DDZ27DS-7 Discrete Semiconductor Products

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Voltage - Zener (Nom) (Vz):	27V
Tolerance:	±2.5%
Power - Max:	200mW
Impedance (Max) (Zzt):	45 Ohms
Current - Reverse Leakage @ Vr:	50nA @ 21V
Voltage - Forward (Vf) (Max) @ If:	900mV @ 10mA
Operating Temperature:	-65°C ~ 150°C
Mounting Type:	Surface Mount
Package / Case:	SC-76, SOD-323
Supplier Device Package:	SOD-323
Base Part Number:	DDZ27

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Introduction

The DDZ27DS-7 is a Single Zener diode, in a SOT-156 package. It is designed to provide a stable voltage reference and protect low voltage components from over-voltage. It is mainly used in power supplies and motor controllers. This article will focus on the application field and working principle of the DDZ27DS-7.

Application Fields

The DDZ27DS-7 is primarily used as a voltage reference and current regulator in power supplies and motor controllers. It is ideal for small-scale applications such as cellular phones, PDAs, and other low-power systems. It is also used in line regulation circuits, over-voltage protection circuits, and flying capacitor balanced line drivers.

Features and Benefits

The DDZ27DS-7 provides stable voltage references with a low temperature coefficient of 27 mV/℃ (Max.) and high accuracy of 2.5%. It also features tight voltage tolerance of ±2.5% and can handle peak power of 400mW. The minimum reverse voltage breakdown is also very low, at 6.8V. The DDZ27DS-7 has a low thermal resistance of 0.7K/W, allowing for high heat dissipation. It also has a low recovery time of 5ns and can operate in both AC and DC circuits. It is capable of operating over a wide range of temperatures, from –55 °C to +155 °C.

Working Principle

The DDZ27DS-7 is a reverse bias diode. When the supply voltage exceeds the breakdown voltage of the diode, a large current flows through the diode. This causes the diode to act as a voltage clamp, limiting the voltage across the diode and protecting the circuit. Because the diode is reverse biased, the current is limited by the reverse biased junction. This current is often referred to as the zener current, and it is regulated by the zener voltage. The zener voltage is determined by the breakdown voltage of the diode and the value of the series resistor. The DDZ27DS-7 can also be used as a voltage regulator by connecting it in series with a resistor. In this configuration, the current through the diode is limited to the zener current, and the voltage across the diode is clamped at the zener voltage. This creates a stable voltage reference for the rest of the circuit.

Conclusion

The DDZ27DS-7 is a single Zener diode, designed to provide a stable voltage reference and protect low voltage components from over-voltage. It is mainly used in power supplies and motor controllers, where its features such as low temperature coefficient and high accuracy are highly valued. This article discussed the application field, features, benefits, and working principles of the DDZ27DS-7.

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