SIT1040QT 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. Internally pulled to VCC (open-state logic high); a dominant TXD held low longer than t_dom (300-700 µs) triggers the dominant time-out and forces the driver recessive. VIH ≥ 2 V, VIL ≤ 0.8 V.
2	GND	power_in	Ground supply / reference for all voltages. On the DFN3*3-8 package, the exposed back pad is internally tied to GND and should be soldered to the PCB ground for improved heat dissipation.
3	VCC	power_in	5 V supply voltage (operating range 4.75-5.25 V, absolute max 6 V). Typical standby ICC = 5 µA; dominant ICC ≈ 38 mA (60 Ω load).
4	RXD	output	Receive data output to the CAN controller; reads back the differential state of the CAN bus. Push-pull CMOS output: VOH ≥ 4 V at IO = -2 mA, VOL ≤ 0.4 V at IO = 2 mA. Low = dominant, High = recessive.
5	SPLIT	output	Common-mode stabilization output, nominally VCC/2 (0.3·VCC to 0.7·VCC for
6	CANL	bidirectional	Low-level CAN bus line. Bus fault tolerant from -40 V to +40 V. In dominant state driven to ~1.5 V; recessive state biased to ~0.5·VCC. Differential input resistance 30-80 kΩ.
7	CANH	bidirectional	High-level CAN bus line. Bus fault tolerant from -40 V to +40 V. In dominant state driven to ~3.5 V; recessive state biased to ~0.5·VCC. Differential input resistance 30-80 kΩ.
8	STB	input	Standby mode control input. Low (or open, internally pulled to GND per typical CAN transceiver convention here) = normal high-speed operation; High = low-power standby with bus wake-up capability. VIH ≥ 2.0 V, VIL ≤ 0.8 V.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

SIT1040QT
SIT1040QTK

CAD (KiCad official)

Symbol: SIT1040QT
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 (17 pp, sha256 c6053c8797584571, 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