# L78L12ABZ

**STMicroelectronics** · Voltage Reference · TO-92-3

L78L12ABZ from STMicroelectronics, in a TO-92-3. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | VOUT | power_out | Regulated positive output voltage pin, nominal 12 V (±4% for the A grade), capable of delivering up to 100 mA output current with a 0.1 µF output capacitor recommended. |
| 2 | GND | power_in | Common/ground reference pin for the regulator. |
| 3 | VIN | power_in | Unregulated DC input voltage pin, rated up to 35 V absolute maximum for the 12 V output version, with a 0.33 µF input capacitor recommended if the device is located far from the filter capacitor. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | TO-92-3 |
| 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 | 11.5 | 12 | 12.5 | V | TJ = 25 °C | 12 |
| Output voltage | VO | 11.4 |  | 12.6 | V | IO = 1 to 40 mA, VI = 14.5 to 27 V | 12 |
| Line regulation | ΔVO |  |  | 250 | mV | VI = 14.5 to 27 V, TJ = 25 °C | 12 |
| Line regulation | ΔVO |  |  | 200 | mV | VI = 16 to 27 V, TJ = 25 °C | 12 |
| Load regulation | ΔVO |  |  | 100 | mV | IO = 1 to 100 mA, TJ = 25 °C | 12 |
| Load regulation | ΔVO |  |  | 50 | mV | IO = 1 to 40 mA, TJ = 25 °C | 12 |
| Quiescent current | Id |  |  | 6.5 | mA | TJ = 25 °C | 12 |
| Quiescent current | Id |  |  | 6 | mA | TJ = 125 °C | 12 |
| Quiescent current change | ΔId |  |  | 0.1 | mA | IO = 1 to 40 mA | 12 |
| Quiescent current change | ΔId |  |  | 1.5 | mA | VI = 16 to 27 V | 12 |
| Supply voltage rejection | SVR | 37 | 42 |  | dB | VI = 15 to 25 V, f = 120 Hz, IO = 40 mA, TJ = 25 °C | 12 |
| Dropout voltage | Vd |  |  | 1.7 | V |  | 12 |
| Output noise voltage | eN |  | 80 |  | µV | B = 10 Hz to 100 kHz, TJ = 25 °C | 12 |
| DC input voltage | VI |  |  | 35 | V | VO = 12 to 15 V | 4 |
| Output current | IO |  |  | 100 | mA |  | 4 |
| Storage temperature range | TSTG | -65 |  | 150 | °C |  | 4 |
| Operating junction temperature range | TOP | -40 |  | 125 | °C | for L78LxxAB | 4 |
| Thermal resistance junction-ambient | RthJA |  |  | 200 | °C/W | TO-92 package | 4 |

## CAD (KiCad official)

- Symbol: `L78L12ABZ`
- Footprint: `Package_TO_SOT_THT:TO-92_Inline`
- 3D model: TO-92-3 (KiCad packages3D, STEP)
- 3D model files: `l78l12abz-etched.step` / `l78l12abz-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `l78l12abz.step` / `l78l12abz.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [STMicroelectronics datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588945055796613120) (40 pp, sha256 `19755abefe19a8b0`, retrieved 2026-09-23, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.2`, primary `claude-sonnet-5` (text+vision), consensus `claude-opus-4-8` (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/l78l12abz-datasheet.pdf)