Equivalent & Substitute Parts for MF-SM150-2-99

Part Overview

The MF-SM150-2-99 is a polymeric PTC resettable fuse manufactured by Bourns Inc., rated for 15V maximum voltage with 1.5A hold current. This component is classified as obsolete, which necessitates identification of active equivalent and substitute parts for ongoing design support and procurement. The part belongs to the Multifuse® MF-SM series and is designed for surface mount applications in 2-SMD package configuration.

Key Parameters

Parameter	Value
Voltage - Max	15V
Current - Hold (Ih) (Max)	1.5 A
Current - Trip (It)	3 A
Resistance - Initial (Ri) (Min)	60 mOhms
Resistance - Post Trip (R1) (Max)	250 mOhms
Operating Temperature	-40°C ~ 85°C
Time to Trip	5 s
Mounting Type	Surface Mount
Package / Case	2-SMD
Type	Polymeric

Substitute Part Grouping Explanation

Substitution of the MF-SM150-2-99 is determined by the following critical parameters: maximum voltage rating (15V), hold current (1.5A), trip current (3A), initial resistance (60 mOhms minimum), post-trip resistance (250 mOhms maximum), operating temperature range (-40°C to 85°C), and time to trip (5 seconds). The substitute parts are grouped into three categories:

Parametric Equivalents (Same Electrical Characteristics, Different Packaging or Status): MF-SM150-2, MF-SM150-2-006, and PFSM.150.2 maintain identical electrical specifications and are suitable for direct replacement in surface mount applications.

Direct Manufacturer Equivalent (Different Manufacturer, Identical Electrical Specifications): SMD150F-2 from Littelfuse Inc. provides equivalent electrical performance with identical voltage, hold current, trip current, and resistance parameters, though with different physical dimensions and approval agencies.

Similar Parts (Different Current Ratings or Mounting Types): LR4-190F, LR4-260SF, SRP120F, SRP120LF, and SRP120SF represent alternative polymeric PTC fuses with different hold current ratings or strap-based mounting configurations. These are suitable only when circuit requirements permit deviation from the 1.5A hold current specification.

Parameter Comparison

Part Number	Manufacturer	Voltage - Max	Current - Hold (Ih) (Max)	Current - Trip (It)	Resistance - Initial (Ri) (Min)	Resistance - Post Trip (R1) (Max)	Operating Temperature	Mounting Type	Package / Case	Product Status
MF-SM150-2-99	Bourns Inc.	15V	1.5 A	3 A	60 mOhms	250 mOhms	-40°C ~ 85°C	Surface Mount	2-SMD	Obsolete
MF-SM150-2	Bourns Inc.	15V	1.5 A	3 A	60 mOhms	250 mOhms	-40°C ~ 85°C	Surface Mount	2-SMD	Active
MF-SM150-2-006	Bourns Inc.	15V	1.5 A	3 A	60 mOhms	250 mOhms	-40°C ~ 85°C	Surface Mount	2-SMD	Active
SMD150F-2	Littelfuse Inc.	15V	1.5 A	3 A	60 mOhms	250 mOhms	-40°C ~ 85°C	Surface Mount	2-SMD	Active
PFSM.150.2	SCHURTER Inc.	15V	1.5 A	3 A	60 mOhms	250 mOhms	-40°C ~ 85°C	Surface Mount	2-SMD	Active
LR4-190F	Littelfuse Inc.	15V	1.9 A	3.9 A	39 mOhms	102 mOhms	-40°C ~ 85°C	User Defined	Strap	Active
LR4-260SF	Littelfuse Inc.	15V	2.6 A	5.8 A	20 mOhms	63 mOhms	-40°C ~ 85°C	User Defined	Strap	Active
SRP120F	Littelfuse Inc.	15V	1.2 A	2.7 A	85 mOhms	220 mOhms	-40°C ~ 85°C	User Defined	Strap	Active
SRP120LF	Littelfuse Inc.	15V	1.2 A	2.7 A	85 mOhms	220 mOhms	-40°C ~ 85°C	User Defined	Strap	Active
SRP120SF	Littelfuse Inc.	15V	1.2 A	2.7 A	85 mOhms	220 mOhms	-40°C ~ 85°C	User Defined	Strap	Active

Engineering Selection Recommendations

For direct replacement of the obsolete MF-SM150-2-99 in surface mount applications, MF-SM150-2 and MF-SM150-2-006 from Bourns Inc. are the primary choices, both maintaining active product status and identical electrical specifications. MF-SM150-2 is available in Tape & Reel packaging with higher inventory levels (3558 pcs), while MF-SM150-2-006 is available in bulk with lower inventory (699 pcs).

SMD150F-2 from Littelfuse Inc. provides an equivalent alternative with active status and identical electrical parameters. This part carries CSA, TUV, and UL approvals, compared to the cURus and TUV approvals of the Bourns parts. Physical dimensions differ slightly (8.70mm x 6.36mm versus 8.75mm x 6.71mm), requiring PCB layout verification.

PFSM.150.2 from SCHURTER Inc. is a parametric equivalent with active status, AEC-Q200 rating, and identical electrical specifications. This part is available in Tape & Reel packaging with 2599 pcs in stock.

The strap-mounted alternatives (LR4-190F, LR4-260SF, SRP120F, SRP120LF, SRP120SF) are suitable only when circuit design permits different hold current ratings and mounting configurations. These parts are not direct replacements for surface mount applications.

Frequently Asked Questions (FAQ)

Q: Can MF-SM150-2 be used as a direct replacement for MF-SM150-2-99?

A: Yes. MF-SM150-2 maintains identical electrical specifications (15V, 1.5A hold current, 3A trip current, 60 mOhms initial resistance, 250 mOhms post-trip resistance) and surface mount 2-SMD package configuration. The primary difference is product status: MF-SM150-2 is active while MF-SM150-2-99 is obsolete.

Q: What are the physical dimension differences between SMD150F-2 and MF-SM150-2-99?

A: SMD150F-2 measures 8.70mm x 6.36mm, while MF-SM150-2-99 measures 8.75mm x 6.71mm. Both are 3.00mm thick. PCB layout verification is required before substitution.

Q: Are the strap-mounted parts (LR4-190F, LR4-260SF, SRP120F) suitable replacements?

A: No, not for direct replacement. These parts have different mounting types (User Defined Strap versus Surface Mount 2-SMD) and different hold current ratings. They are suitable only when circuit requirements permit these deviations.

Q: What compliance certifications apply to each substitute?

A: MF-SM150-2, MF-SM150-2-006, and PFSM.150.2 carry cURus and TUV approvals with AEC-Q200 rating. SMD150F-2 carries CSA, TUV, and UL approvals. All parts are ROHS3 compliant and REACH unaffected.

Q: Which substitute has the highest inventory availability?

A: SRP120SF has the highest inventory at 45,200 pcs. Among direct surface mount equivalents, SMD150F-2 has 24,660 pcs available. MF-SM150-2 has 3,558 pcs in Tape & Reel packaging.

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