SLM1302 from SOLA IC, in a SOIC-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	VCC2	power_in	Primary/main power supply input (typically the backup or trickle-charged supply). Operating range 2.0 V to 5.5 V. Connects through the internal power-control block along with VCC1.
2	X1	input	32.768 kHz crystal input. Connect one terminal of an external 32.768 kHz crystal here; drives the internal oscillator and divider that clocks the real-time counter.
3	X2	output	32.768 kHz crystal output. Connect the other terminal of the external 32.768 kHz crystal here to complete the oscillator loop.
4	GND	power_in	Device ground reference. All voltages are referenced to this pin (-0.5 V to 7.0 V absolute-max on any other pin relative to GND).
5	RST	input	Active-low reset / chip enable (shown with overline in the datasheet). Driving RST high initiates a data transfer and enables the shift register for address/command; driving it low terminates the transfer and places I/O in high-impedance. At power-up RST must be held low until VCC > 2.0 V.
6	I/O	bidirectional	Serial data line. Bidirectional command/address/data pin used with SCLK to shift bytes in (write) or out (read). Goes to high-impedance when RST is low. Logic-1 output guaranteed 1.6 V @ VCC=2 V, 2.4 V @ VCC=5 V; leakage up to 500 uA.
7	SCLK	input	Serial clock input from the host MCU. Data on I/O is sampled on the rising edge and shifted out on the falling edge. Max clock frequency 0.5 MHz @ VCC=2 V, 2 MHz @ VCC=5 V.
8	VCC1	power_in	Secondary power supply input (typically the trickle-charged/backup battery rail; can be swapped with VCC2 depending on system design). Operating range 2.0 V to 5.5 V. Internal power-control block selects the higher of VCC1/VCC2.

Key specifications

Parameter	Value
Manufacturer	SOLA IC
Package	SOIC-8
Category	RTC
Pins	8

CAD (KiCad official)

Symbol: SLM1302
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOIC-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`slm1302.step`	122 KB	You want the bare part, or you mark your own boards.
`slm1302-etched.step`	1.7 MB	You want the part with `SLM1302` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 420 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: SOLA IC datasheet (12 pp, sha256 5a4d6145cbd1de79, 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