SMBJ85CD-M3/H Circuit Protection

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TVS (transient voltage suppressor) diodes are one of the most important devices for protecting sensitive components from electrostatic discharge, spikes, and other related transients. The SMBJ85CD-M3/H is a unidirectional transient voltage suppressor sub-family from the SMBJ series. This type of device can be used to protect components from voltages up to 85V and can handle a maximum peak surge of 2.5A.

The most common application areas for the SMBJ85CD-M3/H are in automotive, industrial, and consumer applications as it is able to handle a wide range of voltages and currents. The device is particularly useful where higher currents are required, such as with automotive ignition systems, motor controllers, and IGBT power sources. In these applications, the SMBJ85CD-M3/H can limit the voltage and current in order to safeguard sensitive components.

The working principle of the SMBJ85CD-M3/H is based on the avalanche breakdown voltage of the two Zener diodes connected in anti-parallel to form a Diode Junction isolated from each other. The diodes are connected in series with a third junction which is used to control the breakdown voltage. When a voltage is applied across the two diodes, the voltage can be increased almost infinitely until it reaches the avalanche voltage, at which point the current flowing through the two diodes will decrease rapidly, limiting the voltage to the breakdown voltage.

One advantage of the SMBJ85CD-M3/H is its fast response time which allows it to protect sensitive components from fast transients such as lightning or EMI/RFI pulses. In addition, the device can be used in parallel to provide additional protection in applications which require higher current ratings.

The SMBJ85CD-M3/H is an extremely versatile device, and is widely used in applications where fast response times and high surge capabilities are important. It is a great choice for automotive, industrial, and consumer applications that need protection against high voltages and transient surges.

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