LD39015M18R 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	LDO input voltage supply. Operating range 1.5 V to 5.5 V (absolute max 7 V). Bypass with 1 μF ceramic to GND close to the pin.
2	GND	power_in	Common ground reference for the device. All voltages are referred to this pin.
3	EN	input	Enable logic input. Logic low (≤ 0.4 V) puts the regulator in shutdown (IQ < 1 μA); logic high (≥ 0.9 V) turns the output on. Turn-on time ~30 μs typ.
4	NC	unconnected	Not connected internally. Leave floating or tie to GND for mechanical stability.
5	OUT	power_out	Regulated output voltage (1.8 V nominal for LD39015M18R). Delivers up to 150 mA. Requires a 1 μF (min) ceramic output capacitor for stability; up to 22 μF supported.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

LD39015M18RM08R
LD39015M18RM10R
LD39015M18RM12R
LD39015M18RM125R
LD39015M18RM15R
LD39015M18R
LD39015M18RM25R
LD39015M18RM33R

CAD (KiCad official)

Symbol: LD39015M18R
Footprint: Package_TO_SOT_SMD:SOT-23-5
3D model: SOT-23-5 (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: 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