SI2301 MOSFET — Specifications & Equivalents
Manufacturer: Commonly produced by Vishay Siliconix
About the SI2301
The SI2301 is a P-channel MOSFET with a drain–source voltage (VDS) rating of 20 V, a continuous drain current (ID) of 2.2 A and an on-resistance (RDS(on)) of 0.13 Ω. It can dissipate up to 1.25 W and is rated to a junction temperature of 150 °C. It is supplied in the SOT23 package.
At a glance
- Type: P-channel MOSFET
- Max drain–source voltage (VDS): 20 V
- Max continuous drain current (ID): 2.2 A
- On-resistance (RDS(on)): 0.13 Ω
- Power dissipation (PD): 1.25 W
- Max junction temperature (TJ): 150 °C
- Package: SOT23
- Manufacturer: Commonly produced by Vishay Siliconix
Typical applications
With its 20 V drain–source rating the SI2301 sits in the very-low-voltage class of switching MOSFETs, typically found in battery protection and power-path switching, point-of-load converters and logic-level load switching in portable devices.
Gate drive and switching notes
Keep gate–source voltage within the ±8 V maximum; exceeding it punctures the gate oxide and destroys the device permanently.
Switching behaviour is characterised by a rise time of 36 ns and an output capacitance (Coss) of 223 pF, which together with the gate drive determines switching loss and the practical upper frequency limit.
Choosing a replacement for the SI2301
A drop-in substitute for the SI2301 must be the same P-channel type and offer a drain–source rating of at least 20 V, a continuous drain current rating of at least 2.2 A and an on-resistance no higher than 0.13 Ω if efficiency and heat matter.
Mechanically, check the replacement against the SOT23 footprint and confirm the pin order — parts sharing a package outline do not always share a pinout.
Where the application switches inductive loads or runs near the voltage limit, keep extra headroom rather than choosing a part that only just meets the original numbers.
Frequently asked questions
What is the SI2301?
The SI2301 is a P-channel MOSFET (metal-oxide-semiconductor field-effect transistor). It is rated for 20 V drain-source and 2.2 A continuous drain current.
What is the maximum voltage of the SI2301?
The SI2301 has a maximum drain-source voltage (Vds) of 20 V. Treat this as an absolute maximum and design with margin, especially when switching inductive loads.
How much current can the SI2301 handle?
It is rated for 2.2 A of continuous drain current, with power dissipation limited to 1.25 W. Real-world capability depends on your heatsinking and ambient temperature.
What is the on-resistance of the SI2301?
On-resistance (Rds(on)) is 0.13 Ω. Multiply by the square of your load current to estimate conduction loss.
What package does the SI2301 come in?
It is listed in SOT23. Verify the pinout of the specific variant, as one outline can carry different pin assignments.
What can I use to replace the SI2301?
No verified equivalents are listed yet. Choose a part of the same polarity that meets or exceeds every rating above and shares a compatible package and pinout.
Key Specifications
| Type | MOSFET |
|---|---|
| Channel Type | P -Channel |
| Drain-Source Voltage (Vds) | 20 V |
| Gate-Source Voltage (Vgs) | 8 V |
| Drain Current (Id) | 2.2 A |
| Drain-Source On-Resistance (Rds) | 0.13 |
| Rise Time (tr) | 36 nS |
| Output Capacitance (Coss) | 223 pF |
| Junction Temperature (Tj) | 150 °C |
| Package | SOT23 |
| Power Dissipation (Pd) | 1.25 W |
Equivalent & Replacement Parts
No verified equivalents are listed for SI2301 yet.