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STS7PF30L P-Channel MOSFET Equivalent & Substitute Parts
Part Overview
The STS7PF30L is a P-Channel MOSFET manufactured by STMicroelectronics, rated for 30V drain-to-source voltage and 7A continuous drain current in an 8-SOIC surface mount package. This device is part of the STripFET™ II series and is classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active manufacturers are necessary for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility within the specified parameter ranges while offering active product status and continued availability.
Substiute Parts
Key Parameters
| Parameter | STS7PF30L Value | Unit |
|---|---|---|
| FET Type | P-Channel | — |
| Drain to Source Voltage (Vdss) | 30 | V |
| Continuous Drain Current (Id) @ 25°C | 7 | A |
| Rds On (Max) @ Id, Vgs | 21 mOhm @ 3.5A, 10V | mOhm |
| Vgs(th) (Max) @ Id | 2.5 @ 250µA | V |
| Gate Charge (Qg) (Max) @ Vgs | 38 @ 4.5V | nC |
| Power Dissipation (Max) | 2.5 | W |
| Operating Temperature (TJ) | 150 | °C |
| Mounting Type | Surface Mount | — |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitute parts for the STS7PF30L are selected based on strict electrical and mechanical compatibility criteria. All substitute candidates must satisfy the following requirements:
Mandatory Matching Parameters:
- FET Type: P-Channel
- Drain to Source Voltage (Vdss): 30V minimum
- Package / Case: 8-SOIC or equivalent 8-pin surface mount package
- Mounting Type: Surface Mount
- RoHS Status: ROHS3 Compliant
- Moisture Sensitivity Level: 1 (Unlimited)
Electrical Performance Criteria:
- Continuous Drain Current (Id) @ 25°C: Equal to or greater than 7A
- Rds On (Max): Equal to or less than 21 mOhm (at comparable test conditions)
- Vgs(th) (Max): Within ±0.5V of 2.5V threshold
- Gate Charge (Qg): Comparable to 38 nC specification
- Power Dissipation (Max): Equal to or greater than 2.5W
- Operating Temperature: 150°C or higher
Substitute parts are grouped into two categories: Direct Substitutes (meeting all parameters within tight tolerances) and Similar Substitutes (meeting core electrical requirements with minor parameter variations). All listed parts are from active manufacturers with current product status or are documented as compatible alternatives.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Vdss (V) | Id @ 25°C (A) | Rds On Max (mOhm) | Vgs(th) Max (V) | Qg Max (nC) | Power Diss Max (W) | Package | Product Status |
|---|---|---|---|---|---|---|---|---|---|
| STS7PF30L | STMicroelectronics | 30 | 7 | 21 | 2.5 | 38 | 2.5 | 8-SOIC | Obsolete |
| SI4431CDY-T1-E3 | Vishay Siliconix | 30 | 9 | 32 | 2.5 | 38 | 4.2 | 8-SOIC | Active |
| AO4411 | Alpha & Omega Semiconductor | 30 | 8 | 32 | 2.4 | 16 | 3.1 | 8-SOIC | Not For New Designs |
| AO4419 | Alpha & Omega Semiconductor | 30 | 9.7 | 20 | 2.7 | 32 | 3.1 | 8-SOIC | Active |
| DMP3036SSS-13 | Diodes Incorporated | 30 | 19.5 | 20 | 3.0 | 16.5 | 1.4 | 8-SO | Active |
| FDS4435BZ | onsemi | 30 | 8.8 | 20 | 3.0 | 40 | 2.5 | 8-SOIC | Active |
| FDS6675BZ | onsemi | 30 | 11 | 13 | 3.0 | 62 | 2.5 | 8-SOIC | Active |
| IRF7240TRPBF | Infineon Technologies | 40 | 10.5 | 15 | 3.0 | 110 | 2.5 | 8-SO | Active |
| IRF7416TRPBF | Infineon Technologies | 30 | 10 | 20 | 1.0 | 92 | 2.5 | 8-SO | Active |
| IRF7424TRPBF | Infineon Technologies | 30 | 11 | 13.5 | 2.5 | 110 | 2.5 | 8-SO | Active |
| RS3E075ATTB | Rohm Semiconductor | 30 | — | 23.5 | 2.5 | 25 | 2.0 | 8-SOP-J | Not For New Designs |
Engineering Selection Recommendations
Direct Substitute (Preferred for New Designs):
The SI4431CDY-T1-E3 from Vishay Siliconix is the primary direct substitute for the STS7PF30L. This part maintains 30V Vdss rating, exceeds the 7A continuous drain current requirement at 9A, and is classified as Active product status. The SI4431CDY-T1-E3 is ROHS3 compliant, MSL 1 rated, and packaged in 8-SOIC format identical to the original part. Higher power dissipation (4.2W vs. 2.5W) provides improved thermal performance. Gate charge specification remains equivalent at 38 nC.
