HXL1509-5.0 from HXY MOSFET, in a SOP-8. 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	Positive input supply for the switching regulator, 4.5 V to 40 V (absolute max +40 V). Requires a local bypass capacitor to minimize voltage transients and supply switching current.
2	Output	output	Internal power switching output (emitter of the internal NPN switch). Swings between (VIN - VSAT) and approximately -0.5 V at ~150 kHz with duty cycle ≈ VOUT/VIN. Connect to the external inductor and Schottky catch diode; keep copper area minimal to reduce noise coupling.
3	FB	input	Output voltage feedback input to the internal error amplifier. For the fixed 5.0 V version this pin connects directly to the regulated 5.0 V output rail (internal divider sets VOUT = 5.00 V ±4%). Feedback bias current typ 50 nA. Abs-max -0.3 V to VIN.
4	EN	input	ON/OFF shutdown control (active-high shutdown). VIL ≤ 0.6 V enables the regulator; VIH ≥ 2.0 V disables it and drops supply current to ~50 µA (typ) standby. Input current typ 12 µA at 5 V. Tie to GND if shutdown is not used. Abs-max -0.3 V to VIN.
5	GND	power_in	Circuit ground. Pins 5, 6, 7, and 8 are all tied to GND on the SOP-8 package and also serve as a thermal path; connect all four to the ground plane for best thermal performance.
6	GND	power_in	Circuit ground / thermal pin. Tie to the ground plane along with pins 5, 7, and 8.
7	GND	power_in	Circuit ground / thermal pin. Tie to the ground plane along with pins 5, 6, and 8.
8	GND	power_in	Circuit ground / thermal pin. Tie to the ground plane along with pins 5, 6, and 7.

Key specifications

Parameter	Value
Manufacturer	HXY MOSFET
Package	SOP-8
Category	PMIC
Pins	8

Ordering variants

Same part, different packaging or reel option.

HXL1509-5.0
HXL1509-5.0-5V

CAD (KiCad official)

Symbol: HXL1509-5.0
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOP-8 (KiCad packages3D, STEP)

Provenance

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

Datasheet: HXY MOSFET datasheet (8 pp, sha256 5430e25b77bdb834, 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