# 78D05G-AA3-R

**UTC Unisonic Tech** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-223-4

78D05G-AA3-R from UTC Unisonic Tech, in a SOT-223-4. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | I | power_in | Unregulated input voltage to the regulator; absolute maximum input voltage is 35 V, and a 0.33 µF input bypass capacitor should be placed as close to the regulator as possible. |
| 2 | G | power_in | Ground (common) reference pin for the regulator. |
| 3 | O | power_out | Regulated 5 V output for the 78D05, rated for output current up to 0.5 A, with a 0.1 µF output bypass capacitor recommended for stability and transient response. |
| 4 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | UTC Unisonic Tech |
| Package | SOT-223-4 |
| Category | Power Management (PMIC) |
| Pins | 4 |

## 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 | VOUT | 4.8 | 5 | 5.2 | V | IOUT=5mA~0.5A | 4 |
| Output Voltage | VOUT | 4.75 |  | 5.25 | V | VIN =7.5~20V,IOUT=5mA~0.5A | 4 |
| Load Regulation | ΔVOUT |  |  | 50 | mV | IOUT=5mA~0.5A | 4 |
| Load Regulation | ΔVOUT |  |  | 25 | mV | IOUT=5mA~200 mA | 4 |
| Line Regulation | ΔVOUT |  |  | 50 | mV | VIN =7V~25V | 4 |
| Quiescent Current | IQ |  |  | 8 | mA | IOUT=0.5A | 4 |
| Quiescent Current Change | ΔIQ |  |  | 1 | mA | VUT =7.5~20V | 4 |
| Quiescent Current Change | ΔIQ |  |  | 0.5 | mA | IOUT=5mA~0.5A | 4 |
| Ripple Rejection | RR | 62 | 80 |  | dB | VIN =8~18V,f=120Hz | 4 |
| Input Voltage | VIN |  |  | 35 | V |  | 4 |
| Output Current | IOUT |  |  | 0.5 | A |  | 4 |
| Power Dissipation (SOT-223) | PD |  |  | 8.3 | W | TC=25°C | 4 |
| Operating Junction Temperature | TJ | -20 |  | 150 | °C |  | 4 |
| Storage Temperature | TSTG | -65 |  | 150 | °C |  | 4 |
| Junction to Case Thermal Resistance (SOT-223) | θJC |  | 15 |  | °C/W |  | 4 |

## CAD (KiCad official)

- Symbol: `78D05G-AA3-R`
- Footprint: `Package_TO_SOT_SMD:SOT-223`
- 3D model: SOT-223-4 (KiCad packages3D, STEP)
- 3D model files: `78d05g-aa3-r-etched.step` / `78d05g-aa3-r-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `78d05g-aa3-r.step` / `78d05g-aa3-r.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [UTC Unisonic Tech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588904643254083584) (9 pp, sha256 `bdaf2be9f0e23b0e`, retrieved 2026-10-13, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/78d05g-aa3-r-datasheet.pdf)