SIT1043QT from SIT, in a SOP-14. 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. Drives the CAN bus differential output; internally biased to VIO. A dominant-timeout function protects the bus if TXD is held low.
2	GND	power_in	Ground reference for the device (0 V).
3	VCC	power_in	5 V bus-side supply (recommended 4.5-5.5 V, absolute max -0.3 to +6 V). Powers the CAN transmitter output stage.
4	RXD	output	Receive data output to the CAN controller. Reports bus state referenced to VIO. Drive strength IOH > -2 mA, IOL < 2 mA.
5	VIO	power_in	I/O level supply that sets the reference for TXD, RXD, EN, STBN and ERRN logic levels. Range 2.8-5.5 V (1.7-5.5 V on SIT1043Q/1 variant for 1.8 V MCUs). Includes under-voltage protection.
6	EN	input	Enable / mode-control input. Together with STBN selects among Normal, Silent, Standby, Sleep-Wait and Sleep modes. Internally pulled to a defined level.
7	INH	output	Inhibit output used to control an external voltage regulator. Driven high (to VBAT) on wake-up events and floats/low in sleep mode. IO(INH) < 1 mA.
8	ERRN	output	Active-low error/status indication output referenced to VIO. Flags conditions such as bus errors, wake events, under-voltage and thermal shutdown. IOH > -2 mA, IOL < 2 mA.
9	WAKE	input	Local wake-up input. A qualified level change on WAKE wakes the device from sleep mode.
10	VBAT	power_in	Battery supply pin (recommended 4.5-40 V; absolute max -0.3 to +58 V, or +45 V on SIT1043Q/1). Powers the wake-up logic, INH driver and internal regulators; includes under-voltage protection.
11	SPLIT	output	Common-mode stabilization output for the CAN bus split-termination network (typically VCC/2). Present on SIT1043QT/QTK; on SIT1043Q/1 this pin is a no-connect (NC).
12	CANL	bidirectional	Low-level CAN bus I/O. Withstands -58 V to +58 V bus fault voltage and -30 V to +30 V common-mode input range.
13	CANH	bidirectional	High-level CAN bus I/O. Withstands -58 V to +58 V bus fault voltage and -30 V to +30 V common-mode input range.
14	STBN	input	Active-low standby / mode-control input. Combined with EN, selects the device operating mode (Normal, Silent, Standby, Sleep-Wait, Sleep).

Key specifications

Parameter	Value
Manufacturer	SIT
Package	SOP-14
Category	Comm/UART
Pins	14

Ordering variants

Same part, different packaging or reel option.

SIT1043QT
SIT1043QT/1
SIT1043QTK
SIT1043QTK/1

CAD (KiCad official)

Symbol: SIT1043QT
Footprint: Package_SO:SOIC-14_3.9x8.7mm_P1.27mm
3D model: SOP-14 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`sit1043qt.step`	195 KB	You want the bare part, or you mark your own boards.
`sit1043qt-etched.step`	2.2 MB	You want the part with `SIT1043QT` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 552 faces against 237 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 (29 pp, sha256 e0f1086f046ad773, 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