LDK320AM33R from STMicroelectronics, in a SOT-23-5. 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	IN	power_in	Input voltage of the LDO. Operating range 2.5 V to 18 V (abs max 20 V). Bypass to GND with a >=1 uF ceramic capacitor.
2	GND	power_in	Common ground reference. All voltages in the datasheet are referred to this pin.
3	EN	input	Enable logic input: low = shutdown (<0.4 V, IQ < 1 uA), high = active (>1.2 V). Input current ~0.1 nA typ. Absolute max -0.3 V to Vin+0.3 V. Do not leave floating.
4	NC	unconnected	Not connected on the fixed-output version (LDK320AM33R is the 3.3 V fixed variant). This pin serves as the ADJ feedback input only on the adjustable LDK320AM-R / LDK320M-R variants.
5	OUT	power_out	Regulated output voltage of the LDO (3.3 V nominal, ±0.5% @ 25 °C for the 'A' grade). Delivers up to 200 mA. Requires a 1 uF (up to 22 uF) ceramic output capacitor to GND for stability.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

LDK320AM33R
LDK320AM33RAM30R
LDK320AM33RM30R
LDK320AM33RAM50R
LDK320AM33RM50R
LDK320AM33RAM25R
LDK320AM33RAM18R
LDK320AM33RAM15R
LDK320AM33RAM12R
LDK320AM33RAM36R
LDK320AM33RAM120R
LDK320AM33RAM-R
LDK320AM33RM-R
LDK320AM33RADU30R
LDK320AM33RADU33R
LDK320AM33RADU50R
LDK320AM33RADU120R

CAD (KiCad official)

Symbol: LDK320AM33R
Footprint: Package_TO_SOT_SMD:SOT-23-5
3D model: SOT-23-5 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`ldk320am33r.step`	85 KB	You want the bare part, or you mark your own boards.
`ldk320am33r-etched.step`	2.2 MB	You want the part with `LDK320AM33R` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 536 faces against 102 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

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

Datasheet: STMicroelectronics datasheet (26 pp, sha256 2050e837e033dcbe, 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