# SGM803B-TXN3LG

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

SGM803B-TXN3LG 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 | nRESET | output | Active-low reset output for the SGM803B, which is an open-drain output; it is held low when VCC falls below the reset threshold and keeps low for 240ms (TYP) after VCC exceeds the threshold. |
| 3 | VCC | power_in | Supply voltage pin, specified from 1V (TA = +25℃) to 5.5V, or 1.1V to 5.5V over -40℃ to +125℃. |

## 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 (VCC), TA = +25℃ |  | 1 |  | 5.5 | V | TA = +25℃ | 5 |
| Supply voltage (VCC), TA = -40℃ to +125℃ |  | 1.1 |  | 5.5 | V | TA = -40℃ to +125℃ | 5 |
| Supply current, SGM8_R/S/T |  |  | 300 | 430 | nA | VCC < 3.6V, SGM8_R/S/T, TA = +25℃ | 5 |
| Supply current, SGM8_R/S/T |  |  |  | 590 | nA | VCC < 3.6V, SGM8_R/S/T, TA = -40℃ to +125℃ | 5 |
| Reset voltage threshold, SGM8_T |  | 3.001 | 3.08 | 3.151 | V | VCC falling, TA = +25℃ | 5 |
| Reset voltage threshold, SGM8_T |  | 2.966 |  | 3.181 | V | VCC falling, TA = -40℃ to +125℃ | 5 |
| Reset active timeout period |  | 150 | 240 | 370 | ms | TA = +25℃ | 5 |
| Reset active timeout period |  | 120 |  | 400 | ms | TA = -40℃ to +125℃ | 5 |
| RESET/nRESET output voltage low (SGM803B-R/S/T) |  |  |  | 0.3 | V | VCC = VTH(MIN), ISINK = 1.2mA | 5 |
| RESET/nRESET output voltage low (SGM803B-R/S/T/M/J) |  |  |  | 0.3 | V | VCC > 1V, ISINK = 50μA | 5 |
| Reset output low / input supply voltage: VCC absolute maximum | VCC | -0.3 |  | 6 | V |  | 3 |
| RESET, nRESET voltage | RESET, nRESET | -0.3 |  |  | V | Maximum printed as VCC + 0.3V | 3 |
| Rate of rise, VCC | VCC |  |  | 100 | V/μs |  | 3 |
| Junction temperature |  |  |  | 150 | ℃ |  | 3 |
| Storage temperature range |  | -65 |  | 150 | ℃ |  | 3 |
| Lead temperature (soldering) |  |  |  | 260 | ℃ | 10s | 3 |
| Operating temperature range |  | -40 |  | 125 | ℃ |  | 3 |
| Package thermal resistance, junction-to-ambient (SOT-23-3) | θJA |  | 250 |  | ℃/W | SOT-23-3 | 3 |

## CAD (KiCad official)

- Symbol: `SGM803B-TXN3LG`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `sgm803b-txn3lg-etched.step` / `sgm803b-txn3lg-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sgm803b-txn3lg.step` / `sgm803b-txn3lg.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/8757039304701435904) (13 pp, sha256 `f6a70cf4f20d9637`, retrieved 2026-10-17, 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/sgm803b-txn3lg-datasheet.pdf)