparison
| Part Number | Manufacturer | Series | Current Rating | Voltage AC/DC | Response Time | Breaking Capacity (AC/DC) | Melting I²t | DC Cold Resistance | Operating Temp | Packaging | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0251.750NRT2 | Littelfuse | PICO® II 251 | 750 mA | 125 V / 125 V | Fast Blow | 50 A / 300 A | 0.153 | 0.175 Ω | -55°C to 125°C | Axial | Obsolete | Non-compliant |
| 0251.750MXL | Littelfuse Inc. | PICO® II 251 | 750 mA | 125 V / 125 V | Fast Blow | 50 A / 300 A | 0.153 | 0.175 Ω | -55°C to 125°C | Bulk | Active | ROHS3 Compliant |
| 0251.750HAT1L | Littelfuse Inc. | PICO® II 251 | 750 mA | 125 V / 125 V | Fast Blow | 50 A / 300 A | 0.153 | 0.175 Ω | -55°C to 125°C | Cut Tape (CT) | Active | ROHS3 Compliant |
| 0251.750MAT1L | Littelfuse Inc. | PICO® II 251 | 750 mA | 125 V / 125 V | Fast Blow | 50 A / 300 A | 0.153 | 0.175 Ω | -55°C to 125°C | Cut Tape (CT) | Active | ROHS3 Compliant |
| 0251.750MRT1L | Littelfuse Inc. | PICO® II 251 | 750 mA | 125 V / 125 V | Fast Blow | 50 A / 300 A | 0.153 | 0.175 Ω | -55°C to 125°C | Cut Tape (CT) | Active | ROHS3 Compliant |
| 0251.750NAT1L | Littelfuse Inc. | PICO® II 251 | 750 mA | 125 V / 125 V | Fast Blow | 50 A / 300 A | 0.153 | 0.175 Ω | -55°C to 125°C | Cut Tape (CT) | Active | ROHS3 Compliant |
| 0251.750NRT1L | Littelfuse Inc. | PICO® II 251 | 750 mA | 125 V / 125 V | Fast Blow | 50 A / 300 A | 0.153 | 0.175 Ω | -55°C to 125°C | Cut Tape (CT) | Active | ROHS3 Compliant |
| 0251.750PARL | Littelfuse Inc. | PICO® II 251 | 750 mA | 125 V / 125 V | Fast Blow | 50 A / 300 A | 0.153 | 0.175 Ω | -55°C to 125°C | Tape & Reel (TR) | Active | ROHS3 Compliant |
| 0251.750PF001L | Littelfuse Inc. | PICO® II 251 | 750 mA | 125 V / 125 V | Fast Blow | 50 A / 300 A | 0.153 | 0.175 Ω | -55°C to 125°C | Tape & Reel (TR) | Active | ROHS3 Compliant |
| 0251.750PF003L | Littelfuse Inc. | PICO® II 251 | 750 mA | 125 V / 125 V | Fast Blow | 50 A / 300 A | 0.153 | 0.175 Ω | -55°C to 125°C | Tape & Reel (TR) | Active | ROHS3 Compliant |
| 0251.750PF008L | Littelfuse Inc. | PICO® II 251 | 750 mA | 125 V / 125 V | Fast Blow | 50 A / 300 A | 0.153 | 0.175 Ω | -55°C to 125°C | Tape & Reel (TR) | Active | ROHS3 Compliant |
Engineering Selection Recommendations
All listed substitute parts are electrically and mechanically equivalent to the 0251.750NRT2. Selection between alternatives is determined by procurement requirements and assembly methodology.
For bulk component procurement, 0251.750MXL is the manufacturer-recommended substitute, offering Active product status and ROHS3 compliance.
For automated assembly processes requiring tape formats, Cut Tape (CT) options include 0251.750HAT1L, 0251.750MAT1L, 0251.750MRT1L, 0251.750NAT1L, and 0251.750NRT1L. The 0251.750NRT1L variant maintains the highest inventory availability (191,475 units) among Cut Tape options.
For high-volume production requiring Tape & Reel (TR) packaging, options include 0251.750PARL, 0251.750PF001L, 0251.750PF003L, and 0251.750PF008L.
All active substitutes carry CSA, cURus, and TUV approvals identical to the original part and comply with ROHS3 requirements, addressing regulatory compliance gaps present in the obsolete 0251.750NRT2.
Frequently Asked Questions (FAQ)
Q: Can 0251.750NRT2 be directly replaced with any of the listed substitutes?
A: Yes. All listed substitutes maintain identical electrical specifications (750 mA, 125 V AC/DC, Fast Blow response), mechanical dimensions (0.110" Dia x 0.280" L), and thermal characteristics (-55°C to 125°C operating range). Direct functional replacement is supported across all alternatives.
Q: What is the difference between Cut Tape and Tape & Reel packaging?
A: Cut Tape (CT) packaging provides individual component strips suitable for manual assembly or semi-automated processes. Tape & Reel (TR) packaging supplies components on continuous reels optimized for high-speed automated pick-and-place assembly equipment. Bulk packaging provides loose components for manual sorting and assembly.
Q: Why is the original 0251.750NRT2 marked as obsolete?
A: The 0251.750NRT2 is classified as obsolete due to product lifecycle management. Active equivalents from the same PICO® II 251 series provide continued design support with improved regulatory compliance (ROHS3) and maintained availability.
Q: Are all substitutes RoHS compliant?
A: All active substitute parts listed are ROHS3 compliant. The original 0251.750NRT2 is marked as RoHS non-compliant. Substitution to any active equivalent addresses RoHS compliance requirements.
Q: Which substitute offers the best inventory availability?
A: 0251.750NRT1L (Cut Tape format) provides the highest inventory level at 191,475 units. For Bulk packaging, 0251.750MXL offers 778 units. For Tape & Reel format, 0251.750PARL provides 1,086 units.
Q: Do all substitutes carry the same certifications as the original part?
A: Yes. All substitute parts maintain CSA, cURus, and TUV approvals identical to the 0251.750NRT2, ensuring regulatory compliance across all equivalent options.
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