HE9073A18M5R from HEERMICR, 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	VIN	power_in	Unregulated input supply, 2.0V to 7.0V (absolute max 9.0V). Bypass to GND with a ceramic capacitor ≥4.7µF close to the pin.
2	GND	power_in	Device ground reference for VIN, VOUT and EN. Connect to system ground plane.
3	CE	input	Chip-enable (ON/OFF) input. Logic-high (VIH ≥ 1.2V at VIN=5V) enables the regulator; logic-low (VIL ≤ 0.4V) shuts it down (ISD ≤ 0.1µA). Must not be left floating; may be tied to VIN for always-on.
4	NC	unconnected	No internal connection. Leave floating or tie to GND; do not connect to other nets.
5	VOUT	power_out	Regulated 1.8V output (tolerance ±1%, up to ≥500mA). Requires an output capacitor ≥4.7µF (ceramic) to GND for stability and transient response.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

HE9073A18M5R
HE9073A18M5RMR
HE9073A18M5RPR
HE9073A18M5RD4R

CAD (KiCad official)

Symbol: HE9073A18M5R
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: HEERMICR datasheet (12 pp, sha256 27a01576a32d0f6f, 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