MF-NSML350-2 PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The MF-NSML350-2 is a polymeric PTC resettable fuse manufactured by Bourns Inc., designed for 6V applications with a 4.6A hold current rating in a compact 1206 (3216 Metric) surface mount package. This component is classified as obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements. The part provides overcurrent protection with automatic reset capability after fault condition removal.

Substiute Parts

MF-NSML350-2

Bourns Inc.In Stock: 1128MF-NSML350-2 Datasheet

Current PartRFQ

MF-NSML350/6-2

Bourns Inc.In Stock: 771MF-NSML350/6-2 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MF-NSML350-2 is determined by strict equivalence across the following critical parameters:

• Voltage rating: 6V maximum
• Current hold (Ih): 4.6A maximum
• Current trip (It): 7A
• Package type: 1206 (3216 Metric), Concave surface mount
• Polymeric PTC type classification
• Regulatory approvals: cURus and TUV certification
• RoHS3 compliance status

The MF-NSML350/6-2 qualifies as a direct substitute based on matching all critical electrical and mechanical parameters. This part maintains identical voltage, hold current, trip current, and package specifications while offering active product status and improved availability.

Parameter Comparison

Engineering Selection Recommendations

The MF-NSML350/6-2 is the qualified substitute for the obsolete MF-NSML350-2. Both components maintain identical electrical performance specifications and regulatory certifications (cURus, TUV). The substitute part carries active product status, ensuring long-term availability and supply chain continuity.

Design considerations include the post-trip resistance differential (18 mOhms maximum for MF-NSML350-2 versus 22 mOhms maximum for MF-NSML350/6-2) and the thickness variation (0.60mm versus 1.40mm). These differences remain within the functional parameters of polymeric PTC resettable fuse operation and do not affect circuit-level performance for standard 6V, 4.6A hold current applications.

Both parts maintain ROHS3 compliance and identical moisture sensitivity levels (2A, 4 Weeks), supporting equivalent environmental and manufacturing requirements.

Frequently Asked Questions (FAQ)

Q: Can MF-NSML350/6-2 be used as a direct replacement for MF-NSML350-2 in existing designs?

A: Yes. Both parts share identical voltage (6V), hold current (4.6A), trip current (7A), and package specifications (1206 Concave surface mount). Electrical performance and regulatory certifications are equivalent.

Q: What is the significance of the post-trip resistance difference between these parts?

A: The post-trip resistance values (18 mOhms versus 22 mOhms maximum) represent the resistance state after the fuse has tripped. Both values fall within acceptable operating parameters for polymeric PTC resettable fuses and do not impact circuit functionality in standard 6V applications.

Q: Does the thickness variation affect PCB assembly compatibility?

A: The thickness difference (0.60mm versus 1.40mm) may require verification for specific PCB assembly processes, particularly for automated placement and reflow operations. Both parts maintain the same 1206 (3216 Metric) footprint and surface mount package type.

Q: Are both parts suitable for new product designs?

A: The MF-NSML350/6-2 is recommended for new designs due to its active product status. The MF-NSML350-2 is obsolete and should not be specified for new applications.

Q: What packaging options are available?

A: The MF-NSML350/6-2 is supplied in Tape & Reel (TR) packaging. Packaging specifications for the MF-NSML350-2 were not provided in the technical data.