# LM7812S2

**HGSEMI** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · TO-263-2

LM7812S2 from HGSEMI, in a TO-263-2. 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 | Vcc | power_in | Unregulated input supply to the regulator; for the LM7812 the datasheet gives an input range of 14.5 V to 35 V and an absolute maximum input voltage of 35 V. |
| 2 | GND | power_in | Ground reference pin for the regulator, shared between input and output return. |
| 3 | OUT | power_out | Regulated 12 V output (Vo 11.5 V to 12.5 V at Io = 0.5 A) with a maximum output current IOM of 1.2 A. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | HGSEMI |
| Package | TO-263-2 |
| 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 | 11.5 | 12 | 12.5 | V | VI=19V，Io=0.5A，PD≤15W | 5 |
| Line regulation | REGv |  | 3 | 120 | mV | VI=16~22V | 5 |
| Load regulation | REGL |  | 12 | 240 | mV | Io=5mA~1.2A | 5 |
| Input voltage | VI | 14.5 |  | 35 | V |  | 5 |
| Input voltage (absolute maximum) | VIN |  |  | 35 | V |  | 3 |
| Power dissipation | PD |  |  | 15 | W |  | 3 |
| Operating ambient temperature | Tamb | 0 |  | 125 | ℃ |  | 3 |
| Storage temperature | Tstg | -55 |  | 150 | ℃ |  | 3 |
| Lead temperature (soldering 10s) | TLEAD |  |  | 245 | ℃ |  | 3 |
| Ripple rejection | Srip |  | 55 |  | dB | VI=15~25V，Io=100mA，f=120Hz | 5 |
| Maximum output current | IOM |  | 1.2 |  | A |  | 5 |
| Output voltage temperature coefficient | ∆V/T |  | -0.8 |  | mV/℃ | Io=5mA，Tj=0~125℃ | 5 |
| Output noise voltage | VNO |  | 75 |  | µV | f=10Hz~100kHz | 5 |
| Junction-to-ambient thermal resistance (TO-263 column) | RθJA |  | 44.8 |  | °C/W |  | 3 |
| Junction-to-case (top) thermal resistance (TO-263 column) | RθJC(top) |  | 45.6 |  | °C/W |  | 3 |
| Junction-to-board thermal resistance (TO-263 column) | RθJB |  | 24.4 |  | °C/W |  | 3 |
| Junction-to-case (bottom) thermal resistance (TO-263 column) | RθJC(bot) |  | 1.5 |  | °C/W |  | 3 |
| Junction-to-top characterization parameter (TO-263 column) | ΨJT |  | 11.2 |  | °C/W |  | 3 |
| Junction-to-board characterization parameter (TO-263 column) | ΨJB |  | 23.4 |  | °C/W |  | 3 |

## CAD (KiCad official)

- Symbol: `LM7812S2`
- Footprint: `Package_TO_SOT_SMD:TO-263-2`
- 3D model: TO-263-2 (KiCad packages3D, STEP)
- 3D model files: `lm7812s2-etched.step` / `lm7812s2-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm7812s2.step` / `lm7812s2.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/8763467778315829248) (11 pp, sha256 `7c51292380972d4a`, retrieved 2026-10-17, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **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/lm7812s2-datasheet.pdf)