SMAJ440CA

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TVS diodes are a type of protection device that is used to protect the connected electronic components from damage due to overvoltage spikes or transients. The SMAJ440CA is a unidirectional four-channel TVS diode array specifically designed to protect sensitive electronic equipment from voltage surges and voltage spikes.

The SMAJ440CA has a working voltage rating of 44V, which is suitable for protecting low-voltage circuits. It also has a high peak power dissipation of 4500W, which makes it ideal for high current applications. The SMAJ440CA is designed to absorb a wide range of overvoltage transients with a wide operating temperature range from −40°C to +125°C. The device is available in both DO-214AB (SM) and SOT-23 package types.

The SMAJ440CA is typically used in AC/DC adapter/charger, battery-powered applications, automotive, industrial control systems and other electronic equipment applications. It can be used to protect vulnerable circuits from static discharge, lightning strikes, and other voltage transients.

The SMAJ440CA is constructed of four individual diode chips that are connected in a common cathode configuration. This arrangement reduces the amount of capacitive coupling between the diode channels compared to a single package with multiple diodes in series. This helps to improve diode response time by reducing the interference between the diodes.

When there is an overvoltage transient on the circuit, the first diode in the SMAJ440CA array starts to conduct and dissipates the surge energy. The remaining diodes act as current boosting diodes to protect against higher voltage spikes. Once the surge voltage has dissipated, the current will then be diverted to the internal capacitors of the device, allowing it to return to its normal operating state.

The SMAJ440CA is designed with an internal dynamic thermal shutdown feature that prevents the device from overheating. This feature reduces the risk of additional device damage due to over-temperature operation.

In summary, the SMAJ440CA is an excellent choice for protecting sensitive electronic equipment from voltage surges and voltage spikes. Its wide operating temperature range, high peak power dissipation, and internal dynamic thermal shutdown feature make it an ideal choice for a variety of applications.

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