The ECS-.327-12.5-34QCS-TR is a very compact SMD tuning fork crystal designed for low-power real-time clock (RTC) applications, featuring a 32.768 kHz operating frequency with a 3.2 x 1.5 mm footprint. It delivers a typical frequency tolerance of ±20 ppm at +25°C, a load capacitance of 12.5 pF, and a maximum equivalent series resistance of 70 kO, with drive levels ranging from 0.1 to 0.5 µW. The device operates across a temperature range of -40°C to +125°C (S option) and exhibits a temperature coefficient of -0.034 ppm/°C² typical, with first-year aging limited to ±3 ppm. This AEC-Q200 qualified, RoHS-compliant crystal is ideal for microcontroller-based timing applications such as STM32 real-time clock implementations, offering reliable performance in automotive and industrial environments with TS16949 certified production.