# LM7808T

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

LM7808T from HGSEMI, in a TO-220. 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; for the LM7808 the datasheet gives an input voltage range of 11 V to 35 V, and the absolute maximum input voltage is 35 V. |
| 2 | GND | power_in | Ground (common) reference pin for the regulator. |
| 3 | OUT | power_out | Regulated 8 V output (7.7 V to 8.3 V at VI=14 V, Io=0.5 A) with a maximum output current IOM of 1.2 A. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | HGSEMI |
| Package | TO-220 |
| 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 |
|---|---|---|---|---|---|---|---|
| 输出电压 (Output voltage) | Vo | 7.7 | 8 | 8.3 | V | VI=14V, Io=0.5A, PD≤15W | 4 |
| 电压调整率 (Line regulation) | REGv |  | 5 | 160 | mV | VI=11~22V | 4 |
| 负载调整率 (Load regulation) | REGL |  | 10 | 160 | mV | Io=5mA~1.2A | 4 |
| 输入电压 (Input voltage) | VI | 11 |  | 35 | V |  | 4 |
| 纹波抑制比 (Ripple rejection) | Srip |  | 56 |  | dB | VI=12~25V, Io=100mA, f=120Hz | 4 |
| 最大输出电流 (Maximum output current) | IOM |  | 1.2 |  | A |  | 4 |
| 输出电压温度系数 (Output voltage temperature coefficient) | ∆V/T |  | 0.8 |  | mV/℃ | Io=5mA, Tj=0~125℃ | 4 |
| 输出噪声电压 (Output noise voltage) | VNO |  | 52 |  | μV | f=10Hz~100kHz | 4 |
| 输入电压 (Input voltage, absolute maximum) | VIN |  |  | 35 | V |  | 3 |
| 功耗 (Power dissipation) | PD |  |  | 15 | W |  | 3 |
| 工作环境温度 (Operating ambient temperature) | Tamb | 0 |  | 125 | ℃ |  | 3 |
| 贮存温度 (Storage temperature) | Tstg | -55 |  | 150 | ℃ |  | 3 |
| 引脚温度 (Lead temperature, soldering) | TLEAD |  |  | 245 | ℃ | soldering 10s | 3 |
| 结至环境热阻 (Junction-to-ambient thermal resistance) | RθJA |  | 23.9 |  | °C/W | TO-220 package | 3 |
| 结至外壳（顶部）热阻 (Junction-to-case top thermal resistance) | RθJC(top) |  | 16.7 |  | °C/W | TO-220 package | 3 |
| 结至电路板热阻 (Junction-to-board thermal resistance) | RθJB |  | 5.3 |  | °C/W | TO-220 package | 3 |
| 结至外壳（底部）热阻 (Junction-to-case bottom thermal resistance) | RθJC(bot) |  | 1.7 |  | °C/W | TO-220 package | 3 |
| 结至顶部特征参数 (Junction-to-top characterization parameter) | ΨJT |  | 3.2 |  | °C/W | TO-220 package | 3 |
| 结至电路板特征参数 (Junction-to-board characterization parameter) | ΨJB |  | 5.3 |  | °C/W | TO-220 package | 3 |

## CAD (KiCad official)

- Symbol: `LM7808T`
- Footprint: `Package_TO_SOT_THT:TO-220-3_Vertical`
- 3D model: TO-220 (KiCad packages3D, STEP)
- 3D model files: `lm7808t-etched.step` / `lm7808t-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm7808t.step` / `lm7808t.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/8757038663820038144) (11 pp, sha256 `b569535747cdcefd`, retrieved 2026-10-20, 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/lm7808t-datasheet.pdf)