TISP4220M3LM

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The TISP4220M3LM is a 600 Volt avalanche rated thyristor surge protection device (TVS) designed for use in 12V DC Automotive applications. The TISP4220M3LM TVS is designed to protect sensitive loads from high voltage transients and ESD strikes. The avalanche performance and low capacitance make this device ideal for protecting 12V automotive loads including automotive ECUs, power supplies, engine control modules, and beyond.

The device consists of an integrated thyristor, a diode and a zener diode in a standard SOT-223 package. The thyristor works by using a voltage between its cathode and anode to trigger the switch\'s conduction state. When the anode voltage rises above the avalanche voltage of the thyristor, it switches to an ON state in which a relatively large current can pass through the device. The diode allows for bidirectional voltage protection and the zener diode provides a clamping voltage at the anode terminal.

In normal operation, the voltage at the anode is within the normal operating range of the thyristor. When a transient voltage spike occurs, the thyristor avalanche voltage of 600V is exceeded and the thyristor is triggered into the conduction state. This will act as a short circuit, diverting the surge current to the anode and cathode leads of the thyristor. The surge energy is then dissipated in the form of heat, protecting the sensitive load from the transient.

Once the transient voltage has subsided, the thyristor will reset itself and the device will return to its normal, non-conductive state. The diode also acts as a protective element by allowing DC currents to flow from the anode to the cathode but not vice versa. The zener diode helps to clamp the voltage at the anode to a predictable level, reducing the chances of damage to the thyristor.

TISP4220M3LM devices are ideal for protecting automotive ECUs, power supplies, engine control modules, and other automotive components from transients. Its 600V avalanche rating makes it suitable for operating voltages up to 24V and its low capacitance makes it ideal for high speed data signals and fast rise time circuits. The low on-resistance of the thyristor helps to ensure reliable operation at high-current levels while the integrated diode and zener diode clamp the voltage at the anode and provide surge protection in both directions.

Overall, TISP4220M3LM devices provide an excellent surge protection solution for automotive applications. The device combines an integrated thyristor, diode, and zener diode in a compact package that can be easily integrated into automotive designs. The 600V avalanche and low capacitance of the device make it ideal for protecting high speed circuits from voltage transients and ESD strikes.

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