# LD1117AG-50-AA3-D-R

**UTC Unisonic Tech** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-223

LD1117AG-50-AA3-D-R from UTC Unisonic Tech, in a SOT-223. 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 | VIN | power_in | Unregulated positive input supply. Recommended operating range up to 15V (abs max 18V). For the 5.0V variant, VIN must be at least ~6.5V for full regulation (dropout ~1.2V at 1A). Bypass with a 10uF capacitor close to the pin. |
| 2 | GND | power_in | Device ground reference. On fixed-output versions this pin sets the 0V reference for the internal error amplifier. Should be tied to system ground with a low-impedance return path. |
| 3 | VOUT | power_out | Regulated 5.0V output (tolerance +/-2%, 4.900V min / 5.100V max). Supplies up to 1.0A on the 'A' variant. Requires a minimum 10uF output capacitor for stability; MLCC supported per the ESR SOA graph. |
| 4 | TAB | power_out | Large SOT-223 heat-slug tab, internally connected to VOUT. Solder to a copper pour tied to the VOUT net for thermal dissipation (theta_JA = 165 C/W for SOT-223). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | UTC Unisonic Tech |
| Package | SOT-223 |
| Category | PMIC |
| Pins | 4 |

## Ordering variants

- `LD1117AG-50-AA3-D-RAA3-A-R`
- `LD1117AG-50-AA3-D-RAA3-B-R`
- `LD1117AG-50-AA3-D-RAA3-C-R`
- `LD1117AG-50-AA3-D-R`
- `LD1117AG-50-AA3-D-RAA3-A-T`
- `LD1117AG-50-AA3-D-RAA3-B-T`
- `LD1117AG-50-AA3-D-RAA3-C-T`
- `LD1117AG-50-AA3-D-RAA3-D-T`
- `LD1117AG-50-AA3-D-RAB3`
- `LD1117AG-50-AA3-D-RTA3`
- `LD1117AG-50-AA3-D-RTF3`
- `LD1117AG-50-AA3-D-RTN3`
- `LD1117AG-50-AA3-D-RTND`
- `LD1117AG-50-AA3-D-RT2Q`
- `LD1117AG-50-AA3-D-RTQ2`
- `LD1117AG-50-AA3-D-RTQ3`
- `LD1117AG-50-AA3-D-RAE5-G`
- `LD1117AG-50-AA3-D-RAF5-G`
- `LD1117AG-50-AA3-D-RS08`
- `LD1117AG-50-AA3-D-RSH2`
- `LD1117AG-50-AA3-D-RP5060-R`

## CAD (KiCad official)

- Symbol: `LD1117AG-50-AA3-D-R`
- Footprint: `Package_TO_SOT_SMD:SOT-223-3_TabPin2`
- 3D model: SOT-223 (KiCad packages3D, STEP)
- 3D model files: `ld1117ag-50-aa3-d-r-etched.step` / `ld1117ag-50-aa3-d-r-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ld1117ag-50-aa3-d-r.step` / `ld1117ag-50-aa3-d-r.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [UTC Unisonic Tech datasheet](docs/ld1117ag-50-aa3-d-r-datasheet.pdf) (None pp, sha256 `cc56230fa080b180`, retrieved 2026-08-17, tier: lcsc)
- **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).

[Datasheet PDF](docs/ld1117ag-50-aa3-d-r-datasheet.pdf)