SMA5J12C-E3/61

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TVS (Transient Voltage Suppressor) diodes are devices that are designed to stop overvoltage events on a protected electronic system or circuit. These devices are typically small in size and incorporated into the printed circuit board of the device that needs protection. The SMA5J12C-E3/61, manufactured by Littelfuse, is a unidirectional TVS diode that is made specifically for 5V applications. It specifically offers ESD protection up to +/- 30kV, short circuit and overvoltage protection. It is available in SMD (Surface Mount Device) package in DO-214AB.

Application Field

The SMA5J12C-E3/61 TVS diode is most commonly used in 5V application and is popular in the automotive industry. It can be used to safely and reliably reduce the energy associated with electrical transients in automotive electronic systems. It is also suitable for variety of junction-isolated distributed transient voltage protection applications both in commercial and automotive environments.

The SMA5J12C-E3/61 is especially useful in automotive systems that are exposed to extreme conditions such as temperature changes, water ingress and humidity. It is highly reliable and proven to provide superior protection against ESD, transient overvoltage, and short-circuit events.

Working Principle

The SMA5J12C-E3/61 TVS diode works by clamping the voltage within a specified range. The device contains a voltage clamping structure that becomes activated when the potential between the anode and cathode exceeds a certain value. When the cathode voltage becomes higher than the clamping voltage, the TVS diode diverts the excess current generated by the overvoltage away from the protected circuitry. The voltage returned to the protected circuitry is a controlled wave form with much less energy than the original overvoltage.

The device also contains an internal impedance element which reduces the amount of current that can pass through the diode, thus protecting the connected circuitry. The device is also designed with a fuse like structure that will “open” the circuit if a large overvoltage or short circuit is detected. Once the circuit is opened, the device can be “reset” by removing the overvoltage or short circuit.

The SMA5J12C-E3/61 TVS diode also features two additional built-in protection functions. It incorporates a “zero-bias temperature coefficient” which adjusts the clamping voltage adjusted to the temperature of the environment. This ensures that the device is always capable of providing sufficient protection against voltage spikes. The device also has an inrush current limiting capability which limits the amount of current that can pass through it. This ensures that transient high current spikes do not damage the device.

In conclusion, the SMA5J12C-E3/61 TVS Diode is an effective and reliable device that can protect printed circuit boards and other electrical systems from dangerous overvoltage and transient voltage spikes. It offers superior protection in severe conditions and is suitable for a variety of automotive and commercial applications.

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