# NCV431BVDR2G

**onsemi** · Voltage Reference · SOIC-8

NCV431BVDR2G from onsemi, in a SOIC-8. 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 | CATHODE | passive | Cathode (K) of the shunt regulator. Regulated node - sinks 1.0 mA to 100 mA when VKA reaches the programmed value. Absolute max VKA = 37 V; continuous IK rated −100 to +150 mA. |
| 2 | ANODE | passive | Anode (A) of the shunt regulator (return / ground reference). Electrically common to the die-attach flag together with pins 3, 6 and 7; tie all four to the board's low-side/ground plane to realize the enhanced power-dissipation rating of the modified SOIC-8. |
| 3 | ANODE | passive | Anode / die-attach-flag connection. Electrically common with pins 2, 6 and 7 (Anode). Bond to the anode/ground copper for thermal transfer. |
| 4 | NC | unconnected | No internal connection. Leave floating or tie to Anode; do not use for signal routing. |
| 5 | NC | unconnected | No internal connection. Leave floating or tie to Anode; do not use for signal routing. |
| 6 | ANODE | passive | Anode / die-attach-flag connection. Electrically common with pins 2, 3 and 7 (Anode). Bond to the anode/ground copper for thermal transfer. |
| 7 | ANODE | passive | Anode (A) of the shunt regulator. Electrically common with pins 2, 3 and 6 via the die-attach flag; the four anode pins together form the low-side/return terminal. |
| 8 | REF | input | Reference input (R). Internal error amplifier compares this pin against the 2.495 V internal bandgap; drive from a resistor divider from Cathode to program VKA = (1 + R1/R2)·Vref. Iref = 1.1 µA typ (2.0 µA max @ 25 °C); Iref rated −0.05 to +10 mA. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | SOIC-8 |
| Category | Power Management (PMIC) |
| Pins | 8 |

## Ordering variants

Same part, different packaging or reel option.

- `NCV431BVDR2G`
- `NCV431BVDR2GTL431BVDR2G`
- `NCV431BVDR2GTL431BVDG`
- `NCV431BVDMR2G`
- `NCV431BVDR2GTL431BVDMR2G`
- `NCV431BVDR2GTL431BVPG`
- `NCV431BVDR2GTL431BVLPG`
- `NCV431BVDR2GTL431BVLPRAG`

## CAD (KiCad official)

- Symbol: `NCV431BVDR2G`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `ncv431bvdr2g-etched.step` / `ncv431bvdr2g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ncv431bvdr2g.step` / `ncv431bvdr2g.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [onsemi datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590004510652735488) (None pp, sha256 `c82bb95655b732ca`, retrieved 2026-08-17, tier: lcsc)
- **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/ncv431bvdr2g-datasheet.pdf)