SMCJ90CA

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Transient Voltage Suppressor (TVS) diodes are a type of semiconductor component used to protect electronic systems from voltage spikes. The SMCJ90CA is a Series Dual Common Anode TVS Diode in the SMA (DO-214AC) package, and is used primarily for electrostatic discharge (ESD) and surge protection. It offers direct device protection against shocks of up to 50 Amps (8/20μs waveform).

Due to their small size and simplified construction, TVS diodes have become ideal for space restricted designs. The SMCJ90CA model measures 2.45mm x 3.9mm x 1.6mm, making it attractive for applications where size is a constraint. Furthermore, it has an operating temperature range of -55°C to +150°C.

It employs a unique patented Soft Breakdown™ Technology that enables high energy capabilities with a low clamping voltage, offering superior ESD protection and ideal transient suppression characteristics. With its higher transient energy capability, the SMCJ90CA provides an ideal solution for direct protection of signalling lines.

The device is bidirectional, and employs two common anodes with their breakdown voltages being inversely matched so that the highest positive and negative peaks can be clipped by the anode with the appropriate breakdown voltage. This provides a symmetrical clamping action with minimal deviation (<10%).

The SMCJ90CA is available in 12 Volt, 15 Volt, and 18 Volt versions. Across all data modes, the device will respond to an ESD pulse and the peak voltage of the output waveform is greatly diminished. For the 12 Volt model, the peak voltage of the output waveform can be reduced to 4.5 Volts. This can provide a significant level of protection to components that are otherwise vulnerable to ESD.

The device is suitable for protection across a wide range of applications, such as handheld computing devices, laptop computers, cellular phones, digital cameras, electronic control units, cable modems, and so on. Furthermore, the unit also complies with the IEC 61000-4-2 level 4 standard, which give it additional credibility for use in more higher end devices.

In order to gain a better understanding of the SMCJ90CA TVS diode, it is important to consider its working principle. The device consists of two anodes with different breakdown voltages. When the voltage surpasses either of the breakdown voltages, the device will start to conduct electricity. As current passes through the TVS diode, it is then dissipated as heat. This is then followed by a characteristic clamping effect.

Additionally, as the voltage waveform passes, the device returns to a state with no voltage across it. As the device absorbs the spike, it prevents the damage that could have been caused to the component by the overvoltage. As such, the goal of the SMCJ90CA is to absorb the high voltages that can damage the device and protect it from catastrophic failure.

Overall, the SMCJ90CA is an excellent choice for equipment that needs protection from surges in both positive and negative directions. It is particularly suited for small applications where size is a factor and offers superior ESD protection for applications above the IEC 61000-4-2 level 4 standard for ESD. Furthermore, its low clamping voltage, bidirectional design, and small form factor make it an ideal choice for product designers looking for a comprehensive and reliable solution to protect their devices from voltage spikes.

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