# 78D08L

**UMW** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · TO-252-2

78D08L from UMW, in a TO-252-2. 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 supply input. Absolute maximum V_I = 35 V (V_O ≤ 18 V variants). Recommended operating input range for the 78D08 is 10.5 V to 23 V (to guarantee regulation at 1 A) and up to 25 V per line-regulation spec. A 0.33 µF ceramic input bypass capacitor (C_IN) to GND is required close to the pin. |
| 2 | GND | power_in | Common ground reference for the regulator and its reference-voltage divider. On the TO-252 package this pin is electrically connected to the exposed tab/heat slug, which should be soldered to a copper pour for heat-sinking (θ_JC = 12.5 °C/W). |
| 3 | OUTPUT | power_out | Regulated +8 V output (7.68-8.32 V typ. at Tj=25°C, 7.6-8.4 V over I_O = 5 mA-1 A, V_I = 10.5-23 V). Delivers up to 1 A continuous (I_SC ≈ 800 mA, I_PK ≈ 1.3 A). Dropout voltage V_D ≈ 2 V at I_O = 500 mA. A 0.1 µF ceramic output capacitor (C_OUT) to GND is required for loop stability. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | UMW |
| Package | TO-252-2 |
| Category | PMIC |
| Pins | 3 |

## Ordering variants

- `78D08LL`

## 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 | 7.68 | 8 | 8.32 | V | 25°C | 5 |
| Output Voltage (full range) | VO | 7.6 |  | 8.4 | V | IO=5mA~1A, VI=10.5~23V | 5 |
| Line Regulation | ΔVO |  |  | 100 | mV | VI=10.5V~25V | 5 |
| Line Regulation | ΔVO |  |  | 50 | mV | VI=11V~25V | 5 |
| Load Regulation | ΔVO |  |  | 160 | mV | IO=5mA~500mA | 5 |
| Load Regulation | ΔVO |  |  | 80 | mV | IO=5mA~200mA | 5 |
| Quiescent Current Change | ΔIQ |  |  | 0.5 | mA | IO=5mA~350mA | 5 |
| Quiescent Current Change | ΔIQ |  |  | 0.8 | mA | IO=200mA, VI=10.5~25V | 5 |
| Quiescent Current | IQ |  |  | 8 | mA | TJ=25°C | 5 |
| DC Input Voltage | VI |  |  | 35 | V | for VO=5 to 18 V | 2 |
| Output Current | IOUT |  |  | 1 | A |  | 2 |
| Junction Temperature | TJ | -40 |  | 120 | °C |  | 2 |
| Storage Temperature | TSTG | -55 |  | 150 | °C |  | 2 |
| Junction to Case (TO-251/TO-252) | θJC |  | 12.5 |  | °C/W | TO-251/TO-252 package | 2 |

## CAD (KiCad official)

- Symbol: `78D08L`
- Footprint: `Package_TO_SOT_SMD:TO-252-2`
- 3D model: TO-252-2 (KiCad packages3D, STEP)
- 3D model files: `78d08l-etched.step` / `78d08l-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `78d08l.step` / `78d08l.glb` are the bare package body.

## 3D model downloads

Two STEP files. Same geometry, different body top:

| File | Size | Use it when |
|---|---|---|
| [`78d08l.step`](78d08l.step) | 119 KB | You want the bare part, or you mark your own boards. |
| [`78d08l-etched.step`](78d08l-etched.step) | 1.4 MB | You want the part with `78D08L` already on it. |

The marking in the etched file is real recessed geometry cut into the solid, not a
texture or a decal: 347 faces against 83 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/78d08l-datasheet.pdf) (15 pp, sha256 `0816f246cc64ec64`, 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/78d08l-datasheet.pdf)