# 78L15

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

78L15 from UMW, 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 +15V output, up to 100 mA. Recommended output capacitor Co = 0.1 µF ceramic to ground for stability. |
| 2 | GND | power_in | Common ground reference for input and output. Carries the quiescent current (typ 2.2 mA, max 6 mA for 78L15). |
| 3 | INPUT | power_in | Unregulated DC input. Absolute maximum Vi = 35 V. Recommended input capacitor C1 = 0.33 µF to ground if the regulator is located far from the power-supply filter. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | UMW |
| Package | SOT-89 |
| 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 |
|---|---|---|---|---|---|---|---|
| Output voltage (TJ=25°C) | VO | 14.4 | 15 | 15.6 | V | TJ=25°C; VI=23V, IO=40mA | 10 |
| Output voltage (line and load) | VO | 14.25 | 15 | 15.75 | V | 17.5V≤VI≤30V, IO=1mA~40mA | 10 |
| Output voltage (line and load, full range) | VO | 14.25 | 15 | 15.75 | V | 17.5V≤VI≤VMAX, IO=1mA~70mA | 10 |
| Input voltage (for VO=3.3 to 18V) | VI |  |  | 35 | V | For VO=3.3 to 18V (applies to 78L15) | 2 |
| Input voltage (for VO=24V) | VI |  |  | 40 | V | For VO=24V only; not applicable to 78L15 | 2 |
| Power dissipation (SOT-89) | Pd |  |  | 400 | mW |  | 2 |
| Junction temperature range | TOPR | -20 |  | 120 | °C |  | 2 |
| Storage temperature range | TSTG | -55 |  | 150 | °C |  | 2 |

## CAD (KiCad official)

- Symbol: `78L15`
- Footprint: `Package_TO_SOT_SMD:SOT-89-3`
- 3D model: SOT-89 (KiCad packages3D, STEP)
- 3D model files: `78l15-etched.step` / `78l15-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `78l15.step` / `78l15.glb` are the bare package body.

## 3D model downloads

Two STEP files. Same geometry, different body top:

| File | Size | Use it when |
|---|---|---|
| [`78l15.step`](78l15.step) | 57 KB | You want the bare part, or you mark your own boards. |
| [`78l15-etched.step`](78l15-etched.step) | 896 KB | You want the part with `78L15` already on it. |

The marking in the etched file is real recessed geometry cut into the solid, not a
texture or a decal: 243 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/78l15-datasheet.pdf) (22 pp, sha256 `3eeae843c9f51425`, 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/78l15-datasheet.pdf)