1PMT5950A/TR13

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The 1PMT5950A/TR13 is a single Zener diode which is specifically designed for the general rectification and protection of low voltage circuits. This diode type is generally available in an axial-leaded SOT-23 package and uses an epoxy resin as its main construction material. It offers a reverse voltage of 13V, a current rating of 0.5A and a typical Zener impedance of 32Ω.

The primary application field of the 1PMT5950A/TR13 diode is for voltage regulation and clamping, as in applications where a shift in the output voltage is undesired. This is achieved by means of the device\'s Zener voltage, which is the voltage at which the diode may turn into a reverse breakdown mode and establish a constant voltage level regardless of current or temperature fluctuations. The most common scenario for this type of protection is the connection of a VCC rail of digital logic sensing nodes to a lower power supply, such as batteries, such that the logic node functions as expected.

The Zener diode also has the added benefit of being bidirectional, meaning that it will clamp voltage levels in either the positive or the negative direction. In addition, it can be operated as a voltage reference in circuits with high-impedance loads, such as current-sensing signals. This type of diode also provides electrical protection from excessive surges in the forward direction and is a preferred solution wherever protection is required against potential dangerous fault currents.

The working principle of the 1PMT5950A/TR13 diode is based on the applied physics of semiconductor materials. When a voltage above the Breakdown voltage level is applied to the diode, current begins to flow through the PN junction. This current is then used to generate a voltage drop across the impurity-induced energy band gap in the semiconductor material. This voltage drop is essentially the Zener voltage of the diode.

In addition, the diode is also configured with a reverse-biased PN junction. When the reverse bias voltage is below the Breakdown voltage, the PN junction is reversed-biased and no current flows, essentially diode is in the "OFF" state. However, when the reverse bias voltage exceeds the Breakdown limit, the PN junction then turns ON and current begins to flow, creating a voltage drop across the PN junction.

The Zener voltage of the 1PMT5950A/TR13 is designed to be at a specific levels so that it will permit a precisely defined amount of a current through the diode and dropping the voltage of the specified levels. This voltage then acts to prevent the voltage from rising above a certain level, allowing the diode to act as a voltage regulator and protecting the circuit from overvoltage fault scenarios.

The above-described principle of action also explains why the Zener diode can be used for a variety of applications, such as for the transient protection of circuits, low-voltage clamping, voltage regulation, and voltage reference. This makes them an ideal component for those looking for robust protection solutions of low power supplies or for an overriding voltage reference in high input impedance applications.

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