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Littelfuse 0251005.MAT1 PICO® II 251 Board Mount Axial Fuse - Equivalent & Substitute Parts
Part Overview
The Littelfuse 0251005.MAT1 is a 5A 125VAC/125VDC board mount axial fuse from the PICO® II 251 series, designed for through-hole mounting applications. This part is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance requirements. Active alternatives within the same series provide identical electrical and mechanical specifications with improved availability and RoHS3 compliance.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Current Rating | 5 A |
| Voltage Rating (AC) | 125 V |
| Voltage Rating (DC) | 125 V |
| Response Time | Fast Blow |
| Mounting Type | Through Hole |
| Fuse Type | Board Mount (Cartridge Style Excluded) |
| Package / Case | Axial |
| Breaking Capacity @ Rated Voltage | 50A AC, 300A DC |
| Melting I²t | 4.14 |
| Size / Dimension | 0.110" Dia x 0.280" L (2.80mm x 7.11mm) |
| DC Cold Resistance | 0.0158 Ohms |
| Operating Temperature Range | -55°C ~ 125°C |
| Approval Agency | CCC, CSA, cURus, PSE, TUV |
Substitute Part Grouping Explanation
Substitution for the obsolete 0251005.MAT1 is based on strict electrical and mechanical parameter equivalence within the PICO® II 251 series. All substitute parts maintain identical specifications across the following critical parameters:
- Current Rating: 5 A
- Voltage Rating: 125 V AC / 125 V DC
- Response Time: Fast Blow
- Breaking Capacity: 50A AC, 300A DC
- Melting I²t: 4.14
- Physical Dimensions: 0.110" Dia x 0.280" L
- DC Cold Resistance: 0.0158 Ohms
- Operating Temperature: -55°C ~ 125°C
- Approval Agencies: CCC, CSA, cURus, PSE, TUV
Substitute parts differ only in packaging configuration (Cut Tape, Tape & Box) and product status (Active vs. Obsolete). All active alternatives are RoHS3 compliant and REACH unaffected, providing improved regulatory alignment compared to the original part.
Parameter Comparison
| Part Number | Manufacturer | Series | Current Rating | Voltage AC/DC | Response Time | Breaking Capacity | Melting I²t | Dimensions | DC Resistance | Packaging | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0251005.MAT1 | Littelfuse Inc. | PICO® II 251 | 5 A | 125V / 125V | Fast Blow | 50A AC, 300A DC | 4.14 | 0.110" x 0.280" | 0.0158 Ω | - | Obsolete | Non-compliant |
| 0251005.MAT1L | Littelfuse Inc. | PICO® II 251 | 5 A | 125V / 125V | Fast Blow | 50A AC, 300A DC | 4.14 | 0.110" x 0.280" | 0.0158 Ω | Cut Tape (CT) | Active | RoHS3 Compliant |
| 0251005.HAT1L | Littelfuse Inc. | PICO® II 251 | 5 A | 125V / 125V | Fast Blow | 50A AC, 300A DC | 4.14 | 0.110" x 0.280" | 0.0158 Ω | Cut Tape (CT) | Active | RoHS3 Compliant |
| 0251005.NAT1L | Littelfuse Inc. | PICO® II 251 | 5 A | 125V / 125V | Fast Blow | 50A AC, 300A DC | 4.14 | 0.110" x 0.280" | 0.0158 Ω | Cut Tape (CT) | Active | RoHS3 Compliant |
| 0251005.NAT6L | Littelfuse Inc. | PICO® II 251 | 5 A | 125V / 125V | Fast Blow | 50A AC, 300A DC | 4.14 | 0.110" x 0.280" | 0.0158 Ω | Tape & Box (TB) | Active | RoHS3 Compliant |
| 0251005.PAT1L | Littelfuse Inc. | PICO® II 251 | 5 A | 125V / 125V | Fast Blow | 50A AC, 300A DC | 4.14 | 0.110" x 0.280" | 0.0158 Ω | Tape & Box (TB) | Active | RoHS3 Compliant |
| 0251005.PF001L | Littelfuse Inc. | PICO® II 251 | 5 A | 125V / 125V | Fast Blow | 50A AC, 300A DC | 4.14 | 0.110" x 0.280" | 0.0158 Ω | Tape & Box (TB) | Active | RoHS3 Compliant |
