UNR921EJ0L Discrete Semiconductor Products

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The UNR921EJ0L is a single transistor bipolar junction pre-biased unit from Unisonic Technologies. It is an NPN transistor that is a low voltage device with a low leakage current targeted for use in power-on reset (POR) and level detection applications. The UNR921EJ0L uses a standard 9V collector-base voltage of 2V and built-in bias resistors for easy connection.

The main features of the UNR921EJ0L include its high breakdown voltage, low operating voltage and current, and an ultra-low RDS(ON) value which helps to reduce power dissipation and improve efficiency. In addition, the device also has good stability due to its small output errors and low-voltage temperature coefficient of the collector-base voltage.

The UNR921EJ0L is used in a wide range of applications, including power-on reset and level detection circuits, such as battery management systems, switching power supplies, and Automotive Event Data Recorders (EDRs). In these applications, the UNR921EJ0L is used to detect a low-voltage threshold which triggers the reset of the system, or to detect the voltage levels in various sensors or switches.

The UNR921EJ0L works by having the base resistor connected to a regulated power supply, such as a battery. The base-collector voltage is set at the desired voltage level, and the collector current is monitored. When the desired voltage level is reached, the collector current will drop. This drop in collector current indicates that the pre-biased circuit has been activated, indicating the point at which the circuit needs to be reset. The UNR921EJ0L can also be used to monitor any other voltage level, such as a switch or a sensor.

The UNR921EJ0L has a number of advantages compared to other pre-biased transistors. These include its low operating voltage and current, wide range of bias resistors, fast response time, improved reliability, and high depletion voltage. In summary, the UNR921EJ0L is a reliable, low-voltage pre-biased transistor that is designed for easy connection and use in a wide range of applications.

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