BZX84J-C18,115

Series:	Automotive, AEC-Q101
Packaging:	Tape & Reel (TR)
Part Status:	Active
Voltage - Zener (Nom) (Vz):	18V
Tolerance:	±5%
Power - Max:	550mW
Impedance (Max) (Zzt):	20 Ohms
Current - Reverse Leakage @ Vr:	50nA @ 12.6V
Voltage - Forward (Vf) (Max) @ If:	1.1V @ 100mA
Operating Temperature:	-65°C ~ 150°C
Mounting Type:	Surface Mount
Package / Case:	SC-90, SOD-323F
Supplier Device Package:	SOD-323F
Base Part Number:	BZX84JC18

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Introduction

The BZX84J-C18 is a Zener diode which is a single component in a discrete package. A Zener diode is a special type of diode which is designed specifically to control voltage, allowing it to be regulated within a certain range. It finds application in a variety of electronic devices, sometimes as part of power supply circuits but also as voltage shunt regulators, voltage clippers and reference voltage generator.

Design

The particular BZX84J-C18 model is a single Zener diode. It is constructed in a DO-35-C package, a very small 2-lead axial device which features a glass body, epoxy-sealed case and nickel-barrier ohmic contact electrodes. The package is suitable for use in both through-hole and surface-mounted applications.The specific device has a maximum voltage rating of 18V and a power dissipation of 500mW. The failure rate is 0.2%/1000 hrs. Its reverse voltage characteristic is designed for an 18V breakdown as well as a knee voltage of 6.1V. This gives it an impressive dynamic impedance of less than 2 ohms throughout its operating range. The dynamic impedance is further enhanced by the device\'s low junction and reverse leakage currents.

Ingredients

The BZX84J-C18 is constructed from a variety of materials. The core of the device is made from a heavily-doped N-type semiconductor material known as N-Silicon. This is then encased in an inert glass shell which insulates the metal contact electrodes, preventing electrical short circuits.The metal electrodes are known as ohmic contacts and consist of a nickel-barrier and an outer layer of chromium or copper. The use of nickel-barrier metal ensures that the metal contact layers are electrically isolated from each other.Finally, an epoxy is used to protect the diode, ensuring that the device is resistant to moisture and other contaminants.

Working Principle

The key to a Zener diode functioning is its specially-designed reverse voltage characteristic. When the device is reverse-biased, a very low level of current begins to flow, known as leakage current. As the voltage increases, the leakage current increases exponentially until it reaches a point known as the breakdown voltage, at which point a very large current begins to pass, known as avalanche current.Above the breakdown voltage, the voltage remains constant despite the current passing through the diode. It is this controlled breakdown which allows Zener diodes to be used for voltage regulation.

Applications

Zener diodes like the BZX84J-C18 have a broad range of uses in electronics and electrical engineering. The most common application is as part of a power supply circuit, in which it is used to limit the voltage supplied to the load. This can be helpful in a number of applications, such as providing current protection and avoiding short-circuit damage.Other applications include voltage clamping, which controls the maximum peak-to-peak voltage in AC applications, and voltage references, which provide a stable voltage used to calibrate other circuits.In addition, the high reliability and stability of Zener diodes make them ideal for use in medical equipment and other applications which require a steady and reliable voltage supply.

Conclusion

The BZX84J-C18 is a single-component Zener diode which is designed for a variety of applications. It is constructed from a variety of materials and has a special reverse voltage characteristic which allows it to be used for voltage regulation. These features make it ideal for use in power supply circuits, voltage clippers and voltage references as well as other applications which require a reliable and precise voltage supply.

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