MF-SM075-2-99 Polymeric PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The MF-SM075-2-99 is a polymeric PTC resettable fuse manufactured by Bourns Inc. in the Multifuse® MF-SM series. This component is rated for 30V 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 part is currently listed as obsolete, making identification of active equivalent and substitute parts essential for ongoing design support and procurement.

Substiute Parts

MF-SM075-2-99

Bourns Inc.In Stock: 22268MF-SM075-2-99 Datasheet

Current PartRFQ

MF-SM075-2

Bourns Inc.In Stock: 6160MF-SM075-2 Datasheet

Parametric EquivalentRFQ

MF-SM075-2-006

Bourns Inc.In Stock: 1219MF-SM075-2-006 Datasheet

Parametric EquivalentRFQ

PFSM.075.2

SCHURTER Inc.In Stock: 1574PFSM.075.2 Datasheet

DirectRFQ

SMD075F-2

Littelfuse Inc.In Stock: 19504SMD075F-2 Datasheet

DirectRFQ

SMD075F/60-2

LittelfuseIn Stock: 35341SMD075F/60-2 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MF-SM075-2-99 is determined by strict equivalence across the following critical parameters: maximum voltage rating (30V), hold current (750 mA), trip current (1.5 A), time to trip (300 ms), mounting type (Surface Mount), and package configuration (2-SMD). All substitute parts must maintain these electrical and mechanical specifications to ensure functional compatibility within the original circuit design.

The substitute parts are grouped into two categories:

Parametric Equivalents (Bourns Inc.): Parts MF-SM075-2 and MF-SM075-2-006 are direct parametric equivalents from the same manufacturer and series, differing only in product status (active vs. obsolete) and packaging format. These represent the primary replacement path for the obsolete MF-SM075-2-99.

Direct Manufacturer Equivalents (Cross-Manufacturer): Parts PFSM.075.2 (SCHURTER Inc.), SMD075F-2 (Littelfuse Inc.), and SMD075F/60-2 (Littelfuse Inc.) meet the core electrical specifications but originate from different manufacturers. SMD075F/60-2 operates at 60V maximum voltage and therefore does not qualify as a true substitute for 30V-rated applications.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Recommended): MF-SM075-2 and MF-SM075-2-006 are the preferred replacement options for the obsolete MF-SM075-2-99. Both parts are active products from Bourns Inc. within the same Multifuse® MF-SM series, maintaining identical electrical and mechanical specifications. MF-SM075-2 offers the advantage of higher inventory availability (6100 pcs) and standard Cut Tape and Digi-Reel® packaging options. MF-SM075-2-006 is also active with 1133 pcs in stock.

Cross-Manufacturer Alternatives: PFSM.075.2 (SCHURTER Inc.) and SMD075F-2 (Littelfuse Inc.) are functionally equivalent for 30V applications. PFSM.075.2 maintains the 230 mOhms initial resistance specification and carries cURus and TUV approvals. SMD075F-2 features higher initial resistance (350 mOhms) and broader approval agency coverage (CSA, TUV, UL), with substantial inventory (19408 pcs).

Not Recommended: SMD075F/60-2 operates at 60V maximum voltage and does not qualify as a substitute for 30V-rated circuit applications, despite matching other electrical parameters.

Frequently Asked Questions (FAQ)

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

A: Yes. MF-SM075-2 is a parametric equivalent with identical voltage, current, and thermal specifications. The primary difference is product status (active vs. obsolete) and packaging format. Both parts are from Bourns Inc. and the Multifuse® MF-SM series.

Q: What is the difference between MF-SM075-2 and MF-SM075-2-006?

A: Both are active Bourns products with identical electrical specifications. MF-SM075-2-006 includes a manufacturing date code suffix. MF-SM075-2 offers higher inventory availability and standard packaging options (Cut Tape and Digi-Reel®).

Q: Can I use SMD075F-2 (Littelfuse) instead of the Bourns part?

A: SMD075F-2 meets the core electrical requirements (30V, 750 mA hold, 1.5 A trip, 300 ms trip time) and is mechanically compatible in 2-SMD package. However, it specifies 350 mOhms initial resistance versus 230 mOhms for the original part. This higher resistance may affect circuit performance in applications sensitive to voltage drop. Littelfuse SMD075F-2 carries CSA, TUV, and UL approvals.

Q: Why is SMD075F/60-2 listed but not recommended?

A: SMD075F/60-2 is rated for 60V maximum voltage, exceeding the 30V specification of the original circuit. Using a higher-voltage-rated component in a 30V application is not a substitute relationship and may introduce unnecessary cost and size considerations.

Q: What packaging options are available for active substitutes?

A: MF-SM075-2 is available in Cut Tape (CT) and Digi-Reel® formats. MF-SM075-2-006 packaging is not specified. PFSM.075.2 is supplied in Tape & Reel (TR). SMD075F-2 and SMD075F/60-2 are available in Cut Tape (CT) and Digi-Reel® formats.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (MF-SM075-2, MF-SM075-2-006, PFSM.075.2, SMD075F-2, and SMD075F/60-2) are ROHS3 compliant and REACH unaffected.

Q: What are the physical dimensions of the 2-SMD package?

A: The original MF-SM075-2-99 measures 0.287" L × 0.214" W (7.31mm × 5.44mm) with maximum thickness of 0.125" (3.18mm). PFSM.075.2 is slightly larger at 0.289" L × 0.214" W (7.36mm × 5.44mm). Littelfuse parts (SMD075F-2 and SMD075F/60-2) measure 0.290" L × 0.202" W (7.36mm × 5.12mm). All maintain the same 0.125" (3.18mm) maximum thickness and are mechanically compatible in standard 2-SMD footprints.