# ME432AXG

**MICRONE** · Voltage Reference · SOT-23

ME432AXG from MICRONE, in a SOT-23. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | REF | input | Reference input. Internally compared to the 1.25 V bandgap reference; drive from the tap of the external R1/R2 divider between K and A to program V_KA = V_REF·(1 + R1/R2) + I_REF·R1. Input bias current I_REF ≈ 0.15 µA typ (0.4 µA max) at I_KA = 10 mA. |
| 2 | A | power_in | Anode. Return terminal of the shunt regulator; connected to ground/low side in typical bias applications. Sinks the cathode current back to the supply return. |
| 3 | K | power_in | Cathode. High-side terminal of the shunt regulator; typically tied through a pull-up resistor from the rail (V_KA up to 18 V, absolute max 20 V). Regulates V_KA to the programmed voltage as it sinks 70 µA-100 mA. Dynamic impedance |Z_KA| ≈ 0.05 Ω typ at 1 kHz. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | MICRONE |
| Package | SOT-23 |
| Category | PMIC |
| Pins | 3 |

## Ordering variants

Same part, different packaging or reel option.

- `ME432AXG`
- `ME432BXG`
- `ME432ATG`
- `ME432BTG`
- `ME432ATBG`
- `ME432BTBG`
- `ME432NAXG`
- `ME432NBXG`

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Cathode voltage (absolute max) | VKA |  |  | 20 | V |  | 3 |
| Cathode current range, continuous (absolute max) | IKA | -100 |  | 100 | mA |  | 3 |
| Reference input current (absolute max) | IREF |  |  | 10 | mA |  | 3 |
| Maximum power dissipation, SOT23 (absolute max) | PD |  |  | 300 | mW |  | 3 |
| Junction temperature range (absolute max) | TJ | -40 |  | 150 | ℃ |  | 3 |
| Storage temperature range (absolute max) | TSTG | -55 |  | 150 | ℃ |  | 3 |
| Thermal resistance junction to ambient, SOT23 | θJA |  | 350 |  | ℃/W |  | 3 |
| Cathode voltage (recommended operating) | VKA |  |  | 18 | V |  | 4 |
| Cathode current (recommended operating) | IKA | 0.1 |  | 100 | mA |  | 4 |
| Operating ambient temperature range |  | -40 |  | 85 | ℃ |  | 4 |
| Reference voltage, 0.5% grade (ME432A) | VREF | 1.244 | 1.25 | 1.256 | V | VKA=VREF, IKA=10mA | 4 |
| Reference voltage deviation over temperature, 0 to 70 ℃ | ΔVREF |  | 4 | 12 | mV | VKA=VREF, IKA=10mA, 0 ~ 70℃ | 4 |
| Reference voltage deviation over temperature, -40 to 85 ℃ | ΔVREF |  | 5 | 12 | mV | VKA=VREF, IKA=10mA, -40 ~ 85℃ | 4 |
| Dynamic impedance | KA / Z / |  | 0.05 | 0.15 | Ω | VKA=VREF, IKA=1 ~ 100mA, f≤1.0KHz | 4 |
| Minimum cathode working current | IKA(MIN) |  | 70 | 80 | uA | VKA=VREF | 4 |
| Ratio of reference input voltage change to cathode-anode voltage change | ΔVREF/ΔVKA |  | -1 | -2 | mV/V | IKA=10mA, ΔVKA=16V to VREF | 4 |
| Reference input current | IREF |  | 0.15 | 0.4 | μA | IKA=10mA, R1=10KΩ, R2=∝ | 4 |
| Reference input current deviation over temperature | ΔIREF |  | 0.1 | 0.4 | μA | IKA=10mA, R1=10KΩ, R2=∝, TA=-40 ~150℃ | 4 |
| Off-state cathode current | IKA(OFF) |  | 0.01 | 0.05 | μA | VKA=18V, VREF=0 | 4 |
| Reference voltage temperature coefficient (over full temperature range) |  |  | 30 |  | PPM/℃ |  | 1 |

## CAD (KiCad official)

- Symbol: `ME432AXG`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `me432axg-etched.step` / `me432axg-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `me432axg.step` / `me432axg.glb` are the bare package body.

## 3D model downloads

Two STEP files. Same geometry, different body top:

| File | Size | Use it when |
|---|---|---|
| [`me432axg.step`](me432axg.step) | 59 KB | You want the bare part, or you mark your own boards. |
| [`me432axg-etched.step`](me432axg-etched.step) | 1.3 MB | You want the part with `ME432AXG` already on it. |

The marking in the etched file is real recessed geometry cut into the solid, not a
texture or a decal: 344 faces against 69 in the bare model. It
survives export, section views, and rendering in any CAD tool, and it drops straight
into KiCad or Fusion with no extra setup.

## Provenance

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

- **Datasheet:** [MICRONE datasheet](docs/me432axg-datasheet.pdf) (11 pp, sha256 `c3419ca376cad158`, retrieved 2026-08-17, 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:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/me432axg-datasheet.pdf)