USB50815/TR13 Circuit Protection

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TVS - diodes are electrical components that are used to protect circuits from high transients caused by electrostatic discharge (ESD), lightning or even the surge of pressurized liquids. The USB50815/TR13, known as a Uni-directional Transient Voltage Suppressor (TVS) diode is an excellent choice for applications involving relatively low-power protection from transients.

This device is ideal for protecting a wide variety of electronic equipment, specifically communications and audio/video equipment. It is largely utilized in situations involving high-voltage capacitive transients, such as overvoltage spikes and ESD. Capable of working up to 581 Volts peak, this diode has proven its ability to withstand a high number of transients and repetitive ESD pulses, granting long-term reliability to the circuits they are installed in. In regard to performance parameters, this diode has a slightly higher clamping voltage than other TVS diodes, and it will generally begin conduction at 8.9V.

In terms of environmental conditions, the USB50815/TR13 can operate at temperatures ranging between -55 °C and approximately 125 °C (junction temperature), and is highly resistant to thermal shock, thus making it suitable for compliance with military specifications. Its construction is in compliance with the standards of IEC, UL and RoHS, and meets the specification of ESD contact discharge of 12 kV (HBM), as detailed in Mil Std 883G - method 3015.7.

In terms of application fields, this diode is generally used in medical, automotive, industrial, home appliances, and telecommunication equipment, as an ideal device for suppression of surges and ESD. It can also be used in communication and other reception line protection circuits, where it provides transient protection and ESD suppression.

The working principle behind theUSB50815/TR13 is fairly simple. Its design includes a pair of Zener diodes connected in reverse-parallel and capacitively coupled. This construction allows the device to shunt transient events while constructing a minimal voltage drop across it. As the transient spikes are measured against the device’s clamping voltage, the Zener diodes will conduct the required current to shunt away the over-voltage, and consequently decrease it to safe levels. The rate of reaction of the device depends on its physical characteristics, such as the capacitance, the breakdown voltage of the Zener diodes, the intrinsic diode junction capacitance, and the lead length and ground plane characteristics.

In closing, it is clear that the USB50815/TR13is an excellent choice for surge protection of low-power applications, due to its great performance and reliable parameters. It is highly applicable for a series of applications involving both surge and over-voltage protection, as well as its compliance with military specifications. The working principle behind its operation is quite simple, and can be understood in a matter of minutes.

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