Littelfuse 0251.750M Equivalent & Substitute Parts

Part Overview

The Littelfuse 0251.750M is a 750 mA, 125 V AC/DC board mount axial fuse from the PICO® II 251 series. This component is classified as obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements. Substitute parts maintain identical electrical and mechanical specifications while offering current product availability and updated compliance status.

Substiute Parts

0251.750M

Littelfuse Inc.In Stock: 11780251.750M Datasheet

Current PartRFQ

0251.750MXL

Littelfuse Inc.In Stock: 7910251.750MXL Datasheet

Parametric EquivalentRFQ

0251.750VXL

Littelfuse Inc.In Stock: 11850251.750VXL Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 0251.750M are identified based on strict parametric equivalence within the PICO® II 251 series. The following electrical and mechanical parameters determine substitution eligibility:

• Current Rating: 750 mA (exact match required)
• Voltage Rating: 125 V AC and 125 V DC (exact match required)
• Response Time: Fast Blow (exact match required)
• Mounting Type: Through Hole (exact match required)
• Package / Case: Axial (exact match required)
• Breaking Capacity: 50A AC, 300A DC (exact match required)
• Melting I²t: 0.153 (exact match required)
• Physical Dimensions: 0.110" Dia x 0.280" L (exact match required)
• DC Cold Resistance: 0.175 Ohms (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)
• Approval Agencies: CSA, cURus, TUV (exact match required)

Both substitute parts meet all parametric requirements and are manufactured by Littelfuse Inc. within the same product series.

Parameter Comparison

Engineering Selection Recommendations

Both 0251.750MXL and 0251.750VXL are direct parametric equivalents to the obsolete 0251.750M. Selection between these two active alternatives should be based on the following factors:

RoHS Compliance: Both substitute parts are ROHS3 compliant, whereas the main part is RoHS non-compliant. For applications subject to RoHS directives, either substitute part is suitable.

Product Status: Both substitute parts carry Active product status, ensuring long-term availability and continued manufacturer support compared to the Obsolete status of the original part.

Packaging: The 0251.750MXL is supplied in Bulk packaging, while the 0251.750VXL is also supplied in Bulk packaging. Packaging selection should align with procurement and inventory management requirements.

Electrical and Mechanical Compatibility: Both parts are electrically and mechanically interchangeable with the 0251.750M across all specified parameters, including current rating, voltage ratings, response time, breaking capacity, thermal characteristics, and physical dimensions.

Frequently Asked Questions (FAQ)

Q: Can the 0251.750MXL and 0251.750VXL be used interchangeably with the 0251.750M?

A: Yes. Both substitute parts are parametric equivalents meeting all electrical and mechanical specifications of the original part, including current rating (750 mA), voltage ratings (125 V AC/DC), response time (Fast Blow), breaking capacity (50A AC, 300A DC), and physical dimensions (0.110" Dia x 0.280" L).

Q: What is the primary reason for substitution?

A: The 0251.750M is classified as Obsolete. The substitute parts 0251.750MXL and 0251.750VXL are Active products from the same PICO® II 251 series, ensuring continued availability and manufacturer support.

Q: Are there compliance differences between the main part and substitutes?

A: Yes. The 0251.750M is RoHS non-compliant, while both 0251.750MXL and 0251.750VXL are ROHS3 compliant. For applications requiring RoHS compliance, the substitute parts are required.

Q: Do the substitute parts maintain the same thermal and electrical characteristics?

A: Yes. Both substitute parts maintain identical DC cold resistance (0.175 Ohms), melting I²t (0.153), operating temperature range (-55°C ~ 125°C), and all approval certifications (CSA, cURus, TUV).

Q: Are there any packaging or inventory considerations?

A: Both substitute parts are supplied in Bulk packaging. Inventory availability should be confirmed with the supplier, as stock levels may vary between part numbers.

Q: Can these parts be used in new designs?

A: Yes. Both substitute parts are Active products suitable for new designs. The use of Active parts is recommended over the Obsolete original part to ensure long-term supply chain stability.