MF-NSML550-2 Equivalent & Substitute Parts

Part Overview

The MF-NSML550-2 is a Polymeric PTC Resettable Fuse manufactured by Bourns Inc., rated for 6V at 5.5A hold current in a 1206 (3216 Metric) surface mount package. This component is classified as Obsolete, making identification of suitable substitutes essential for ongoing design support and production continuity. The part operates across the industrial temperature range of -40°C to 85°C and carries ROHS3 compliance with cURus and TUV approvals.

Substiute Parts

MF-NSML550-2

Bourns Inc.In Stock: 851MF-NSML550-2 Datasheet

Current PartRFQ

MF-NSML550/6-2

Bourns Inc.In Stock: 4585MF-NSML550/6-2 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the MF-NSML550-2 is determined by strict equivalence across the following critical parameters:

• Voltage rating: 6V maximum
• Current hold (Ih): 5.5A maximum
• Current trip (It): 11A
• Package type: 1206 (3216 Metric), Concave surface mount
• Operating temperature range: -40°C to 85°C
• Regulatory compliance: ROHS3, cURus, and TUV certifications

The MF-NSML550/6-2 meets all these criteria and is listed as a direct substitute. Both parts share identical voltage, hold current, trip current, package geometry, and temperature specifications. Differences in secondary parameters such as time to trip, initial resistance, and post-trip resistance do not disqualify substitution when the primary electrical and mechanical specifications align.

Parameter Comparison

Engineering Selection Recommendations

The MF-NSML550/6-2 is the direct substitute for the obsolete MF-NSML550-2. Both components carry identical primary electrical specifications (6V, 5.5A hold current, 11A trip current) and are housed in the same 1206 (3216 Metric) concave surface mount package with matching footprint dimensions.

The MF-NSML550/6-2 holds Active product status, ensuring long-term availability and manufacturing support. Both parts maintain ROHS3 compliance and carry cURus and TUV certifications, meeting the same regulatory and safety requirements.

The MF-NSML550/6-2 exhibits a reduced maximum thickness of 0.039" (1.00mm) compared to 0.047" (1.20mm) for the original part, providing improved board-level clearance. This dimensional improvement does not affect electrical performance or circuit compatibility.

Frequently Asked Questions (FAQ)

Q: Can the MF-NSML550/6-2 be used as a direct replacement for the MF-NSML550-2?

A: Yes. Both parts share identical voltage ratings (6V), hold current (5.5A), trip current (11A), and package geometry (1206 concave surface mount). Electrical and mechanical compatibility is confirmed.

Q: What is the primary reason to transition from MF-NSML550-2 to MF-NSML550/6-2?

A: The MF-NSML550-2 is classified as Obsolete. The MF-NSML550/6-2 is an Active product with confirmed long-term availability from Bourns Inc.

Q: Are there differences in regulatory compliance between these parts?

A: No. Both parts are ROHS3 compliant and carry identical cURus and TUV approvals. REACH and ECCN classifications are identical.

Q: Does the thickness difference affect PCB layout or assembly?

A: The MF-NSML550/6-2 is thinner (0.039" vs. 0.047"), which provides additional board clearance. No layout modifications are required for substitution.

Q: What is the packaging difference between these parts?

A: The MF-NSML550-2 is supplied in standard packaging. The MF-NSML550/6-2 is supplied in Tape & Reel (TR) format, which is standard for high-volume production environments.

Q: Are the thermal and environmental operating ranges identical?

A: Yes. Both parts operate across -40°C to 85°C and maintain identical Moisture Sensitivity Level (MSL) ratings of 2A (4 Weeks).