The miniature ECX-16R is a very compact low ESR SMD Tuning Fork Crystal. Low ESR ideal for RTC and low power Microcontrollers. ECX-16R 32.768 KHz SMD Tuning Fork Crystal Request a Sample ECX-16R SMD CRYSTAL Lowest in class ESR 1.6 x 1.0 mm Footprint Extended Temp. Range RoHS Compliant Applications: Wireless, COTS, Industrial, & IOT DIMENSIONS (mm) OPERATING CONDITIONS / ELECTRICAL CHARACTERISTICS PARAMETERS Frequency Frequency Tolerance Load .