MF-NSML200-2 PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The MF-NSML200-2 is a polymeric PTC resettable fuse manufactured by Bourns Inc., rated for 6V at 2A hold current in a 1206 surface mount package. This component is classified as obsolete, making identification of suitable substitutes essential for ongoing design support and production continuity. The part belongs to the Multifuse® MF-NSML series and is designed to provide overcurrent protection in electronic circuits through automatic reset functionality.

Key Parameters

Parameter	Value
Voltage - Max	6V
Current - Hold (Ih) (Max)	2 A
Current - Trip (It)	4 A
Current - Max	50 A
Resistance - Initial (Ri) (Min)	5 mOhms
Operating Temperature	-40°C ~ 85°C
Package / Case	1206 (3216 Metric), Concave
Mounting Type	Surface Mount
Type	Polymeric
Approval Agency	cURus, TUV
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the MF-NSML200-2 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Voltage rating must equal or exceed 6V maximum
Current hold (Ih) rating must equal 2A
Current trip (It) rating must equal 4A
Resistance characteristics must remain within acceptable operating margins

Mechanical & Package Compatibility:

Surface mount 1206 (3216 Metric) package with concave configuration
Operating temperature range of -40°C to 85°C
Polymeric PTC type construction

Regulatory & Compliance Requirements:

cURus and TUV approval certifications
ROHS3 compliance
Moisture sensitivity level 2A (4 Weeks)

The substitute part MF-NSML200/6-2 meets all critical electrical parameters while maintaining identical package geometry and regulatory certifications. Variations in time-to-trip and post-trip resistance fall within acceptable engineering tolerances for this component category.

Parameter Comparison

Parameter	MF-NSML200-2 (Main)	MF-NSML200/6-2 (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)	2 A	2 A
Current - Trip (It)	4 A	4 A
Current - Max	50 A	50 A
Time to Trip	1 s	5 s
Resistance - Initial (Ri) (Min)	5 mOhms	5 mOhms
Resistance - Post Trip (R1) (Max)	25 mOhms	40 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)
REACH Status	REACH Unaffected	REACH Unaffected
ECCN	EAR99	EAR99
HTSUS	8533.40.8070	8533.40.8070

Engineering Selection Recommendations

The MF-NSML200/6-2 is the direct substitute for the obsolete MF-NSML200-2. Both components are manufactured by Bourns Inc. and share identical electrical ratings, package geometry, and regulatory certifications. The substitute part carries active product status, ensuring long-term availability and supply chain continuity.

Key selection factors:

Compliance & Certification: Both parts maintain cURus and TUV approvals with ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements across industrial and consumer applications.

Electrical Performance: Identical voltage, hold current, trip current, and maximum current ratings ensure direct functional equivalence in circuit protection applications.

Physical Compatibility: Matching 1206 surface mount package dimensions and concave configuration allow direct PCB layout compatibility. The 0.004" (0.10mm) thickness difference is within standard PCB assembly tolerances.

Availability: The substitute part is in active production with significantly higher inventory levels (2093 pcs vs. 1060 pcs), supporting production schedules and reducing procurement risk.

Frequently Asked Questions (FAQ)

Q: Can MF-NSML200/6-2 be used as a direct replacement for MF-NSML200-2 on existing PCBs?

A: Yes. Both parts share identical electrical ratings (6V, 2A hold current, 4A trip current), matching package dimensions (1206 surface mount), and identical footprints. The 0.004" thickness variance is within standard assembly tolerances and does not affect PCB layout or reflow processing.

Q: What is the difference in time-to-trip between these parts?

A: The MF-NSML200-2 trips in 1 second, while the MF-NSML200/6-2 trips in 5 seconds. This difference reflects different thermal response characteristics but does not affect the core protection function at the specified 2A hold current and 4A trip current thresholds.

Q: Are there differences in post-trip resistance?

A: Yes. The MF-NSML200-2 has a maximum post-trip resistance of 25 mOhms, while the MF-NSML200/6-2 is rated at 40 mOhms maximum. Both values remain within acceptable operating ranges for polymeric PTC resettable fuses in this voltage and current class.

Q: Do both parts have the same regulatory approvals?

A: Yes. Both the MF-NSML200-2 and MF-NSML200/6-2 carry cURus and TUV certifications, maintain ROHS3 compliance, and are REACH unaffected. They share identical ECCN (EAR99) and HTSUS (8533.40.8070) classifications.

Q: What is the packaging difference?

A: The MF-NSML200-2 is supplied in standard packaging, while the MF-NSML200/6-2 is available in Tape & Reel (TR) format. Tape & Reel packaging is standard for high-volume surface mount assembly and does not affect component performance or compatibility.

Q: Why is the MF-NSML200-2 listed as obsolete?

A: Product obsolescence typically reflects manufacturer discontinuation decisions based on market demand and product line consolidation. The MF-NSML200/6-2 represents the active equivalent within the Multifuse® product family, ensuring continued support for this protection function.

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