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LDS3985M18R

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STMicroelectronics Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-23-5L. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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Contents

README

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LDS3985M18R

STMicroelectronics · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-23-5L

LDS3985M18R 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 LDO input voltage. Operating range 2.5 V to 6 V (absolute max -0.3 V to 6 V; non-repetitive spike up to 6.5 V for 200 ms). Bypass with a low ESR ceramic capacitor (>= 1 uF).
2 GND power_in Common ground reference for the regulator and its external input/output/bypass capacitors.
3 VINH input Inhibit/enable input. ON mode when VINH >= 1.2 V (typ. logic-high threshold 1.4 V), OFF mode when VINH <= 0.4 V. Inhibit input current +/-1 nA max. Do not leave floating; it is not internally pulled up or down.
4 Bypass passive Reference-voltage bypass pin. Connect an external capacitor (typ. 33 nF) to GND to minimize output noise (30 uVrms over 10 Hz-100 kHz with Cbyp = 33 nF).
5 VO power_out LDO regulated output, fixed 1.8 V for the M18R option. Guaranteed load current up to 300 mA. Requires an output capacitor Co = 2.2 uF to 22 uF with ESR 5 mOhm to 5 Ohm for stability.

Key specifications

Parameter Value
Manufacturer STMicroelectronics
Package SOT-23-5L
Category PMIC
Pins 5

Ordering variants

Same part, different packaging or reel option.

  • LDS3985M18RM15R
  • LDS3985M18R
  • LDS3985M18RM25R
  • LDS3985M18RM28R
  • LDS3985M18RM30R
  • LDS3985M18RM33R
  • LDS3985M18RM50R
  • LDS3985M18RPU15R
  • LDS3985M18RPU28R
  • LDS3985M18RPU33R
  • LDS3985M18RPU18RY
  • LDS3985M18RPU33RY

CAD (KiCad official)

  • Symbol: LDS3985M18R
  • Footprint: Package_TO_SOT_SMD:SOT-23-5
  • 3D model: SOT-23-5L (KiCad packages3D, STEP)
  • 3D model files: lds3985m18r-etched.step / lds3985m18r-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lds3985m18r.step / lds3985m18r.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: STMicroelectronics datasheet (21 pp, sha256 72544d5f7fa35736, 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