# CBM811ZST4

**Corebai Microelectronics** · Monitors & Reset Circuits · SOT-143-4

CBM811ZST4 from Corebai Microelectronics, in a SOT-143-4. 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, 0 V supply reference. |
| 2 | RESET | output | Active-low logic reset output (CBM811 variant); stays asserted low down to VCC = 1 V and is held active for about 240 ms (typ) after VCC rises above the reset threshold. |
| 3 | MR | input | Debounced manual reset input; signals shorter than 100 ns are ignored and inputs longer than 10 µs trigger a reset, with an internal pull-up of 10 to 30 kΩ. |
| 4 | VCC | power_in | Monitored supply voltage input (2.5 V, 3 V, 3.3 V or 5 V systems); absolute maximum -0.3 V to +6 V, with a 2.32 V reset threshold for the CBM811Z. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Corebai Microelectronics |
| Package | SOT-143-4 |
| Category | Power Supply Chip |
| Pins | 4 |

## 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 | 1 |  | 5.5 | V |  | 5 |
| Supply current |  |  | 8 | 15 | μA |  | 5 |
| Reset threshold (CBM811Z) |  | 2.28 | 2.32 | 2.35 | V | TA = −40°C to +85°C | 5 |
| Reset threshold (CBM811Z), wide limit |  | 2.25 |  | 2.38 | V | TA = −40°C to +85°C | 5 |
| Manual reset pull-up resistance |  | 10 | 20 | 30 | kΩ |  | 5 |
| Manual reset minimum pulse width |  |  |  | 10 | μs |  | 5 |
| Manual reset glitch immunity |  |  | 100 |  | ns |  | 5 |
| Manual reset to reset propagation delay |  |  | 0.5 |  | μs |  | 5 |
| MR input high threshold |  | 0.7 |  |  | V | Input greater than 0.7*VCC (printed as 0.7*VCC V) | 5 |
| VCC terminal voltage | VCC | -0.3 |  | 6 | V | relative to GND | 4 |
| VCC input current |  |  |  | 20 | mA |  | 4 |
| MR input current |  |  |  | 20 | mA |  | 4 |
| RESET output current |  |  |  | 20 | mA |  | 4 |
| Power dissipation (SOT-143) |  |  |  | 200 | mW | TA = 70°C; derate 4 mW/°C above 70°C | 4 |
| Operating temperature range |  | -40 |  | 85 | °C |  | 4 |
| Storage temperature range |  | -65 |  | 160 | °C |  | 4 |
| Lead temperature (soldering, 10 s) |  |  |  | 300 | °C | 10 seconds | 4 |
| ESD rating |  |  |  | 3 | kV |  | 4 |
| Thermal resistance junction to ambient | θJA |  | 330 |  | °C/W | SOT-143 | 4 |

## CAD (KiCad official)

- Symbol: `CBM811ZST4`
- Footprint: `Package_TO_SOT_SMD:SOT-143`
- 3D model: SOT-143-4 (KiCad packages3D, STEP)
- 3D model files: `cbm811zst4-etched.step` / `cbm811zst4-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cbm811zst4.step` / `cbm811zst4.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Corebai Microelectronics datasheet](docs/cbm811zst4-datasheet.pdf) (10 pp, sha256 `eca50a375d8a7fde`, retrieved 2026-10-23, 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` (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/cbm811zst4-datasheet.pdf)