# 78L09-150

**UMW** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-89-3

78L09-150 from UMW, in a SOT-89-3. 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 | Vout | power_out | Regulated +9 V output (typ 9.0 V, min 8.91 V, max 9.09 V at Tj=25°C). Delivers up to 150 mA. Requires a Co=0.1 µF output capacitor to ground for stability. |
| 2 | GND | power_in | Common ground / return reference for the regulator. Carries quiescent current (typ 2 mA, max 5.5 mA) plus load return. |
| 3 | INPUT | power_in | Unregulated DC input supply. Recommended Vi=15 V nominal for the 78L09; absolute maximum 35 V. Dropout voltage typ 1.7 V (Vi must exceed Vo by at least this margin). Bypass with C1=0.33 µF to ground close to the pin. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | UMW |
| Package | SOT-89-3 |
| Category | 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 |
|---|---|---|---|---|---|---|---|
| Input voltage (for VO=3.3~18V) | VI |  |  | 35 | V | for VO=3.3~18V | 2 |
| High power dissipation | PD |  |  | 800 | mW |  | 2 |
| Junction Temperature Range | TOPR | -40 |  | 105 | °C |  | 2 |
| Storage Temperature Range | TSTG | -55 |  | 150 | °C |  | 2 |
| Output Voltage | VO | 8.91 | 9 | 9.09 | V | TJ=25°C | 6 |

## CAD (KiCad official)

- Symbol: `78L09-150`
- Footprint: `Package_TO_SOT_SMD:SOT-89-3`
- 3D model: SOT-89-3 (KiCad packages3D, STEP)
- 3D model files: `78l09-150-etched.step` / `78l09-150-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `78l09-150.step` / `78l09-150.glb` are the bare package body.

## 3D model downloads

Two STEP files. Same geometry, different body top:

| File | Size | Use it when |
|---|---|---|
| [`78l09-150.step`](78l09-150.step) | 57 KB | You want the bare part, or you mark your own boards. |
| [`78l09-150-etched.step`](78l09-150-etched.step) | 1.4 MB | You want the part with `78L09-150` already on it. |

The marking in the etched file is real recessed geometry cut into the solid, not a
texture or a decal: 358 faces against 42 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:** [UMW datasheet](docs/78l09-150-datasheet.pdf) (17 pp, sha256 `fe2f4e8f0d975d52`, 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/78l09-150-datasheet.pdf)