SA85CAHE3/54 Circuit Protection

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TVS (Transient Voltage Suppression) Diodes represent a specific class of protection components that are used to protect sensitive electronic devices from transient voltage spikes. The SA85CAHE3/54 is an example of a TVS diode that is widely used to protect against a variety of electrical threats. In this article, we will review the application fields and the working principle of the SA85CAHE3/54.

Application Fields

The SA85CAHE3/54 is a unidirectional protection device that is designed to protect against electrical transients such as electromagnetic interference (EMI), induced lightning, and electrostatic discharge (ESD). It can also be used to protect sensitive control circuits from overload currents and voltage fluctuations. This TVS diode is typically used to protect Analog-to-Digital (A/D) converters, Analog Circuit Interconnects (ACIs), microcontrollers, and FPGAs that are subject to transient voltage surges.

The SA85CAHE3/54 can also be used as an EMI filter. By inserting this TVS diode in series with a signal source, it can filter out unwanted noise that could result in errors or malfunctions in the circuit. This TVS diode is also suitable for ESD protection, as it is able to effectively clamp voltages up to the specified ratings.

Working Principle

When a TVS Diode such as the SA85CAHE3/54 is connected between a signal source and a load, it acts as an open circuit until the voltage across the diode exceeds its breakdown voltage. At this point, the diode begins to conduct current, allowing the excess voltage to be diverted away from the signal source and back into the ground. The SA85CAHE3/54 has a breakdown voltage of 35 volts, which means it can handle transient voltage surges up to 35 volts without any damage.

Once the voltage has returned to a safe level, the TVS diode will automatically return to an open circuit state, effectively isolating the signal source from any residual voltage. This ensures that the signal source is shielded from any electrical transients that may have otherwise caused it to malfunction or become damaged.

Conclusion

The SA85CAHE3/54 is a versatile TVS diode that can be used for a variety of protection applications. It is designed to effectively protect sensitive equipment from transient voltage spikes and to filter out unwanted noise. Additionally, it is able to remain open until its breakdown voltage is exceeded and then quickly return to an open-circuit state, ensuring that the signal source is not damaged by any voltage that might remain after the transient surge. In summary, the SA85CAHE3/54 can be used as an effective and reliable protection component in a variety of applications.

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