MMBZ5256BS-7 Discrete Semiconductor Products

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The MMBZ5256BS-7 is an array of voltage-dependent Zener diodes designed for electronic devices such as television sets, computer monitors, automotive electronics and home appliances. The device consists of eight voltages in a package: 4.7V, 5.1V, 5.6V, 6.2V, 6.8V, 7.5V, 8.2V and 9.1V. Each diode integrates two back-to-back Zener diodes connected in series, forming an insulated-gate bipolar transistor (IGBT)/voltage-dependent resistor(VDR).

The MMBZ5256BS-7 is designed to provide reliable protection against transient overvoltage spikes that result from power outages, power fluctuations, and other similar events. The device is typically used in conjunction with an external low value resistor network, yielding a low leakage current. This low leakage current helps provide protection against inrush current when the device is in use.

The primary application of the MMBZ5256BS-7 is in overvoltage protection in various types of electronic devices. Specifically, the Zener diode array can be used to protect parts of the circuit that are susceptible to voltage surges. For example, it can be used in AC/DC converters to prevent high voltage transients from damaging the device circuitry. It can also be used in automotive applications to limit the high-voltage transients in the electronic control units.

The working principle of the MMBZ5256BS-7 is relatively straightforward. When the input voltage rises above the predetermined Zener voltage for the specific diode, it will break down and divert current away from the protected components. This current is then dissipated into a load resistor. As the voltage continues to increase, the breakdown voltage of the other diodes in the array will also increase, resulting in increased voltage protection across a range of input voltages. As the input voltage returns to normal, the Zener diode array will switch back to its open state, allowing normal operation to resume.

In summary, the MMBZ5256BS-7 is an array of voltage-dependent Zener diodes designed for use in overvoltage protection in various types of electronic devices, such as AC/DC converters and automotive applications. The primary working principle is that the Zener diodes in the array breakdown at predetermined voltages, diverting the current away from protected components and dissipating it into a load resistor. This allows the device to provide reliable protection against voltage surges and other transient events.

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