MSMBJ85CA

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TVS (transient voltage suppression) diodes are increasingly being used in consumer electronics, military and industrial equipment. Their primary purpose is to absorb voltage transients or surges, which are sudden increases in voltage caused by events such as lightning, power line faults and electrostatic discharge (ESD). The MSMBJ85CA is a member of the Multi-Element Suppression Diode (MESD) family developed by ON Semiconductor. This ranges from tiny 1-legged chips to higher power two- and three-legged assemblies, and it\'s even possible to link multiple devices in parallel to create a more efficient suppression system. The MSMBJ85CA is particularly well suited for data line protection and general consumer / industrial electronics applications, as it has a unidirectional low capacitance design.

The MSMBJ85CA combines two elements in one package; a Zener Diode, which works according to the avalanche breakdown principle, and a paired antiparallel diode, which works in the opposite direction to the Zener Diode. The antiparallel diode is reverse-biased, allowing it to ‘sacrifice’ itself to any voltage clamping effects. This helps to reduce the overall component size, which is more cost-effective for many applications.

The Zener Diode begins to conduct before the avalanche diode when the applied voltage reaches the preselected breakdown level. Thus, the Zener Diode clamps the voltage at that level for transient voltages. While the avalanche diode is reverse biased, it turns on when the breakdown threshold is exceeded, allowing it to conduct the transient. This prevents it from causing components to either burn out or become damaged as it dissipates the energy of the transient.

To illustrate the working principle of the MSMBJ85CA, let\'s take a look at a surge caused by lightning. When lightning strikes, the thundercloud produces a huge electric surge which passes through the air and travels through power lines, phone lines and other conductors. Without protection, this surge can overload circuits and cause damage or even burn out components. This is where the MSMBJ85CA steps in.

The MSMBJ85CA surge suppressor is designed to limit both the voltage and current of the surge, so that it can be safely dissipated. When an excessive surge of voltage is detected, the Zener Diode begins to conduct, clamps the voltage at the pre-selected voltage, and keeps it constant as the surge passes. This helps to maintain the integrity of the components by preventing any further increase in voltage. At the same time, the paired antiparallel diode will begin to conduct, providing a shunt path for the current to be safely dissipated. This helps to reduce the heat generated by the surge, thus protecting the components from sustained damage.

The MSMBJ85CA TVS Diode is an ideal choice for a wide range of applications, including consumer electronics, military, industrial and automotive electronics. Its low capacitance design ensures that it won\'t interfere with data transmission speeds, making it an excellent choice for data line protection. The device is tested up to 3kV and meets the GR-1089-CORE transient response requirements thanks to its combination of Zener and avalanche suppression. It is also UL approved for use in up to 600V systems.

In summary, the MSMBJ85CA is a robust, reliable and cost-effective solution for protecting against voltage transients and surges. Its low capacitance design minimizes interference with data transmission, making it ideal for protecting high-speed data lines while still providing reliable voltage regulation.

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