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SOT-23 · SI2302
ActiveMOSFET (N-Channel)
SI2302
Vishay · SOT-23 · MOSFET (N-Channel)
Price on Request
Get a competitive quote within 24 hours. Volume discounts available. Shenzhen stock ships in 1-2 business days.
Overview
The SI2302 is Vishay's 20 V N-channel trench MOSFET in the compact SOT-23 package, rated for 2.8 A continuous drain current and 65 mΩ on-resistance at Vgs=4.5 V. It is one of the most popular logic-level load switches and level-shifters in modern portable electronics — phones, wearables, drones, IoT sensors, battery packs — anywhere you need to switch a few amps from a 3.3 V or 1.8 V MCU GPIO with minimal heat.
The gate threshold is 0.6-1.2 V, which means it fully turns on at Vgs=2.5 V, well below the 3.3 V rail of most modern MCUs. This makes it a direct replacement for the 2N7002 (which needs 5 V to reach its 2.4 Ω spec) in low-voltage designs. At Vgs=4.5 V the Rds(on) drops to 65 mΩ typ / 90 mΩ max, dissipating only 65 mW at 1 A — cool enough to skip a heatsink.
Package is standard SOT-23 with pinout G-D-S (pin 1 = Gate, pin 2 = Source, pin 3 = Drain). Absolute maximum drain-source voltage is 20 V, so it is safe for single-cell Li-ion (4.2 V max), 3.3 V, 5 V and 12 V rails with margin, but not for 24 V systems.
Total gate charge is only 5 nC, so switching speeds into the tens of MHz are achievable with a proper gate driver. Body diode is fast enough for most synchronous buck applications under 500 kHz.
Related parts in the family: SI2300 (20 V, 2.8 A, P-channel — complementary), SI2301 (20 V, 2.3 A, P-channel), SI2304 (20 V, 4 A, N-channel), AO3400 (Alpha & Omega, 30 V, 5.7 A, same package).
Our Shenzhen stock: Vishay SI2302DS-T1-GE3 (SOT-23 tape-and-reel) MOQ 3,000 pcs, or 100 pcs loose.
Key Features
- 20 V drain-source, 2.8 A continuous drain current
- Logic-level gate (Vgs(th) 0.6-1.2 V) works with 3.3 V MCUs
- 65 mΩ Rds(on) at Vgs=4.5 V
- Compact SOT-23 package fits high-density boards
Typical Applications
- Load switching for sensors, radios and displays in portable devices
- Battery management and reverse-polarity protection
- DC-DC buck converters under 3 A output
- LED dimming and PWM control
- Level shifting for I²C, SPI and UART buses
Specifications
- Channel Type
- N-Channel
- Drain-Source Voltage
- 20 V
- Continuous Drain Current
- 2.8 A
- Rds(on) Max
- 0.065 Ω
- Gate Threshold
- 0.6 to 1.2 V
- Power Dissipation
- 1.25 W
- Operating Temperature
- -55 to 150 °C
- Mounting Type
- Surface Mount
- RoHS
- Compliant
Procurement Tips
For battery-powered designs where 20 V is more than enough, standardize on SI2302 or AO3400 — they cover 90% of load-switch needs and simplify BOM consolidation.
Frequently Asked Questions
SI2302 vs 2N7002 — which should I use?
For 3.3 V systems and currents above 200 mA, SI2302 wins: it has 10× lower Rds(on) at Vgs=3.3 V and can handle 2.8 A vs 300 mA. For 5 V systems and small-signal switching under 100 mA, 2N7002 is cheaper and adequate. SI2302 is limited to 20 V; 2N7002 handles 60 V.
Can I drive SI2302 directly from a 3.3 V MCU?
Yes, that's exactly what it's designed for. Vgs(th) is 0.6-1.2 V, and at Vgs=3.3 V you get about 80 mΩ Rds(on) — well within spec. Add a 100 Ω series gate resistor to damp ringing and a 10 kΩ gate-to-source pull-down for safe default-off during MCU reset.
What's the maximum switching frequency?
Practically 500 kHz to 1 MHz with a proper gate driver. Gate charge is only 5 nC, so switching losses are low. At 100 kHz with 2 A load and 5 V supply, switching loss is about 100 mW — manageable.
Does SI2302 have ESD protection?
Basic gate-source zener clamping (±20 V), but the gate oxide is still vulnerable to CDM (charged device model) ESD during assembly. Handle with grounded equipment. For exposed connectors, add an external TVS diode.
Is SI2302 counterfeit-prone?
Moderately. Genuine Vishay parts have laser-etched "SI2302" plus date code, matte tin leads, and consistent weight. Fakes may be remarked SI2300 (P-channel) or lower-voltage clones. Verify with a curve tracer or measure Rds(on) at Vgs=4.5 V — genuine parts read under 90 mΩ; clones often exceed 200 mΩ.
MOQ and lead time?
MOQ 3,000 pcs on reel for SI2302DS-T1-GE3, or 100 pcs loose. Vishay authorized 8-16 weeks; Shenzhen stock 1-2 days.
Alternatives & Equivalents
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