MMBZ5238B-HE3-18

Series:	Automotive, AEC-Q101
Packaging:	Tape & Reel (TR)
Part Status:	Active
Voltage - Zener (Nom) (Vz):	8.7V
Tolerance:	±5%
Power - Max:	225mW
Impedance (Max) (Zzt):	8 Ohms
Current - Reverse Leakage @ Vr:	3µA @ 6.5V
Operating Temperature:	-55°C ~ 150°C
Mounting Type:	Surface Mount
Package / Case:	TO-236-3, SC-59, SOT-23-3
Supplier Device Package:	SOT-23-3

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Introduction

The MMBZ5238B-HE3-18 is a single P-N junction Zener diode, which is able to provide a stable voltage output for a wide range of applications. This diode is designed to operate in the breakdown region, with reverse voltage being held above the breakdown voltage to ensure that breakdown does not happen.

Application Field

One of the most common applications of the MMBZ5238B-HE3-18 is voltage regulation. For example, this diode can be used in a voltage regulator circuit to maintain a constant output voltage, regardless of changes in input voltage. It can also be used in overvoltage protection circuits, where the diode will enable the circuit to protect itself from voltages that are higher than the operating limit.The diode can also be used in current regulation and current sensing applications. When connected in series with a load, it will reduce the voltage drop across the load and allow for a greater current flow. This is especially useful when dealing with low-power components, where a smaller voltage drop can provide the necessary current and still keep the component safe from overheating.Finally, MMBZ5238B-HE3-18 diodes are often used in voltage-clamping circuits, which are used to protect delicate circuitry from high voltages. Such circuits will use the diode to limit the voltage applied to the protected circuitry, ensuring that the maximum voltage is never exceeded.

Working Principle

The MMBZ5238B-HE3-18 diodes are designed to work in the breakdown region. When a reverse voltage is applied to the diode, the voltage will reach a breakdown point, at which point the current increases rapidly. This allows for the clamping of voltages above the breakdown point.When the diode is used in a voltage regulator application, the breakdown point is set at the desired output voltage. The diode will then monitor the input voltage and ensure that it remains below the breakdown point. Any increases in the input voltage will be clamped at the the breakdown voltage, and the output voltage will remain at the desired level.In current regulation applications, the diode will have a predictable pattern of current regularity by using the breakdown point as a limit. The current regulated is limited to the maximum current of the diode, as the voltage will be clamped at the breakdown voltage and no more current can flow.Finally, in voltage-clamping applications, the diode will be connected in parallel with the device being protected. If the input voltage rises above the breakdown voltage, the diode will clamp the voltage, ensuring that the potentially damaging voltage never reaches the device.

Conclusion

The MMBZ5238B-HE3-18 is an extremely versatile and reliable single P-N junction Zener diode. Its ability to operate in the breakdown region makes it perfect for a wide range of applications, from voltage regulation to current regulation and voltage-clamping applications. Its reliability and practicality make it a go-to choice for many circuit designs.

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