The ECS-.327-12.5-34R-TR is an ultra-miniature SMD tuning fork crystal designed for low-power real-time clock and wireless applications. It operates at a nominal frequency of 32.768 kHz with a frequency tolerance of ±20 ppm at +25°C and features a maximum equivalent series resistance of 50 kO, enabling low-power operation. The device is housed in a compact 3.2 × 1.5 × 0.9 mm ceramic package with a 12.5 pF load capacitance, shunt capacitance of 1.3 pF, and operates reliably across an extended temperature range from -40°C to +85°C with a temperature coefficient of -0.028 to -0.040 ppm/°C². This crystal is ideal for mobile devices, real-time clock circuits, and wireless applications requiring minimal power consumption and compact form factors, with RoHS compliance and tape-and-reel packaging for automated assembly.