# AO4842

**Alpha Omega Semicon** · MOSFETs · SOIC-8

AO4842 from Alpha Omega Semicon, in a SOIC-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | S1 | passive | Source terminal of MOSFET 1, rated with the 30V drain-source voltage (VDS) and ±20V gate-source voltage limits in the absolute maximum ratings. |
| 2 | G1 | input | Gate of MOSFET 1; the datasheet specifies a gate-source voltage limit of ±20V. |
| 3 | S2 | passive | Source terminal of MOSFET 2, rated with the 30V drain-source voltage (VDS) and ±20V gate-source voltage limits in the absolute maximum ratings. |
| 4 | G2 | input | Gate of MOSFET 2; the datasheet specifies a gate-source voltage limit of ±20V. |
| 5 | D2 | passive | Drain of MOSFET 2, rated for 30V drain-source voltage per the absolute maximum ratings. |
| 6 | D2 | passive | Drain of MOSFET 2 (internally common with pin 5), rated for 30V drain-source voltage per the absolute maximum ratings. |
| 7 | D1 | passive | Drain of MOSFET 1 (internally common with pin 8), rated for 30V drain-source voltage per the absolute maximum ratings. |
| 8 | D1 | passive | Drain of MOSFET 1, rated for 30V drain-source voltage per the absolute maximum ratings. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Alpha Omega Semicon |
| Package | SOIC-8 |
| Category | Transistors/Thyristors |
| Pins | 8 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Drain-Source Breakdown Voltage | BVDSS | 30 |  |  | V | ID=250µA, VGS=0V | 2 |
| On state drain current | ID(ON) | 64 |  |  | A | VGS=4.5V, VDS=5V | 2 |
| Zero Gate Voltage Drain Current | IDSS |  | 0.004 | 1 | µA | VDS=30V, VGS=0V | 2 |
| Zero Gate Voltage Drain Current (TJ=55°C) | IDSS |  |  | 5 | µA | VDS=30V, VGS=0V, TJ=55°C | 2 |
| Gate-Body leakage current | IGSS |  |  | 100 | nA | VDS=0V, VGS=±20V | 2 |
| Gate Threshold Voltage | VGS(th) | 1.5 | 2.1 | 2.6 | V | VDS=VGS, ID=250µA | 2 |
| Static Drain-Source On-Resistance | RDS(ON) |  | 16.8 | 21 | mΩ | VGS=10V, ID=7.7A | 2 |
| Static Drain-Source On-Resistance (TJ=125°C) | RDS(ON) |  | 24 | 29 | mΩ | TJ=125°C | 2 |
| Static Drain-Source On-Resistance | RDS(ON) |  | 23.4 | 30 | mΩ | VGS=4.5V, ID=5A | 2 |
| Forward Transconductance | gFS |  | 20 |  | S | VDS=5V, ID=7.7A | 2 |
| Diode Forward Voltage | VSD |  | 0.75 | 1 | V | IS=1A, VGS=0V | 2 |
| Maximum Body-Diode Continuous Current | IS |  |  | 2.4 | A |  | 2 |
| Input Capacitance | Ciss |  | 373 | 448 | pF | VGS=0V, VDS=15V, f=1MHz | 2 |
| Output Capacitance | Coss |  | 67 |  | pF | VGS=0V, VDS=15V, f=1MHz | 2 |
| Reverse Transfer Capacitance | Crss |  | 41 |  | pF | VGS=0V, VDS=15V, f=1MHz | 2 |
| Gate resistance | Rg |  | 1.8 | 2.8 | Ω | VGS=0V, VDS=0V, f=1MHz | 2 |
| Total Gate Charge (10V) | Qg |  | 7.2 | 11 | nC | VGS=10V, VDS=15V, ID=7.7A | 2 |
| Total Gate Charge (4.5V) | Qg |  | 3.5 |  | nC |  | 2 |
| Gate Source Charge | Qgs |  | 1.3 |  | nC | VGS=10V, VDS=15V, ID=7.7A | 2 |
| Gate Drain Charge | Qgd |  | 1.7 |  | nC | VGS=10V, VDS=15V, ID=7.7A | 2 |
| Turn-On DelayTime | tD(on) |  | 4.5 |  | ns | VGS=10V, VDS=15V, RL=1.95Ω, RGEN=3Ω | 2 |
| Turn-On Rise Time | tr |  | 2.7 |  | ns | VGS=10V, VDS=15V, RL=1.95Ω, RGEN=3Ω | 2 |
| Turn-Off DelayTime | tD(off) |  | 14.9 |  | ns | VGS=10V, VDS=15V, RL=1.95Ω, RGEN=3Ω | 2 |
| Turn-Off Fall Time | tf |  | 2.9 |  | ns | VGS=10V, VDS=15V, RL=1.95Ω, RGEN=3Ω | 2 |
| Body Diode Reverse Recovery Time | trr |  | 10.5 | 12.6 | ns | IF=7.7A, dI/dt=100A/µs | 2 |
| Body Diode Reverse Recovery Charge | Qrr |  | 4.5 |  | nC | IF=7.7A, dI/dt=100A/µs | 2 |
| Drain-Source Voltage | VDS |  |  | 30 | V |  | 1 |
| Gate-Source Voltage | VGS | -20 |  | 20 | V |  | 1 |
| Continuous Drain Current | ID |  |  | 7.7 | A | TA=25°C | 1 |
| Continuous Drain Current | ID |  |  | 6.5 | A | TA=70°C | 1 |
| Pulsed Drain Current | IDM |  |  | 64 | A |  | 1 |
| Power Dissipation | PD |  |  | 2 | W | TA=25°C | 1 |
| Power Dissipation | PD |  |  | 1.44 | W | TA=70°C | 1 |
| Junction and Storage Temperature Range | TJ, TSTG | -55 |  | 150 | °C |  | 1 |
| Maximum Junction-to-Ambient (t ≤ 10s) | RθJA |  | 50 | 62.5 | °C/W | t ≤ 10s | 1 |
| Maximum Junction-to-Ambient (Steady-State) | RθJA |  | 82 | 110 | °C/W | Steady-State | 1 |
| Maximum Junction-to-Lead (Steady-State) | RθJL |  | 41 | 50 | °C/W | Steady-State | 1 |

## CAD (KiCad official)

- Symbol: `AO4842`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `ao4842-etched.step` / `ao4842-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ao4842.step` / `ao4842.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Alpha Omega Semicon datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588906772317159424) (4 pp, sha256 `9cae02887f84cbb7`, retrieved 2026-10-13, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/ao4842-datasheet.pdf)