Active Product Alternatives:
The IRF7416TRPBF and IRF7424TRPBF from Infineon Technologies (HEXFET® series) are active products meeting or exceeding all electrical requirements. Both devices maintain 30V Vdss, provide 10A and 11A continuous drain current respectively, and deliver 2.5W power dissipation. These parts are ROHS3 compliant and MSL 1 rated. Package format is 8-SO, which is mechanically compatible with 8-SOIC footprints.
The FDS4435BZ and FDS6675BZ from onsemi (PowerTrench® series) are active products with 30V Vdss ratings. FDS4435BZ provides 8.8A at 20 mOhm Rds On, while FDS6675BZ delivers 11A at 13 mOhm Rds On. Both maintain 2.5W power dissipation and are ROHS3 compliant with MSL 1 rating in 8-SOIC packages.
The AO4419 from Alpha & Omega Semiconductor is an active product rated for 30V, 9.7A continuous drain current, with 20 mOhm Rds On and 3.1W power dissipation. ROHS3 compliance and MSL 1 rating are confirmed.
Parts Not Recommended for New Designs:
The AO4411 and RS3E075ATTB are classified as "Not For New Designs" and should not be selected for new product development. These parts may be used only for legacy system maintenance or repair applications where original part compatibility is required.
Voltage Rating Consideration:
The IRF7240TRPBF features a 40V Vdss rating, which exceeds the 30V requirement of the STS7PF30L. This part is suitable for applications requiring higher voltage margin but is not necessary for circuits designed to the 30V specification.
Frequently Asked Questions (FAQ)
Q: Can the SI4431CDY-T1-E3 be used as a direct replacement for the STS7PF30L?
A: Yes. The SI4431CDY-T1-E3 maintains identical 30V Vdss rating, exceeds the 7A continuous drain current requirement, and is packaged in the same 8-SOIC format. Both parts are ROHS3 compliant with MSL 1 rating. The SI4431CDY-T1-E3 is classified as Active product status, making it suitable for new designs.
Q: What is the difference between 8-SOIC and 8-SO packages?
A: Both 8-SOIC and 8-SO are 8-pin surface mount packages with 0.154" (3.90mm) width. These packages are mechanically and electrically compatible for PCB footprint purposes. Parts specified as 8-SO can be used in 8-SOIC footprints without modification.
Q: Why do some substitute parts have higher Rds On values than the STS7PF30L?
A: Rds On (on-state resistance) varies based on the specific test conditions (drain current and gate-source voltage at which it is measured). The SI4431CDY-T1-E3 specifies 32 mOhm at 7A and 10V, compared to the STS7PF30L at 21 mOhm at 3.5A and 10V. Higher current testing conditions typically result in higher measured Rds On values. For applications requiring lower on-state resistance, parts such as FDS6675BZ (13 mOhm) or IRF7424TRPBF (13.5 mOhm) are available.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All substitute parts listed in this reference are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, matching the environmental compliance of the original STS7PF30L.
Q: What is the significance of "Active" versus "Not For New Designs" product status?
A: Active product status indicates the manufacturer continues production and supports the part for new designs. "Not For New Designs" status indicates the manufacturer has discontinued active support, though parts may remain available from inventory. For new product development, Active status parts are recommended to ensure long-term availability and manufacturer support.
Q: Can the IRF7240TRPBF (40V rating) be used in a circuit designed for 30V operation?
A: Yes. The IRF7240TRPBF is rated for 40V Vdss, which exceeds the 30V requirement. This part provides additional voltage margin and is electrically compatible with 30V circuit designs. However, the higher voltage rating is not necessary unless the application requires it.
Q: What is Gate Charge (Qg) and why does it vary among substitute parts?
A: Gate Charge is the total charge required to switch the MOSFET from off to on state. Higher gate charge requires more drive current from the gate driver circuit. The STS7PF30L specifies 38 nC at 4.5V. Substitute parts range from 16 nC to 110 nC depending on the device design. For gate driver compatibility, verify that the selected substitute part's gate charge specification is supported by the existing gate driver circuit.
Q: Is the DMP3036SSS-13 suitable for the STS7PF30L application?
A: The DMP3036SSS-13 meets the core electrical requirements (30V Vdss, 19.5A continuous drain current) and is ROHS3 compliant with MSL 1 rating. However, this part specifies a higher Vgs(th) threshold (3.0V vs. 2.5V) and lower power dissipation (1.4W vs. 2.5W). Verify gate driver voltage compatibility and thermal performance before selection.
Q: What packaging options are available for P-Channel 30V MOSFETs in this current rating range?
A: All substitute parts listed are available in 8-pin surface mount packages (8-SOIC or 8-SO format). These packages are standard for P-Channel MOSFETs in the 7A to 11A continuous drain current range. No alternative package formats are provided in this reference.
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