SIT1051AT from SIT, 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	TXD	input	Transmit data input from the CAN controller. Logic low drives the bus dominant; logic high (or floating, internally biased high) leaves the bus recessive. VIH ≥ 2V, VIL ≤ 0.8V for the SIT1051AT variant (5V logic).
2	GND	power_in	Device ground reference. All voltage references are with respect to this pin.
3	VCC	power_in	5V supply for the transceiver core and CAN bus drivers. Operating range 4.5V to 5.5V; absolute max -0.3V to 7V. Includes undervoltage protection.
4	RXD	output	Receive data output to the CAN controller. Push-pull output referenced to VCC (SIT1051AT variant). Low for dominant bus, high for recessive. IOH = -3 mA typ, IOL = 5 mA typ.
5	N.C.	unconnected	No internal connection on the SIT1051AT variant. On sibling variants this pin is used as EN (SIT1051AT/E, shutdown-mode enable, active low) or VIO (SIT1051AT/3, 3.3V I/O supply for level translation).
6	CANL	bidirectional	Low-side CAN bus I/O. Differential complement to CANH. Dominant output typ 1.5V, recessive ~0.5·VCC. Withstands -70V to +70V continuous; input resistance 15 kΩ typ.
7	CANH	bidirectional	High-side CAN bus I/O. Differential complement to CANL. Dominant output typ 3.5V, recessive ~0.5·VCC. Withstands -70V to +70V continuous; input resistance 15 kΩ typ.
8	S	input	Mode select input. Low = high-speed (normal) mode with active bus driver; high = silent (listen-only) mode where the transmitter is disabled but RXD still reports bus activity. Internally biased low if left floating.

Key specifications

Parameter	Value
Manufacturer	SIT
Package	SOP-8
Category	Comm/UART
Pins	8

Ordering variants

Same part, different packaging or reel option.

SIT1051AT
SIT1051AT/E
SIT1051AT/3

CAD (KiCad official)

Symbol: SIT1051AT
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
`sit1051at.step`	122 KB	You want the bare part, or you mark your own boards.
`sit1051at-etched.step`	1.7 MB	You want the part with `SIT1051AT` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 433 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: SIT datasheet (19 pp, sha256 1de7e49a0562374d, 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