# LM78M05ADT

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

LM78M05ADT from HGSEMI, in a TO-252. 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 | VIN | power_in | Input voltage pin (INPUT); absolute maximum input voltage is 35 V for 5 V to 18 V output versions, and the LM78M05A is specified for VI = 7 V to 20 V over its output-voltage range. |
| 2 | GND | power_in | Ground pin, the common reference for the regulator, connected internally to the tab. |
| 3 | VOUT | power_out | Regulated output pin (OUTPUT) of 5 V (4.8 V to 5.2 V at TJ = +25 °C) for the LM78M05A, delivering up to 1 A. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | HGSEMI |
| Package | TO-252 |
| Category | Power Management (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 | VO | 4.8 | 5 | 5.2 | V | TJ = +25℃ | 3 |
| Output Voltage | VO | 4.75 | 5 | 5.25 | V | IO = 5mA to 1A, VI = 7V to 20V | 3 |
| Line Regulation | VO |  |  | 100 | mV | IO = 200mA, TJ = +25℃, VI = 7V to 25V | 3 |
| Line Regulation | VO |  |  | 50 | mV | IO = 200mA, TJ = +25℃, VI = 8V to 25V | 3 |
| Load Regulation | VO |  |  | 100 | mV | IO = 5mA to 0.5A, TJ = +25℃ | 3 |
| Load Regulation | VO |  |  | 50 | mV | IO = 5mA to 200mA, TJ = +25℃ | 3 |
| Quiescent Current | IQ |  | 4 | 6 | mA | TJ = +25℃ | 3 |
| Quiescent Current Change | IQ |  |  | 0.5 | mA | IO = 5mA to 350mA | 3 |
| Quiescent Current Change | IQ |  |  | 0.8 | mA | IO = 200mA, VI = 8V to 25V | 3 |
| Input Voltage | VI |  |  | 35 | V | for VO = 5V to 18V | 2 |
| Operating Junction Temperature Range | TOPR | 0 |  | 125 | ℃ |  | 2 |
| Storage Temperature Range | TSTG | -65 |  | 150 | ℃ |  | 2 |
| Output Voltage Drift | V/T |  | -0.5 |  | mV/℃ | IO = 5mA, TJ = -40 to +85℃ | 3 |
| Output Noise Voltage | VN |  | 40 |  | µV/Vo | f = 10Hz to 100kHz | 3 |
| Ripple Rejection | RR |  | 80 |  | dB | f = 120Hz, IO = 300mA, VI = 8V to 18V, TJ = +25℃ | 3 |
| Dropout Voltage | VD |  | 2 |  | V | TJ = +25℃, IO = 500mA | 3 |
| Short Circuit Current | ISC |  | 300 |  | mA | TJ = +25℃, VI = 35V | 3 |
| Peak Current | IPK |  | 700 |  | mA | TJ = +25℃ | 3 |
| Thermal Resistance Junction-Case | RθJC |  | 2.5 |  | ℃/W | TO-252-2, Tc = +25℃ | 2 |
| Thermal Resistance Junction-Air | RθJA |  | 92 |  | ℃/W | TO-252-2, Ta = +25℃ | 2 |

## CAD (KiCad official)

- Symbol: `LM78M05ADT`
- Footprint: `Package_TO_SOT_SMD:TO-252-2`
- 3D model: TO-252 (KiCad packages3D, STEP)
- 3D model files: `lm78m05adt-etched.step` / `lm78m05adt-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm78m05adt.step` / `lm78m05adt.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [HGSEMI datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603083990253383680) (11 pp, sha256 `99c9ca630430d237`, retrieved 2026-10-19, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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/lm78m05adt-datasheet.pdf)