1-100PCS ATSAMD21G18A-AU ATSAMD21 TQFP48 48MHz 256KB 32-bit Microcontroller Chip IC Brand New Original WholesaleBuy Directly From QR Worldchips Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.