Equivalent & Substitute Parts for MF-SM075/60-2-99

Part Overview

The MF-SM075/60-2-99 is a Polymeric PTC Resettable Fuse manufactured by Bourns Inc. in the Multifuse® MF-SM series. This component is rated for 60V maximum voltage with a 750 mA hold current and 1.5 A trip current, designed for surface mount applications in 2-SMD package configuration. The product is currently listed as Obsolete, making identification of equivalent and substitute parts essential for ongoing design support and procurement.

Key Parameters

Parameter	Value
Voltage - Max	60V
Current - Hold (Ih) (Max)	750 mA
Current - Trip (It)	1.5 A
Current - Max	10 A
Time to Trip	300 ms
Resistance - Initial (Ri) (Min)	230 mOhms
Resistance - Post Trip (R1) (Max)	1 Ohms
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)	0.125" (3.18mm)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the MF-SM075/60-2-99 is determined by strict equivalence across the following critical parameters:

Voltage rating: 60V maximum
Hold current: 750 mA
Trip current: 1.5 A
Package type: 2-SMD surface mount
Physical dimensions: 0.287" L x 0.214" W (7.31mm x 5.44mm)
Operating temperature range: -40°C ~ 85°C
RoHS3 compliance

Two substitute parts meet these criteria: the MF-SM075/60-2 from Bourns Inc. (parametric equivalent with different packaging) and the SMD075F/60-2 from Littelfuse (similar manufacturer part with minor parameter variations within acceptable tolerance).

Parameter Comparison

Parameter	MF-SM075/60-2-99 (Main)	MF-SM075/60-2 (Parametric Equivalent)	SMD075F/60-2 (Similar)
Manufacturer	Bourns Inc.	Bourns Inc.	Littelfuse
Series	Multifuse® MF-SM	Multifuse® MF-SM	PolySwitch® SMD
Product Status	Obsolete	Active	Active
Voltage - Max	60V	60V	60V
Current - Hold (Ih) (Max)	750 mA	750 mA	750 mA
Current - Trip (It)	1.5 A	1.5 A	1.5 A
Current - Max	10 A	10 A	10 A
Time to Trip	300 ms	300 ms	300 ms
Resistance - Initial (Ri) (Min)	230 mOhms	230 mOhms	350 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)	0.125" (3.18mm)	0.125" (3.18mm)	0.125" (3.18mm)
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	Not specified

Engineering Selection Recommendations

For applications currently using the obsolete MF-SM075/60-2-99, the MF-SM075/60-2 from Bourns Inc. is the primary substitute. This part maintains identical electrical and mechanical specifications while offering Active product status and improved availability. Both parts carry cURus and TUV approvals and are ROHS3 compliant.

The SMD075F/60-2 from Littelfuse is a secondary alternative that meets all critical electrical parameters. However, this part exhibits a higher initial resistance (350 mOhms versus 230 mOhms) and a higher moisture sensitivity level (MSL 2A versus MSL 1). Physical dimensions show minor variations (0.290" L x 0.202" W versus 0.287" L x 0.214" W), which may require PCB layout verification. Approval agency information is not specified for this part.

Frequently Asked Questions (FAQ)

Q: Can the MF-SM075/60-2 directly replace the MF-SM075/60-2-99?

A: Yes. The MF-SM075/60-2 is a parametric equivalent with identical electrical ratings, operating temperature range, and physical dimensions. The primary difference is packaging format (Tape & Reel versus the original specification) and Active product status.

Q: What is the difference between the Bourns and Littelfuse substitutes?

A: Both parts share the same voltage, hold current, trip current, and time-to-trip specifications. The SMD075F/60-2 has a higher initial resistance (350 mOhms versus 230 mOhms), higher moisture sensitivity (MSL 2A versus MSL 1), and slightly different physical dimensions. These differences may affect circuit performance in applications with tight tolerance requirements.

Q: Are there packaging considerations when switching to the MF-SM075/60-2?

A: The MF-SM075/60-2 is supplied in Tape & Reel format, whereas the original part number may have different packaging. Verify your procurement and assembly processes support this packaging format.

Q: Does the SMD075F/60-2 require special handling due to its MSL rating?

A: The SMD075F/60-2 carries an MSL 2A rating, requiring storage in controlled humidity conditions for up to 4 weeks. The original part and the Bourns substitute (MSL 1) have unlimited shelf life under standard conditions. Confirm your storage and handling procedures can accommodate this requirement.

Q: Are all three parts RoHS3 compliant?

A: Yes. The MF-SM075/60-2-99, MF-SM075/60-2, and SMD075F/60-2 are all ROHS3 compliant and REACH unaffected.

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