SMAJ51ATR Circuit Protection

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The SMAJ51ATR is a Transient Voltage Suppressor diode, also known as a TVS diode, which mainly provides effective protection for sensitive electronic components from transient overvoltage disturbances.

It has a low profile, small size, and is available in the 5.0V voltage level with an operating diode voltage ranging from 5.0V to 5.6V, making it a great choice for portable and LPTV devices where a small size is important. It also has a very low leakage current rating, making it ideal for applications that require a low-impedance connection.

The SMAJ51ATR is designed with a ceramic capacitance on the anode pin to provide better transient voltage clamping for fast transient voltage spikes. It also utilizes a trench-style diode to withstand up to 1500W maximum surge power. The maximum dynamic threshold voltage at a rate of change of 13.33V/ns is 32V.

This type of TVS diode is typically used in mobile devices, portable electronics, and automotive applications to protect sensitive components from overvoltage or ESD transient pulses. It can also be used in applications where a low-impedance connection is required to provide maximum protection. The SMAJ51ATR is a unidirectional TVS diode which is also fast and bidirectional in nature. It has a very low leakage current rating, and its maximum peak pulse power rating is 500W to 1500W. It is also available with a single or dual-row contact arrangement.

As far as the working principle is concerned, the SMAJ51ATR TVS diode is a zener-controlled silicon avalanche diode with a junction field effect structure. The avalanche breakdown happens when the PN junction is subjected to a reverse bias voltage. When the junction breakdown voltage is exceeded, a large current starts to flow through the junction due to the avalanche multiplication of minority carriers. This current is limited by the built-in zener diode, hence the name "zener-controlled silicon avalanche diode".

When a transient voltage spike is encountered, the SMAJ51ATR reacts almost instantly and clamps the voltage within the designed operating voltage range. The ceramic capacitance on the anode pin enhances the device\'s transient voltage response characteristics. This helps to ensure that the current does not exceed the maximum allowed current.

The SMAJ51ATR has been designed to provide effective protection against overvoltage and ESD transients. Its low profile, small size, and low leakage current rating make it a great choice for portable and LPTV applications. It is also available in single or dual-row contact configurations, making it easy to integrate into existing layouts.

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