3SMC33A TR13 Circuit Protection

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3SMC33A TR13 is a TVS (transient voltage suppressor) - Diode made by Diodes Inc., a leading supplier of high quality semiconductors and discrete components for diverse and demanding markets. It is a small, fast responding device suitable for various applications in all types of electronic equipment. The device can be used to protect against Electrostatic Discharge (ESD) or Transient Overvoltage conditions. The 3SMC33A TR13 is a bi-directional device, which means it can be used for both supply and/or signal/data protection.

The 3SMC33A TR13 is an unipolar TVS Diode with a fast response time of just 10.0ns. It can absorb multiple ESD hits of up to 30kV contact and 25kV air discharge, and clamp transients within its ± 350V peak pulse power rating. The 3SMC33A TR13 is available in two short leadform packages, the SMA and SMB. Both packages have a low thermal resistance of 1.4°C/W junction-to-ambient, making them ideal for automotive applications.

The 3SMC33A TR13 provides reliable ESD and transient protection for automotive electronics as well as computers, data lines, and general purpose consumer applications. It is an ideal choice for protecting sensitive components, such as audio components, where millivolt signals need to be protected from voltage transients. The 3SMC33A TR13 can also be used to protect against leakage currents, which can cause false triggering of safety devices, as well as to limit any excessive current transients.

The working principle of 3SMC33A TR13 is based on getting very small leakage currents due to the high junction impedance. At varying voltages, the Reverse Leakage Current changes continuously. Upon the application of an external voltage greater than the PIV (peak inverse voltage), the device starts to conduct in the reverse direction. When this happens, a portion of the current is diverted away from the protected circuit. The diverted current is referred to as the “clamp” current.

The junction of the 3SMC33A TR13 is designed so that, during normal operation, the leakage current is held to a minimum, but as soon as the device is exposed to an excessive voltage, the junction impedance is reduced drastically and the device “clamps” the voltage. This allows the device to absorb the ESD energy and suppress the transient voltage.

In conclusion, the 3SMC33A TR13 is a TVS - Diode that is designed to absorb Electrostatic Discharge (ESD) or Transient Overvoltage conditions. It has a fast response time of 10.0ns and can absorb multiple ESD hits of up to 30kV contact and 25kV air discharge. It is an ideal device for use in automotive, computers, data lines, and general purpose consumer applications, where millivolt signals need to be protected from voltage transients. The device can also be used to protect against leakage currents which can cause false triggering of safety devices, and limit any excessive current transients.

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