1SMB5917BT3

Series:	--
Packaging:	Cut Tape (CT)
Part Status:	Obsolete
Voltage - Zener (Nom) (Vz):	4.7V
Tolerance:	±5%
Power - Max:	3W
Impedance (Max) (Zzt):	5 Ohms
Current - Reverse Leakage @ Vr:	5µA @ 1.5V
Voltage - Forward (Vf) (Max) @ If:	1.5V @ 200mA
Operating Temperature:	-65°C ~ 150°C
Mounting Type:	Surface Mount
Package / Case:	DO-214AA, SMB
Supplier Device Package:	SMB
Base Part Number:	SMB5917

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Introduction

The 1SMB5917BT3 is a Zener diode that is used in diverse electronic applications. The device is a single breakdown diode and is distinguished by its low reverse leakage current. It features a 400mW power rating and an operational temperature range of -65 to +150 degrees Celsius. The 1SMB5917BT3 is suitable for various applications such as voltage regulation and clipping circuits. Its user-friendly characteristics make it a versatile component for use in a range of applications.

Application Field and Working Principle

Voltage RegulationThe 1SMB5917BT3 Zener diode is an efficient voltage regulator device. It is capable of regulating voltage over a wide range by virtue of its highly precise breakdown voltage with a precision of ±5%. This enables its use in digital circuits and other devices that require a very precise voltage. When a wide range of input voltages are applied to the 1SMB5917BT3, the device is able to maintain a constant output voltage that is determined by the breakdown voltage of the device. When the input voltage increases, the diode reduces the load current, thus clamping the voltage and holding the output voltage at the breakdown voltage of the diode.Clipping CircuitsThe 1SMB5917BT3 is also used in clipping circuits. In these circuits, the 1SMB5917BT3 is connected in series with a resistor and/or an inductor. When an input signal that exceeds the breakdown voltage of the diode is applied, the diode will conduct while curtailing the voltage beyond the diode\'s breakdown voltage. The diode acts as a clamp on the output signal, thus preventing it from reaching beyond the breakdown voltage of the diode. Working PrincipleThe 1SMB5917BT3 Zener diode is a hardware component based on the principle of reverse breakdown. It is composed of two regions; the P-region and the N-region, separated by a junction. Under normal conditions, current flows in a single direction, from the P-region to the N-region. But when a sufficiently high reverse bias voltage is applied across the junction, a condition known as reverse breakdown occurs, in which a high current flow will occur in the opposite direction, from the N-region to the P-region. The N-region is doped with an acceptor impurity, and the P-region is doped with a donor impurity, such that when a voltage is applied to the junction, the electrons in the N-region are attracted to the P-region across the junction, thereby creating a small current flow. When the reverse bias voltage applied across the junction surpasses a certain threshold, known as the breakdown voltage, then a large amount of current will flow in the opposite direction. This breakdown voltage of the 1SMB5917BT3 is precise with a precision of ±5%.

Conclusion

The 1SMB5917BT3 is a general purpose Zener diode that is used in a range of electronic applications. It is characterised by its low reverse leakage current and its precise breakdown voltage with a precision of ±5%. It is mainly used for voltage regulation and clipping circuits. The working principle of the 1SMB5917BT3 is based on the principle of reverse breakdown.

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