MF-SM200-2-99 Equivalent & Substitute Parts

Part Overview

The MF-SM200-2-99 is a polymeric PTC resettable fuse manufactured by Bourns Inc. in the Multifuse® MF-SM series. This component provides overcurrent protection with a 15V maximum voltage rating and 2A hold current in a 2-SMD surface mount package. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Voltage - Max	15V
Current - Hold (Ih) (Max)	2 A
Current - Trip (It)	4 A
Time to Trip	12 s
Resistance - Initial (Ri) (Min)	45 mOhms
Resistance - Post Trip (R1) (Max)	125 mOhms
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	2-SMD
Type	Polymeric

Substitute Part Grouping Explanation

Substitution for the MF-SM200-2-99 is determined by the following critical parameters: voltage rating (15V maximum), hold current (2A), trip current (4A), time to trip (12 seconds), initial resistance (45 mOhms minimum), post-trip resistance (125 mOhms maximum), operating temperature range (-40°C to 85°C), and mounting configuration.

Substitute parts are grouped into three categories:

Parametric Equivalents (2-SMD Surface Mount): Parts matching all electrical specifications and surface mount package format. These are direct functional replacements with identical performance characteristics.

Direct Manufacturer Alternative (2-SMD Surface Mount): Parts from alternative manufacturers with matching electrical specifications and 2-SMD package, differing only in minor dimensional tolerances or maximum current ratings.

Similar Parts (Strap Configuration): Parts with matching voltage, hold current, and operating temperature but different mounting types (user-defined strap) and package configurations. These require circuit redesign for mechanical integration.

Parameter Comparison

Part Number	Manufacturer	Voltage - Max	Current - Hold (Ih)	Current - Trip (It)	Time to Trip	Ri (Min)	R1 (Max)	Mounting Type	Package	Product Status
MF-SM200-2-99	Bourns Inc.	15V	2 A	4 A	12 s	45 mOhms	125 mOhms	Surface Mount	2-SMD	Obsolete
MF-SM200-2	Bourns Inc.	15V	2 A	4 A	12 s	45 mOhms	125 mOhms	Surface Mount	2-SMD	Active
MF-SM200-2-006	Bourns Inc.	15V	2 A	4 A	12 s	45 mOhms	125 mOhms	Surface Mount	2-SMD	Active
SMD200F-2	Littelfuse Inc.	15V	2 A	4 A	12 s	50 mOhms	125 mOhms	Surface Mount	2-SMD	Active
PFSM.200.2	SCHURTER Inc.	15V	2 A	4 A	12 s	45 mOhms	125 mOhms	Surface Mount	2-SMD	Active
LR4-190F	Littelfuse Inc.	15V	1.9 A	3.9 A	5 s	39 mOhms	102 mOhms	User Defined	Strap	Active
LR4-260SF	Littelfuse Inc.	15V	2.6 A	5.8 A	5 s	20 mOhms	63 mOhms	User Defined	Strap	Active
SRP120F	Littelfuse Inc.	15V	1.2 A	2.7 A	5 s	85 mOhms	220 mOhms	User Defined	Strap	Active
SRP120LF	Littelfuse Inc.	15V	1.2 A	2.7 A	5 s	85 mOhms	220 mOhms	User Defined	Strap	Active
SRP120SF	Littelfuse Inc.	15V	1.2 A	2.7 A	5 s	85 mOhms	220 mOhms	User Defined	Strap	Active

Engineering Selection Recommendations

For Direct Replacement (No Circuit Redesign Required):

MF-SM200-2, MF-SM200-2-006, and PFSM.200.2 are parametric equivalents with active product status. All three maintain identical electrical specifications and 2-SMD surface mount configuration. MF-SM200-2 and PFSM.200.2 carry AEC-Q200 automotive qualification. MF-SM200-2 offers the highest inventory availability (15,200 units).

SMD200F-2 from Littelfuse Inc. is a direct alternative with matching electrical performance in 2-SMD package and active status. Initial resistance is 50 mOhms (5 mOhms higher than the original specification minimum of 45 mOhms), which remains within acceptable tolerance for most applications. This part carries CSA, TUV, and UL approvals.

For Applications Requiring Strap Configuration:

LR4-190F and LR4-260SF are strap-mounted alternatives with 15V voltage rating and active status. LR4-190F matches the original 2A hold current specification closely (1.9A). LR4-260SF provides higher current capacity (2.6A hold current) for applications requiring increased protection margin. Both require mechanical redesign for strap integration.

SRP120F, SRP120LF, and SRP120SF are lower-current strap alternatives (1.2A hold current) suitable only for applications with reduced current requirements. These parts are not suitable as direct replacements for the 2A specification.

Frequently Asked Questions (FAQ)

Q: Can MF-SM200-2 be used as a direct replacement for MF-SM200-2-99?

A: Yes. MF-SM200-2 is a parametric equivalent with identical electrical specifications (15V, 2A hold current, 4A trip current, 12-second trip time) and 2-SMD surface mount package. The primary difference is product status: MF-SM200-2 is active with 15,200 units in stock, while MF-SM200-2-99 is obsolete.

Q: What is the difference between SMD200F-2 and the Bourns equivalents?

A: SMD200F-2 is manufactured by Littelfuse Inc. and carries identical electrical specifications except initial resistance (50 mOhms vs. 45 mOhms minimum). The 5 mOhm difference is within normal manufacturing tolerance. SMD200F-2 is available in Cut Tape and Digi-Reel packaging, while Bourns parts use Tape & Reel. Both are active products with full approvals.

Q: Can strap-mounted parts like LR4-190F replace the 2-SMD surface mount configuration?

A: Electrically, LR4-190F matches the 2A hold current specification. However, strap-mounted parts require different mechanical integration and cannot be used as direct drop-in replacements on PCBs designed for 2-SMD components. Circuit board redesign is necessary.

Q: Why do SRP120 series parts have lower hold current ratings?

A: SRP120F, SRP120LF, and SRP120SF are designed for lower-current applications with 1.2A hold current specification. These parts are not suitable for circuits requiring 2A hold current protection and should not be used as replacements for MF-SM200-2-99.

Q: What compliance certifications should I verify for my application?

A: MF-SM200-2, MF-SM200-2-006, and PFSM.200.2 carry AEC-Q200 automotive qualification. SMD200F-2 carries CSA, TUV, and UL approvals. All parts are ROHS3 compliant and REACH unaffected. Verify that the selected part's certifications match your application requirements.

Q: Are there packaging differences between equivalent parts?

A: Yes. MF-SM200-2 and PFSM.200.2 are supplied in Tape & Reel. MF-SM200-2-006 packaging is not specified. SMD200F-2 is available in Cut Tape and Digi-Reel. Confirm packaging compatibility with your assembly process before selection.

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