ZXTR20 High-Voltage Linear Regulators Diodes Inc. ZXTR20 High-Voltage Linear Regulators integrates a transistor, Zener diode, and resistor. These regulator transistors are available in various package options and minimize the PCB area. The ZXTR20 transistors regulate with 5V, 8.2V, and 12V nominal output at 15mA. These transistors are designed for use in high voltage applications where standard linear regulators cannot be used. Applications include networking, telecommunications, and Power over Ethernet (PoE).