# LM78L09

**HTC Korea TAEJIN Tech** · Linear Voltage Regulators (LDO) · TO-92-3

LM78L09 from HTC Korea TAEJIN Tech, in a TO-92-3. 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 | VOUT | power_out | Regulated 9V output of the LM78L09, delivering up to 100mA of output current. |
| 2 | GND | power_in | Ground reference for input and output; bypass capacitors should be placed as close to the regulator as possible. |
| 3 | VIN | power_in | Unregulated input voltage, recommended 11.5V to 24V for the LM78L09 with an absolute maximum input of 30V for the LM78L05 to LM78L10 group. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | HTC Korea TAEJIN Tech |
| Package | TO-92-3 |
| Category | Power Management ICs |
| 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 (25 °C) | VOUT | 8.6 | 9 | 9.4 | V | 25℃; 1mA ≤ Io ≤ 40mA; 12V ≤ VIN ≤ 24V | 7 |
| Output Voltage (over temperature) | VOUT | 8.55 | 9 | 9.45 | V | -30℃ ~ 125℃; 1mA ≤ Io ≤ 70mA; 12V ≤ VIN ≤ 24V | 7 |
| Line Regulation | ΔVLINE |  | 45 | 175 | mV | 12V ≤ VIN ≤ 24V | 7 |
| Line Regulation | ΔVLINE |  | 40 | 125 | mV | 13V ≤ VIN ≤ 24V; 25℃ | 7 |
| Load Regulation | ΔVLOAD |  | 19 | 90 | mV | 1mA ≤ Io ≤ 100mA | 7 |
| Load Regulation | ΔVLOAD |  | 11 | 40 | mV | 1mA ≤ Io ≤ 40mA; 25℃ | 7 |
| Bias Current (25 °C) | IB |  | 4.1 | 6 | mA | 25℃ | 7 |
| Bias Current (125 °C) | IB |  |  | 5.5 | mA | 125℃ | 7 |
| Bias Current Change | ΔIB |  |  | 1.5 | mA | 13V ≤ VIN ≤ 24V | 7 |
| Bias Current Change | ΔIB |  |  | 0.1 | mA | 1mA ≤ Io ≤ 40mA; -30℃ ~ 125℃ | 7 |
| Output Noise Voltage | VN |  | 58 |  | uV | 10Hz ≤ f ≤ 100kHz; 25℃ | 7 |
| Ripple Rejection | RR | 38 | 45 |  | dB | 15V ≤ VIN ≤ 25V, f=120Hz; 25℃ | 7 |
| Dropout Voltage | VD |  | 1.7 |  | V | 25℃ | 7 |
| Input Voltage (absolute maximum, LM78L05 ~ LM78L10) | VIN |  |  | 30 | V | LM78L05 ~ LM78L10 family rating | 1 |
| Maximum Power Dissipation | PDMax |  |  | 0.77 | W | TA = 25°C, TO-92 | 1 |
| Thermal Resistance Junction-To-Ambient | θJA |  |  | 162 | ℃/W | TO-92 | 1 |
| Lead Temperature (Soldering) | TSOL |  |  | 260 | ℃ | 10 sec | 1 |
| Storage Temperature Range | TSTG | -65 |  | 150 | ℃ |  | 1 |
| Operating Junction Temperature Range (absolute maximum) | TJOPR | -40 |  | 150 | ℃ |  | 1 |
| Input Voltage (recommended) | VIN | 11.5 |  | 24 | V | LM78L09 | 2 |
| Output Current | Io | 100 |  | 100 | mA |  | 2 |
| Operating Virtual Junction Temperature | TJ | -40 |  | 125 | ℃ |  | 2 |

## CAD (KiCad official)

- Symbol: `LM78L09`
- Footprint: `Package_TO_SOT_THT:TO-92_Inline`
- 3D model: TO-92-3 (KiCad packages3D, STEP)
- 3D model files: `lm78l09-etched.step` / `lm78l09-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm78l09.step` / `lm78l09.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [HTC Korea TAEJIN Tech datasheet](docs/lm78l09-datasheet.pdf) (11 pp, sha256 `b5b1ed6d19d1619d`, retrieved 2026-11-05, 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/lm78l09-datasheet.pdf)