ECS Inc. — ECX-31B Crystal

The ECX-31B from ECS Inc. is a series of 32.768 kHz tuning fork crystals which provide a stable output over an industrial operating-temperature range of -40ºC to 85ºC.

All versions of the ECX-31B are supplied in an industry-standard, surface-mount 3.2 mm x 1.5 mm x 0.9 mm package with a two-pad footprint, offering an equivalent series resistance of 70 kΩ. As standard, these crystals are specified with ±20 ppm frequency tolerance. A ±10 ppm tolerance option is available.

Various part numbers in the ECX-31B series can be specified to choose load capacitance options of 6 pF, 7 pF, 9 pF or 12.5 pF.

STMicroelectronics recommends ECS timing solutions for use with its STM32 families of microcontrollers and microprocessors. Advice about integrating crystals into STM32-based designs may be found in the ST application note AN2867.