ZC933TA Discrete Semiconductor Products

Series:	--
Packaging:	Tape & Reel (TR)
Lead Free Status / RoHS Status:	--
Part Status:	Obsolete
Moisture Sensitivity Level (MSL):	--
Capacitance @ Vr, F:	12pF @ 4V, 50MHz
Capacitance Ratio Condition:	--
Voltage - Peak Reverse (Max):	12V
Diode Type:	Single
Q @ Vr, F:	150 @ 4V, 50MHz
Operating Temperature:	--
Mounting Type:	Surface Mount
Package / Case:	TO-236-3, SC-59, SOT-23-3
Supplier Device Package:	SOT-23-3
Base Part Number:	ZC933

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.Variable Capacitance (Varicaps, Varactors):Diodes are used in electronic circuits to process voltages and currents. One type of diode that is used for RF application is known as the variable capacitance diode, also known as a varicap, varactor or varicap diode. Variably capacitive diodes, such as the ZC933TA, are used in oscillators and filters running at various radio frequencies as well as tuning and frequency modulators because of their ability to vary the capacitor value over a range dependent on the magnitude of reverse bias applied to the diode. The physical construction of a ZC933TA is that of a two terminal diode. When the reverse bias voltage is increased, the capacitance of the diode decreases and when the reverse bias voltage is decreased, the capacitance increases. This relationship is represented in the characteristic curves of the diode as seen in Figure 1. As the reverse bias voltage increases, the capacitance of the diode decreases which is known as capacitance depletion. The capacitance of a diode is dependent on multiple factors including, but not limited to, voltage, temperature, and frequency of the signal, thus making it ideal for use in RF applications. The concept of capacitors can be linked to the basic operation of an electric field in a circuit, with an electric field being created by an applied voltage. The ZC933TA, like any other capacitor, stores energy between the terminals due to the field, and the capacitor only passes an AC component of a particular frequency while blocking the DC component of the signal. However, the capacitance of the ZC933TA is not constant, but instead changes in response to a reverse bias voltages, producing different AC component amplitudes of the signal.When selecting a ZC933TA diode, there are some important parameters that should be taken into account such as: operational frequency range, operating temperature, capacitance range, maximum reverse bias voltage and maximum DC current. These values are critical to the proper operation of the device, as the wrong parameters could result in poor performance and reliability of the product. In most applications, the ZC933TA diode is used as either a voltage-tuned oscillator or as a voltage-tuned bandpass filter. In the former, the reverse bias voltage is applied directly to the diode terminals, whereby the capacitance of the diode is tuned by the voltage applied. In the latter, the reverse bias voltage is connected to the inductor and capacitor of the filter, and the resonant frequency of the filter is then adjusted by the voltage applied. In conclusion, the ZC933TA diode is a variable capacitance diode ideal for RF applications. These diodes allow for variable tuning of oscillators and filters, thus making them ideal for use in RF circuit designs. Careful consideration should be taken when selecting the ZC933TA, as its optimum performance is dependent on the parameters of the device.

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