MF-NSML400-2 PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The MF-NSML400-2 is a polymeric PTC resettable fuse manufactured by Bourns Inc., designed for overcurrent protection in surface mount applications. This component operates at 6V with a 4A hold current and provides automatic reset functionality after fault conditions are cleared. The part is currently listed as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity.

Substiute Parts

MF-NSML400-2

Bourns Inc.In Stock: 54278MF-NSML400-2 Datasheet

Current PartRFQ

MF-NSML400/6-2

Bourns Inc.In Stock: 6527MF-NSML400/6-2 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MF-NSML400-2 is determined by strict equivalence across the following critical parameters:

• Voltage rating: 6V maximum
• Current hold specification: 4A maximum
• Current trip specification: 8A
• Package form factor: 1206 (3216 Metric), Concave surface mount
• Polymeric PTC type classification
• Operating temperature range: -40°C to 85°C
• Regulatory compliance: cURus and TUV approval

The MF-NSML400/6-2 meets all these criteria and is classified as a direct substitute. Both components share identical electrical performance specifications for voltage, hold current, and trip current, with compatible physical dimensions and mounting characteristics.

Parameter Comparison

Engineering Selection Recommendations

The MF-NSML400/6-2 is the direct substitute for the obsolete MF-NSML400-2. Both components are manufactured by Bourns Inc. and maintain identical electrical and mechanical specifications across all critical parameters. The substitute part carries active product status, ensuring continued availability and supply chain support.

Both components hold equivalent regulatory certifications (cURus and TUV approval) and maintain ROHS3 compliance. The substitute part is available in Tape & Reel packaging, suitable for automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can MF-NSML400/6-2 be used as a direct replacement for MF-NSML400-2?

A: Yes. Both components share identical voltage ratings (6V), current hold specifications (4A), current trip specifications (8A), package form factor (1206 Concave), and operating temperature range (-40°C to 85°C). The substitute is electrically and mechanically equivalent.

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

A: The primary difference is product status. MF-NSML400-2 is obsolete, while MF-NSML400/6-2 is active. Minor variations exist in initial resistance specifications (1.5 mOhms vs. 2 mOhms minimum) and post-trip resistance (14 mOhms vs. 18 mOhms maximum), which remain within acceptable tolerance ranges for PTC resettable fuse applications.

Q: Are the physical dimensions identical?

A: Both components use the 1206 (3216 Metric) Concave package with identical length and width (0.128" L x 0.063" W / 3.25mm x 1.60mm). Thickness differs slightly (0.024" vs. 0.055" maximum), but both are compatible with standard 1206 footprints.

Q: What certifications apply to the substitute part?

A: The MF-NSML400/6-2 holds cURus and TUV approval, matching the certifications of the original part. Both components are ROHS3 compliant and REACH unaffected.

Q: Is the substitute part available in the same packaging?

A: The substitute is supplied in Tape & Reel (TR) packaging, suitable for high-volume automated assembly. The original part packaging specification was not provided in the technical data.