component
LD1117AG-12-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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PCB Footprint
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Datasheet
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README
markdownLD1117AG-12-AA3-A-R
UTC Unisonic Tech · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-223-4
LD1117AG-12-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 return for the regulator. In fixed-output variants this pin is tied directly to system ground and carries the quiescent current (~5 mA typ, 10 mA max). Pin assignment 'A' places GND on pin 1 of the SOT-223. |
| 2 | VOUT | power_out | Regulated positive output, 1.2 V nominal (1.176-1.224 V) at up to 1 A for the A-suffix part. Requires an output capacitor (MLCC supported) for stability. This pin is electrically common to the SOT-223 tab. |
| 3 | VIN | power_in | Unregulated positive input, recommended up to 15 V (absolute max 18 V). Dropout voltage is ~1.20 V at 1 A, so VIN must exceed VOUT by at least the dropout across the load range. |
| TAB | VOUT | power_out | Thermal tab on the SOT-223, electrically connected to VOUT (pin 2). Solder to a copper pour for heat dissipation (θJC = 15 °C/W, θJA = 165 °C/W). |
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-12-AA3-A-RLD1117AG-12-AA3-A-RAB3LD1117AG-12-AA3-A-RTA3LD1117AG-12-AA3-A-RTF3LD1117AG-12-AA3-A-RTN3LD1117AG-12-AA3-A-RTNDLD1117AG-12-AA3-A-RTQ2LD1117AG-12-AA3-A-RTQ3LD1117AG-12-AA3-A-RS08
CAD (KiCad official)
- Symbol:
LD1117AG-12-AA3-A-R - Footprint:
Package_TO_SOT_SMD:SOT-223 - 3D model: SOT-223-4 (KiCad packages3D, STEP)
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).