L78L18ACUTR

@@ -0,0 +1,46 @@+# L78L18ACUTR++**STMicroelectronics** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-89-3++L78L18ACUTR from STMicroelectronics, in a SOT-89-3. 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 | VOUT | power_out | Regulated +18 V output (±4% for 'AC' grade). Delivers up to 100 mA with adequate heat-sinking. A 0.1 µF ceramic capacitor to GND is recommended at the pin to improve transient response and stability. |+| 2 | GND | power_in | Common ground reference for input and output. The SOT-89 large center tab is also connected to GND and serves as the primary thermal path to the PCB copper (Rth(j-c) = 15 °C/W, Rth(j-a) ≈ 55 °C/W with 6 cm² copper). |+| 3 | VIN | power_in | Unregulated positive DC input. For an 18 V output the input voltage must remain within the 35 V absolute maximum (VO = 12-15 V rating in Table 1 extends to 40 V for VO = 18-24 V devices, so VIN(max) = 40 V for the 18 V option). Dropout voltage is typically 1.7 V. A 0.33 µF capacitor from VIN to GND is recommended if the regulator is far from the power-supply filter. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | STMicroelectronics |+| Package | SOT-89-3 |+| Category | PMIC |+| Pins | 3 |++## Ordering variants++- `L78L18ACUTRUTR`+- `L78L18ACUTRZ`+- `L78L18ACUTR-AP`+- `L78L18ACUTRD`+- `L78L18ACUTRD13TR`++## CAD (KiCad official)++- Symbol: `L78L18ACUTR`+- Footprint: `Package_TO_SOT_SMD:SOT-89-3`+- 3D model: SOT-89-3 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [STMicroelectronics datasheet](docs/l78l18acutr-datasheet.pdf) (40 pp, sha256 `8b73c521b7f1b36e`, retrieved 2026-08-17, tier: lcsc)+- **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/l78l18acutr-datasheet.pdf)

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