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Diodes - Zener - Single

ZMM5226B-7 is an application specific, single zener diode that specifically provides sufficient zener voltage to support the BIAS (voltage) needs of an Integrated Circuit (IC). The ZMM5226B-7, typically known and referred to as an "IC Bias" diode, is one of the members in a number of similar diodes that can be used, and are used, in an IC\'s Power Supply Sub-System (PSS), to help provide the desired reference (bias) voltages. This diode is made by a number of different manufacturers and, ZMM being the manufacturer\'s part number, is a very commonly used diode for this purpose.

Application Field

The IC Bias diode series is designed to provide regulated voltage to the many different IC\'s available, especially those found in RF Communications applications. These diodes provide regularly required Negative and Positive Voltage References, like 3.2V, 2.5V, 1.8V, etc. The important thing to note is that the ZMM5226B-7, because of its zener characteristics, is a fairly accurate, repeatable and stable source of voltage to the IC that it supports.

Working Principle

The working principle of ZMM5226B-7 is primarily based on the basics of semiconductor physics. When a voltage is applied across the diode, current easily passes through the diode from the positive side of the voltage (Anode) to the negative side (cathode). However, the opposite is not true since a diode provides "built-in" opposition to the reverse flow of current. This property is called the "Zener Effect," and is at the core of the ZMM5226B-7 and its purpose.

When the zener diode reaches the zener voltage (in the breakdown region) of 5.1V, the diode starts to conduct in the reverse direction. This characteristic is called "reverse breakdown," and is the principle by which the ZMM5226B-7 provides a regulated voltage to the IC that it supports. The zener diode regulates the voltage, regardless of changes in the applied current.

ZMM5226B-7 is rated at 5.1V, with a tolerance of 0.05V. Additionally, the maximum power rating of this diode is 500mW and the maximum forward voltage drop is 0.2V. The diode is also used in switching applications and is available in a variety of package types, such as chip, epoxy, SMD and TO-92.

Conclusion

The ZMM5226B-7 is a widely used single zener diode that conducts when the voltage it sees is above 5.1V. The diode regulates the voltage, regardless of changes in the applied current, and provides very good stability and accuracy. The diode is primarily found in wireless communications and RF applications, but can also be used in other applications, such as switching, where a regulated voltage is required.

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