# LM7812CS2

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

LM7812CS2 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 pin; the datasheet limits input voltage to 35 V maximum (absolute maximum VIN) and specifies a 14.5 V to 35 V input range for the 12 V version. |
| 2 | GND | power_in | Ground reference pin for the regulator. |
| 3 | OUT | power_out | Regulated 12 V output pin (Vo 11.5 V to 12.5 V at Io = 0.5 A) with a maximum output current of 1.5 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 |
|---|---|---|---|---|---|---|---|
| Input voltage (absolute maximum) | VIN |  |  | 35 | V |  | 3 |
| Power dissipation (absolute maximum) | PD |  |  | 15 | W |  | 3 |
| Operating ambient temperature | Tamb | 0 |  | 125 | ℃ |  | 3 |
| Storage temperature | Tstg | -55 |  | 150 | ℃ |  | 3 |
| Lead temperature (soldering) | TLEAD |  |  | 245 | ℃ | soldering, 10 s | 3 |
| 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~1.5A | 5 |
| Input voltage | VI | 14.5 |  | 35 | V |  | 5 |
| Ripple rejection | Srip |  | 55 |  | dB | VI=15~25V, Io=100mA, f=120Hz | 5 |
| Maximum output current | IOM |  | 1.5 |  | A |  | 5 |
| Output voltage temperature coefficient | ∆V/T |  | -0.8 |  | mV/℃ | Io=5mA, Tj=0~85℃ | 5 |
| Output noise voltage | VNO |  | 75 |  | µV | f=10Hz~100kHz | 5 |

## CAD (KiCad official)

- Symbol: `LM7812CS2`
- Footprint: `Package_TO_SOT_SMD:TO-263-2`
- 3D model: TO-263-2 (KiCad packages3D, STEP)
- 3D model files: `lm7812cs2-etched.step` / `lm7812cs2-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm7812cs2.step` / `lm7812cs2.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/8603358954911387648) (11 pp, sha256 `be96532d928e76ec`, retrieved 2026-10-18, 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/lm7812cs2-datasheet.pdf)