SC-20P SMD Quartz Crystal Unit Seiko Instruments SC-20P SMD Quartz Crystal Unit includes a built-in crystal resonator processed by highly reliable photolithographic technology. This crystal unit is suitable for microcontrollers with low ESR (R1=50kΩ maximum) and high-density surface mounting. The SC-20P unit offers excellent heat and shock resistance. This crystal features a 32.768kHz nominal frequency, ±20 x 10-6 frequency tolerance, 1μW maximum absolute maximum drive level, and 1.5pF typical shunt capacitance. Typical applications include PC, tablet, module, wearable, and sub-clock functions for various microcontrollers.