# 78L09A

**Shikues** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-89

78L09A from Shikues, in a SOT-89. 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 | OUT | power_out | Regulated output of the 78L09A, specified at 9.0 V typical (8.55 V to 9.45 V over 1 mA to 140 mA), with a maximum output current of 200 mA. |
| 2 | GND | power_in | Ground reference pin of the regulator; the datasheet gives no further electrical limits for this pin. |
| 3 | IN | power_in | Unregulated input to the regulator, with an absolute maximum input voltage of 30 V; the 78L09A electrical characteristics are specified at VI = 15 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Shikues |
| Package | SOT-89 |
| 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 | 8.64 | 9 | 9.36 | V | Tj=25C | 3 |
| Output Voltage | VO | 8.55 |  | 9.45 | V | 11VVI24V, IO=1mA~80mA | 3 |
| Load Regulation | Vo |  | 27 | 80 | mV | Tj=25C,IO=1mA~200mA | 3 |
| Load Regulation | Vo |  | 18 | 40 | mV | Tj=25C,IO=1mA~80mA | 3 |
| Line Regulation | Vo |  | 18 | 225 | mV | 11.5VVI23V,Tj=25C | 3 |
| Line Regulation | Vo |  | 9 | 150 | mV | 12VVI23V,Tj=25C | 3 |
| Quiescent Current | Iq |  | 2 | 5.5 | mA | Tj=25C | 3 |
| Quiescent Current Change | Iq |  |  | 1.5 | mA | 12VVI23V | 3 |
| Quiescent Current Change | Iq |  |  | 0.1 | mA | 1mAVI80mA | 3 |
| Output Noise Voltage | VN |  |  | 60 | V | 10Hzf100kHz, Tj=25C | 3 |
| Ripple Rejection | RR | 36 | 45 |  | dB | 14VVI23V,f=120Hz,Tj=25C | 3 |
| Dropout Voltage | Vd |  |  | 1.7 | V |  | 3 |
| Temperature coefficient of Vo | Vo/T |  | 0.85 |  | mV/C | Io=5mA | 3 |
| Input voltage | VIN |  |  | 30 | V |  | 1 |
| Output Current | IOUT |  |  | 200 | mA |  | 1 |
| Junction Temperature | TJ |  |  | 125 | ℃ |  | 1 |
| Operating Temperature | TOPR | -40 |  | 120 | ℃ |  | 1 |
| Storage Temperature Range | TSTG | -40 |  | 150 | ℃ |  | 1 |

## CAD (KiCad official)

- Symbol: `78L09A`
- Footprint: `Package_TO_SOT_SMD:SOT-89-3`
- 3D model: SOT-89 (KiCad packages3D, STEP)
- 3D model files: `78l09a-etched.step` / `78l09a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `78l09a.step` / `78l09a.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Shikues datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603322981951426560) (6 pp, sha256 `a9adfda5100d9ed3`, 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/78l09a-datasheet.pdf)