KX124-1051 from Kionix Inc, in a LGA-16(3x3). 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	IO_VDD	power_in	Power supply input for the digital communication I/O pads (1.7V - 3.6V). Optionally decouple to ground with a 0.1uF ceramic capacitor.
2	NC	unconnected	Not Internally Connected. Can be connected to VDD, IO_VDD, GND or left floating.
3	NC	unconnected	Not Internally Connected. Can be connected to VDD, IO_VDD, GND or left floating.
4	SCLK/SCL	input	SPI Serial Clock (SCLK) / I2C Serial Clock (SCL). Muxed pin serving both digital interfaces; interface selection is determined by nCS state (nCS held high = I2C).
5	GND	power_in	Ground reference.
6	SDI/SDA	bidirectional	SPI Serial Data Input (SDI) / I2C Serial Data (SDA). Muxed pin serving both digital interfaces; protocol selection is via nCS pin state.
7	SDO/ADDR	bidirectional	Serial Data Out during 4-wire SPI communication; sets part of the I2C device address during I2C communication. Do not leave floating. I2C slave address is 0x1E or 0x1F depending on this pin.
8	nCS	input	Chip Select (active LOW) for SPI communication. Connect to IO_VDD for I2C communication. Do not leave floating. Selects the digital interface protocol.
9	INT2	output	Physical Interrupt 2 (push-pull). Pin is Hi-Z during POR and driven LOW following POR. Leave floating if not used.
10	NC	unconnected	Not Internally Connected. Can be connected to VDD, IO_VDD, GND or left floating.
11	INT1	output	Physical Interrupt 1 (push-pull). Pin is Hi-Z during POR and driven LOW following POR. Leave floating if not used.
12	GND	power_in	Ground reference.
13	TRIG	input	Trigger input pin for FIFO buffer control (Trigger mode). Connect to GND when not using the external trigger option.
14	VDD	power_in	Main power supply input (1.71V - 3.6V operating). Decouple to ground with a 0.1uF ceramic capacitor.
15	NC	unconnected	Not Internally Connected. Can be connected to VDD, IO_VDD, GND or left floating.
16	NC	unconnected	Not Internally Connected. Can be connected to VDD, IO_VDD, GND or left floating.

Key specifications

Parameter	Value
Manufacturer	Kionix Inc
Package	LGA-16(3x3)
Category	Sensor
Pins	16

CAD (KiCad official)

Symbol: KX124-1051
Footprint: Package_LGA:LGA-16_3x3mm_P0.5mm
3D model: LGA-16(3x3) (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`kx124-1051.step`	177 KB	You want the bare part, or you mark your own boards.
`kx124-1051-etched.step`	1.6 MB	You want the part with `KX124-1051` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 423 faces against 104 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: Kionix Inc datasheet (84 pp, sha256 ece4ed961bcb0edc, 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