The microSD card reader seen from above at an angle: a black board with a metal push-push microSD socket filling most of it, two large round mounting holes, and a row of eight gold-plated holes along the near edge labelled GND, 3V3, NC, CS, MOSI, SCK, MISO and NC.

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MicroSD Card Reader, 3.3 V, SPI and 4-bit SD

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: 8at 2.54 mm
Peak read: 5.04MB/s, 4-bit

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 eight holes each mode needs, including the two printed NC.

Product questions & answers ↓

The whole handbook11 articles · 55 min Quick referencePDF · 519 KB microSD model (GLB)GLB · 1.1 MB microSD CAD (STEP)ZIP · 1.4 MB microSD socketPDF · datasheet.lcsc.com Pinout and specsThe pin table, and the questions people ask first

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MicroSD Card Reader, 3.3 V, SPI and 4-bit SD

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

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Email us or reply to your order, and quote microsd — 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.