MF-SM250-2-006 Polymeric PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The MF-SM250-2-006 is a polymeric PTC resettable fuse manufactured by Bourns Inc. in the Multifuse® MF-SM series. This component provides overcurrent protection with automatic recovery capability in surface mount applications. The part is active in production status with AEC-Q200 automotive-grade qualification and full RoHS3 compliance. Substitute parts are identified based on matching electrical specifications, mechanical compatibility, and regulatory certifications to ensure direct functional equivalence in circuit design.

Substiute Parts

MF-SM250-2-006

Bourns Inc.In Stock: 1051MF-SM250-2-006 Datasheet

Current PartRFQ

MF-SM250-2

Bourns Inc.In Stock: 2720MF-SM250-2 Datasheet

Parametric EquivalentRFQ

PFSM.250.2

SCHURTER Inc.In Stock: 5701PFSM.250.2 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MF-SM250-2-006 are qualified based on the following criteria:

Electrical Parameters (Critical for Substitution):

• Voltage - Max: 15V
• Current - Hold (Ih) (Max): 2.5 A
• Current - Trip (It): 5 A
• Current - Max: 100 A
• Time to Trip: 25 s
• Resistance - Initial (Ri) (Min): 24 mOhms
• Resistance - Post Trip (R1) (Max): 85 mOhms
• Operating Temperature: -40°C ~ 85°C

Mechanical Parameters (Critical for Substitution):

• Mounting Type: Surface Mount
• Package / Case: 2-SMD
• Size / Dimension: 0.344" L x 0.264" W (8.75mm x 6.71mm)
• Thickness (Max): 0.118" (3.00mm)

Regulatory & Compliance Parameters:

• Ratings: AEC-Q200
• Approval Agency: cURus, TUV
• RoHS Status: ROHS3 Compliant

All identified substitute parts match these parameters exactly, ensuring direct functional and mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

All three parts—MF-SM250-2-006, MF-SM250-2, and PFSM.250.2—are functionally equivalent for circuit design purposes. Selection between them is determined by:

Product Availability & Packaging:

• MF-SM250-2-006 (Bourns): 945 Pcs in stock, packaging format not specified
• MF-SM250-2 (Bourns): 2622 Pcs in stock, available in Cut Tape (CT) & Digi-Reel® formats
• PFSM.250.2 (SCHURTER): 5639 Pcs in stock, available in Tape & Reel (TR) format

Compliance & Certifications: All parts carry AEC-Q200 automotive-grade qualification, cURus and TUV approval, and ROHS3 compliance. The PFSM.250.2 has MSL classification as Not Applicable, while both Bourns parts have MSL 1 (Unlimited), indicating no moisture sensitivity constraints.

Manufacturer Considerations: Both Bourns and SCHURTER are established manufacturers of polymeric PTC resettable fuses. Selection may depend on supply chain strategy, existing vendor relationships, or regional availability.

Frequently Asked Questions (FAQ)

Q: Can MF-SM250-2 be used as a direct replacement for MF-SM250-2-006?

A: Yes. Both parts are manufactured by Bourns Inc. and share identical electrical specifications, mechanical dimensions, and regulatory certifications. The difference is packaging format: MF-SM250-2 is available in Cut Tape (CT) & Digi-Reel® formats, while MF-SM250-2-006 uses a different packaging designation. Electrical performance and PCB footprint compatibility are identical.

Q: Is PFSM.250.2 from SCHURTER compatible with the Bourns MF-SM250-2-006?

A: Yes. The PFSM.250.2 matches all critical electrical parameters (15V, 2.5A hold current, 5A trip current, 25s trip time, 24mOhms initial resistance, 85mOhms post-trip resistance) and mechanical specifications (2-SMD package, 8.75mm x 6.71mm dimensions, 3.00mm thickness). Both parts carry AEC-Q200 qualification and cURus/TUV approval. The primary difference is packaging format (Tape & Reel vs. other formats) and manufacturer.

Q: What are the key parameters that determine substitutability?

A: Substitutability is determined by: (1) Voltage rating (15V), (2) Current hold specification (2.5A), (3) Current trip specification (5A), (4) Trip time (25s), (5) Initial and post-trip resistance values, (6) Operating temperature range (-40°C to 85°C), (7) Surface mount 2-SMD package type, (8) Physical dimensions (0.344" x 0.264" x 0.118"), and (9) Regulatory certifications (AEC-Q200, cURus, TUV, RoHS3).

Q: Does packaging format affect electrical performance?

A: No. Packaging format (Cut Tape, Digi-Reel, or Tape & Reel) affects supply chain logistics and handling but does not alter electrical characteristics or circuit performance. All three parts deliver identical functional performance when soldered to the PCB.

Q: Are there any temperature or environmental differences between these parts?

A: All three parts operate across the same temperature range (-40°C to 85°C). The PFSM.250.2 has MSL classification as Not Applicable, while Bourns parts have MSL 1 (Unlimited), indicating no moisture sensitivity constraints for any of these components.