CDC7631-000

The CDC7631-000 is a diode that belongs to the RF diodes category and finds a variety of applications in communication systems. It is a dual diode with a reverse-polarity pin, meaning that when it is forward-biased, it will establish a rectifying voltage in order to allow the current to flow through the cathode while blocking it at the anode.The CDC7631-000 is a semiconductor diode useful in microwave and RF applications and features a tracking bias configuration as well as a common anode and a common cathode pin. It is constructed from a N-type and a P-type diffused substrate, and measures 5.2 mm x 1.4 mm x 1.4 mm, making it one of the smallest dual diodes on the market. Its primary application is the reception and detection of various types of RF signals, such as those used for terrestrial and satellite broadcasting, cellular telephony, Wi-Fi radio and radio remote control systems. It is also used in filtering and switching applications, such as in mixers, Multi-Coupled Resonators (MCR’s), modulators, routers, signal-shapers and pulse shapers. Additionally, it is especially useful in signal-detection circuitry in order to avoid saturation in signal detection stages to improve dynamic range.Radiotron was the first maker of the CDC7631-000. The working principle of the diode is based on the use of a two-layer substrate. The two layers consist of an N-type diffusion layer and a P-type diffusion layer. When the forward voltage is applied, the current flows from the N-type layer to the P-type layer, producing an electric field. This electric field creates a rectifying voltage and effectively blocks the current from flowing back from the P-type layer to the N-type layer. The rectifying voltage is determined by the magnitude of the applied forward voltage, as well as the junction capacitance between the two types of layers. When the reverse voltage is applied the current does not flow anymore due to the blocking effect of the rectifying voltage. This is why the CDC7631-000 diode is mostly used in signal-detection circuitry in applications where preventing signal saturation is of utmost importance.The CDC7631-000 is a versatile diode with a variety of applications. Its small size makes it very useful when working on densely packed circuitry, while its high tracking bias and common anode and cathode pins reduce the number of components needed in the circuit. Its rectifying voltage is ideal for signal-detection circuitry and filtering and switching applications, thus making it very useful in modern communication systems.Overall, the CDC7631-000 is a very useful diode, capable of providing robust signal-detection and filtering capabilities in RF applications. It is compatible with the most prevalent RF signal formats, making it suitable for a wide range of applications. Its small size and high tracking bias make it a great choice for applications where packing density and signal detection capabilities are both needed.

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