Equivalent & Substitute Parts for MF-SM100-2-99

Part Overview

The MF-SM100-2-99 is a polymeric PTC resettable fuse manufactured by Bourns Inc., rated for 30V maximum voltage with a 1.1A hold current. This component is classified as obsolete, making identification of active equivalent parts essential for ongoing design support and procurement. Polymeric PTC resettable fuses function as automatic circuit protection devices, resetting after fault conditions are cleared. Locating functionally equivalent alternatives ensures design continuity and supply chain reliability.

Key Parameters

Parameter	Value
Voltage - Max	30V
Current - Hold (Ih) (Max)	1.1 A
Current - Trip (It)	2.2 A
Time to Trip	500 ms
Resistance - Initial (Ri) (Min)	120 mOhms
Resistance - Post Trip (R1) (Max)	480 mOhms
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-SM100-2-99 is determined by strict equivalence across the following critical parameters: maximum voltage rating (30V), hold current (1.1A maximum), trip current (2.2A), time to trip (500 ms), initial resistance (120 mOhms minimum), post-trip resistance (480 mOhms maximum), operating temperature range (-40°C to 85°C), polymeric type classification, and 2-SMD surface mount package. All identified substitutes meet these core electrical and mechanical specifications. Packaging format variations (Cut Tape, Digi-Reel, Tape & Reel) do not affect functional equivalence but may influence procurement and assembly workflows.

Parameter Comparison

Parameter	MF-SM100-2-99 (Bourns)	MF-SM100-2 (Bourns)	PFSM.100.2 (SCHURTER)	SMD100F-2 (Littelfuse)
Manufacturer	Bourns Inc.	Bourns Inc.	SCHURTER Inc.	Littelfuse Inc.
Product Status	Obsolete	Active	Active	Active
Voltage - Max	30V	30V	30V	30V
Current - Hold (Ih) (Max)	1.1 A	1.1 A	1.1 A	1.1 A
Current - Trip (It)	2.2 A	2.2 A	2.2 A	2.2 A
Time to Trip	500 ms	500 ms	500 ms	500 ms
Resistance - Initial (Ri) (Min)	120 mOhms	120 mOhms	120 mOhms	120 mOhms
Resistance - Post Trip (R1) (Max)	480 mOhms	480 mOhms	480 mOhms	480 mOhms
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	2-SMD	2-SMD	2-SMD	2-SMD
Type	Polymeric	Polymeric	Polymeric	Polymeric
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	cURus, TUV	cURus, TUV	cURus, TUV	CSA, TUV, UL

Engineering Selection Recommendations

MF-SM100-2 (Bourns Inc.) is the primary parametric equivalent, sharing identical electrical specifications and certifications with the obsolete MF-SM100-2-99. This part maintains active product status and is available in standard packaging formats (Cut Tape and Digi-Reel), ensuring supply continuity.

PFSM.100.2 (SCHURTER Inc.) provides full electrical equivalence with active product status. Physical dimensions show minimal variation (7.36mm length versus 7.31mm), remaining within acceptable tolerances for 2-SMD footprints. Tape & Reel packaging is suitable for high-volume production environments.

SMD100F-2 (Littelfuse Inc.) meets all core electrical parameters with active product status. This part carries expanded regulatory approvals (CSA, TUV, UL) compared to the original specification. Physical dimensions (7.36mm x 5.12mm) remain compatible with 2-SMD mounting. Moisture sensitivity level is rated 2A (4 weeks) versus the original unlimited rating, requiring standard moisture control during storage and assembly.

All three substitutes comply with ROHS3 and REACH requirements, matching the original part's environmental compliance profile.

Frequently Asked Questions (FAQ)

Q: Can MF-SM100-2 directly replace MF-SM100-2-99 in existing designs?

A: Yes. MF-SM100-2 is parametrically identical to MF-SM100-2-99 across all critical electrical specifications: 30V maximum voltage, 1.1A hold current, 2.2A trip current, 500ms trip time, and identical resistance characteristics. Both use 2-SMD surface mount packaging. The primary difference is product status (active versus obsolete) and packaging format options.

Q: What are the physical compatibility considerations for PFSM.100.2?

A: PFSM.100.2 dimensions are 7.36mm length x 5.44mm width x 3.00mm thickness, compared to MF-SM100-2-99 at 7.31mm x 5.44mm x 3.00mm. The 0.05mm length difference is negligible for 2-SMD footprint compatibility. Both parts use identical 2-SMD package geometry.

Q: Does SMD100F-2 require different handling procedures?

A: SMD100F-2 has moisture sensitivity level 2A (4 weeks), whereas MF-SM100-2-99 is rated unlimited. Standard moisture control practices during storage and assembly are required. This does not affect electrical performance or circuit functionality.

Q: Are all substitutes certified for automotive applications?

A: MF-SM100-2 and PFSM.100.2 carry AEC-Q200 ratings. SMD100F-2 does not list AEC-Q200 certification but carries CSA, TUV, and UL approvals. Automotive application requirements should be verified against specific design standards.

Q: What packaging formats are available for each substitute?

A: MF-SM100-2 is available in Cut Tape (CT) and Digi-Reel formats. PFSM.100.2 is supplied in Tape & Reel (TR). SMD100F-2 is available in Cut Tape (CT) and Digi-Reel formats. Selection depends on procurement volume and assembly line requirements.

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