S1MFL General Purpose Rectifier Diode Equivalent & Substitute Parts

Part Overview

The S1MFL is a general purpose rectifier diode manufactured by onsemi, rated for 1000 V DC reverse voltage and 1 A average rectified current in a surface mount SOD-123F package. This component is classified as "Not For New Designs," indicating it has been superseded in onsemi's product portfolio. Identifying equivalent and substitute parts is necessary for applications requiring continued sourcing, legacy system maintenance, or design flexibility when the primary part becomes unavailable.

Substiute Parts

S1MFL

onsemiIn Stock: 292284S1MFL Datasheet

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FSM17PL-TP

Micro Commercial CoIn Stock: 10634FSM17PL-TP Datasheet

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S07M-GS08

Vishay General Semiconductor - Diodes DivisionIn Stock: 305311S07M-GS08 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the S1MFL is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

• Voltage - DC Reverse (Vr) (Max): Must equal or exceed 1000 V
• Current - Average Rectified (Io): Must equal or exceed 1 A
• Mounting Type: Surface Mount
• Technology: Standard recovery rectifier

Secondary Compatibility Factors:

• Forward voltage (Vf) characteristics
• Reverse recovery time (trr)
• Reverse leakage current
• Operating temperature range
• Package form factor and footprint compatibility
• RoHS and regulatory compliance status

Substitute parts are grouped based on whether they meet the minimum electrical ratings while maintaining surface mount compatibility. Package variations (SOD-123F versus DO-219AB) represent different physical footprints but equivalent electrical performance within the specified parameter ranges.

Parameter Comparison

Engineering Selection Recommendations

FSM17PL-TP (Micro Commercial Co): This substitute maintains identical voltage and current ratings with the same SOD-123F package footprint, enabling direct board-level replacement. The part is in Active product status, ensuring long-term availability. Forward voltage is slightly elevated at 1.3 V compared to 1.1 V, which may increase power dissipation in high-frequency switching applications. Reverse recovery time is significantly faster at 500 ns, providing improved switching performance. Operating temperature range is extended to -65°C minimum. ROHS3 compliance and unlimited moisture sensitivity level match the original specification.

S07M-GS08 (Vishay): This substitute exceeds the current rating at 1.5 A, providing design margin for applications requiring higher current capacity. The part uses a DO-219AB package, which differs physically from the SOD-123F but maintains surface mount compatibility. Forward voltage and reverse recovery time characteristics closely match the original part. The substitute is in Active product status with ROHS3 compliance. Operating temperature maximum is reduced to 150°C compared to 175°C. Package substitution requires PCB layout verification to confirm footprint compatibility.

Both substitutes maintain the 1000 V reverse voltage rating and standard recovery technology. Selection between FSM17PL-TP and S07M-GS08 depends on package footprint requirements and current capacity needs within the application circuit.

Frequently Asked Questions (FAQ)

Q: Can FSM17PL-TP be used as a direct replacement for S1MFL on the same PCB?

A: Yes. Both parts use the SOD-123F package with identical footprints. No PCB layout modifications are required. However, the higher forward voltage (1.3 V versus 1.1 V) will increase power dissipation by approximately 18% at rated current, which may affect thermal design in high-frequency applications.

Q: What is the primary difference between FSM17PL-TP and S07M-GS08?

A: The FSM17PL-TP maintains the SOD-123F package for direct PCB compatibility, while the S07M-GS08 uses a larger DO-219AB package but provides higher current capacity (1.5 A versus 1 A). Package selection depends on available board space and current requirements.

Q: Are both substitute parts compliant with RoHS3 requirements?

A: Yes. Both FSM17PL-TP and S07M-GS08 are ROHS3 compliant, matching the original S1MFL specification.

Q: Does the faster reverse recovery time of FSM17PL-TP (500 ns) affect circuit performance?

A: Faster reverse recovery time reduces switching losses and improves efficiency in rectification circuits. This is a performance enhancement compared to the original 2 µs specification and does not create compatibility issues.

Q: What is the impact of the reduced maximum operating temperature on S07M-GS08?

A: The S07M-GS08 maximum junction temperature is 150°C compared to 175°C for the original part. Applications operating near the upper temperature limit require thermal analysis to confirm the substitute remains within safe operating margins.

Q: Can S07M-GS08 be used in applications rated for 1 A if it is rated for 1.5 A?

A: Yes. The 1.5 A rating indicates maximum capacity. Operating at 1 A is well within the part's specifications and provides design margin. No circuit modifications are required.

Q: Are there packaging differences between the substitute parts that affect handling or assembly?

A: Both parts have unlimited moisture sensitivity level (MSL 1), requiring no special storage or handling precautions. FSM17PL-TP is supplied in Tape & Reel format, while S07M-GS08 is also supplied in Tape & Reel format. Standard surface mount assembly processes apply to both.