High-performance ultra low-profile tuning fork in compact SMD package

Fox Electronics has developed its most compact watch crystal, measuring just 1.6mm x 1.1mm x 0.5mm (L x W x H). Although smaller in size, the new FX161 crystal operates at many of the same high standards as previous models, making it one of the most efficient tuning forks yet. The crystal’s ultra-low profile and exceptional performance optimize the minimal space available in many portable and handheld applications, including wearable devices, says the company. The new surface mount device (SMD) operates at a frequency of 32.768 kHz. Frequency tolerance is ±20ppm at 25C with a long term of -0.046ppm per Delta C2. Standard load capacitance is 12.5pF, with optional 7pF or 9pF available. The tuning fork ages only ±3ppm in the first year, and features a termination finish of gold over nickel. Overall operating temperature range is -40C to +85C with a turnover temperature range of +20C to +30C and a storage temperature of -55C to +125C. Maximum soldering is 10 seconds at 260C. The new watch crystal sustains a maximum of 90kohm equivalent series resistance and an insulation resistance of 500Mohm at 100VDC, says the company.