# CBM811TST4

**Corebai Microelectronics** · Supervisor And Reset ICs · SOT-143-4

CBM811TST4 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 | Power supply ground, 0 V reference for the device. |
| 2 | RESET | output | Active-low reset output for the CBM811 (the CBM812 uses an active-high RESET on this pin); it stays asserted while VCC is below the reset threshold and for 240 ms typical after VCC rises above it, and remains valid down to VCC = 1 V. |
| 3 | MR | input | Manual reset input with debounce: inputs shorter than 100 ns are ignored, inputs longer than 10 µs trigger reset, and the input has an internal pull-up of 10 to 30 kΩ (20 kΩ typical). |
| 4 | VCC | power_in | Monitored supply voltage input (2.5 V, 3 V, 3.3 V or 5 V as printed on the pin table); the absolute maximum rating is −0.3 V to +6 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Corebai Microelectronics |
| Package | SOT-143-4 |
| Category | Power Management (PMIC) |
| 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 |
|---|---|---|---|---|---|---|---|
| Reset voltage threshold (CBM811T/812T, 3.08 V variant) |  | 3.03 | 3.08 | 3.14 | V | TA = −40°C to +85°C | 5 |
| Reset voltage threshold (CBM811T/812T, 3.08 V variant, wide-limit row) |  | 3 |  | 3.15 | V | TA = −40°C to +85°C | 5 |
| Supply voltage |  | 1 |  | 5.5 | V |  | 5 |
| Supply current |  |  | 8 | 15 | μA |  | 5 |
| Manual reset minimum pulse width |  | 10 |  |  | μs |  | 5 |
| Manual reset glitch immunity (signals below this are ignored) |  |  |  | 100 | ns |  | 5 |
| Manual reset transmission delay to reset |  |  | 0.5 |  | μs |  | 5 |
| Manual reset internal pull-up resistor |  | 10 | 20 | 30 | kΩ |  | 5 |
| Manual reset input high voltage (fixed) |  | 2.3 |  |  | V |  | 5 |
| Manual reset input low voltage (fixed) |  |  |  | 0.8 | V |  | 5 |
| Manual reset input high threshold (VCC-relative) |  | 0.7 |  |  | *VCC |  | 5 |
| Manual reset input low threshold (VCC-relative) |  |  |  | 0.25 | *VCC |  | 5 |
| Power-on reset timeout (minimum) |  | 140 |  |  | ms |  | 1 |
| Reset timeout after VCC rises above threshold |  |  | 240 |  | ms | VCC above reset threshold | 8 |
| VCC supply voltage (absolute maximum) |  | -0.3 |  | 6 | V | relative to GND | 4 |
| Input voltage range (MR) |  | -0.3 |  |  | V | maximum is VCC + 0.3 V | 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 | 4 |
| Operating temperature range |  | -40 |  | 85 | °C |  | 10 |
| Storage temperature range |  | -65 |  | 160 | °C |  | 4 |
| Lead temperature (soldering, 10 s) |  |  |  | 300 | °C | 10 s | 4 |
| Vapor phase reflow temperature |  |  |  | 215 | °C | 60 s | 4 |
| Infrared reflow temperature |  |  |  | 220 | °C | 15 s | 4 |
| ESD rating |  |  | 3 |  | kV |  | 4 |
| Thermal resistance junction-to-ambient (θJA) | θJA |  | 330 |  | °C/W |  | 4 |

## CAD (KiCad official)

- Symbol: `CBM811TST4`
- Footprint: `Package_TO_SOT_SMD:SOT-143`
- 3D model: SOT-143-4 (KiCad packages3D, STEP)
- 3D model files: `cbm811tst4-etched.step` / `cbm811tst4-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cbm811tst4.step` / `cbm811tst4.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Corebai Microelectronics datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590918964518744064) (10 pp, sha256 `4552d360b50c8779`, retrieved 2026-10-20, 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-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/cbm811tst4-datasheet.pdf)