# SGM809-RXN3

**SGMICRO** · Supervisor And Reset ICs · SOT-23

SGM809-RXN3 from SGMICRO, in a SOT-23. 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 | GND | power_in | Ground reference pin for the supervisory circuit. |
| 2 | RESET | output | Active-low push-pull reset output on the SGM809; it remains low while VCC is below the reset threshold and for 240ms (TYP) after VCC rises above the threshold. |
| 3 | VCC | power_in | Power supply voltage that is monitored; the RESET output remains operational with VCC as low as 1V and the device is specified from 1.2V to 5.5V over -40°C to +125°C. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | SGMICRO |
| Package | SOT-23 |
| Category | Power Management (PMIC) |
| Pins | 3 |

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Supply voltage (TA = 0 to +70 °C) |  | 1 |  | 5.5 | V | TA = 0℃ to +70℃ | 5 |
| Supply voltage (TA = -40 to +125 °C) |  | 1.2 |  | 5.5 | V | TA = -40℃ to +125℃ | 5 |
| Supply current (SGM8_R/S/T/Z/X) |  |  | 13 | 25 | μA | VCC < 3.6V, SGM8_R/S/T/Z/X, TA = +25℃ | 5 |
| Supply current (SGM8_R/S/T/Z/X) |  |  |  | 45 | μA | VCC < 3.6V, SGM8_R/S/T/Z/X, TA = -40℃ to +125℃ | 5 |
| Reset voltage threshold (SGM8_R) |  | 2.564 | 2.63 | 2.696 | V | TA = +25℃ | 5 |
| Reset voltage threshold (SGM8_R) |  | 2.5 |  | 2.76 | V | TA = -40℃ to +125℃ | 5 |
| VCC to RESET/RESET delay |  |  |  | 20 | μs | VCC = VTH to (VTH, 100mV) | 5 |
| Reset active timeout period |  | 150 | 240 | 560 | ms | TA = -40℃ to +85℃ | 5 |
| Reset active timeout period |  | 100 |  | 840 | ms | TA = -40℃ to +125℃ | 5 |
| RESET output low voltage (SGM809R/S/T/Z/X) |  |  |  | 0.3 | V | VCC = VTH(MIN), ISINK = 1.2mA | 5 |
| RESET output low voltage (SGM809R/S/T/L/M/J/Z/X) |  |  |  | 0.3 | V | VCC > 1.0V, ISINK = 50μA | 5 |
| RESET output high voltage (SGM809R/S/T/Z/X) |  | 0.8 |  |  | × VCC | VCC > VTH(MAX), ISOURCE = 500μA | 5 |
| Supply voltage VCC (absolute maximum) |  | -0.3 |  | 6 | V |  | 4 |
| RESET, RESET voltage (absolute maximum) |  | -0.3 |  |  | V |  | 4 |
| Input current, VCC |  |  |  | 20 | mA |  | 4 |
| Output current, RESET, RESET |  |  |  | 20 | mA |  | 4 |
| Rate of rise, VCC |  |  |  | 100 | V/μs |  | 4 |
| Power dissipation, PD (SOT-23-3) | PD |  |  | 0.4 | W | TA = 25℃ | 4 |
| Package thermal resistance, junction to ambient (SOT-23-3) | θJA |  |  | 250 | ℃/W | SOT-23-3 | 4 |
| Operating temperature range |  | -40 |  | 125 | °C |  | 4 |
| Junction temperature |  |  |  | 150 | °C |  | 4 |
| Storage temperature |  | -65 |  | 150 | °C |  | 4 |

## CAD (KiCad official)

- Symbol: `SGM809-RXN3`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `sgm809-rxn3-etched.step` / `sgm809-rxn3-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sgm809-rxn3.step` / `sgm809-rxn3.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [SGMICRO datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586182762189897728) (13 pp, sha256 `3ba33d0874d62803`, retrieved 2026-10-18, 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/sgm809-rxn3-datasheet.pdf)