UJA1161T,118 Datasheet/PDFUJA1161T,118, an Interface-Drivers, Receivers and Transceivers, integrates power ESD and electromagnetic interference protection circuit and fuses, focusing on the advanced qualities of high speed and low power and is widely used in automobile industry.
Application Field
The UJA1161T,118 mainly consists of power clamper, ESD protection circuit and EMI filter. With rated voltage of 5V-40V, voltage range of -40V-+60V, standby current less than 8µA, it provides input protection for ECU and integrated power supply, and also provides electromagnetic interference protection and surge protection for the relay power supply of the automatic gearbox.
UJA1161T,118 is an ideal device for the interface of power AC-DC and DC-DC, which can ensure the reliability and accuracy running of the automatic gearbox ECU. Automobile power system is usually an integrated supply system. The UJT1161T,118 can improve the stability by monitoring the current and voltage of the circuit, and thus protect the electronic devices such as ECU and power supply.
Working Principle
The UJA1161T,118 is mainly composed of three main parts: metal oxide varistor, bipolar transistor and ESD protection device. It provides input protection for ECU and other integrated power supply.
The working principle of UJA1161T,118 is as follows: when overvoltage occurs, the reverse current of the protection circuit will increase. At the same time, the voltage of the RCM7119 ESD protection device will also increase, causing the drain and source to enter the saturated region, thus limiting the voltage at the input. The voltage of the RCM7119 ESD protection device will decrease when the voltage returns to normal, the bipolar transistor will recover its original state, thus resetting the protection circuit.
In addition, the RCM7119 ESD protection device of UJA1161T,118 is capable of responding quickly to high voltage transient pulses, providing fast protection for high voltage pulses. The built-in zener diode protection circuit can also provide over-current and over-voltage protection for integrated power supply.
Conclusion
UJA1161T,118 provides stable, efficient and reliable input protection for applications such as automobiles ECUs and integrated power supplies. As a Interface-Driver-Receiver-Transceiver, the working principle of UJA1161T,118 is to monitor the current and voltage of the circuit and provide fast protection for high voltage pulses. The built-in Zener diode can also provide over-current and over-voltage protection for integrated power supply.