402F240XXCJT

Crystals are essential components in many electronic circuits, with applications ranging from timing, alarm triggering, communication and RF circuits. In particular, the 402F240XXCJT crystal is a reliable and cost efficient workhorse of the industry, with many companies having used it for decades. Let us now take a dive into the 402F240XXCJT application field and working principle.

General Characteristics

At a first glance, the 402F240XXCJT is an omnidirectional crystal package, with an overall size of 4.4 x 2.4 x 1.7mm, and a passivated ceramic surface mount. It features principal frequencies of 3.57945MHz and 14.7456MHz, with a choice of two different frequency tolerance options, H ±30ppm and M ±50ppm. Operating temperature range is -40 to +85c and the typical aging rate is 3ppm per year.

Application fields

The 402F240XXCJT crystal package is usually used in watch movements and RF applications. The small size and low cost make this crystal a popular choice for low power yet precise timing. In watch movements, the 402F240XXCJT crystal replaces the conventional quartz and resulting in prolonged service life in comparison. As for the RF applications, it is used in small form factor solutions such as microcontrollers participating in short-range wireless communications, Bluetooth, and 2.4GHz ISM applications.

Working Principle

The 402F240XXCJT crystal operates according to a common crystal oscillator circuit. The quartz substrate is chosen to inscribe the frequencies of operation, and it is connected to two conductive plates, where the electrodes are integrated. The quartz vibrates at a consistent frequency when an electrical distance is applied between the two electrodes. The frequency stability is provided by a small quartz crystal, and when the voltage is applied, it changes in size, allowing the crystal oscillator to keep its precision even when the temperature changes.

Conclusion

The 402F240XXCJT crystal is an efficient choice of an electronic component with a wide range of applications. With a small footprint and reliable timing, this crystal package is useful in watch movements and RF communications, providing an excellent combination of small size, low cost, low power consumption and high performance. And the working principle involved is fairly straightforward, relying on a small quartz crystal and the variation of the electrical distance between the two electrodes.