BZX55C18_T50R

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Obsolete
Voltage - Zener (Nom) (Vz):	18V
Tolerance:	±6%
Power - Max:	500mW
Impedance (Max) (Zzt):	50 Ohms
Current - Reverse Leakage @ Vr:	100nA @ 14V
Voltage - Forward (Vf) (Max) @ If:	1.3V @ 100mA
Operating Temperature:	-65°C ~ 200°C
Mounting Type:	Through Hole
Package / Case:	DO-204AH, DO-35, Axial
Supplier Device Package:	DO-35

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Diodes - Zener – Single

The BZX55C18_T50R is a single Zener diode that is designed to operate at a maximum power of 0.5 watts. It is a PN junction diode, which means it is made from two layers of doped semiconductor material; a positive layer, which is more heavily doped, and a negative layer, which is more lightly doped.The diode has two terminals; the anode and the cathode. The anode is the more positive voltage terminal, and the cathode is the more negative voltage terminal. When the anode is positive with respect to the cathode, the diode is said to be forward biased and it will then allow current to flow. Conversely, when the cathode is positive with respect to the anode, the diode is said to be reverse biased and will prevent or restrict the flow of current.The BZX55C18_T50R diode has a reverse breakdown voltage of 18V, which means it will start to conduct when the applied reverse voltage between the anode and the cathode reaches 18V. The relatively high reverse breakdown voltage provides greater protection against voltage spikes in the circuit.In the forward bias mode, the BZX55C18_T50R also operates as a voltage regulator by stabilizing the output voltage, and it can automatically cut off the current in the case of an overvoltage. This makes it very useful in applications requiring stable output voltage such as power supplies, laboratory power supplies and overvoltage protection circuits.The diode is also able to reduce the output voltage of a circuit by feeding it a small amount of current in the reverse bias mode. This application of the BZX55C18_T50R is known as Zener voltage regulation. This is useful for applications which require a voltage lower than the supply voltage, such as transistor gate protection circuits.In summary, the BZX55C18_T50R is a single Zener diode specifically designed to provide stable output voltage in power supplies, reduce voltage in gate protection circuits, and protect other components from voltage spikes. Its relatively high reverse breakdown voltage offers further protection.

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