MCP251863T-E from Microchip, in a SSOP-28-208mil. 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	VIO	power_in	Transceiver digital I/O supply. Sets the logic reference level for digital pins.
2	NC	unconnected	No Connect. Leave unconnected.
3	CANL	bidirectional	CAN bus Low-Level voltage line. Differential transceiver I/O.
4	CANH	bidirectional	CAN bus High-Level voltage line. Differential transceiver I/O.
5	STBY	input	Transceiver Standby Mode control input. Drive high to place the transceiver in low-power standby.
6	nINT1/GPIO1	bidirectional	Configurable pin: active-low Interrupt output 1, or general-purpose I/O (GPIO1). Push-pull or open-drain selectable.
7	nINT0/GPIO0/XSTBY	bidirectional	Configurable pin: active-low Interrupt output 0, general-purpose I/O (GPIO0), or transceiver standby control (XSTBY) driving the on-die STBY of the transceiver.
8	NC	unconnected	No Connect. Leave unconnected.
9	SCK	input	SPI clock input from host MCU. Up to 20 MHz.
10	SDI	input	SPI serial data input (MOSI).
11	SDO	output	SPI serial data output (MISO).
12	NC	unconnected	No Connect. Leave unconnected.
13	nCS	input	Active-low SPI chip-select input from host MCU.
14	VDD	power_in	CAN FD controller positive supply. 2.7 V to 5.5 V.
15	TXCAN	output	CAN FD Controller transmit output. Connect to TXD of the transceiver (internal wiring within this package pairs 15↔23).
16	RXCAN	input	CAN FD Controller receive input. Connect to RXD of the transceiver (internal wiring within this package pairs 16↔28).
17	NC	unconnected	No Connect. Leave unconnected.
18	CLKO/SOF	output	Clock output with prescaler, or Start-Of-Frame test output selectable via configuration.
19	nINT	output	Active-low interrupt output from the CAN FD Controller. Push-pull or open-drain configurable.
20	OSC2	output	External oscillator output. Connect to one terminal of the crystal/resonator (4, 20 or 40 MHz).
21	OSC1	input	External oscillator input or external clock input. Connect to the other crystal terminal or an external clock source.
22	VSS	power_in	Controller ground return.
23	TXD	input	Transceiver transmit data input. Connect to TXCAN of the controller (pin 15).
24	GND	power_in	Transceiver ground return.
25	VCC	power_in	Transceiver positive supply (typ. 5 V for standard CAN transceiver operation).
26	NC	unconnected	No Connect. Leave unconnected.
27	NC	unconnected	No Connect. Leave unconnected.
28	RXD	output	Transceiver receive data output. Connect to RXCAN of the controller (pin 16).

Key specifications

Parameter	Value
Manufacturer	Microchip
Package	SSOP-28-208mil
Category	Comm/UART
Pins	28

Ordering variants

Same part, different packaging or reel option.

MCP251863T-EE/SS
MCP251863T-E/SS

CAD (KiCad official)

Symbol: MCP251863T-E
Footprint: Package_SO:SSOP-28_5.3x10.2mm_P0.65mm
3D model: SSOP-28-208mil (KiCad packages3D, STEP)

Provenance

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

Datasheet: Microchip datasheet (106 pp, sha256 88a35dc5bc412ca2, 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