MF-SM030-2-99 Equivalent & Substitute Parts

Part Overview

The MF-SM030-2-99 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 300 mA hold current and 600 mA trip current, 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 production continuity.

Key Parameters

Parameter	Value
Voltage - Max	60V
Current - Hold (Ih) (Max)	300 mA
Current - Trip (It)	600 mA
Time to Trip	3 s
Resistance - Initial (Ri) (Min)	900 mOhms
Resistance - Post Trip (R1) (Max)	4.8 Ohms
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	2-SMD
Type	Polymeric

Substitute Part Grouping Explanation

Substitution eligibility for the MF-SM030-2-99 is determined by strict equivalence across the following critical parameters:

Voltage rating: 60V maximum
Hold current (Ih): 300 mA maximum
Trip current (It): 600 mA
Time to trip: 3 seconds
Post-trip resistance (R1): 4.8 Ohms maximum
Operating temperature range: -40°C to 85°C
Package type: 2-SMD surface mount
Component type: Polymeric PTC resettable fuse

Three substitute parts meet these criteria and are grouped as follows:

Direct Manufacturer Equivalent (MF-SM030-2): Same manufacturer (Bourns Inc.), identical electrical specifications, and active product status with higher inventory availability.

Cross-Manufacturer Equivalent (SMD030F-2): Littelfuse Inc. PolySwitch® series component with matching voltage, hold current, trip current, and trip time specifications.

Parametric Equivalent (PFSM.030.2): SCHURTER Inc. component with full parameter alignment including initial resistance and post-trip resistance specifications.

Parameter Comparison

Parameter	MF-SM030-2-99 (Main)	MF-SM030-2	SMD030F-2	PFSM.030.2
Manufacturer	Bourns Inc.	Bourns Inc.	Littelfuse Inc.	SCHURTER Inc.
Voltage - Max	60V	60V	60V	60V
Current - Hold (Ih) (Max)	300 mA	300 mA	300 mA	300 mA
Current - Trip (It)	600 mA	600 mA	600 mA	600 mA
Time to Trip	3 s	3 s	3 s	3 s
Resistance - Initial (Ri) (Min)	900 mOhms	900 mOhms	1.2 Ohms	900 mOhms
Resistance - Post Trip (R1) (Max)	4.8 Ohms	4.8 Ohms	4.8 Ohms	4.8 Ohms
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Product Status	Obsolete	Active	Active	Active
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	2-SMD	2-SMD	2-SMD	2-SMD
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

MF-SM030-2 (Bourns Inc.): Recommended as the primary substitute. This part is manufactured by the same supplier as the obsolete MF-SM030-2-99, maintains identical electrical and mechanical specifications, and carries Active product status. Higher inventory availability (11,100 pcs) supports production continuity. Packaging options include Cut Tape and Digi-Reel formats. AEC-Q200 rating and cURus/TUV approvals are maintained.

SMD030F-2 (Littelfuse Inc.): Suitable as a secondary substitute with cross-manufacturer compatibility. All critical electrical parameters match the original specification. Initial resistance differs at 1.2 Ohms versus 900 mOhms, which does not affect functional equivalence within the specified operating parameters. Highest inventory availability (34,177 pcs) ensures supply security. Moisture Sensitivity Level is 2A (4 weeks) compared to MSL 1 for other options. Approvals include CSA, TUV, and UL.

PFSM.030.2 (SCHURTER Inc.): Acceptable as a tertiary substitute with complete parameter alignment including initial resistance specification. Active product status and AEC-Q200 rating provide design confidence. Tape & Reel packaging format is available. Lower inventory (1,300 pcs) may require longer lead times.

Frequently Asked Questions (FAQ)

Q: Can MF-SM030-2 be used as a direct replacement for MF-SM030-2-99?

A: Yes. MF-SM030-2 is manufactured by Bourns Inc. with identical electrical specifications, operating temperature range, and 2-SMD package configuration. The primary difference is product status: MF-SM030-2 is Active while MF-SM030-2-99 is Obsolete. All functional parameters required for circuit operation are equivalent.

Q: What is the significance of the initial resistance difference in SMD030F-2?

A: SMD030F-2 has an initial resistance of 1.2 Ohms compared to 900 mOhms in the main part. Both components meet the 4.8 Ohms maximum post-trip resistance specification and share identical voltage, hold current, trip current, and trip time parameters. The initial resistance difference does not affect substitution eligibility for applications within the specified electrical operating range.

Q: Are all three substitute parts suitable for AEC-Q200 applications?

A: MF-SM030-2 and PFSM.030.2 both carry AEC-Q200 ratings. SMD030F-2 does not list AEC-Q200 certification in the provided specifications. For automotive or AEC-Q200-mandated applications, MF-SM030-2 or PFSM.030.2 are the appropriate selections.

Q: What packaging formats are available for each substitute?

A: MF-SM030-2 is available in Cut Tape (CT) and Digi-Reel® formats. SMD030F-2 is available in Cut Tape (CT) and Digi-Reel® formats. PFSM.030.2 is available in Tape & Reel (TR) format. Packaging selection should align with production assembly requirements and inventory management practices.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. MF-SM030-2, SMD030F-2, and PFSM.030.2 are all ROHS3 Compliant and REACH Unaffected, matching the compliance status of the original MF-SM030-2-99 component.

Q: What is the moisture sensitivity level for each part?

A: MF-SM030-2 and PFSM.030.2 have MSL 1 (Unlimited). SMD030F-2 has MSL 2A (4 Weeks). MSL 1 components have no moisture sensitivity restrictions, while MSL 2A components require controlled storage conditions with a 4-week floor life after bag opening.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message