# TPAX811RS4

**TECH PUBLIC** · Supervisor And Reset ICs · SOT-143

TPAX811RS4 from TECH PUBLIC, in a SOT-143. 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. |
| 2 | RESET | output | Active-low push-pull reset output (TPAX811): goes low when Vcc falls below the reset threshold and stays low for at least 140 ms after Vcc rises above the threshold. |
| 3 | MR | input | Active-low manual reset input with internal 20kΩ pull-up; reset is asserted while MR is low and held for 140 ms after MR returns high, can be left floating, driven by TTL/CMOS logic or shorted to ground by a switch. |
| 4 | VCC | power_in | Positive supply input, both the operating supply of the device and the monitored voltage; recommended 1.0 to 5.5 V, absolute maximum -0.3 to 6 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | TECH PUBLIC |
| Package | SOT-143 |
| Category | Power Management (PMIC) |
| Pins | 4 |

## CAD (KiCad official)

- Symbol: `TPAX811RS4`
- Footprint: `Package_TO_SOT_SMD:SOT-143`
- 3D model: SOT-143 (KiCad packages3D, STEP)
- 3D model files: `tpax811rs4-etched.step` / `tpax811rs4-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tpax811rs4.step` / `tpax811rs4.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [TECH PUBLIC datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590917163949768704) (7 pp, sha256 `c9922a64eb36b228`, retrieved 2026-10-18, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (vision), consensus `claude-opus-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/tpax811rs4-datasheet.pdf)