component

AO3400A

Public Unreviewed

by Ray

AOS 30 V N-channel logic-level MOSFET, SOT-23. ~28 mohm RDS(on), 5.7 A. The default SMD load switch. Datasheet-verified.

componenttransistormosfetn-channellogic-levelsot-23alpha-omega
Overview Files Discover Packages Releases Dependencies Issues Breadcrumbs Pull Requests Activity

3D Model

Open in new tab ↗
Loads on click. Unloads when scrolled away or the tab is hidden.

Symbol & Footprint

Schematic Symbol

Open full view ↗
Loads on click. Unloads when scrolled away or the tab is hidden.

PCB Footprint

Open full view ↗
Loads on click. Unloads when scrolled away or the tab is hidden.

Datasheet

Open in new tab ↗
Loads on click. Unloads when scrolled away or the tab is hidden.
Download PDF
Contents

README

markdown

AO3400A

Alpha & Omega Semiconductor · N-channel logic-level MOSFET · SOT-23

A 30 V N-channel logic-level MOSFET in SOT-23, one of the most-used surface-mount switching FETs in modern designs. Its very low on-resistance (about 28 milliohm at VGS=10 V, and still low at 4.5 V) and 5.7 A rating let it switch power loads, act as a low-side gate for LEDs, motors, and relays, or serve as a load switch, all while turning fully on from 3.3 V or 5 V logic. In the tiny SOT-23 it replaces bulkier through-hole MOSFETs on space-constrained boards. Pinout is G, S, D. It is a near drop-in for the 2N7002 at much higher current.

Pinout

Pin Name Type Function
1 G input Gate. Controls conduction between drain and source. Gate threshold voltage VGS(th) typ 1.05V (0.65V-1.45V). Absolute maximum VGS = ±12V. Input capacitance Ciss ≈ 630 pF.
2 S passive Source. Current return terminal for the N-channel MOSFET. Body diode anode (body-diode forward voltage typ 0.7V, max 1V at IS=1A).
3 D passive Drain. High-side terminal of the N-channel MOSFET. Absolute maximum VDS = 30V. Continuous drain current ID = 5.7A at TA=25°C, pulsed IDM = 30A. Body diode cathode.

Key specifications

Parameter Value
Type N-channel MOSFET (logic-level)
Drain-source (VDS) 30 V
RDS(on) ~28 mΩ at VGS=10 V (~50 mΩ at 4.5 V)
Continuous drain current 5.7 A
Gate threshold 1-1.7 V (logic-level)
Power dissipation 1.4 W
Pinout G-S-D
Package SOT-23

Ordering variants

Same part, different packaging or reel option.

  • AO3400A (SOT-23)
  • AO3400 (SOT-23, prior rev)

CAD (KiCad official)

  • Symbol: Transistor_FET:AO3400A
  • Footprint: Package_TO_SOT_SMD:SOT-23
  • 3D model: SOT-23 (KiCad packages3D)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Alpha & Omega Semiconductor datasheet (5 pp, sha256 9c60d0b6c1ddc760, retrieved 2026-08-17, tier: manufacturer)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF