MF-NSML450/6-2 Equivalent & Substitute Parts

Part Overview

The MF-NSML450/6-2 is a polymeric PTC resettable fuse manufactured by Bourns Inc., rated for 6V maximum voltage with a 4.5A hold current. This component is designed for surface mount applications in the 1206 (3216 Metric) package format with a concave profile. The part is currently in active production status with full RoHS3 compliance and cURus/TUV approval certifications. Substitute parts are identified when equivalent electrical ratings and mechanical compatibility are maintained across the specified parameter set.

Substiute Parts

MF-NSML450/6-2

Bourns Inc.In Stock: 4258MF-NSML450/6-2 Datasheet

Current PartRFQ

PTSLR12066V450

Eaton - Electronics DivisionIn Stock: 3231PTSLR12066V450 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MF-NSML450/6-2 is determined by strict equivalence across the following critical parameters:

• Voltage rating: 6V maximum
• Hold current (Ih): 4.5A maximum
• Trip current (It): 9A
• Maximum current capacity: 50A
• Time to trip: 2 seconds
• Package format: 1206 (3216 Metric) with concave profile
• Surface mount configuration
• Operating temperature range: -40°C to 85°C
• Regulatory compliance: cURus and TUV approval

The identified substitute part PTSLR12066V450 meets all these criteria and maintains functional and mechanical compatibility with the original specification.

Parameter Comparison

Engineering Selection Recommendations

Both the MF-NSML450/6-2 and PTSLR12066V450 are active production components with identical electrical performance specifications and regulatory certifications. Selection between these parts may be based on:

• Inventory availability and lead time requirements
• Supplier preference and procurement agreements
• Minor dimensional variations in width (0.063" vs 0.065") and thickness (0.039" vs 0.047"), which must be evaluated against specific PCB layout constraints
• Initial resistance characteristics (2 mOhms vs 1 mOhms), which may affect circuit performance in applications sensitive to parasitic resistance

Both parts maintain full compliance with cURus and TUV approval standards and RoHS3 requirements, ensuring regulatory equivalence for end-use applications.

Frequently Asked Questions (FAQ)

Q: Can PTSLR12066V450 be used as a direct replacement for MF-NSML450/6-2?

A: Yes, provided that the dimensional variations are compatible with your PCB design. The PTSLR12066V450 is 0.002" wider and 0.008" thicker than the original part. Verify that your circuit board layout accommodates these differences.

Q: Are the electrical characteristics identical between these two parts?

A: The critical electrical parameters—voltage rating, hold current, trip current, and time to trip—are identical. The initial resistance differs by 1 mOhm (2 mOhms vs 1 mOhm), which may be significant in low-impedance circuit applications.

Q: Do both parts have the same regulatory approvals?

A: Yes. Both the MF-NSML450/6-2 and PTSLR12066V450 carry cURus and TUV certifications and are RoHS3 compliant with identical moisture sensitivity levels.

Q: What is the significance of the 1206 (3216 Metric) package format?

A: This designation indicates a surface mount component measuring 3.2mm x 1.6mm (nominal), with the concave profile specifying the physical shape of the fuse element. Both substitute parts use this identical package format.

Q: Can I mix these parts in the same production batch?

A: Mixing is permissible from an electrical standpoint, but dimensional differences should be considered if your assembly process uses vision systems or has tight mechanical tolerances. Consult your manufacturing specifications.