| 0251005.PF002L | Littelfuse Inc. | PICO® II 251 | 5 A | 125V / 125V | Fast Blow | 50A AC, 300A DC | 4.14 | 0.110" x 0.280" | 0.0158 Ω | Tape & Box (TB) | Active | RoHS3 Compliant |
| 0251005.PF003L | Littelfuse Inc. | PICO® II 251 | 5 A | 125V / 125V | Fast Blow | 50A AC, 300A DC | 4.14 | 0.110" x 0.280" | 0.0158 Ω | Tape & Box (TB) | Active | RoHS3 Compliant |
| 0251005.PF009L | Littelfuse Inc. | PICO® II 251 | 5 A | 125V / 125V | Fast Blow | 50A AC, 300A DC | 4.14 | 0.110" x 0.280" | 0.0158 Ω | Tape & Box (TB) | Active | RoHS3 Compliant |
Engineering Selection Recommendations
All listed substitute parts are direct electrical and mechanical equivalents to the obsolete 0251005.MAT1. Selection between active alternatives is determined by packaging requirements and supply chain availability:
Cut Tape (CT) Packaging: 0251005.MAT1L, 0251005.HAT1L, and 0251005.NAT1L are suitable for automated pick-and-place assembly processes and lower-volume applications.
Tape & Box (TB) Packaging: 0251005.NAT6L, 0251005.PAT1L, 0251005.PF001L, 0251005.PF002L, 0251005.PF003L, and 0251005.PF009L are configured for higher-volume production runs and manual assembly operations.
All active substitutes maintain full compliance with CCC, CSA, cURus, PSE, and TUV approval agencies. RoHS3 compliance of all active alternatives provides regulatory advantage over the non-compliant original part. REACH unaffected status confirms no substance of concern restrictions.
Frequently Asked Questions (FAQ)
Q: Can 0251005.MAT1L be used as a direct replacement for 0251005.MAT1?
A: Yes. Both parts are electrically and mechanically identical with 5A 125VAC/125VDC ratings, fast-blow response, and identical physical dimensions. The primary difference is packaging format (Cut Tape vs. unspecified original) and product status (Active vs. Obsolete). 0251005.MAT1L also provides RoHS3 compliance.
Q: What is the difference between Cut Tape and Tape & Box packaging?
A: Cut Tape (CT) packaging supplies individual components on carrier tape suitable for automated assembly equipment. Tape & Box (TB) packaging includes the same tape format with protective boxing for storage and manual handling. Both formats contain electrically identical components with the same specifications.
Q: Are all substitute parts certified to the same approval agencies?
A: Yes. All substitute parts listed carry identical certifications: CCC, CSA, cURus, PSE, and TUV. This ensures compliance with the same regulatory standards as the original part.
Q: Does RoHS3 compliance affect electrical performance?
A: No. RoHS3 compliance addresses material composition and hazardous substance restrictions only. All electrical parameters, including current rating, voltage rating, breaking capacity, and melting I²t, remain identical across all parts.
Q: Which substitute should be selected for new production designs?
A: For new designs, any active substitute part is appropriate. Selection should be based on assembly process requirements: Cut Tape variants for automated assembly, Tape & Box variants for manual or mixed assembly processes. All provide equivalent electrical performance and regulatory compliance.
Q: Is there a difference in DC cold resistance between the original and substitute parts?
A: No. All parts, including the obsolete 0251005.MAT1 and all active substitutes, maintain 0.0158 Ohms DC cold resistance, ensuring identical electrical behavior in circuit applications.
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