AT24C16M5 from HGSEMI, 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	SCL	input	I2C serial clock input. Positive-edge clocks data in; negative-edge clocks data out. Schmitt-triggered, noise-filtered input.
2	Vss	power_in	Ground reference for the VCC supply voltage.
3	SDA	bidirectional	I2C bidirectional serial data. Open-drain output; requires an external pull-up to VCC. May be wire-OR'd with other open-drain devices. VOL = 0.4 V max at IOL = 2.1 mA (VCC = 3.0 V).
4	VCC	power_in	Supply voltage input, 1.7 V to 5.5 V. Absolute maximum 6.5 V. Standby current ~1 uA at 5.5 V; read current ~0.2 mA at 400 kHz.
5	WCB	input	Write Control input, active low. Tie to VCC to inhibit all write operations to the memory array; tie to Vss (or leave floating, internally pulled to Vss) to allow normal writes.

Key specifications

Parameter	Value
Manufacturer	HGSEMI
Package	SOT-23-5
Category	Memory
Pins	5

Ordering variants

AT24C16M5/TR
AT24C16M5N
AT24C16M5M/TR
AT24C16M5MT/TR
AT24C16M5MM/TR
AT24C16M5DQ3/TR
AT24C16M5DQ2/TR

CAD (KiCad official)

Symbol: AT24C16M5
Footprint: Package_TO_SOT_SMD:SOT-23-5
3D model: SOT-23-5 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`at24c16m5.step`	85 KB	You want the bare part, or you mark your own boards.
`at24c16m5-etched.step`	1.6 MB	You want the part with `AT24C16M5` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 402 faces against 102 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: HGSEMI datasheet (21 pp, sha256 3e86ae75d43fb087, 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