2 layers40 × 20 mm

B MicroSD BRK R1.0
Boardoza/Boardoza_MicroSD_Breakout_Board
Compact SPI-based microSD breakout board for 3.3V and 5V systems.
9 partsCC-BY-SA-4.0
KiCad boards from 3 GitHub repositories tagged “spi-interface”, the most starred first; open any of them in PCBKit.

Boardoza/Boardoza_MicroSD_Breakout_Board
Compact SPI-based microSD breakout board for 3.3V and 5V systems.

mlab-modules/SPIEX01
SPI (bus) expander to control multiple devices from the one SPI master.

svddevelop/x033_Converter_CDC_UART_SPI_I2C_PIN
CH32X033 as a USB multitool that allows you to configure pin, UART, SPI, and I2C settings through a terminal.