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LD1117AG-33-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+52@@ -0,0 +1,52 @@+# LD1117AG-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++- `LD1117AG-33-AA3-A-RAA3`+- `LD1117AG-33-AA3-A-RAB3`+- `LD1117AG-33-AA3-A-RTA3`+- `LD1117AG-33-AA3-A-RTF3`+- `LD1117AG-33-AA3-A-RTN3`+- `LD1117AG-33-AA3-A-RTND`+- `LD1117AG-33-AA3-A-RT2Q`+- `LD1117AG-33-AA3-A-RTQ2`+- `LD1117AG-33-AA3-A-RTQ3`+- `LD1117AG-33-AA3-A-RS08`++## CAD (KiCad official)++- Symbol: `LD1117AG-33-AA3-A-R`+- Footprint: `Package_TO_SOT_SMD:SOT-223-3_TabPin2`+- 3D model: SOT-223-4 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [UTC Unisonic Tech datasheet](https://datasheet.lcsc.com/datasheet/pdf/8df78a8eb2f8d095670f5827599b77fe.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-33-aa3-a-r-datasheet.pdf)
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