HK24C16HA-USR-B from HK, 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	A0	input	Device / chip-select address input A0. Not used on HK24C16 (16Kbit variant) because the three MSBs of the internal word address consume the 5th-7th device-address bits; per datasheet 'HK24C16 chip select address pin A2, A1 and A0 are not used'. Tie to VIL or leave floating (internally recognized as VIL).
2	A1	input	Device / chip-select address input A1. Not used on HK24C16; tie to VIL or leave floating (internally pulled to VIL).
3	A2	input	Device / chip-select address input A2. Not used on HK24C16; tie to VIL or leave floating (internally pulled to VIL).
4	GND	power_in	Ground reference (0 V) for supply and I/O logic levels.
5	SDA	bidirectional	Serial data line for the 2-wire (I2C-compatible) bus. Open-drain output that can be wired-OR with other open-drain devices; requires an external pull-up resistor to VCC. Bidirectional data in/out at up to 1 MHz (5 V) or 400 kHz (1.8/2.5/2.7 V).
6	SCL	input	Serial clock input for the 2-wire bus. Rising edge latches data into the EEPROM, falling edge clocks data out. Schmitt-triggered input for noise immunity; requires external pull-up.
7	WP	input	Write-protect input. When tied to VIH or VCC, all programming (write) operations to the EEPROM array are disabled; read operations are unaffected. When left unconnected or tied to VIL, programming is allowed (internally recognized as VIL when floating).
8	VCC	power_in	Positive supply input. Operating range 1.8 V to 5.5 V. Typical currents: 10 nA standby, 200 µA read, 300 µA write (500 µA max).

Key specifications

Parameter	Value
Manufacturer	HK
Package	SOP-8
Category	Memory
Pins	8

CAD (KiCad official)

Symbol: HK24C16HA-USR-B
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOP-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`hk24c16ha-usr-b.step`	122 KB	You want the bare part, or you mark your own boards.
`hk24c16ha-usr-b-etched.step`	2.7 MB	You want the part with `HK24C16HA-USR-B` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 666 faces against 147 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

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

Datasheet: HK datasheet (18 pp, sha256 f53dc392d6661c3b, 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