# AS78L12RTR-G1

**Diodes Incorporated** · Dropout Regulators(LDO) · SOT-89

AS78L12RTR-G1 from Diodes Incorporated, in a SOT-89. 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 | OUTPUT | power_out | Regulated +12V positive output. Delivers up to 100mA with typical dropout of 1.7V at 40mA and 1.8V at 100mA. A 0.1uF ceramic output capacitor to GND is recommended for stability and to limit high-frequency noise. |
| 2 | GND | power_in | Ground / common return. The center lead is also electrically connected to the large SOT-89 heat-spreader tab; both must be tied to the ground plane, which additionally serves as the thermal path (theta_JC = 28.3 degC/W in SOT-89). |
| 3 | INPUT | power_in | Unregulated positive supply input. Accepts up to 36V (absolute max) and up to 36V under recommended operating conditions for the AS78L12 variant. A 0.33uF input capacitor to GND is recommended, especially when the device is located more than a few inches from the bulk supply filter. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Diodes Incorporated |
| Package | SOT-89 |
| Category | Power Management ICs |
| Pins | 3 |

## Ordering variants

Same part, different packaging or reel option.

- `AS78L12RTR-G1`
- `AS78L12RTR-G1R`
- `AS78L12RTR-G1Z`
- `AS78L12RTR-G1M`

## CAD (KiCad official)

- Symbol: `AS78L12RTR-G1`
- Footprint: `Package_TO_SOT_SMD:SOT-89-3`
- 3D model: SOT-89 (KiCad packages3D, STEP)
- 3D model files: `as78l12rtr-g1-etched.step` / `as78l12rtr-g1-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `as78l12rtr-g1.step` / `as78l12rtr-g1.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Diodes Incorporated datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8560107478353805312) (17 pp, sha256 `dae32ffe04830377`, 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/as78l12rtr-g1-datasheet.pdf)