1SMC120A TR13

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1SMC120A TR13 TVS - Diodes Application Field and Working Principle

TVS diodes, also known as a transient voltage suppression diode, are semiconductor devices used to protect sensitive electronic systems circuitry from damage caused by voltage surges, or electrostatic discharge (ESD). The 1SMC120A TR13 is one such device.

Overview of 1SMC120A TR13

TVS diodes are typically used in electronic systems that are exposed to voltage surges such as automotive, industrial, and aerospace applications. The 1SMC120A TR13 is a unidirectional diode with a reverse stand-off voltage of 12.0V. It is capable of providing protection for high powered transient voltage events up to 12.0V. It is a very low capacitance diode, with a maximum capacitance of only 20 Pf, and it has a maximum clamping voltage of 20.0V. The 1SMC120A TR13 is a fast response device, with a typical response time of less than 1 μs.

How The 1SMC120A TR13 Works

The 1SMC120A TR13 uses reverse biased avalanche breakdown to clamp voltage above its reverse stand-off voltage. When the voltage across the diode exceeds this threshold, the avalanche process begins. This involves the controlled breakdown of the diode and the creation of a path for the surge current to follow, thus limiting the energy that is delivered to the protected electronic system circuit elements. This breakdown voltage is determined by the doping (amount of impurities added to the semiconductor crystal to control electrical properties), the thickness of the semiconductor material, and the distance between the P-N junction.

The 1SMC120A TR13 is designed to react in a very short time when a voltage surge is detected, clamping the voltage potential to a level that will not cause damaging voltages in the protected circuit elements. The device is designed to support both continuous and repetitive transient events while providing a very low capacitance, thus not interfering with signal integrity.

Application Examples

The 1SMC120A TR13 can be used in a variety of applications to protect sensitive components from voltage transients, ESD, and other voltage-related events. One example application includes protecting a USB port from surges caused by a device being plugged in or removed.

Another example is to provide protection for relays, which are vulnerable to voltage spikes and high current transients that could cause a short circuit or other damage. The 1SMC120A TR13 can not only provide effective protection for the relay itself, but also reduce the surge energy applied to the control circuit, thus increasing system reliability.

Conclusion

The 1SMC120A TR13 is a unidirectional TVS diode with a reverse stand-off voltage of 12.0V, and a maximum clamping voltage of 20.0V. It has a maximum capacitance of 20 Pf, and a typical response time of less than 1 μs. The device is capable of providing effective protection from voltage transients, ESD, and other voltage-related events such as USB port usage and relay protection.

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