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AO3400 SOT-23 N-Channel MOSFET 30V 5.7A Logic-Level SMD (10-Pack)

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AO3400 SOT-23 N-Channel MOSFET - 30V / 5.7A Logic-Level SMD (10-Pack)

The AO3400 is a logic-level N-Channel enhancement-mode MOSFET from Alpha & Omega Semiconductor in a compact SOT-23 surface-mount package, rated at 30V / 5.7A with an ultra-low RDS(on) of 28m ohm. Its VGS(th) of just 0.45V to 1.0V ensures full enhancement from 3.3V MCU GPIO, making it one of the most capable logic-level MOSFETs in the SOT-23 package.

Key Specifications

Parameter	Value
Part Number	AO3400
Package	SOT-23 (SMD)
Channel Type	N-Channel
V(DS) Max	30V
I(D) Continuous	5.7A @ 25C
RDS(on) Max	28m ohm @ VGS=4.5V
VGS(th)	0.45V - 1.0V
VGS Max	+/-12V
Qg (Total Gate Charge)	5.4nC typical
Quantity	10 pieces

AO3400 vs Common SOT-23 N-Channel Alternatives

Part	V(DS)	I(D)	RDS(on)	VGS(th)
AO3400	30V	5.7A	28m ohm	0.45-1.0V
SI2302DS	20V	2.5A	85m ohm	0.4-1.0V
2N7002	60V	115mA	7.5 ohm	1.0-2.5V

Why Choose AO3400?

28m ohm RDS(on) - Lowest on-resistance in SOT-23 class; minimal conduction loss at 5A
5.7A Current Rating - Handles motor, solenoid, and LED load switching up to 5A
Logic-Level Gate - VGS(th) 0.45-1.0V; fully enhanced at 3.3V GPIO without gate driver
30V Rating - Safe for 12V and 24V system load switching
Pack of 10 - Ideal for prototyping and small production runs

Typical Applications

3.3V/5V MCU GPIO low-side load switching (LED arrays, relays, motors)
Synchronous rectifier in DC-DC buck converter
Battery-powered device power rail enable/disable
PWM motor speed control from MCU GPIO
USB power switch and current limiting
H-bridge low-side switch (paired with P-Channel AO3401)

FAQ

Q: Can AO3400 be driven directly from ESP32 3.3V GPIO? Yes - VGS(th) max is 1.0V, so 3.3V gate drive fully enhances the device. RDS(on) at VGS=2.5V is approximately 40m ohm, still excellent for most loads.

Q: What is the complementary P-Channel MOSFET for AO3400? AO3401 - P-Channel SOT-23, -30V, -4A, same package. Use AO3400 + AO3401 for complementary H-bridge or CMOS push-pull output stage.