ECS-.327-12.5-12-C-TR

The ECS-.327-12.5-12-C-TR is a 32.768 kHz tuning fork crystal from ECS Inc., part of the ECX-12 series. It has a nominal frequency of 32.768 kHz with a load capacitance of 12.5 pF and a frequency tolerance of ±10 ppm at +25°C. The equivalent series resistance is 90 kΩ maximum, and the drive level range is 0.1 μW to 0.5 μW. The crystal operates over a temperature range of -40°C to +85°C and can be stored from -55°C to +125°C.

The crystal is housed in a compact 2.0 x 1.2 x 0.6 mm 2-SMD, No Lead ceramic package, suitable for surface mount assembly. It is designed for fundamental mode operation and is ideal for low-power real-time clock applications, including STM32 AN2867 reference designs. The component is RoHS3 compliant with a peak solder temperature of 260°C (max 10 seconds, 2 cycles) and MSL Level 1.

Typical electrical parameters include a motional capacitance of 7.0 fF, shunt capacitance of 1.3 pF, turnover temperature between +20°C and +30°C, and a temperature coefficient of -0.04 to -0.02 ppm/°C². Aging is ±3 ppm in the first year at +25°C. The standard packaging is tape and reel with 3,000 pieces per reel.