MF-NSML380-2 PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The MF-NSML380-2 is a polymeric PTC resettable fuse manufactured by Bourns Inc., designed for surface mount applications in the 1206 (3216 Metric) package. This component provides overcurrent protection with a 6V maximum voltage rating and 3.8A hold current specification. The part is currently listed as obsolete, making identification of compatible substitutes essential for ongoing design support and production continuity. The substitute MF-NSML380/6-2 maintains electrical equivalence while offering active product status and improved availability.

Key Parameters

Parameter	Value	Unit
Voltage - Max	6	V
Current - Hold (Ih) (Max)	3.8	A
Current - Trip (It)	8	A
Current - Max	50	A
Time to Trip	5	s
Resistance - Initial (Ri) (Min)	1.5	mOhms
Operating Temperature Range	-40 to 85	°C
Package / Case	1206 (3216 Metric), Concave	-
Mounting Type	Surface Mount	-
RoHS Status	ROHS3 Compliant	-
Approval Agency	cURus, TUV	-

Substitute Part Grouping Explanation

The MF-NSML380/6-2 qualifies as a direct substitute for the MF-NSML380-2 based on the following critical parameters:

Voltage rating: Both parts rated at 6V maximum
Hold current (Ih): Both specified at 3.8A maximum
Package configuration: Identical 1206 (3216 Metric) surface mount form factor
Mounting type: Both surface mount
Thermal operating range: Both -40°C to 85°C
Compliance certifications: Both cURus and TUV approved, ROHS3 compliant

The substitute part maintains functional equivalence for overcurrent protection applications within the specified electrical and thermal parameters. Packaging format (Tape & Reel for MF-NSML380/6-2 versus bulk for MF-NSML380-2) represents a logistical difference without affecting electrical or mechanical compatibility.

Parameter Comparison

Parameter	MF-NSML380-2	MF-NSML380/6-2	Compatibility
Voltage - Max	6V	6V	Equivalent
Current - Hold (Ih) (Max)	3.8A	3.8A	Equivalent
Current - Trip (It)	8A	7.6A	Compatible
Current - Max	50A	50A	Equivalent
Time to Trip	5s	5s	Equivalent
Resistance - Initial (Ri) (Min)	1.5 mOhms	2 mOhms	Compatible
Resistance - Post Trip (R1) (Max)	14 mOhms	20 mOhms	Compatible
Operating Temperature	-40 to 85°C	-40 to 85°C	Equivalent
Package / Case	1206 (3216 Metric), Concave	1206 (3216 Metric), Concave	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Approval Agency	cURus, TUV	cURus, TUV	Equivalent
Product Status	Obsolete	Active	Substitute Available

Engineering Selection Recommendations

The MF-NSML380/6-2 is the appropriate substitute for the obsolete MF-NSML380-2 in new designs and production continuity applications. Both parts maintain identical voltage and hold current specifications, ensuring functional equivalence in overcurrent protection circuits. The substitute part carries active product status with confirmed inventory availability (984 pcs), providing supply chain reliability compared to the obsolete original part (1057 pcs remaining stock).

Both parts satisfy identical regulatory requirements: cURus and TUV approvals, ROHS3 compliance, and REACH unaffected status. The electrical parameter variations (Current - Trip: 8A vs 7.6A; Resistance values within specified ranges) fall within acceptable tolerances for polymeric PTC fuse technology and do not compromise circuit protection function.

Selection between these parts should be based on packaging requirements: the MF-NSML380-2 is available in bulk form, while the MF-NSML380/6-2 is supplied in Tape & Reel format. For production environments, Tape & Reel packaging typically offers handling and assembly advantages.

Frequently Asked Questions (FAQ)

Q: Can MF-NSML380/6-2 directly replace MF-NSML380-2 in existing circuit designs?

A: Yes. Both parts share identical voltage rating (6V), hold current (3.8A), package configuration (1206 surface mount), and thermal operating range (-40 to 85°C). The parts are electrically and mechanically interchangeable.

Q: What is the significance of the different Current - Trip values (8A vs 7.6A)?

A: Both values fall within the normal operating specification range for polymeric PTC resettable fuses. The 0.4A difference represents inherent manufacturing tolerance in this component category and does not affect circuit protection performance.

Q: Does the packaging difference (bulk vs Tape & Reel) affect electrical performance?

A: No. Packaging format is a logistical consideration only. Tape & Reel (MF-NSML380/6-2) and bulk (MF-NSML380-2) formats contain identical electrical components with identical performance characteristics.

Q: Are both parts compliant with current regulatory standards?

A: Yes. Both MF-NSML380-2 and MF-NSML380/6-2 are ROHS3 compliant, REACH unaffected, and carry cURus and TUV approvals. Regulatory compliance is equivalent between the two parts.

Q: Why is MF-NSML380-2 listed as obsolete if MF-NSML380/6-2 is available?

A: Product status reflects manufacturer lifecycle decisions. The MF-NSML380/6-2 represents the current active product line for this electrical specification. Existing MF-NSML380-2 inventory remains available for legacy support, but new designs should specify MF-NSML380/6-2.

Q: What is the Moisture Sensitivity Level (MSL) for these parts?

A: Both parts are rated MSL 2A (4 Weeks), indicating standard moisture handling requirements for surface mount components during storage and assembly.

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