BZX55C4V7-TR Discrete Semiconductor Products

Series:	Automotive, AEC-Q101
Packaging:	Tape & Reel (TR)
Part Status:	Active
Voltage - Zener (Nom) (Vz):	4.7V
Tolerance:	±5%
Power - Max:	500mW
Impedance (Max) (Zzt):	60 Ohms
Current - Reverse Leakage @ Vr:	500nA @ 1V
Voltage - Forward (Vf) (Max) @ If:	1.5V @ 200mA
Operating Temperature:	-65°C ~ 175°C
Mounting Type:	Through Hole
Package / Case:	DO-204AH, DO-35, Axial
Supplier Device Package:	DO-35

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Diodes – Zener – Single: BZX55C4V7-TR Application Field and Working Principle A Zener diode is a type of diode that ideally operates in reverse breakdown mode. It is a two-terminal device which consists of p-n junction. The BZX55C4V7-TR is a single, medium-power zener diode that is hugely popular in a variety of applications.Applications BZX55C4V7-TR Zener diodes have many applications when it comes to providing a consistent output voltage despite changes in input voltage. This feature makes them ideal for voltage-regulated circuits and surge protectors. As mentioned earlier, BZX55C4V7-TR zener diodes are used in a wide range of applications including:

• As voltage references in a number of applications
• Prebias protection for CMOS devices
• Clamping circuits for semiconductor protection
• Surge protection for power supplies
• Rectifier and switching applications
• Supplying constant voltage to other components
• Clipping and voltage-regulation circuits

Working PrincipleThe principle of working with BZX55C4V7-TR Zener diodes is based on the fact that when voltage is applied to the diode in reverse-bias condition, a high electric field appears at the junction of the device. This allows depleted electrons to gain energy and cross the depletion region as electrons. As a result, a large number of electrons cross the depletion region and appear on the other side of the device, which can lead to a large current flow. In order to regulate this current, the device is designed in such a way that the reverse breakdown voltage remains consistent even after the current flow. This helps in maintaining a constant output voltage.In the forward bias condition, BZX55C4V7-TRs operate in the same manner as a normal diode, allowing current to flow from the anode to cathode and blocking current from the cathode to anode. The Zener voltage is only observed when the diode is reverse biased. Conclusion BZX55C4V7-TR is a single, medium-power Zener diode that is highly beneficial in many applications. It is used for clipping, voltage regulation, prebias protection, and surge protection in power supplies. It is also used for voltage reference and rectifying switching applications. The working principle of BZX55C4V7-TR Zener diodes is based on the reverse breakdown voltage of p-n junctions, which helps in maintaining a constant output voltage.

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