DZ23C12-HE3-18

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Introduction

The DZ23C12-HE3 is a special type of diode array, designed to act as a voltage limiter. It is designed to protect circuits from over-voltage conditions, whether due to external voltage spikes or static electricity.

Application Fields

The most common application for the DZ23C12-HE3 is as a clipper in a DC-DC converter circuit. By allowing only voltages within normal operating ranges to pass through, transients and ESD can be prevented. In addition, it can be used to provide an alternative, higher voltage limit in switch mode power supplies (SMPS) or high voltage fly-back converters and boost PFC push-pull converters. Its low reverse recovery time makes it useful in low-power switch mode power supplies where lower power losses are desired. The device can also be used to suppress EMI caused by voltage spikes.

Design

The DZ23C12-HE3 is encapsulated in an SOD-323 package. It has a low total forward voltage of 2.9V, and a low reverse leakage current of 5uA. The device is designed to be used at junction temperatures up to +150°C.

Working Principle

The DZ23C12-HE3 works by clamping the voltage to a set level. When the input voltage goes above this level, the device begins to conduct, and will reduce the output voltage to a safe level. This protection allows the circuit to operate at a higher level of protection, while also providing extended operating life and reliability.

The device works on the principle of dynamic temperature control. As the input voltage rises, the voltage across the device increases. This causes an increase in power dissipation, which in turn causes a temperature rise in the device. This temperature rise will cause the device to start conducting, thus clamping the voltage at a safe level.

Conclusion

The DZ23C12-HE3 is an effective solution for protecting circuits from over-voltage conditions. Its low forward voltage and ESD protection make it ideal for use in DC-DC converters, SMPS and fly-back converters. The device’s dynamic temperature control ensures that the voltage is clamped at a safe level by the time the device starts to conduct. This makes it an ideal solution for protecting circuits from both external voltage spikes and static electricity.

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