HSM05-7 from HXY MOSFET, in a SOT-23. 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	I/O1	passive	Protected I/O line 1. Anode of the first internal ESD steering diode; cathode is tied to pin 3. Connect in series/shunt to the data line requiring transient protection. Reverse working voltage 5.0 V, reverse breakdown 6.0 V min (IT = 1 mA), clamping voltage 9.8 V max at 1 A (8/20 µs) and 18 V max at 17 A (8/20 µs).
2	I/O2	passive	Protected I/O line 2. Anode of the second internal ESD steering diode; cathode is tied to pin 3. Same electrical characteristics as pin 1 (VRWM = 5.0 V, VBR = 6.0 V min, VC = 9.8 V @ 1 A / 18 V @ 17 A, CJ ≈ 180 pF typ at VR = 0 V, 1 MHz).
3	COM/K	passive	Common cathode of both internal ESD diodes. Typically connected to the local power/reference rail (or GND for bidirectional-line protection) to sink ESD/EFT surge current away from the protected I/Os. Reverse leakage current 10 µA max at VRWM = 5.0 V.

Key specifications

Parameter	Value
Manufacturer	HXY MOSFET
Package	SOT-23
Category	Circuit Protection
Pins	3

Ordering variants

Same part, different packaging or reel option.

HSM05-7

CAD (KiCad official)

Symbol: HSM05-7
Footprint: Package_TO_SOT_SMD:SOT-23
3D model: SOT-23 (KiCad packages3D, STEP)

Provenance

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

Datasheet: HXY MOSFET datasheet (None pp, sha256 445f812871929695, 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