MF-MSMD150-2 Equivalent & Substitute Parts

Part Overview

The MF-MSMD150-2 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 1812 (4532 Metric) package format. The part is currently listed as obsolete, making identification of equivalent and substitute components essential for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Voltage - Max	6V
Current - Hold (Ih) (Max)	1.5 A
Current - Trip (It)	3 A
Current - Max	100 A
Time to Trip	500 ms
Resistance - Initial (Ri) (Min)	30 mOhms
Resistance - Post Trip (R1) (Max)	120 mOhms
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	1812 (4532 Metric)
Type	Polymeric

Substitute Part Grouping Explanation

Substitution for the MF-MSMD150-2 is determined by strict equivalence across the following critical parameters:

Voltage rating: 6V maximum
Hold current (Ih): 1.5A maximum
Trip current (It): 3A
Time to trip: 500 ms
Initial resistance (Ri): 30 mOhms minimum
Post-trip resistance (R1): 120 mOhms maximum
Operating temperature range: -40°C to 85°C
Package format: 1812 (4532 Metric) surface mount
Component type: Polymeric PTC resettable fuse

Two direct substitutes meet these criteria: MF-MSMF150-2 from Bourns Inc. and PFMF.150.2 from SCHURTER Inc. Both components maintain identical electrical performance specifications and package compatibility while offering improved product status and compliance certifications.

Parameter Comparison

Parameter	MF-MSMD150-2	MF-MSMF150-2	PFMF.150.2
Manufacturer	Bourns Inc.	Bourns Inc.	SCHURTER Inc.
Voltage - Max	6V	6V	6V
Current - Hold (Ih) (Max)	1.5 A	1.5 A	1.5 A
Current - Trip (It)	3 A	3 A	3 A
Current - Max	100 A	100 A	100 A
Time to Trip	500 ms	500 ms	500 ms
Resistance - Initial (Ri) (Min)	30 mOhms	30 mOhms	30 mOhms
Resistance - Post Trip (R1) (Max)	120 mOhms	120 mOhms	120 mOhms
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	1812 (4532 Metric)	1812 (4532 Metric), Concave	1812 (4532 Metric), Concave
Type	Polymeric	Polymeric	Polymeric
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	CSA, TUV, UR	cURus, TUV	cURus, TUV

Engineering Selection Recommendations

The MF-MSMD150-2 is obsolete and no longer in active production. Both substitute parts maintain full electrical and mechanical compatibility while offering significant advantages:

MF-MSMF150-2 (Bourns Inc.) is the primary substitute, maintaining the same manufacturer lineage with active product status. This part carries AEC-Q200 automotive qualification and ROHS3 compliance, making it suitable for applications requiring modern regulatory adherence. Inventory availability is substantial at 12,774 pieces.

PFMF.150.2 (SCHURTER Inc.) provides an alternative from an established manufacturer with active product status and ROHS3 compliance. This part is available in Tape & Reel packaging with 2,104 pieces in stock. Selection between the two substitutes depends on supply chain preferences and existing qualification documentation for either manufacturer.

Frequently Asked Questions (FAQ)

Q: Can MF-MSMF150-2 or PFMF.150.2 be used as direct replacements for MF-MSMD150-2?

A: Yes. Both parts are electrically and mechanically equivalent across all critical parameters: 6V voltage rating, 1.5A hold current, 3A trip current, 500ms trip time, and identical resistance specifications. All three components use the 1812 (4532 Metric) surface mount package. The substitute parts are pin-compatible and functionally interchangeable.

Q: What is the difference between the MF-MSMD150-2 and MF-MSMF150-2?

A: The primary differences are product status and compliance. MF-MSMD150-2 is obsolete and RoHS non-compliant, while MF-MSMF150-2 is active and ROHS3 compliant. The MF-MSMF150-2 also features a concave package profile and includes AEC-Q200 automotive qualification. Electrical performance is identical.

Q: Are there packaging differences between these parts?

A: The MF-MSMD150-2 uses standard 1812 (4532 Metric) packaging. Both MF-MSMF150-2 and PFMF.150.2 use concave variants of the same 1812 (4532 Metric) package. The concave profile is a minor mechanical variation that does not affect electrical performance or PCB footprint compatibility for standard surface mount assembly.

Q: Which substitute should be selected for new designs?

A: For new designs, either MF-MSMF150-2 or PFMF.150.2 is appropriate. Selection should be based on supply chain availability, existing manufacturer relationships, and any specific qualification requirements. Both parts carry current product status and modern compliance certifications.

Q: What compliance certifications apply to these parts?

A: MF-MSMD150-2 carries CSA, TUV, and UR approvals but is RoHS non-compliant. MF-MSMF150-2 and PFMF.150.2 both carry cURus and TUV approvals and are ROHS3 compliant. All three parts are REACH unaffected and classified as EAR99 for export control purposes.

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