LD3985M33R

@@ -0,0 +1,48 @@+# LD3985M33R++**STMicroelectronics** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-23-5L++LD3985M33R from STMicroelectronics, in a SOT-23-5L. 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 | VI | power_in | Input voltage of the LDO. Operating range 2.5 V to 6 V (absolute max -0.3 to 6 V; withstands 6.5 V non-repetitive spike for 200 ms). Decouple with 1 µF ceramic capacitor to GND. |+| 2 | GND | power_in | Common ground reference for the regulator. |+| 3 | VINH | input | Inhibit (enable) input. ON mode when VINH >= 1.2 V, OFF mode when VINH <= 0.4 V. Absolute max -0.3 V to VI+0.3 V. Input leakage ±1 nA typ. Must not be left floating (no internal pull-up/pull-down). |+| 4 | BYPASS | passive | Reference bypass pin. Connect an external capacitor (typically 10 nF) to GND to filter internal reference noise and minimize output noise voltage (30 µVRMS over 10 Hz-100 kHz). |+| 5 | VO | power_out | Regulated output voltage of the LDO (3.3 V nominal for the M33 option). Delivers up to 150 mA guaranteed (300 mA min peak, 550 mA typ). Requires a low-ESR ceramic output capacitor (Co >= 1 µF, ESR 5 mΩ-5 Ω). |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | STMicroelectronics |+| Package | SOT-23-5L |+| Category | PMIC |+| Pins | 5 |++## Ordering variants++- `LD3985M33RM`+- `LD3985M33RMTR`+- `LD3985M33RXX`+- `LD3985M33RXXTR`+- `LD3985M33RJ`++## CAD (KiCad official)++- Symbol: `LD3985M33R`+- Footprint: `Package_TO_SOT_SMD:SOT-23-5`+- 3D model: SOT-23-5L (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [STMicroelectronics datasheet](https://www.st.com/resource/en/datasheet/ld3985m33r.pdf) (22 pp, sha256 `c78962c126412ffb`, 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/ld3985m33r-datasheet.pdf)

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