SIT1057QT 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. A logic low on TXD drives the bus to the dominant state; a logic high (or floating) leaves the bus recessive. Internal pull-up to VIO. TXD dominant time-out (t_dom_TXD) is typically 3 ms (0.8 ms min, 6.5 ms max) to prevent a stuck-dominant TXD from permanently blocking the bus.
2	GND	power_in	Ground reference (0 V). All voltages on the device are referenced to this pin.
3	VCC	power_in	Main 5 V supply for the transceiver. Recommended operating range 4.75 V to 5.25 V; absolute-max -0.3 V to +7 V. Features an internal under-voltage lock-out (UVLO) that forces the bus to recessive when VCC is invalid.
4	RXD	output	Receive data output to the CAN controller. Reports the differential bus state: low when the bus is dominant, high when recessive. Output is referenced to VIO on /3 variants, or to VCC on the base SIT1057QT variant.
5	N.C.	unconnected	Not internally connected on the SIT1057QT (base) variant. Leave floating or tie to GND. On the SIT1057QT/3 and SIT1057QTK/3 variants this same pin becomes VIO (I/O reference supply, 2.95 V-5.25 V) to allow 3.3 V MCU interfacing.
6	CANL	bidirectional	Low-level CAN bus I/O. Nominal 1.5 V dominant / 2.5 V recessive. Withstands -40 V to +40 V bus-fault voltage and -27 V to +27 V differential relative to CANH. Includes short-circuit current limiting (±100 mA dominant).
7	CANH	bidirectional	High-level CAN bus I/O. Nominal 3.5 V dominant / 2.5 V recessive. Withstands -40 V to +40 V bus-fault voltage. Together with CANL forms the differential CAN pair (Vdiff 1.5 V-3.0 V dominant).
8	S	input	Mode select input. Logic low selects high-speed (normal) mode; logic high selects silent (listen-only / standby) mode in which the transmitter is disabled but the receiver still forwards traffic to RXD. Referenced to VIO on /3 variants.

Key specifications

Parameter	Value
Manufacturer	SIT
Package	SOP-8
Category	Interface
Pins	8

Ordering variants

Same part, different packaging or reel option.

SIT1057QT
SIT1057QT/3
SIT1057QTK/3

CAD (KiCad official)

Symbol: SIT1057QT
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOP-8 (KiCad packages3D, STEP)

Provenance

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

Datasheet: SIT datasheet (19 pp, sha256 60c076ba9502071a, retrieved 2026-08-17, tier: lcsc)
Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
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