A Schottky diode is a metal semiconductor diode with a low voltage drop of 0.15V to 0.45V and very high switching speeds,these are also known as Schottky barrier diodes or hot carrier Schottky diodes.

　　Schottky diodes are used in various applications such as waveform shaping,rectification,protection circuits,switching and signal conditioning and there are different families of Schottky diodes.In this article,I will introduce a common type-BAT54A Schottky diode pin configuration and specification parameters and other contents.

　　Basic Concept

　　The BAT54A is a Schottky diode in a surface mount device(SMD)package that provides low on-state voltage drop and fast switching.The device is equipped with a PN connection protection/protection ring for ESD and transient protection,and is also a RoHS-compliant"green"device.

　　The BAT54A is formed by metal-semiconductor PN junctions,and like normal diodes,these are planar Schottky diodes with integrated protection rings.

　　Typically,these Schottky diodes are used in protection and rectification circuits,in low voltage circuits with unacceptable voltage drop during conduction,and in devices that need to be rated for low voltage drop during conduction.It is used in circuits where power efficiency is critical.The BAT54A device is capable of delivering significant current at low voltage drops,thus providing the high efficiency required for battery powered systems.

　　In addition,the BAT54A is designed for recovery(forward conduction to reverse voltage blocking)and uses only 5ns to drive high frequency applications.

　　Pinout

　　The BAT54A Schottky diode is a three-terminal diode as shown below.It is designed with two Schottky diodes as shown below.The three terminals are Cathode 1,Cathode 2 and Anode.

　　Pin 1:Cathode 1,the negative terminal of the 1st Schottky diode,through which current flows from the device.

　　Pin 2:Cathode 2,the negative terminal of the 2nd Schottky diode through which current flows out of the device.

　　Pin 3:Anode,the common positive terminal of the two connected Schottky diodes,through which current flows into the device.

　　Replacement models for the BAT54A Schottky diode include:BAT54 Schottky diode,BAT54S Schottky diode and BAT54C Schottky diode.

　　Specifications

　　BAT54A Schottky diode specifications include the following:

　　Forward voltage drop:150-450mV.

　　Very low conduction loss.

　　Very fast switching speed and high efficiency.

　　RoHS compliant no load device.

　　Maximum forward continuous current is 200mA.

　　Maximum reverse voltage is 30V.

　　Maximum forward inrush current is 600mA.

　　Operating temperature range is-65°C~150°C.

　　Maximum power consumption is 200mW.

　　SMD package available.

　　Low capacitance:10pF f=1MHz,Vr=1V.

　　Main Features

　　Reverse voltage is 30V.

　　Forward current at 25°C is 200mA.

　　Repeated peak forward current is 300mA at 25°C.

　　Non-repeating peak forward current tp<10ms square wave is 600mA.

　　Junction temperature is 150°C.

　　Ambient temperature is-55°C to 150°C.

　　Storage temperature is-65°C to 150°C.

　　The device is mounted on PCBs,single sided copper,tinned and standard packages.

　　Thermal resistance from junction to ambient in free air is 500K/W.

　　The reverse recovery time is 5nS.

　　Forward voltage If(forward current)=0.1mA is 240mV,If=1mA is 320mV,If=10mA is 400mV,If=30mA is 500mV and If=100mA is 800mV.

　　The reverse current at 25V reverse voltage is 2 microamps.

　　Application Circuit

　　The BAT54A Schottky diode operates similarly to any other rectifier diode and can be installed in protection rectifier circuits.Therefore,a typical application circuit for the BAT54A can be shown below:

　　It conducts in the forward bias direction only when the positive anode is connected to a positive voltage and the cathode is grounded.

　　Leakage currents of up to 0.1mA flow in the opposite direction only when the positive anode and cathode are grounded.

　　Under forward bias conditions,a maximum voltage of 1V appears across the device,while in reverse bias,the full supply voltage appears across the device.

　　In the above circuit,the BAT54A Schottky diode is used as a protection diode for the microcontroller.Here the power supply feeds the microcontroller and the diode is connected in series for protection.

　　Main Applications

　　The main applications of BAT54A Schottky diode include the following:

　　Used in AC-DC filters.

　　Used in voltage regulators.

　　Used in ultra-high speed switching applications.

　　Used in protection circuits.

　　Used in protection devices.

　　For Line Detectors.

　　For reverse connection protection.

　　For voltage damping circuits.

　　Summary

　　This is an overview of the contents related to BAT54A Schottky Diode Data Sheet.Typically,Schottky diodes are used for low on-state voltage,low loss of energy and fast recovery time at higher efficiency.These diodes become ideal for semiconductor diodes for a variety of applications such as detector diodes,RF mixers,power rectifier circuits,solar cell applications and many more.