# L7812ABD2T-TR

**STMicroelectronics** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · TO-263-2

L7812ABD2T-TR from STMicroelectronics, in a TO-263-2. 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 | INPUT | power_in | Unregulated positive DC input. Absolute maximum VI = 35 V for VO = 5 to 18 V variants. Typical operating VI = 19 V for the L7812AB (VO nominal + ~7 V headroom). Dropout voltage typ. 2 V at IO = 1 A. Bypass to GND with 0.33 uF (tantalum/ceramic) near the pin, especially if the supply filter is remote. |
| 2 | GROUND | power_in | Common ground reference for input and output. Also serves as the thermal pad / tab on the D2PAK package (electrically connected to GND). All quiescent current (~4.4 mA typ. for L7812AB) returns through this pin. Solder the tab to a copper pour for heat dissipation (RthJC = 3 °C/W, RthJA = 62.5 °C/W for D2PAK). |
| 3 | OUTPUT | power_out | Regulated +12 V DC output. L7812AB tolerance is +/-2% (11.75 to 12.25 V at TJ = 25 °C). Supplies up to 1 A continuously (1.5 A peak with sufficient heat sinking); internally current-limited (short-circuit current typ. 0.2 A at VI = 35 V). Bypass to GND with 0.1 uF ceramic close to the pin to improve transient response. Minimum load current for regulation is 5 mA. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | TO-263-2 |
| Category | PMIC |
| Pins | 3 |

## Ordering variants

- `L7812ABD2T-TR`
- `L7812ABD2T-TRV`
- `L7812ABD2T-TRV-DG`
- `L7812ABD2T-TRP`
- `L7812ABD2T-TRDT-TR`

## CAD (KiCad official)

- Symbol: `L7812ABD2T-TR`
- Footprint: `Package_TO_SOT_SMD:TO-263-2`
- 3D model: TO-263-2 (KiCad packages3D, STEP)
- 3D model files: `l7812abd2t-tr-etched.step` / `l7812abd2t-tr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `l7812abd2t-tr.step` / `l7812abd2t-tr.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [STMicroelectronics datasheet](https://www.st.com/resource/en/datasheet/l7812abd2t-tr.pdf) (None pp, sha256 `f7b390b5c05e0aba`, retrieved 2026-08-17, tier: manufacturer)
- **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/l7812abd2t-tr-datasheet.pdf)