445 Crystals Tusonix/CTS Electronic Components Series 445 Crystals feature a frequency range of 10 - 50 MHz, frequency tolerance ±20 ppm, frequency stability ±30 ppm standard, and an operating temperature range of -40°C to +85°C. Applications include a wide range of commercial applications including notebooks, computer peripherals, audio visual, Bluetooth and USB interfaces, PDAs, and automotive electronics.