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LD1117AG-12-AA3-A-R
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UTC Unisonic Tech Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-223-4. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.
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README.mdadded+53@@ -0,0 +1,53 @@+# LD1117AG-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-R`+- `LD1117AG-12-AA3-A-RAB3`+- `LD1117AG-12-AA3-A-RTA3`+- `LD1117AG-12-AA3-A-RTF3`+- `LD1117AG-12-AA3-A-RTN3`+- `LD1117AG-12-AA3-A-RTND`+- `LD1117AG-12-AA3-A-RTQ2`+- `LD1117AG-12-AA3-A-RTQ3`+- `LD1117AG-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](docs/ld1117ag-12-aa3-a-r-datasheet.pdf) (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).++[Datasheet PDF](docs/ld1117ag-12-aa3-a-r-datasheet.pdf)
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