MF-NSML150-2 Equivalent & Substitute Parts

Part Overview

The MF-NSML150-2 is a Polymeric PTC Resettable Fuse manufactured by Bourns Inc., rated for 6V maximum voltage with 1.5A 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 listed as Obsolete, making identification of suitable substitutes essential for ongoing production and maintenance applications. Active equivalent parts are available to ensure design continuity and supply chain reliability.

Key Parameters

Parameter	Value
Voltage - Max	6V
Current - Hold (Ih) (Max)	1.5 A
Current - Trip (It)	3 A
Current - Max	50 A
Resistance - Initial (Ri) (Min)	10 mOhms
Resistance - Post Trip (R1) (Max)	65 mOhms
Operating Temperature Range	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	1206 (3216 Metric), Concave
Size / Dimension	0.128" L x 0.063" W (3.25mm x 1.60mm)
Thickness (Max)	0.024" (0.60mm)
Approval Agency	cURus, TUV
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	2A (4 Weeks)

Substitute Part Grouping Explanation

Substitution of the MF-NSML150-2 is determined by strict equivalence across the following critical parameters:

Voltage rating: 6V maximum
Hold current (Ih): 1.5A maximum
Trip current (It): 3A
Initial resistance (Ri): 10 mOhms minimum
Post-trip resistance (R1): 65 mOhms maximum
Operating temperature range: -40°C to 85°C
Package format: 1206 (3216 Metric) with concave profile
Physical dimensions: 0.128" L x 0.063" W
Regulatory compliance: cURus and TUV approval

The MF-NSML150/6-2 meets all these criteria and is classified as a direct equivalent. Both parts share identical electrical specifications, regulatory certifications, and mechanical compatibility. The primary distinction is product status and packaging format.

Parameter Comparison

Parameter	MF-NSML150-2 (Main Part)	MF-NSML150/6-2 (Substitute)
Manufacturer	Bourns Inc.	Bourns Inc.
Series	Multifuse®, MF-NSML	Multifuse®, MF-NSML/X
Product Status	Obsolete	Active
Type	Polymeric	Polymeric
Voltage - Max	6V	6V
Current - Hold (Ih) (Max)	1.5 A	1.5 A
Current - Trip (It)	3 A	3 A
Current - Max	50 A	50 A
Time to Trip	500 ms	5 s
Resistance - Initial (Ri) (Min)	10 mOhms	10 mOhms
Resistance - Post Trip (R1) (Max)	65 mOhms	65 mOhms
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount
Package / Case	1206 (3216 Metric), Concave	1206 (3216 Metric), Concave
Size / Dimension	0.128" L x 0.063" W (3.25mm x 1.60mm)	0.128" L x 0.063" W (3.25mm x 1.60mm)
Thickness (Max)	0.024" (0.60mm)	0.028" (0.70mm)
Approval Agency	cURus, TUV	cURus, TUV
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	2A (4 Weeks)	2A (4 Weeks)
Packaging Format	Bulk	Tape & Reel (TR)
Inventory Status	1132 Pcs New Original In Stock	15069 Pcs New Original In Stock

Engineering Selection Recommendations

The MF-NSML150/6-2 is the direct equivalent for the obsolete MF-NSML150-2. Both components are manufactured by Bourns Inc. and carry identical electrical ratings, thermal operating range, and regulatory certifications (cURus and TUV approval). Both meet ROHS3 compliance requirements and share the same moisture sensitivity classification.

The MF-NSML150/6-2 is currently in Active product status with significantly higher inventory availability (15069 units versus 1132 units), ensuring reliable supply chain access. The substitute part is supplied in Tape & Reel (TR) packaging format, which is standard for production environments.

A minor dimensional variance exists in maximum thickness: the substitute measures 0.028" (0.70mm) compared to 0.024" (0.60mm) for the main part. This 0.004" difference remains within typical PCB assembly tolerances and does not affect electrical performance or mechanical fit in standard 1206 footprints.

The time-to-trip specification differs between the two parts (500 ms versus 5 s). This parameter should be evaluated against circuit protection requirements to ensure the substitute meets application-specific response timing needs.

Frequently Asked Questions (FAQ)

Q: Can MF-NSML150/6-2 be used as a direct replacement for MF-NSML150-2?

A: Yes. Both parts share identical voltage ratings (6V), hold current (1.5A), trip current (3A), resistance specifications, operating temperature range (-40°C to 85°C), and package format (1206 Concave). Both carry cURus and TUV certifications and are ROHS3 compliant. The primary difference is product status and packaging format.

Q: What is the significance of the time-to-trip difference?

A: The MF-NSML150-2 has a 500 ms trip time, while the MF-NSML150/6-2 has a 5 s trip time. This affects how quickly the fuse responds to overcurrent conditions. Circuit designers must confirm that the 5 s response time of the substitute meets the protection requirements of the target application.

Q: Does the thickness difference affect PCB assembly?

A: The substitute part is 0.004" (0.10mm) thicker than the main part. This minor variance is within standard PCB assembly tolerances for 1206 components and does not affect placement, soldering, or mechanical fit on standard footprints.

Q: Why is the substitute part in Tape & Reel format?

A: Tape & Reel (TR) packaging is the standard production format for surface mount components. The main part's bulk packaging reflects its obsolete status. The substitute's TR format is suitable for automated assembly processes.

Q: Are there any compliance or certification differences?

A: No. Both parts carry identical regulatory approvals (cURus and TUV), meet ROHS3 compliance, and share the same Moisture Sensitivity Level (2A, 4 Weeks). No additional qualification is required from a compliance perspective.

Q: What inventory considerations should be factored into the selection?

A: The MF-NSML150/6-2 has substantially higher inventory availability (15069 units) compared to the main part (1132 units). For new designs or production ramp-up, the substitute ensures reliable long-term supply access.

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