Littelfuse 0251.200M Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0251.200M is a 200 mA, 125 V AC/DC board mount axial fuse from the PICO® II 251 series. This component is classified as obsolete, indicating it has been discontinued by the manufacturer. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production or repair requirements for systems utilizing this fuse specification.

Substiute Parts

0251.200M

Littelfuse Inc.In Stock: 8220251.200M Datasheet

Current PartRFQ

0251.200MXL

Littelfuse Inc.In Stock: 42870251.200MXL Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Littelfuse 0251.200M is determined by strict equivalence across the following critical parameters:

• Current Rating: 200 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)
• Physical Dimensions: 0.110" Dia x 0.280" L (exact match required)
• Breaking Capacity: 50A AC, 300A DC (exact match required)
• Approval Certifications: CSA, cURus (exact match required)

The substitute part 0251.200MXL meets all these criteria and belongs to the same PICO® II 251 series, ensuring functional and mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

The Littelfuse 0251.200MXL is the direct substitute for the obsolete 0251.200M. Both parts are electrically and mechanically identical across all functional parameters. The primary distinction is product status: the 0251.200M is obsolete, while the 0251.200MXL is active and currently manufactured.

The 0251.200MXL offers an additional compliance advantage: it is ROHS3 compliant, whereas the original 0251.200M is RoHS non-compliant. This makes the substitute part suitable for applications subject to RoHS regulations. Both parts maintain identical electrical performance, breaking capacity, and thermal operating range.

For new designs or ongoing production requiring this fuse specification, the 0251.200MXL should be selected to ensure long-term supply availability and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can the 0251.200MXL be used as a direct replacement for the 0251.200M?

A: Yes. Both parts are electrically and mechanically identical. They share the same current rating (200 mA), voltage ratings (125 V AC/DC), response time (Fast Blow), mounting type (Through Hole), physical dimensions (0.110" Dia x 0.280" L), breaking capacity (50A AC, 300A DC), and approval certifications (CSA, cURus).

Q: What is the difference between these two part numbers?

A: The primary difference is product status. The 0251.200M is obsolete and no longer manufactured. The 0251.200MXL is the active equivalent and is currently in production. Additionally, the 0251.200MXL is ROHS3 compliant, while the 0251.200M is RoHS non-compliant.

Q: Are there any packaging differences between these parts?

A: The 0251.200M was available in standard packaging, while the 0251.200MXL is supplied in bulk packaging. Both maintain identical component specifications and performance characteristics.

Q: Will the 0251.200MXL fit in existing PCB designs using the 0251.200M?

A: Yes. The physical dimensions and mounting type are identical (0.110" Dia x 0.280" L, Through Hole Axial), ensuring direct PCB compatibility without design modifications.

Q: Is the 0251.200MXL suitable for applications requiring RoHS compliance?

A: Yes. The 0251.200MXL is ROHS3 compliant, making it suitable for applications subject to RoHS regulations. The original 0251.200M is RoHS non-compliant.