The full-size SD card reader seen from above at an angle: a black board almost covered by a metal push-push SD socket, two large round mounting holes, and a row of ten gold-plated holes along the near edge labelled GND, 3V3, NC, CS, MOSI, SCK, MISO, NC, CD and WP.

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SD Card Reader, 3.3 V, SPI and 4-bit SD, with CD and WP

Two 3.3 V card reader boards with the SD bus brought out in full. What the two NC pins really are, which of SPI, 1-bit and 4-bit to use, what each measured, and the wiring for all three.

Supply: 3.3V only
Holes: 10at 2.54 mm
Switches: 2CD and WP

Start here · 01 Why a card and not the flash you already have Open the board in 3D

Turn it over, switch between SPI, 1-bit and 4-bit, and see which of the ten holes each mode needs, including the two printed NC and the two switches, CD and WP.

Product questions & answers ↓

The whole handbook11 articles · 55 min Quick referencePDF · 497 KB SD model (GLB)GLB · 1.6 MB SD CAD (STEP)ZIP · 1.5 MB SD drawing (PDF)PDF · 2.5 MB SD drawing (DXF)ZIP · 58 KB SD socketPDF · datasheet.lcsc.com Pinout and specsThe pin table, and the questions people ask first

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SD Card Reader, 3.3 V, SPI and 4-bit SD, with CD and WP

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Need another

Not on general sale yet. Reply to your order and we will sort out a spare — quote sd.

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Email us or reply to your order, and quote sd — that identifies the product. If something is missing from the bag, your order is the record of what shipped.

Take it with you

Point a phone camera at the code and this page opens there. It is the same address as the one printed on your box, so it is also what to show someone you are passing the board to.