# CBM431Z23

**Corebai Microelectronics** · Voltage Reference · SOT-23-3

CBM431Z23 from Corebai Microelectronics, in a SOT-23-3. 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 | REFERENCE | input | Reference voltage input pin; the internal reference is about 2.5 V (VREF 2.440 V to 2.550 V for the 2% CBM431Z), and the output is set by external resistors between cathode, reference and anode. |
| 2 | ANODE | output | Anode pin, classified as output in the datasheet table; the cathode-to-anode voltage is specified over 0.01 V to 40 V. |
| 3 | CATHODE | bidirectional | Cathode pin, classified as input/output in the datasheet; it sinks current from 0.1 mA to 100 mA and the cathode-to-anode voltage is rated up to 40 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Corebai Microelectronics |
| Package | SOT-23-3 |
| 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 |
|---|---|---|---|---|---|---|---|
| 阴极-阳极电压 (Cathode-anode voltage) | VKA |  | 0.01 | 40 | V |  | 6 |
| 阴极电流 (Cathode current) | IK | 0.5 |  | 100 | mA |  | 6 |
| 基准输入电压 (Reference input voltage, CBM431Z 2%) | VREF | 2.44 | 2.495 | 2.55 | V | VKA = VREF, IK = 10mA | 6 |
| 过满载温度范围基准输入电压偏差 (Reference voltage deviation over temperature range) | VREF(dev) |  | 3 | 17 | MV | Tmin ≤ Ta ≤ Tmax | 6 |
| 基准输入电压变化与阴极电压变化比 (Reference voltage change with cathode voltage, ΔVKA = 10V-VREF) | ∆VREF/∆VKA |  | -1.4 | -2.7 | mV/V | ∆VKA = 10V-VREF | 6 |
| 基准输入电压变化与阴极电压变化比 (Reference voltage change with cathode voltage, ΔVKA = 36V-10V) | ∆VREF/∆VKA |  | -1 | -2 | mV/V | ∆VKA = 36V- 10V | 6 |
| 基准输入电流 (Reference input current) | IREF |  | 1.8 | 4 | μA | R1 = 10KΩ, R2 = ∞ | 6 |
| 过满载温度范围基准输入电流偏差 (Reference input current deviation over temperature range) | IREF(dev) |  | 0.4 | 1.2 | μA | R1 = 10KΩ, R2 = ∞ | 6 |
| 调节器最小阴极电流 (Minimum cathode current for regulation) | IK(min) |  | 0.25 | 0.5 | mA |  | 6 |
| 关闭状态阴极电流 (Off-state cathode current) | IK(off) |  | 0.17 | 0.9 | μA | VKA = 40 V, VREF = 0 | 6 |
| 动态阻抗 (Dynamic impedance) | ZKA |  | 0.27 | 0.5 | Ω | IK = 10mA 至 100 mA, f ≤ 1.0KHz | 6 |

## CAD (KiCad official)

- Symbol: `CBM431Z23`
- Footprint: `Package_TO_SOT_SMD:SOT-23-3`
- 3D model: SOT-23-3 (KiCad packages3D, STEP)
- 3D model files: `cbm431z23-etched.step` / `cbm431z23-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cbm431z23.step` / `cbm431z23.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/8603120059254517760) (19 pp, sha256 `15a0ad8a12bea410`, retrieved 2026-10-19, 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/cbm431z23-datasheet.pdf)