MMSZ5246B-HE3-18

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Diodes - Zener - Single

MMSZ5246B-HE3-18 is a zener diode, which has wide application field and working principle. It is composed of two diodes connected in series, a zener diode in the center and a normal diode connected in opposition. The zener diode works as an "avalanche diode" when it breaks down, and when the voltage rises beyond its zener voltage, it will let current flow, so it is typically used to provide a constant reverse voltage and to protect electronic circuits from voltage spikes. The other diode, in opposition to the zener diode, works as a current regulator and prevents the too much current surged from the current sources. The protection can preventing from overvoltage and the electrical components from the voltage damage.

Application Fields of MMSZ5246B-HE3-18 Zener

MMSZ5246B-HE3-18 is mainly used in electronics, communication, optoelectronics and other industries. It is also widely used in various fields of power electronics, such as power supply modules, driver stages, surge protection, etc. To ensure the long-term reliable operation of electronic apparatus, MMSZ5246B-HE3-18 can protect sensitive electronic circuits from transient voltage rises, such as laser printer, PC motherboard, inkjet printer, portable DVD, and TV set-top box.

Working Principle of MMSZ5246B-HE3-18 Zener

MMSZ5246B-HE3-18 tapers off the current to the component by dissipating heat. It works as an avalanche diode at the zener voltage. When the voltage rises beyond the zener voltage, typically −2.4 V to −93 V, the diodes stimulate an avalanche effect which causes a high surge of current and large temperature rise. This has two simple functions. It firstly reduces the voltage applied to the component, and secondly it dissipates the maximum amount of heat away from the component.

At normal operating conditions, the two diodes connected in series allow current to flow across the zener diode in the opposite direction, yet not exceeding the zener voltage threshold. When the voltage level rises beyond the zener voltage threshold, the diode breaks down and a large surge of current passes through it, usually more than the forward voltage of the second diode. This then maintains the voltage to the component at the zener voltage, therefore reducing the voltage thus protecting the component from its maximum continuous operating voltage.

Conclusion

MMSZ5246B-HE3-18 provides consistent, safe and fast protection against transient voltage surges, and has a wide application field in many industries, such as electronics, communication, optoelectronics and power electronics. The working principle is simple - when the voltage level rises beyond the zener voltage threshold, the diode breaks down and a large current passes through it, thus maintaining the voltage to the component at the zener voltage.

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