MF-SM125-2-006 Equivalent & Substitute Parts

Part Overview

The MF-SM125-2-006 is a polymeric PTC resettable fuse manufactured by Bourns Inc. in the Multifuse® MF-SM series. This component provides overcurrent protection with a hold current of 1.25 A and trip current of 2.5 A at a maximum voltage rating of 15V. The device is designed for surface mount applications in 2-SMD package configuration and is AEC-Q200 rated for automotive-grade reliability.

Substitute parts are identified to address inventory availability, packaging format requirements, or equivalent performance specifications while maintaining electrical and mechanical compatibility within the defined parameter tolerance.

Key Parameters

Parameter	Value	Unit
Voltage - Max	15	V
Current - Hold (Ih) (Max)	1.25	A
Current - Trip (It)	2.5	A
Current - Max	100	A
Time to Trip	2	s
Resistance - Initial (Ri) (Min)	70	mOhms
Resistance - Post Trip (R1) (Max)	250	mOhms
Operating Temperature Range	-40 to 85	°C
Mounting Type	Surface Mount	—
Package / Case	2-SMD	—
Size / Dimension	0.287" L x 0.214" W (7.31mm x 5.44mm)	—
Thickness (Max)	0.118	inches (3.00mm)
Type	Polymeric	—
Ratings	AEC-Q200	—
RoHS Status	ROHS3 Compliant	—
Approval Agency	cURus, TUV	—

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following critical parameters:

Voltage rating (15V maximum)
Hold current specification (1.25 A maximum)
Trip current specification (2.5 A)
Maximum current capacity (100 A)
Trip time (2 seconds)
Initial and post-trip resistance values
Operating temperature range (-40°C to 85°C)
Surface mount 2-SMD package configuration
Physical dimensions within tolerance
Polymeric PTC type classification
AEC-Q200 automotive rating
RoHS3 compliance and regulatory approvals

Identified substitutes maintain identical electrical performance characteristics and mechanical compatibility. Packaging format variations (bulk versus tape & reel) do not affect functional equivalence.

Parameter Comparison

Parameter	MF-SM125-2-006 (Main)	MF-SM125-2 (Bourns)	PFSM.125.2 (SCHURTER)
Manufacturer	Bourns Inc.	Bourns Inc.	SCHURTER Inc.
Voltage - Max	15V	15V	15V
Current - Hold (Ih) (Max)	1.25 A	1.25 A	1.25 A
Current - Trip (It)	2.5 A	2.5 A	2.5 A
Current - Max	100 A	100 A	100 A
Time to Trip	2 s	2 s	2 s
Resistance - Initial (Ri) (Min)	70 mOhms	70 mOhms	70 mOhms
Resistance - Post Trip (R1) (Max)	250 mOhms	250 mOhms	250 mOhms
Operating Temperature	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C
Type	Polymeric	Polymeric	Polymeric
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	2-SMD	2-SMD	2-SMD
Size / Dimension	0.287" L x 0.214" W (7.31mm x 5.44mm)	0.287" L x 0.214" W (7.31mm x 5.44mm)	0.289" L x 0.214" W (7.36mm x 5.44mm)
Thickness (Max)	0.118" (3.00mm)	0.118" (3.00mm)	0.118" (3.00mm)
Ratings	AEC-Q200	AEC-Q200	AEC-Q200
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	cURus, TUV	cURus, TUV	cURus, TUV
Product Status	Active	Active	Active
Packaging Format	Bulk	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

Both substitute parts maintain full electrical and mechanical equivalence to the MF-SM125-2-006 across all critical performance parameters. Selection between alternatives is based on the following factors:

MF-SM125-2 (Bourns Inc.): Identical manufacturer and series designation. Packaging format differs (Tape & Reel versus bulk). Recommended for high-volume production environments requiring automated assembly processes. Inventory availability: 5400 units.

PFSM.125.2 (SCHURTER Inc.): Cross-manufacturer equivalent with identical electrical specifications. Physical dimensions show minimal variation (0.289" L versus 0.287" L, within standard PCB layout tolerance). Maintains AEC-Q200 rating and cURus/TUV approvals. Recommended where SCHURTER supply chain integration is preferred. Inventory availability: 2814 units.

All three parts are Active status products with current manufacturing support and full regulatory compliance (ROHS3, REACH Unaffected, EAR99 classification).

Frequently Asked Questions (FAQ)

Q: Can MF-SM125-2 be used as a direct replacement for MF-SM125-2-006?

A: Yes. Both parts are electrically and mechanically identical. The difference is packaging format: MF-SM125-2 is supplied in Tape & Reel format for automated assembly, while MF-SM125-2-006 is bulk packaged. Functional performance is equivalent.

Q: What is the dimensional tolerance between MF-SM125-2-006 and PFSM.125.2?

A: Length dimension differs by 0.002" (0.05mm): MF-SM125-2-006 is 0.287" (7.31mm) and PFSM.125.2 is 0.289" (7.36mm). This variation is within standard PCB layout tolerance and does not affect mechanical fit or electrical performance.

Q: Are all three parts AEC-Q200 rated?

A: Yes. MF-SM125-2-006, MF-SM125-2, and PFSM.125.2 all carry AEC-Q200 automotive-grade qualification and are approved by cURus and TUV.

Q: What is the difference between hold current and trip current?

A: Hold current (Ih) is the maximum continuous current the fuse can sustain without tripping: 1.25 A. Trip current (It) is the threshold at which the fuse activates protection: 2.5 A. Both specifications are identical across all three parts.

Q: Can PFSM.125.2 be substituted in automotive applications?

A: Yes. PFSM.125.2 maintains AEC-Q200 rating and identical electrical specifications. Cross-manufacturer substitution is valid for automotive-grade applications.

Q: What is the moisture sensitivity level for these parts?

A: MF-SM125-2-006 and MF-SM125-2 are MSL 1 (Unlimited). PFSM.125.2 is Not Applicable. All three parts are suitable for standard storage and handling without moisture-sensitive device precautions.

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