SP3118-01WTG

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TVS (Transient Voltage Suppressor) diodes are an integral part of today’s electronics circuit designs and the SP3118-01WTG is an exemplary model. It is a general purpose, low capacitance, symmetrical dual diode array that offers excellent protection against destructive voltage transients that are generated by Electrostatic Discharge (ESD), lightning, inductive loads, and more. This model offers a 500W peak power dissipation capability for 8/20us waveforms.

Application Field

In terms of applications, the SP3118-01WTG is particularly targeted for high speed logic circuits, especially those circuits which must meet stringent ESD immunity requirements. Its symmetrical construction helps to ensure that its response times to overvoltage events are symmetrical and provide double protection during the ESD testing. Another application of this model is in communication systems, where it is used to protect telephone lines, POTS, and high speed data lines. It is also suitable for use in automotive electronics systems, where its low capacitance, high peak power capability, and response time makes it an ideal choice.

Working Principle

The working principle behind this model is quite simple. It consists of two series-connected diodes with the anode terminals attached to a common lead and the cathode terminals attached to a separate lead. When a voltage is applied to the anode leads, the diodes become forward biased and allow current to flow. When the voltage exceeds a certain limit, the diodes become reverse biased and prevent current flow. This allows the device to act as a voltage-limiting device, preventing the circuit from being damaged by overvoltage or transients.

As the voltage increases, the SP3118-01WTG begins to conduct. When the voltage reaches its peak, the voltage across the device is limited to the breakdown voltage. This limit varies for different models, but is typically around 5V. At this point, the device begins to clamp the voltage, preventing it from exceeding the breakdown voltage and thus protecting the circuit components.

The SP3118-01WTG model is designed to provide many levels of protection, including ESD protection, overvoltage protection, ground fault protection, and more. Its symmetrical construction and robust construction enable it to quickly respond to overvoltage events, limiting the voltage to a safe level and preventing damage to downstream components. The devices also offer protection against reverse breakdown and overvoltage conditions which can occur during the operation of high-speed logic circuits.

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