MF-NSML500-2 PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The MF-NSML500-2 is a Polymeric PTC Resettable Fuse manufactured by Bourns Inc., rated for 6V at 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 -40°C to 85°C and meets cURus and TUV approval standards with ROHS3 compliance.

Substiute Parts

MF-NSML500-2

Bourns Inc.In Stock: 891MF-NSML500-2 Datasheet

Current PartRFQ

MF-NSML500/6-2

Bourns Inc.In Stock: 3138MF-NSML500/6-2 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MF-NSML500-2 is determined by the following critical parameters:

Voltage rating must remain at 6V maximum. Current hold (Ih) specification must be 5A maximum. Current trip (It) must be 10A. Package configuration must be 1206 (3216 Metric), Concave surface mount. Operating temperature range must span -40°C to 85°C. Approval certifications must include cURus and TUV. RoHS compliance status must be ROHS3 Compliant.

The MF-NSML500/6-2 meets all these criteria and qualifies as a direct substitute. Variations in time-to-trip specification, initial resistance (Ri), and post-trip resistance (R1) are within acceptable tolerance ranges for this component category and do not preclude substitution when electrical performance requirements align with the specified parameters.

Parameter Comparison

Engineering Selection Recommendations

The MF-NSML500/6-2 is the qualified substitute for the obsolete MF-NSML500-2. Both parts maintain identical voltage, current hold, and current trip specifications. The substitute carries Active product status, ensuring long-term availability and supply chain continuity. Both components hold equivalent regulatory approvals (cURus, TUV) and maintain ROHS3 compliance with identical REACH and ECCN classifications.

The MF-NSML500/6-2 features a reduced thickness (0.039" versus 0.047"), which may provide design flexibility in space-constrained applications. The extended time-to-trip specification (5s versus 2s) and marginally higher initial resistance (2 mOhms versus 1 mOhms) represent minor performance variations within the acceptable tolerance envelope for this component category. These differences do not impact functional compatibility when circuit protection requirements align with the specified 5A hold current and 10A trip current parameters.

Frequently Asked Questions (FAQ)

Q: Can the MF-NSML500/6-2 be used as a direct replacement for the MF-NSML500-2?

A: Yes. Both parts share identical voltage (6V), current hold (5A), current trip (10A), package configuration (1206 Concave), and operating temperature range (-40°C to 85°C). Regulatory approvals and RoHS compliance are equivalent.

Q: What is the significance of the different time-to-trip values (2s vs. 5s)?

A: Time-to-trip indicates the response speed to overcurrent conditions. The MF-NSML500/6-2 exhibits a slower response. Circuit designs must accommodate this characteristic if precise trip timing is critical to system protection strategy.

Q: Does the thickness difference (0.047" vs. 0.039") affect PCB layout?

A: The MF-NSML500/6-2 is thinner by 0.008" (0.20mm). This may provide clearance advantages in compact designs but does not create compatibility issues. Footprint dimensions remain identical.

Q: Are packaging options different between these parts?

A: The MF-NSML500-2 packaging is listed as "-" (unspecified). The MF-NSML500/6-2 is supplied in Tape & Reel (TR) format, which is standard for production environments and does not affect component electrical performance.

Q: Why is the MF-NSML500-2 classified as Obsolete?

A: Obsolete status indicates the manufacturer has discontinued active production. The MF-NSML500/6-2 remains in Active production status, making it the appropriate choice for new designs and ongoing production support.