Equivalent & Substitute Parts for MF-MSMD014-2

Part Overview

The MF-MSMD014-2 is a polymeric PTC resettable fuse manufactured by Bourns Inc., rated for 60V maximum voltage with a 140 mA hold current. This component is designed for surface mount applications in the 1812 (4532 Metric) package format. The main part is currently listed as obsolete, making identification of active equivalent components essential for ongoing design support and procurement.

Key Parameters

Parameter	Value
Voltage - Max	60V
Current - Hold (Ih) (Max)	140 mA
Current - Trip (It)	340 mA
Current - Max	40 A
Time to Trip	150 ms
Resistance - Initial (Ri) (Min)	400 mOhms
Resistance - Post Trip (R1) (Max)	6.5 Ohms
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-MSMD014-2 is determined by strict equivalence across the following critical parameters:

Voltage rating: 60V maximum
Hold current (Ih): 140 mA maximum
Trip current (It): 340 mA
Time to trip: 150 ms
Initial resistance (Ri): 400 mOhms minimum
Post-trip resistance (R1): 6.5 Ohms maximum
Operating temperature range: -40°C to 85°C
Mounting type: Surface mount
Package format: 1812 (4532 Metric)
Component type: Polymeric PTC resettable fuse

Two active substitute parts meet these electrical and mechanical specifications: MF-MSMF014-2 from Bourns Inc. and PFMF.014.2 from SCHURTER Inc. Both maintain identical electrical performance parameters while offering improved product status and compliance certifications.

Parameter Comparison

Parameter	MF-MSMD014-2 (Main)	MF-MSMF014-2 (Substitute)	PFMF.014.2 (Substitute)
Manufacturer	Bourns Inc.	Bourns Inc.	SCHURTER Inc.
Product Status	Obsolete	Active	Active
Voltage - Max	60V	60V	60V
Current - Hold (Ih) (Max)	140 mA	140 mA	140 mA
Current - Trip (It)	340 mA	340 mA	340 mA
Current - Max	40 A	40 A	40 A
Time to Trip	150 ms	150 ms	150 ms
Resistance - Initial (Ri) (Min)	400 mOhms	400 mOhms	400 mOhms
Resistance - Post Trip (R1) (Max)	6.5 Ohms	6.5 Ohms	6.5 Ohms
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
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	CSA, TUV, UR	cURus, TUV	cURus, TUV

Engineering Selection Recommendations

Both substitute parts provide electrical equivalence to the MF-MSMD014-2 across all specified parameters. Selection between MF-MSMF014-2 and PFMF.014.2 depends on supply chain and compliance requirements:

MF-MSMF014-2 maintains the Bourns Inc. manufacturer lineage with active product status and ROHS3 compliance. This part carries AEC-Q200 automotive qualification ratings and cURus/TUV certifications.

PFMF.014.2 from SCHURTER Inc. provides equivalent electrical performance with ROHS3 compliance and cURus/TUV certifications. This option expands supplier diversity for procurement strategies.

Both parts feature concave package geometry in the 1812 (4532 Metric) format, which differs from the convex geometry of the obsolete MF-MSMD014-2. This geometric change does not affect electrical function but may require PCB footprint verification for mechanical fit.

Frequently Asked Questions (FAQ)

Q: Can MF-MSMF014-2 and PFMF.014.2 be used interchangeably with MF-MSMD014-2?

A: Both substitute parts meet all electrical specifications of the MF-MSMD014-2, including voltage rating, hold current, trip current, resistance values, and operating temperature range. The primary difference is package geometry (concave vs. convex), which requires PCB footprint compatibility verification.

Q: What is the significance of the concave package geometry in the substitute parts?

A: The concave package geometry in MF-MSMF014-2 and PFMF.014.2 represents a design refinement from the original MF-MSMD014-2. Both maintain the 1812 (4532 Metric) footprint dimensions but with reduced thickness (0.043" vs. unspecified for the main part). PCB layout compatibility must be confirmed before implementation.

Q: Why is the MF-MSMD014-2 listed as obsolete?

A: The MF-MSMD014-2 is obsolete and no longer in active production. The MF-MSMF014-2 represents the current active equivalent from Bourns Inc. with improved compliance certifications.

Q: Are there compliance differences between the substitute parts?

A: MF-MSMF014-2 carries AEC-Q200 automotive qualification, while PFMF.014.2 does not list this rating. Both parts are ROHS3 compliant and hold cURus/TUV certifications. Selection should align with application-specific compliance requirements.

Q: What is the difference between CSA/TUV/UR and cURus/TUV certifications?

A: Both certification sets provide safety approvals for the component. The substitute parts carry cURus (combined UL and CSA recognition) and TUV certifications, which provide equivalent safety validation for the specified electrical parameters.

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