component
nRF52840-CKAA
Public Unreviewedby John Lauer
Nordic nRF52840 — multi-protocol Bluetooth LE 5.3 / Thread / Zigbee / 802.15.4 SoC. ARM Cortex-M4F @ 64 MHz, 1 MB flash, 256 KB RAM, USB, NFC-A, CryptoCell-310. aQFN-73, 7×7 mm. A reference 'perfect chip' page: interactive symbol + footprint + 3D, full CAD for KiCad/Fusion/Altium, datasheet + supplemental docs, live sourcing, and pick-and-place data.
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README.md+2−2@@ -113,8 +113,8 @@ send the nRF52840-CKAA library to my Downloads folder and open it </details> <details>-<summary style="cursor:pointer;font-weight:700;font-size:1.1em;padding:8px 0">🟤 Solder paste & InstaPCB assembly</summary>-<p>The footprint ships a paste layer. For this <b>fine-pitch (0.5 mm) aQFN-73</b>, <b>InstaPCB</b> renders the paste as a <b>micro-dot aperture array</b> rather than full pads, to cut the paste volume that causes <b>bridging</b> between the staggered aQFN rows. Default is <b>lead-free (SAC305)</b>; a leaded profile is selectable.</p>+<summary style="cursor:pointer;font-weight:700;font-size:1.1em;padding:8px 0">🟤 Solder paste & 3rd party fab assembly</summary>+<p>The footprint ships a paste layer. For this <b>fine-pitch (0.5 mm) aQFN-73</b>, the <b>3rd party fab</b> renders the paste as a <b>micro-dot aperture array</b> rather than full pads, to cut the paste volume that causes <b>bridging</b> between the staggered aQFN rows. Default is <b>lead-free (SAC305)</b>; a leaded profile is selectable.</p> <ul> <li>Open the <b>PCB Footprint</b> viewer above and toggle the <b>paste / solder-dot layer</b> to see the default aperture placement.</li> <li>If the default micro-dot pattern bridges or starves joints on your build, <b>report it in <a href="#discussions">Discussions</a></b> with a photo — paste defaults improve from community feedback.</li>