LD1117AG-33-AA3-A-R
Public Unreviewedby Ray
UTC Unisonic Tech Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-223-4. Datasheet-verified pinout, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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README
markdownLD1117AG-33-AA3-A-R
UTC Unisonic Tech · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-223-4
LD1117AG-33-AA3-A-R from UTC Unisonic Tech, in a SOT-223-4. 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 | GND | power_in | Ground / reference return. For the fixed 3.3V version this pin is the device ground reference. Per Pin Assignment code 'A' (AA3 = SOT-223): pin 1 = G (GND/ADJ). |
| 2 | VOUT | power_out | Regulated output. Fixed 3.3V nominal, up to 1A (LD1117A variant). Requires an output capacitor for stability; MLCC supported. Also connected internally to the SOT-223 tab (pin 4). |
| 3 | VIN | power_in | Unregulated input supply. Absolute maximum 18V, recommended operating input voltage 15V max. Dropout typically 1.15V at 500mA, 1.20V at 1A. |
| 4 | VOUT | power_out | SOT-223 thermal tab, internally connected to VOUT (pin 2). Solder to a copper pour on the PCB to improve thermal dissipation (θJA = 165 °C/W in SOT-223). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | UTC Unisonic Tech |
| Package | SOT-223-4 |
| Category | PMIC |
| Pins | 4 |
Ordering variants
Same part, different packaging or reel option.
LD1117AG-33-AA3-A-RLD1117AG-33-AA3-A-RAB3LD1117AG-33-AA3-A-RTA3LD1117AG-33-AA3-A-RTF3LD1117AG-33-AA3-A-RTN3LD1117AG-33-AA3-A-RTNDLD1117AG-33-AA3-A-RT2QLD1117AG-33-AA3-A-RTQ2LD1117AG-33-AA3-A-RTQ3LD1117AG-33-AA3-A-RS08
CAD (KiCad official)
- Symbol:
LD1117AG-33-AA3-A-R - Footprint:
Package_TO_SOT_SMD:SOT-223 - 3D model: SOT-223-4 (KiCad packages3D, STEP)
3D model downloads
Two STEP files. Same geometry, different body top:
| File | Size | Use it when |
|---|---|---|
ld1117ag-33-aa3-a-r.step |
64 KB | You want the bare part, or you mark your own boards. |
ld1117ag-33-aa3-a-r-etched.step |
2.5 MB | You want the part with LD1117AG-33-AA3-A-R already on it. |
The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 634 faces against 75 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 (15 pp, sha256
f7f26a117cb07dc2, 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).