CD214L-T18ALF

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TVS - Diodes are an important class of electronic devices which have essential applications in the automotive industry and other areas where reliable and efficient data protection is required. Their primary role is to provide protection against transient voltage surges which, if they occur, can damage sensitive electronic equipment. In this article, the CD214L-T18ALF application field and working principle will be discussed.

CD214L-T18ALF is a dual-channel unidirectional overvoltage protection (MOV) TVS diode made by Ironwood Electronics. It is widely used in automotive applications, such as, AC/DC converter protection, automotive electronic control unit (ECU) protection, automotive electronics such as, tire pressure correction systems, and particular automotive lighting system protection. CD214L-T18ALF has a maximum peak power rating of 600 W. It operates at a nominal breakdown voltage of 18.0 V and can handle repetitive peaks of up to 24.0 V. It clamps transient PULSE currents up to 70A (tP=10/1000s; tP=pulse width).

The different working principle of CD214L-T18ALF is based on the familiar avalanche breakdown mechanism of a p-stop junction. The overvoltage protection of TVS diodes is generally complex and highly dependent on temperature, test pulses, leakage current and pre-charge voltage, among others. Whenever an ultrashort voltage spike occurs at the input of the circuit, the CD214L-T18ALF quickly switches from a high-resistance state to a low-resistance state. This is because the voltage spike causes the p-stop junction to breakdown, thus allowing the diode to conduct current away from the circuit. Once the voltage spike dissipates, the diode quickly switches back to its high-resistance state, clamping the overvoltage and protecting against damage.

The key feature of CD214L-T18ALF is its thermal protection circuit, which avoids any possible masking effect during sequential surges. If an extravagant current flow occurs, a built-in Polaron activation circuit causes the thermal junction to activate. This allows semi-conductive layers to become conductive, causing the resistance to increase exponentially. The circuit quickly returns to stable condition, allowing it to continue without further interruption.

The relative stability of CD214L-T18ALF is remarkable. It provides excellent protection against high-energy ESD events (electrostatic discharge) and lightning. This makes it the ideal choice for application in automotive, industrial and other harsh environment. By suppressing the negative peak of an ESD transient, it allows uninterrupted passage of a low-energy signal.

For power saving and efficiency purposes, the CD214L-T18ALF has its own LED indicator to show if a Voltage surge is present or not. This helps to prevent damage to devices connected to the circuited, but also helps protect the TVS diode itself. Moreover, the LED indicator helps to minimize losses from the input power.

The CD214L-T18ALF is a versatile and reliable solution for reliable and cost-effective protection of sensitive electronic equipment. Its avalanche breakdown operation, thermal protection circuit and LED indicator make it an ideal choice for applications in harsh automotive and industrial environments.

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