1SMA5943BT3G

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Voltage - Zener (Nom) (Vz):	56V
Tolerance:	±5%
Power - Max:	1.5W
Impedance (Max) (Zzt):	86 Ohms
Current - Reverse Leakage @ Vr:	500nA @ 42.6V
Voltage - Forward (Vf) (Max) @ If:	1.5V @ 200mA
Operating Temperature:	-65°C ~ 150°C
Mounting Type:	Surface Mount
Package / Case:	DO-214AC, SMA
Supplier Device Package:	SMA
Base Part Number:	SMA5943

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1SMA5943BT3G Overview

1SMA5943BT3G is a single Zener diode from Vishay’s popular SMA5943BT3G series. This series of Zener diodes are designed for general purpose applications. The 1SMA5943BT3G has a maximum power dissipation of 500mW, a maximum continuous reverse voltage of 43V and an operating temperature range of -55°C to +175°C.

1SMA5943BT3G Application Fields and Working Principle

The primary application of 1SMA5943BT3G is to protect circuits from overvoltage conditions. The reverse voltage of 43V allows 1SMA5943BT3G to act as a regulator, allowing excess voltage to be passed around the Zener diode and around the circuit, thereby protecting it from potential damage. This protection can be particularly useful when powering circuits from an AC source.The working principle of 1SMA5943BT3G is relatively simple. When the applied reverse voltage is below the Zener breakdown voltage, current flows through the diode in the normal way. However, when the applied voltage exceeds the Zener breakdown voltage, the diode begins to conduct a reverse current characteristic of a Zener diode, allowing excess voltage to be diverted away from the circuit and reduced to manageable levels. In addition, 1SMA5943BT3G can be used in various other applications. These include voltage-clamping, voltage-regulation and current-regulation. In voltage-clamping applications, the diode acts as a protection device by limiting the voltage applied to the circuit. In voltage-regulation applications, the diode is used to maintain a constant output voltage. In current-regulation applications, the diode is used to maintain a constant output current.

Conclusion

The 1SMA5943BT3G from Vishay is a versatile single Zener diode with a maximum power dissipation of 500mW and a maximum continuous reverse voltage of 43V. It is primarily used for overvoltage protection and can also be used for voltage-clamping, voltage-regulation and current-regulation. This makes it very versatile and suitable for a variety of applications.

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