MF-MSMD020-2 Equivalent & Substitute Parts

Part Overview

The MF-MSMD020-2 is a Polymeric PTC Resettable Fuse rated at 30V, 200 mA hold current, manufactured by Bourns Inc. in the 1812 (4532 Metric) surface mount package. This component is classified as Obsolete, making identification of active equivalent parts essential for ongoing design support and procurement.

PTC resettable fuses provide automatic overcurrent protection by increasing resistance when current exceeds the trip threshold, then resetting when the fault condition is removed. The obsolete status of the MF-MSMD020-2 necessitates evaluation of active substitute parts that maintain electrical and mechanical compatibility.

Substiute Parts

MF-MSMD020-2

Bourns Inc.In Stock: 3459MF-MSMD020-2 Datasheet

Current PartRFQ

MF-MSMF020-2

Bourns Inc.In Stock: 51210MF-MSMF020-2 Datasheet

DirectRFQ

PFMF.020.2

SCHURTER Inc.In Stock: 4959PFMF.020.2 Datasheet

DirectRFQ

PTS181230V020

Eaton - Electronics DivisionIn Stock: 5744PTS181230V020 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MF-MSMD020-2 are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

• Voltage rating: 30V maximum
• Current hold (Ih): 200 mA maximum
• Current trip (It): 400 mA
• Package: 1812 (4532 Metric) surface mount
• Operating temperature range: -40°C to 85°C
• Type: Polymeric PTC resettable fuse

Allowable Variations:

• Resistance values (initial and post-trip) may vary within functional limits
• Time to trip may differ based on manufacturer design
• Physical dimensions may vary slightly (thickness, width) while maintaining 1812 package classification
• RoHS compliance status may differ
• Packaging format (Cut Tape, Tape & Reel) does not affect electrical equivalence

Three active substitute parts meet these criteria: MF-MSMF020-2 (Bourns), PFMF.020.2 (SCHURTER), and PTS181230V020 (Eaton).

Parameter Comparison

Engineering Selection Recommendations

MF-MSMF020-2 (Bourns Inc.) is the primary recommended substitute. It is manufactured by the same supplier as the obsolete part, maintains identical electrical specifications (voltage, current hold, current trip, resistance values, and time to trip), and is actively produced. The part carries ROHS3 compliance and cURus/TUV certifications. The concave package variant is mechanically compatible with standard 1812 footprints.

PFMF.020.2 (SCHURTER Inc.) provides an alternative from a different manufacturer. Electrical parameters match the main part exactly, with ROHS3 compliance and cURus/TUV certifications. This part is suitable for applications where multi-source qualification is required.

PTS181230V020 (Eaton - Electronics Division) offers a substitute with minor parameter variations. Initial resistance is higher (800 mOhms vs. 400 mOhms), time to trip is faster (20 ms vs. 60 ms), and maximum current rating is higher (100 A vs. 80 A). This part is ROHS3 compliant with cURus/TUV certifications. Selection of this part requires confirmation that the faster trip time and higher initial resistance do not impact circuit performance.

All three substitutes are actively produced and carry modern compliance certifications, addressing the obsolescence of the original part.

Frequently Asked Questions (FAQ)

Q: Can MF-MSMF020-2 be used as a direct replacement for MF-MSMD020-2?

A: Yes. Both parts share identical electrical specifications: 30V rating, 200 mA hold current, 400 mA trip current, 400 mOhms initial resistance, and 60 ms trip time. The MF-MSMF020-2 is the active equivalent from Bourns and is mechanically compatible with the same 1812 footprint.

Q: What is the difference between the concave and non-concave package variants?

A: The MF-MSMD020-2 features a standard 1812 package, while substitute parts (MF-MSMF020-2, PFMF.020.2, PTS181230V020) use a concave variant. Both are classified as 1812 (4532 Metric) and are compatible with standard 1812 PCB footprints. The concave design affects only the top surface profile and does not impact electrical performance or solderability.

Q: Why does PTS181230V020 have different resistance and trip time specifications?

A: PTS181230V020 is manufactured by Eaton using different polymer formulation and design parameters. The higher initial resistance (800 mOhms) and faster trip time (20 ms) reflect Eaton's design approach. While these differences remain within acceptable PTC fuse operation, circuit designers must confirm compatibility with their specific overcurrent protection requirements.

Q: Are all substitute parts RoHS compliant?

A: The original MF-MSMD020-2 is RoHS non-compliant. All three substitute parts (MF-MSMF020-2, PFMF.020.2, PTS181230V020) are ROHS3 compliant, meeting current environmental regulations.

Q: Which substitute part should be selected for new designs?

A: MF-MSMF020-2 is recommended for new designs as it maintains complete electrical and thermal equivalence to the obsolete part while offering active production status and modern compliance certifications from the original manufacturer.

Q: Can these parts be used interchangeably in existing assemblies?

A: MF-MSMF020-2 and PFMF.020.2 are fully interchangeable. PTS181230V020 requires circuit validation due to differences in initial resistance and trip time before implementation in existing designs.