78L12G-AB3-R
Public Unreviewedby Ray
UTC Unisonic Tech Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-89. Datasheet-verified pinout, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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README
markdown78L12G-AB3-R
UTC Unisonic Tech · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-89
78L12G-AB3-R from UTC Unisonic Tech, in a SOT-89. 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 | OUT | power_out | Regulated +12V output. Typical VOUT=12.0V (11.52-12.48V at TJ=25°C); supplies up to 100mA. Bypass with 0.1µF ceramic close to the pin for stability and transient response. |
| 2 | GND | power_in | Ground / common return. On SOT-89 this is the large tab pin and provides the primary thermal path to the PCB copper. |
| 3 | IN | power_in | Unregulated DC input. For the 12V variant: 14.5V ≤ VIN ≤ 27V for regulation, 35V absolute maximum. Bypass with 0.33µF close to the pin to ensure stability. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | UTC Unisonic Tech |
| Package | SOT-89 |
| Category | PMIC |
| Pins | 3 |
Ordering variants
78L12G-AB3-R78L12G-AB3-R78L12G-AB3-C-R78L12G-AB3-R78L12G-AF5-R78L12G-AB3-R78L12G-S08-R78L12G-AB3-R78L12G-T92-B78L12G-AB3-R78L12G-T92-K78L12G-AB3-R78L12L-T92-B78L12G-AB3-R78L12L-T92-K78L12G-AB3-R78L12G-T9N-B78L12G-AB3-R78L12G-T9N-K78L12G-AB3-R78L12L-T9N-B78L12G-AB3-R78L12L-T9N-K
CAD (KiCad official)
- Symbol:
78L12G-AB3-R - Footprint:
Package_TO_SOT_SMD:SOT-89-3 - 3D model: SOT-89 (KiCad packages3D, STEP)
3D model downloads
Two STEP files. Same geometry, different body top:
| File | Size | Use it when |
|---|---|---|
78l12g-ab3-r.step |
57 KB | You want the bare part, or you mark your own boards. |
78l12g-ab3-r-etched.step |
1.6 MB | You want the part with 78L12G-AB3-R already on it. |
The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 417 faces against 42 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: UTC Unisonic Tech datasheet (8 pp, sha256
019cf0ff8e450efc, retrieved 2026-08-17, tier: manufacturer) - Extractor:
ds2sf(Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate. - CAD: KiCad official libraries (CC-BY-SA 4.0).