HG24C04MM from HGSEMI, in a MSOP-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	unconnected	Not connected on HG24C04. The device only uses A1 and A2 for hardwired addressing; A0 is a no-connect and can be tied to ground.
2	A1	input	Device address input. Hardwired to VCC or GND to set the least-significant device address bit; must match the corresponding bit in the I2C device address word to enable the chip.
3	A2	input	Device address input. Hardwired to VCC or GND. Together with A1, allows up to four HG24C04 devices to share a single I2C bus.
4	GND	power_in	Ground reference for the device.
5	SDA	bidirectional	Bidirectional serial data line for the two-wire (I2C) interface. Open-drain output; requires an external pull-up resistor to VCC. May be wire-ORed with any number of other open-drain or open-collector devices.
6	SCL	input	Serial clock input. Positive edge clocks data into the EEPROM; negative edge clocks data out. Schmitt-triggered filtered input for noise suppression. Supports 1 MHz at 5V and 400 kHz at 1.8/2.5/2.7V.
7	WP	input	Write Protect input. Tie to GND for normal read/write operation; tie to VCC to hardware-write-protect the full 4K array.
8	VCC	power_in	Positive supply voltage, 1.7V to 5.5V. Bypass with a 0.1uF ceramic capacitor to GND close to the pin.

Key specifications

Parameter	Value
Manufacturer	HGSEMI
Package	MSOP-8
Category	Memory
Pins	8

Ordering variants

Same part, different packaging or reel option.

HG24C04MM/TR
HG24C04MMN
HG24C04MMM/TR
HG24C04MMM-4K/TR
HG24C04MMM5/TR
HG24C04MMM8/TR
HG24C04MMDQ3/TR
HG24C04MMDQ2/TR

CAD (KiCad official)

Symbol: HG24C04MM
Footprint: Package_SO:MSOP-8_3x3mm_P0.65mm
3D model: MSOP-8 (KiCad packages3D, STEP)

Provenance

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

Datasheet: HGSEMI datasheet (19 pp, sha256 228b5241d9f7dc0a, 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