SIT1051AQT 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 protocol controller. Internal pull-up to VIO; drives CANH/CANL to the dominant state when low. VIH=2V (SIT1051AQT) / 0.7·VIO (SIT1051AQT/3); dominant timeout typ. 2 ms guards the bus against a stuck-low TXD.
2	GND	power_in	Device ground / 0 V reference for both the VCC and VIO supplies and all logic and bus signals.
3	VCC	power_in	5 V transceiver supply, 4.5 V to 5.5 V operating range (abs-max −0.3 V to 7 V). VCC undervoltage lockout typ. 4 V. Supplies the CAN driver and receiver.
4	RXD	output	Receive data output to the CAN protocol controller. Push-pull output, reports the bus state (LOW = dominant, HIGH = recessive). Output swing referenced to VIO (or VCC on /E version).
5	N.C.	unconnected	No internal connection on the base SIT1051AQT variant. On SIT1051AQT/3 this pin is VIO (2.8-5.5 V I/O level supply); on SIT1051AQT/E it is EN (active-low off-mode enable). Leave open or tie to GND for the base part.
6	CANL	bidirectional	Low-level CAN bus line. Bidirectional differential bus pin, protected to ±58 V DC on the bus side. Internally biased to VCC/2 in recessive state; driven low in dominant state.
7	CANH	bidirectional	High-level CAN bus line. Bidirectional differential bus pin, protected to ±58 V DC on the bus side. Internally biased to VCC/2 in recessive state; driven high (typ. 3.5 V) in dominant state.
8	S	input	Silent-mode control input. LOW selects high-speed (normal) mode with the transmitter enabled; HIGH selects silent (listen-only) mode where the transmitter is disabled while the receiver stays active. Internal pull-down; VIH=2V (AQT) / 0.7·VIO (AQT/3).

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

SIT1051AQT
SIT1051AQT/3
SIT1051AQT/E

CAD (KiCad official)

Symbol: SIT1051AQT
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
`sit1051aqt.step`	122 KB	You want the bare part, or you mark your own boards.
`sit1051aqt-etched.step`	1.9 MB	You want the part with `SIT1051AQT` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 479 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 (21 pp, sha256 203081e8e295eeb3, 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