The sub miniature ECX-1637 is a very compact SMD Crystal. The 2.0 x 1.6 x 0.45 mm ceramic package is ideal for today’s SMD manufacturing environment. ECX-1637 SMD CRYSTAL Request a Sample ECX-1637 SMD CRYSTAL Low Profile 2.0 x 1.6 mm Footprint Extended Temp. Range Option RoHS Compliant DIMENSIONS (mm) OPERATING CONDITIONS / ELECTRICAL CHARACTERISTICS PARAMETERS Frequency Mode of Oscillation Frequency Tolerance Frequency Stability Shunt Capaci.