PZU3.9DB2,115

A PZU3.9DB2,115 is an array of Zener diodes typically used for voltage regulation, surge protection and AC/DC or DC/DC voltage stabilization. It is a 3-pin device, with a SOD-323 case similar to the familiar SOD-123 but with a slightly larger package size of 3.9mm x 2.1mm. It consists of 11 series-strung Zeners connected between the center (signal) and "pull down" pin, with the "pull up" pin connected to a higher voltage. This arrangement creates a voltage regulating device with improved performance for certain applications.

The PZU3.9DB2,115 works on the same principle as a single Zener diode, in which a reverse-biased Zener diode that is placed in series with a voltage source. When the voltage source is equal to or greater than the breakdown voltage of the diode, the diode begins to conduct, allowing current to flow from the source through the diode. The current flow through the diode limits the voltage across the diode, thus providing the voltage regulation.

In the case of a PZU3.9DB2,115, the array of 11 Zeners is connected in series between the signal and “pull down” pins, creating a voltage drop across the array of 11 Zeners that is slightly less than 0.8V per diode. The voltage rating of the diode is 115V and the maximum power that the array can handle is 0.32W. The “pull up” pin is connected to a higher voltage, typically 12V or 24V, depending on the application. This connection provides the source of power for the array and allows the desired voltage to be supplied to the output when a load is connected between the signal and "pull down” pins.

The voltage regulation characteristics of the PZU3.9DB2,115 depend on the application and the connected load. In most cases, a load connected to the output of the array will cause the voltage to drop, which can be used for voltage simplification and stabilization applications. When used for AC/DC applications, the array can provide a regulated output voltage even if the input voltage varies, by controlling the flow of current through the diodes.

In DC/DC applications, the array can be used to step-down a higher voltage to an output voltage that is lower than the input voltage. This is done by varying the current through the diodes, which changes the overall voltage drop across the array.

The PZU3.9DB2,115 can also be used for surge protection applications, as it can effectively clamp the input voltage during lightning strikes or other transient voltage events. This protection is provided by the Zener diodes in the array, which conduct in a reverse direction and limit the voltage across the diodes to the Zener voltage.

The PZU3.9DB2,115 can be a versatile and cost-effective solution for applications requiring voltage stabilization or surge protection, such as in automotive and commercial applications. With its small package size, easy installation and reliable performance, it can be an ideal choice for those applications.