# LM7912CT

**HGSEMI** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · TO-220-3

LM7912CT from HGSEMI, in a TO-220-3. 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 | GND | power_in | Common ground reference for the regulator; the datasheet states no separate voltage or current limit for this pin. |
| 2 | Input | power_in | Unregulated negative input voltage with an absolute maximum of -35 V at TJ=25°C, and output regulation is specified for inputs from -14.5 V to -21 V. |
| 3 | Output | power_out | Regulated -12 V output, specified at -11.52 V to -12.48 V for 5 mA to 1.0 A load, with output current rated in excess of 1.5 A. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | HGSEMI |
| Package | TO-220-3 |
| 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 | -11.52 |  | -12.48 | V | -14.5V ≤ VIN ≤ -21V; 5.0mA ≤ IO ≤ 1.0 A; TJ=25°C (CIN=2.2µF, CO=1.0µF) | 4 |
| Line Regulation | ∆UV |  |  | 114 | mV | IO = 100mA, -14.5V ≤ VIN ≤ -30V | 4 |
| Line Regulation | ∆UV |  |  | 58.5 | mV | IO = 100mA, -16V ≤ VIN ≤ -22V | 4 |
| Line Regulation | ∆UV |  |  | 228 | mV | IO = 500mA, -14.5V ≤ VIN ≤ -30V | 4 |
| Load Regulation | ∆UI |  |  | 228 | mV | 5.0mA ≤ IO ≤ 1.5 A | 4 |
| Load Regulation | ∆UI |  |  | 114 | mV | 250mA ≤ IO ≤ 750mA | 4 |
| Quiescent Current | IB |  |  | 7.8 | mA |  | 4 |
| Quiescent Current Change | ∆IB |  |  | 1.25 | mA | -14.5V ≤ VIN ≤ -30V | 4 |
| Quiescent Current Change | ∆IB |  |  | 0.48 | mA | 5.0mA ≤ IO ≤ 1.5 A | 4 |
| Output voltage tolerance (Features) |  | -4 |  | 4 | % |  | 1 |
| Maximum input voltage |  |  |  | -35 | V | TJ = 25°C | 2 |
| Maximum operating junction temperature |  |  |  | 125 | ℃ |  | 2 |
| Operating Temperature Range |  | 0 |  | 125 | ℃ |  | 2 |
| Lead Temperature (TL) | TL |  |  | 245 | ℃ | Soldering, 10 seconds | 2 |

## CAD (KiCad official)

- Symbol: `LM7912CT`
- Footprint: `Package_TO_SOT_THT:TO-220-3_Vertical`
- 3D model: TO-220-3 (KiCad packages3D, STEP)
- 3D model files: `lm7912ct-etched.step` / `lm7912ct-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm7912ct.step` / `lm7912ct.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/8602994230281453568) (9 pp, sha256 `fe0f5995fcb9d116`, retrieved 2026-10-19, 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/lm7912ct-datasheet.pdf)