LD39015M33R 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	LDO input voltage. Accepts 1.5 V to 5.5 V; requires a 1 µF ceramic input capacitor to ground for stability.
2	GND	power_in	Common ground reference for the regulator.
3	EN	input	Enable logic input. Drive low to put the LDO in shutdown mode (IQ < 1 µA); drive high to enable the regulator output. Must not be left floating.
4	NC	unconnected	Not connected internally. Leave floating or tie to any convenient net.
5	OUT	power_out	Regulated output voltage (3.3 V nominal for the M33R suffix, ±2.0% at 25 °C). Delivers up to 150 mA; requires a 1 µF ceramic output capacitor to ground 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.

LD39015M33RM08R
LD39015M33RM10R
LD39015M33RM12R
LD39015M33RM125R
LD39015M33RM15R
LD39015M33RM18R
LD39015M33RM25R
LD39015M33R

CAD (KiCad official)

Symbol: LD39015M33R
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 (15 pp, sha256 3f7482af11a2ca76, 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