SMAJ70C

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The SMAJ70C is a transient voltage suppressor (TVS) diode, a type of device used to protect sensitive electronics from voltage transients caused by lightning, electrostatic discharge, and inductive loads. TVS diodes are frequently used in products ranging from consumer electronic devices to automotive infotainment systems. The SMAJ70C is a popular choice for applications requiring high reliability and low operating power.

The SMAJ70C is a low capacitance, high-temperature, bi-directional TVS diode. It comprises two separate silicon diodes that are connected back to back. This gives the SMAJ70C bidirectional protection, meaning it can clamp transients with either polarity. This makes it suitable for use in data line and AC line protection applications.

The SMAJ70C has a maximum peak pulse power rating of 70 Watts (W) and a surge current rating of 3.5 Amps (A). Its clamping voltage (or breakdown voltage) is 40 volts (V) for a peak pulse applied in either direction. Its breakdown voltage is specified to remain constant regardless of the pulse current or pulse duration. This is due to the SMAJ70C\'s superior capacitance characteristics - specifically, its 31.3pF capacitance at 1MHz.

The working principle of the SMAJ70C TVS diode can be simplified as follows: When an overvoltage occurs, the SMAJ70C passes a surge of current through its two diodes. This results in a voltage drop across the diodes, which clamps the voltage to a safe level. As the surge current flows through the TVS, the voltage across the device increases until it reaches the over voltage breakdown limit. At this point, the two diodes become back-to-back diodes, ending the surge. This voltage clamping process effectively limits the overvoltage, protecting the sensitive electronic components.

The SMAJ70C is suitable for use in industrial, medical, automotive, and consumer electronics applications. It is commonly used in telecommunications, computers, data communications, and automotive infotainment systems. Its rugged design and small form factor make it a great choice for space-constrained applications. Additionally, its low capacitance characteristics make it well suited for use in high-frequency applications.

In summary, the SMAJ70C is a popular bidirectional TVS diode with a peak pulse power rating of 70 W and a breakdown voltage of 40 V. It offers excellent protection from voltage transients and can handle both positive and negative voltages. The SMAJ70C is used in a wide range of consumer, automotive, and industrial electronics applications, making it an ideal choice for cost-conscious designs.

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