Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Voltage - Zener (Nom) (Vz):	180V
Tolerance:	±20%
Power - Max:	3W
Impedance (Max) (Zzt):	800 Ohms
Current - Reverse Leakage @ Vr:	1µA @ 136.8V
Voltage - Forward (Vf) (Max) @ If:	1.2V @ 200mA
Operating Temperature:	-55°C ~ 150°C
Mounting Type:	Surface Mount
Package / Case:	DO-216AA
Supplier Device Package:	DO-216AA
Base Part Number:	1PMT5955

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Introduction

The 1PMT5955/TR7 is a type of zener diode. It is a single device, meaning that it is made up of only one semiconductor junction. This type of diode is most commonly used to provide overvoltage protection on circuits, to prevent damage due to power surges.

General Overview

The 1PMT5955/TR7 is a surface-mount diode. It is three-terminal device, with two terminals connected to opposite ends of the semiconductor junction and a third terminal connected to a highly doped layer of the junction. The junction is designed such that it exhibits zener behavior, meaning that the voltage across the junction remains constant, even when the value of current through it is varied.The 1PMT5955/TR7 is available in a variety of packages, such as SOT-223, SOD-123 and SMA packages. The diode operates within a temperature range of -55°C to +150°C. The maximum reverse voltage for the device is 5.6V, with a maximum peak reverse voltage of an 8.3V. The operating currents for each package vary slightly, with the SOD-123 package featuring the lowest operating current at 30mA. The maximum power dissipation for the 1PMT5955/TR7 is 300mW.

Application and Working Principle

The most common application of the 1PMT5955/TR7 is in the protection of electronic circuits and components against voltage spikes. This is achieved by connecting the diode in parallel with the circuit or component to be protected, such that the diode is reverse biased. In this configuration, if a voltage spike occurs, the zener diode acts as an avalanche breakdown diode. This causes the diode to begin conducting, since the reverse voltage across its junction has exceeded the breakdown voltage of the diode. This allows current to flow through the diode, thus providing a path for the voltage spike to be safely dissipated.In some cases, the 1PMT5955/TR7 is used as a voltage reference, in which case it would be connected in series with the desired components. This is accomplished by biasing the diode in reverse, such that the junction is forward biased with a voltage slightly lower than the breakdown voltage. This causes a relatively constant voltage to be produced across the diode, which can then be used to set the voltage of the system.

Conclusion

The 1PMT5955/TR7 is a type of zener diode that is most commonly used for overvoltage protection and voltage reference. It is designed to exhibit zener behavior, meaning that the voltage across its junction remains constant, even if the current through it varies. It is a single device, and is available in several different packages, such as SOT-223, SOD-123 and SMA packages.

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