Littelfuse 0251.200MAT1 Equivalent & Substitute Parts

Part Overview

The Littelfuse 0251.200MAT1 is a 200 mA, 125 V AC/DC board mount axial fuse from the PICO® II 251 series. This component is classified as obsolete, which necessitates identification of active equivalent alternatives for ongoing design support and procurement. The part features fast-blow response characteristics suitable for circuit protection applications requiring rapid fault isolation. Substitute parts maintain identical electrical and mechanical specifications while offering improved product status and compliance certifications.

Substiute Parts

0251.200MAT1

LittelfuseIn Stock: 7840251.200MAT1 Datasheet

Current PartRFQ

0251.200MAT1L

Littelfuse Inc.In Stock: 13010251.200MAT1L Datasheet

DirectRFQ

0251.200NAT1L

Littelfuse Inc.In Stock: 7410251.200NAT1L Datasheet

Parametric EquivalentRFQ

0251.200NAT6L

Littelfuse Inc.In Stock: 8120251.200NAT6L Datasheet

Parametric EquivalentRFQ

0251.200PAT1L

Littelfuse Inc.In Stock: 12280251.200PAT1L Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 0251.200MAT1 are qualified based on strict equivalence across all critical electrical and mechanical parameters. The substitution criteria are:

• 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)
• DC Cold Resistance: 0.895 Ohms (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)
• Approval Agency: CSA, cURus (exact match required)

All substitute parts listed below meet these criteria. Differences are limited to packaging format and product status (active vs. obsolete), with no impact on electrical or mechanical performance.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts (0251.200MAT1L, 0251.200NAT1L, 0251.200NAT6L, 0251.200PAT1L) are functionally equivalent to the obsolete 0251.200MAT1 across all electrical and mechanical parameters. Selection among active alternatives should be based on the following factors:

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

Compliance Certification: All substitute parts are ROHS3 Compliant and REACH Unaffected, providing improved regulatory alignment for modern applications. The original part is RoHS Non-Compliant.

Packaging Format: Selection depends on procurement and assembly requirements:

• 0251.200MAT1L: Cut Tape (CT) format, 1216 Pcs inventory
• 0251.200NAT1L: Tape & Box (TB) format, 685 Pcs inventory
• 0251.200NAT6L: Tape & Box (TB) format, 788 Pcs inventory
• 0251.200PAT1L: Tape & Box (TB) format, 1162 Pcs inventory

Packaging format does not affect electrical or mechanical performance and should be selected based on assembly line compatibility and inventory management requirements.

Frequently Asked Questions (FAQ)

Q: Are all listed substitute parts electrically identical to the 0251.200MAT1?

A: Yes. All substitute parts maintain identical current rating (200 mA), voltage ratings (125 V AC/DC), response time (Fast Blow), breaking capacity (50A AC, 300A DC), and DC cold resistance (0.895 Ohms). Electrical performance is equivalent across all alternatives.

Q: What is the difference between the substitute part numbers?

A: The substitute parts differ only in packaging format (Cut Tape vs. Tape & Box) and inventory availability. The electrical and mechanical specifications, including dimensions, operating temperature range, and approval certifications, are identical. Packaging format is a procurement consideration and does not affect circuit performance.

Q: Can I use any of these substitute parts as a direct replacement in existing designs?

A: Yes. All substitute parts are pin-compatible and dimensionally identical to the 0251.200MAT1. Through-hole mounting, axial package orientation, and physical dimensions (0.110" Dia x 0.280" L) are preserved across all alternatives. No PCB layout modifications are required.

Q: Why is the original 0251.200MAT1 classified as Obsolete?

A: The original part is marked Obsolete due to its RoHS Non-Compliant status. Active alternatives with ROHS3 Compliance are available and recommended for new designs and ongoing procurement.

Q: Do the substitute parts have the same approval certifications?

A: Yes. All substitute parts carry CSA and cURus approval certifications, matching the original part's regulatory qualifications.

Q: Which substitute part should I select for new production?

A: Selection should be based on packaging format compatibility with your assembly process. All parts are electrically and mechanically equivalent. 0251.200PAT1L offers the highest inventory availability (1162 Pcs) in Tape & Box format. 0251.200MAT1L is available in Cut Tape format if that aligns with your assembly requirements.