MF-MSMD050-2 Polymeric PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The MF-MSMD050-2 is a polymeric PTC resettable fuse manufactured by Bourns Inc., rated for 15V at 500 mA hold current in a 1812 (4532 Metric) surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Polymeric PTC resettable fuses function as automatic reset protection devices, interrupting circuit current when thermal conditions exceed design thresholds and restoring operation when the fault condition clears. The MF-MSMD050-2 series has been superseded by active production alternatives that maintain electrical compatibility while offering improved manufacturing availability and compliance status.

Substiute Parts

MF-MSMD050-2

Bourns Inc.In Stock: 3978MF-MSMD050-2 Datasheet

Current PartRFQ

MF-MSMF050-2

Bourns Inc.In Stock: 32466MF-MSMF050-2 Datasheet

DirectRFQ

0ZCG0050FF2C

Bel Fuse Inc.In Stock: 22350ZCG0050FF2C Datasheet

DirectRFQ

PFMF.050.2

SCHURTER Inc.In Stock: 5440PFMF.050.2 Datasheet

DirectRFQ

PTS181216V050

Eaton - Electronics DivisionIn Stock: 1324PTS181216V050 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MF-MSMD050-2 is determined by the following critical parameters:

• Voltage rating must be equal to or greater than 15V
• Current hold (Ih) must equal 500 mA
• Current trip (It) must equal 1 A
• Package must be 1812 (4532 Metric) surface mount
• Time to trip must be 150 ms
• Resistance characteristics (Ri minimum 150 mOhms, R1 maximum 1 Ohms) must be maintained
• Operating temperature range must cover -40°C to 85°C

Four direct substitutes meet these criteria across three manufacturers: Bourns Inc., Bel Fuse Inc., SCHURTER Inc., and Eaton Electronics Division. All substitute parts maintain identical electrical performance specifications while offering active product status and improved compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

All four substitute parts maintain full electrical and thermal equivalence to the MF-MSMD050-2. Selection should be based on product status, compliance requirements, and certification needs:

MF-MSMF050-2 (Bourns Inc.) is the primary recommended substitute, offering active product status, ROHS3 compliance, and continued manufacturer support. This part represents the direct evolution within the Bourns Multifuse product line and carries AEC-Q200 automotive qualification.

0ZCG0050FF2C (Bel Fuse Inc.) and PTS181216V050 (Eaton Electronics Division) provide 16V rated alternatives, offering additional voltage margin above the 15V requirement. Both carry AEC-Q200 certification and ROHS3 compliance. The 0ZCG0050FF2C features MSL 2A rating, while PTS181216V050 maintains MSL 1 (Unlimited).

PFMF.050.2 (SCHURTER Inc.) maintains exact 15V specification with ROHS3 compliance and active product status. This option is suitable for applications requiring SCHURTER supply chain integration.

Frequently Asked Questions (FAQ)

Q: Can MF-MSMD050-2 be directly replaced with MF-MSMF050-2?

A: Yes. Both parts share identical electrical specifications: 15V, 500 mA hold current, 1 A trip current, 150 ms trip time, and 1812 package footprint. The MF-MSMF050-2 is the active production equivalent with improved compliance status.

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

A: The MF-MSMD050-2 uses a standard 1812 package, while all substitute parts feature concave geometry. Concave packages provide improved solder joint reliability and are standard in current production. PCB footprints remain compatible for both variants.

Q: Are the 16V rated substitutes (0ZCG0050FF2C and PTS181216V050) suitable for 15V circuits?

A: Yes. Higher voltage ratings are fully compatible with lower voltage applications. The 16V parts provide additional design margin and are electrically equivalent at 15V operation.

Q: What compliance certifications are critical for my application?

A: All substitute parts carry cURus and TUV certifications. The 0ZCG0050FF2C and PTS181216V050 additionally carry AEC-Q200 automotive qualification. The MF-MSMF050-2 also carries AEC-Q200. Select based on your specific regulatory or customer requirements.

Q: Does RoHS compliance affect electrical performance?

A: No. ROHS3 compliance affects material composition only, not electrical characteristics. All substitute parts maintain identical electrical performance to the obsolete MF-MSMD050-2.

Q: Can I use these parts interchangeably on the same PCB?

A: Yes, for the electrical function. All parts use identical 1812 (4532 Metric) footprints. Verify mechanical clearance for concave package variants in your specific layout.