Series:	402
Packaging:	Tape & Reel (TR)
Part Status:	Discontinued at Digi-Key
Type:	MHz Crystal
Frequency:	37.4MHz
Frequency Stability:	±10ppm
Frequency Tolerance:	±10ppm
Load Capacitance:	9pF
ESR (Equivalent Series Resistance):	60 Ohms
Operating Mode:	Fundamental
Operating Temperature:	-20°C ~ 70°C
Ratings:	--
Mounting Type:	Surface Mount
Package / Case:	4-SMD, No Lead
Size / Dimension:	0.079" L x 0.063" W (2.00mm x 1.60mm)
Height - Seated (Max):	0.022" (0.55mm)

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Crystals: 402F37411CJT Application Field and Working Principle

Crystals are essential in a variety of electronic devices, most notably in clocks and timers. A typical crystal comprises of a quartz wafer that is tone-cut at a certain angle and is then mounted in the DIP (Dual In-line Package). The 402F37411CJT crystal is one such popular crystal that is currently in use in many applications. With a typical frequency range of 20-40MHz, this quartz crystal is widely used in industrial electronics and communications systems. The fundamental concept of a quartz crystal is that any quartz crystal will vibrate at its own chosen frequency when excited by an electrical signal. It is these properties that make quartz crystals suitable for use in timer circuits, frequency counters, and in the design of actual clocks and watches. The 402F37411CJT crystal comprises of six pins, which will have the following functions. Firstly, it has pins 1 and 6 which will be connected to a voltage supply. This voltage energises the piezoelectric quartz crystal which will then vibrate at a frequency set by the thickness and size of the quartz wafer. To ensure that the signal is only emitted in a single direction, pins 1 and 6 will be connected to the same supply voltage but in opposite polarities. Usually this voltage will be 3.3V or 5V. Next, pin 2 and 3 will be connected to the "load capacitor" which aids in adjusting the frequency output of the crystal. This load capacitor is basically a dampener and its values define the frequency of the signal that will be generated. Finally, pins 4 and 5 will be connected to the output pads of the crystal oscillator. Pin 4 operates as an inverting output, whereby the signal will be inverted from the incoming signal. Pin 5 on the other hand operates as a non-inverting output, which mirrors the incoming signal exactly. Apart from being used in clocks and timers, quartz crystal oscillators can also be employed in microprocessors and other microelectronic devices. They are now being used in modern microprocessors, where the clock circuit often utilises a quartz crystal. This quartz crystal will ensure a steady and consistent clock signal, thereby ensuring that a microprocessor is able to work continuously without any problems. In summary, the 402F37411CJT crystal is a quartz crystal oscillator designed to be used in a variety of different applications. It has six pins and works on the principle of a quartz crystal vibrating at a predetermined frequency when excited by a voltage. It is these properties that make quartz crystals so popular, and the 402F37411CJT is one of the most popular quartz crystal oscillators today.

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