Equivalent & Substitute Parts for MF-SM260-2-99

Part Overview

The MF-SM260-2-99 is a Polymeric PTC Resettable Fuse manufactured by Bourns Inc. in the Multifuse® MF-SM series. This component is rated for 6V maximum voltage with a 2.6A hold current and is designed for surface mount applications in 2-SMD package configuration. The part is currently listed as obsolete, making identification of equivalent and substitute components essential for ongoing design support and procurement.

Key Parameters

Parameter	Value
Voltage - Max	6V
Current - Hold (Ih) (Max)	2.6 A
Current - Trip (It)	5.2 A
Time to Trip	20 s
Resistance - Initial (Ri) (Min)	25 mOhms
Resistance - Post Trip (R1) (Max)	75 mOhms
Operating Temperature	-40°C ~ 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" (3.00mm)
Type	Polymeric
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for PTC resettable fuses is determined by strict alignment of electrical and mechanical parameters. The following criteria establish valid substitutes for the MF-SM260-2-99:

Critical Matching Parameters:

Voltage - Max: 6V
Current - Hold (Ih) (Max): 2.6 A
Current - Trip (It): 5.2 A
Time to Trip: 20 s
Resistance - Initial (Ri) (Min): 25 mOhms
Resistance - Post Trip (R1) (Max): 75 mOhms
Operating Temperature: -40°C ~ 85°C
Mounting Type: Surface Mount
Package / Case: 2-SMD

Acceptable Variations:

Physical dimensions within manufacturing tolerances
Moisture Sensitivity Level (MSL) rating equal to or lower (more stringent)
Approval agencies and certifications may differ while maintaining equivalent functional performance

Parameter Comparison

Parameter	MF-SM260-2-99 (Main)	MF-SM260-2 (Parametric Equivalent)	SMD260F-2 (Direct Manufacturer)
Manufacturer	Bourns Inc.	Bourns Inc.	Littelfuse Inc.
Series	Multifuse®, MF-SM	Multifuse®, MF-SM	PolySwitch®, SMD
Product Status	Obsolete	Active	Active
Voltage - Max	6V	6V	6V
Current - Hold (Ih) (Max)	2.6 A	2.6 A	2.6 A
Current - Trip (It)	5.2 A	5.2 A	5.2 A
Current - Max	100 A	100 A	40 A
Time to Trip	20 s	20 s	20 s
Resistance - Initial (Ri) (Min)	25 mOhms	25 mOhms	25 mOhms
Resistance - Post Trip (R1) (Max)	75 mOhms	75 mOhms	75 mOhms
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
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)	0.290" L x 0.202" W (7.36mm x 5.12mm)
Thickness (Max)	0.118" (3.00mm)	0.118" (3.00mm)	0.118" (3.00mm)
Type	Polymeric	Polymeric	Polymeric
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	2A (4 Weeks)
Approval Agency	cURus, TUV	cURus, TUV	CSA, TUV, UL

Engineering Selection Recommendations

MF-SM260-2 (Bourns Inc.): This part is the direct parametric equivalent to the obsolete MF-SM260-2-99, maintaining identical electrical specifications and physical dimensions. Both parts are manufactured by Bourns Inc. within the same Multifuse® MF-SM series. The MF-SM260-2 carries Active product status with higher inventory availability (3050 Pcs) and is supplied in Tape & Reel packaging. This part is the primary recommendation for direct replacement in designs currently using the MF-SM260-2-99.

SMD260F-2 (Littelfuse Inc.): This part meets all critical electrical parameters and operating temperature requirements. The SMD260F-2 is manufactured by Littelfuse Inc. in the PolySwitch® SMD series and carries Active product status. Physical dimensions are within acceptable manufacturing tolerances (7.36mm x 5.12mm versus 7.31mm x 5.44mm). The Moisture Sensitivity Level is rated at 2A (4 Weeks) compared to MSL 1 (Unlimited) for the main part, requiring appropriate handling during storage and assembly. Approval agencies include CSA, TUV, and UL. This part is suitable for applications where cross-manufacturer sourcing is acceptable.

Frequently Asked Questions (FAQ)

Q: Can MF-SM260-2 be used as a direct replacement for MF-SM260-2-99?

A: Yes. The MF-SM260-2 is a parametric equivalent with identical electrical specifications, operating temperature range, and physical dimensions. Both are Bourns Inc. Multifuse® components with the same 6V/2.6A rating and 2-SMD package configuration.

Q: What are the key differences between the Bourns MF-SM260-2 and Littelfuse SMD260F-2?

A: Both parts match on all critical electrical parameters: 6V maximum voltage, 2.6A hold current, 5.2A trip current, and 20-second trip time. Physical dimensions are within manufacturing tolerances. The primary differences are manufacturer (Bourns versus Littelfuse), series designation (Multifuse® versus PolySwitch®), and Moisture Sensitivity Level (MSL 1 versus MSL 2A). The SMD260F-2 has a lower maximum current rating (40A versus 100A), which does not affect substitution eligibility for this 2.6A hold current application.

Q: Are there any handling considerations when using SMD260F-2?

A: The SMD260F-2 has an MSL rating of 2A (4 Weeks), compared to MSL 1 (Unlimited) for the MF-SM260-2. This requires adherence to moisture control procedures during storage and assembly. Components must be stored in dry conditions and used within the specified timeframe after packaging is opened.

Q: Do all substitute parts have the same package dimensions?

A: Physical dimensions are within acceptable manufacturing tolerances. The MF-SM260-2 matches the original at 7.31mm x 5.44mm. The SMD260F-2 measures 7.36mm x 5.12mm, representing minor variations that remain compatible with standard 2-SMD footprints. All parts maintain the same 3.00mm maximum thickness.

Q: Which certifications apply to each substitute part?

A: MF-SM260-2 carries cURus and TUV approvals. SMD260F-2 carries CSA, TUV, and UL approvals. Both parts are ROHS3 Compliant and EAR99 classified.

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