Build with AO3402 — Datasheet Specs & AI Design Help

00 — Overview

What the AO3402 does

The AO3402 is a 30V N-Channel MOSFET utilizing advanced trench technology for low on-resistance and efficient switching. It supports gate voltages as low as 2.5V and handles continuous drain currents up to 4A with a static drain-source on-resistance below 52mW at 10V gate drive. This device is suitable for use as a load switch or in PWM applications. Key parameters include a 30V breakdown voltage, 12nC total gate charge at 10V, and a junction temperature range from -55°C to 150°C. The part features a body diode with a reverse recovery time of 8.5ns and operates with a maximum junction-to-ambient thermal resistance of 100°C/W in steady-state conditions.

Next step

Start building with AO3402 → Every number above is cited straight from the datasheet — ask what they mean for your design, and the assistant answers from the same source documents.

01 — Key specifications

Datasheet parameters

Datasheet parameters for AO3402
Parameter	Min	Typ	Max	Conditions	Source
rds on	—	4.37 Ohm	5.28 Ohm	VGS = 10V, ID = 4ATJ = 125°C; rds(on); STATIC PARAMETERS	Alpha & Omega Semiconductor datasheet, p. 2 — Product Summary
forward voltage	—	750 mV	1 V	IS = 1A, VGS = 0V; vsd; STATIC PARAMETERS	Alpha & Omega Semiconductor datasheet, p. 2 — Product Summary
operating temperature	-55 °C	—	150 °C		Alpha & Omega Semiconductor datasheet, p. 1 — Product Summary
power dissipation	—	—	1.4 W	TA = 25°C; Product Summary	Alpha & Omega Semiconductor datasheet, p. 1 — Product Summary
breakdown voltage ds	30 V	—	—	ID = 250µA, VGS = 0V; STATIC PARAMETERS	Alpha & Omega Semiconductor datasheet, p. 2 — Product Summary
drain current	—	—	4 A	TA = 25°C; continuous; Product Summary	Alpha & Omega Semiconductor datasheet, p. 1 — Product Summary
vgs threshold	500 mV	1 V	1.5 V	VDS = VGSID = 250µA; vgs(th); STATIC PARAMETERS	Alpha & Omega Semiconductor datasheet, p. 2 — Product Summary
input capacitance	185 pF	235 pF	285 pF	VGS = 0V, VDS = 15V, f = 1MHz; ciss; DYNAMIC PARAMETERS	Alpha & Omega Semiconductor datasheet, p. 2 — Product Summary
output capacitance	25 pF	35 pF	45 pF	VGS = 0V, VDS = 15V, f = 1MHz; coss; DYNAMIC PARAMETERS	Alpha & Omega Semiconductor datasheet, p. 2 — Product Summary
reverse transfer capacitance	10 pF	18 pF	25 pF	VGS = 0V, VDS = 15V, f = 1MHz; crss; DYNAMIC PARAMETERS	Alpha & Omega Semiconductor datasheet, p. 2 — Product Summary
gate charge	—	10 nC	12 nC	VGS = 10V, VDS = 15V, ID = 4A; qg(10v); SWITCHING PARAMETERS	Alpha & Omega Semiconductor datasheet, p. 2 — Product Summary
rise time	—	1.5 ns	—	VGS = 10V, VDS = 15V, RL = 3.75Ω, RGEN = 3Ω; tr; SWITCHING PARAMETERS	Alpha & Omega Semiconductor datasheet, p. 2 — Product Summary
fall time	—	2.5 ns	—	VGS = 10V, VDS = 15V, RL = 3.75Ω, RGEN = 3Ω; tf; SWITCHING PARAMETERS	Alpha & Omega Semiconductor datasheet, p. 2 — Product Summary

02 — Alternatives

Closest matches to AO3402

DMG2302UK 7.1× lower gate charge, 3.0× higher drain current, 2.1× lower power dissipation

AO3400A 15.0× lower reverse leakage current, 2.8× higher reverse transfer capacitance, 2.7× higher input capacitance

HL2310A 15.0× lower reverse leakage current, 10.0× higher rise time, 4.0× higher fall time

HL2302 19.3× higher rise time, 15.0× lower reverse leakage current, 8.8× higher fall time

MDD2302 15.0× lower reverse leakage current, 4.0× higher fall time, 3.3× higher output capacitance

Si2302CDS 15.0× lower reverse leakage current, 4.7× higher rise time, 2.9× lower gate charge

2N7002 15.0× lower reverse leakage current, 13.3× lower drain current, 7.6× lower input capacitance

HL2300 15.0× lower reverse leakage current, 13.2× higher rise time, 9.3× higher fall time

03 — FAQ

Frequently asked questions

What is the breakdown voltage (ds) of the AO3402?

The breakdown voltage (ds) is 30 V when ID = 250µA and VGS = 0V under STATIC PARAMETERS.

What is the continuous drain current of the AO3402 at TA = 25°C?

The continuous drain current is 4 A at TA = 25°C.

What is the fall time (tf) of the AO3402 under the conditions VGS = 10V, VDS = 15V, RL = 3.75Ω, and RGEN = 3Ω?

The fall time is 2.5 ns.

What is the forward voltage (VSD) when IS = 1A and VGS = 0V?

The forward voltage is 750 mV.

What is the gate charge (Qg) of the AO3402 when VGS = 10V, VDS = 15V, and ID = 4A?

The gate charge is 10 nC.

What is the input capacitance (Ciss) of the AO3402?

The input capacitance is 235 pF at VGS = 0V, VDS = 15V, and f = 1MHz.

What is the maximum operating temperature?

The maximum operating temperature is 150 °C.

What is the output capacitance (coss) of the AO3402?

The output capacitance is 35 pF at VGS = 0V, VDS = 15V, and f = 1MHz.

What is the power dissipation of the AO3402 at TA = 25°C?

The power dissipation is 1.4 W.

What is the rds(on) value when VGS = 10V, ID = 4A, and TJ = 125°C?

The rds(on) is 4.37 Ohm at VGS = 10V, ID = 4A, and TJ = 125°C.

What is the reverse transfer capacitance (crss) of the AO3402?

The reverse transfer capacitance is 18 pF at VGS = 0V, VDS = 15V, and f = 1MHz.

What is the rise time (tr) of the AO3402 when VGS = 10V, VDS = 15V, RL = 3.75Ω, and RGEN = 3Ω?

The rise time is 1.5 ns.