LDK130M33R 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	IN	power_in	Unregulated DC input supply for the LDO, 1.9 V to 5.5 V operating (absolute max 7 V). Requires a 1 uF ceramic input capacitor (C_I) to ground close to the pin.
2	GND	power_in	Common ground return for the device. All voltages in the datasheet are referenced to this pin.
3	EN	input	Enable logic input: drive high to turn the regulator on, low to place the device in shutdown (total consumption < 1 uA). Absolute max V_EN is V_IN + 0.3 V; must not float.
4	BYP	passive	Noise-reduction bypass pin on this fixed 3.3 V (M33) version. An optional small ceramic bypass capacitor (C_BYP) to GND lowers output noise; if unused the pin must be left floating with no board routing. Absolute max pin voltage 2 V. (On adjustable variants this pin is ADJ, the feedback input.)
5	OUT	power_out	Regulated 3.3 V output, 300 mA maximum guaranteed. Requires a >= 1 uF ceramic output capacitor (C_O) to GND for stability; typical dropout 100 mV at 100 mA load.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

LDK130M33R
LDK130M33RPU33R
LDK130M33RC33R

CAD (KiCad official)

Symbol: LDK130M33R
Footprint: Package_TO_SOT_SMD:SOT-23-5
3D model: SOT-23-5L (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`ldk130m33r.step`	85 KB	You want the bare part, or you mark your own boards.
`ldk130m33r-etched.step`	2.0 MB	You want the part with `LDK130M33R` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 494 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 (27 pp, sha256 8c05ff9f4c61dc16, 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