Circuit Issues
Templates
#0200StorageDRC cleanv1.0

microSD card holder, SPI

microSD socket wired for SPI mode, for data logging and file storage on an ESP32 or any MCU with SPI. Pull-ups on chip select, MOSI, MISO and the unused data lines (none on the clock, as it should be) and local decoupling on the card supply. The interface is the four SPI lines and the 3.3 V supply.

3D render of the 0200 microSD card holder, SPI KiCad design block
3D render (KiCad 10)
3D render of the 0200 microSD card holder, SPI KiCad design block
3D render, top view (KiCad 10)
Schematic of the 0200 microSD card holder, SPI KiCad design block
Schematic (KiCad 10)

Key specifications

  • Card supply 3.3 V
  • SPI up to 25 MHz (default speed)
  • Pull-ups on CS, MOSI, MISO and the unused data lines

Design notes

  • No card-detect line is brought out.

Seen in real hardware

Flossa AI Controller PCBA, 3D render, isometric view

Flossa AI Controller

Uses this block alongside 9 other templates · flossa.ai

Coming soon

This block is not available yet. It is released once its checks are complete. Planned price: €29.

One email when this template is released. No spam.

Planned package contents

  • KiCad 10 design block

    Schematic and PCB layout fragment; symbols and footprints embedded

  • BOM (CSV)

    Manufacturer part numbers and LCSC codes

  • Schematic PDF + README

    Interface, specs, population options and design notes

  • 3D models

    STEP models of the special parts; standard parts use KiCad’s 3D library

  • template.yaml

    Machine-readable interface and limits

PCB Composer

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About PCB Composer

Development status

Block ID0200
Block name0200-microsd-spi
Version1.0
StatusDRC clean – Schematic and layout pass the KiCad rule checks; not yet verified on hardware.
Open review itemsNone
PCB layoutRule-checked layout fragment
FormatKiCad 10 design block (schematic + PCB)
Last change2026-11-03

Interface

Hierarchical labels the block exposes to the rest of your design.

NetDirectionDescription
VDDPower in3.3 V card supply
SPI_CLKInputSPI clock
SPI_CSInputChip select (DAT3), pull-up
SPI_MOSIInputSPI data in (CMD), pull-up
SPI_MISOOutputSPI data out (DAT0), pull-up

FAQ

Which KiCad version do I need?

KiCad 10. The files are saved in the KiCad 10 format and are meant to be placed with KiCad’s Design Blocks feature (schematic block, then “Apply Design Block Layout” on the PCB).

Do I need the Circuit Issues part library?

No. Symbols are embedded in the schematic and footprints in the PCB, so the block opens on its own. Parts carry manufacturer part numbers and LCSC codes.

Is the layout production-ready?

The layout fragment passes the KiCad design rule check. Route it into your board and run DRC with your own fab rules.

Can I use the template in a commercial product?

The licence terms are published together with the first release.

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