LD1117AS33TR

@@ -0,0 +1,51 @@+# LD1117AS33TR++**STMicroelectronics** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-223-4++LD1117AS33TR from STMicroelectronics, 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 | ADJ/GND | power_in | Ground reference pin for the fixed 3.3 V version (labeled ADJ/GND because the same die is used for the adjustable variant). Tie directly to system ground for the LD1117AS33TR. Quiescent current is typically 5 mA. |+| 2 | VOUT | power_out | Regulated 3.3 V output (typ 3.3 V, 3.234-3.366 V at 25 °C, 10 mA). Sources up to 1 A (min 1000 mA, typ 1200 mA short-circuit). Requires a ≥10 µF output capacitor for loop stability. Internally connected to the exposed metal tab. |+| 3 | VIN | power_in | Unregulated DC input supply. Operating input voltage up to 10 V (absolute max 15 V). Minimum VIN for 3.3 V regulation is ~4.75 V (dropout typ 1.15 V at 1 A). A 100 nF input decoupling capacitor is recommended. |+| 4 | TAB | power_out | Large SOT-223 heat-sink tab, internally shorted to VOUT. Provides the primary thermal path (RthJC = 15 °C/W); should be soldered to a copper area on the PCB that is also the VOUT net. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | STMicroelectronics |+| Package | SOT-223-4 |+| Category | PMIC |+| Pins | 4 |++## Ordering variants++- `LD1117AS33TRAS33TR`+- `LD1117AS33TRASTR`+- `LD1117AS33TRAS12TR`+- `LD1117AS33TRAS18TR`+- `LD1117AS33TRADT33TR`+- `LD1117AS33TRADT-TR`+- `LD1117AS33TRADT12TR`+- `LD1117AS33TRADT18TR`+- `LD1117AS33TRAV33`++## CAD (KiCad official)++- Symbol: `LD1117AS33TR`+- 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:** [STMicroelectronics datasheet](https://www.st.com/resource/en/datasheet/ld1117as33tr.pdf) (24 pp, sha256 `c2dd41daa75f2827`, 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/ld1117as33tr-datasheet.pdf)

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