CPDF5V0U-HF

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TVS - Diodes

TVS diodes (Transient Voltage Suppressor diodes) are a key component of protection against electrical transients and surge currents. These diodes are designed to protect consumer electronics, power management circuits, and other devices from damaging voltage spikes and currents. This article will discuss the application field and working principle of CPDF5V0U-HF.

Application Field

The CPDF5V0U-HF from Littelfuse is a unidirectional, surface mount TVS diode. This diode is designed to protect microprocessor-based components from voltage transients caused by lightning, static discharge, load switching, and other overvoltage events. It is suitable for use in computers, industrial circuit boards, communications systems, and consumer electronics. The CPDF5V0U-HF can support peak pulse power of up to 500W and clamping voltage of up to 5V.

Working Principle

A TVS diode operates by diverting excess current away from the protected components and routing that current to ground. This is achieved by its unidirectional nature; using a semiconductor p-n junction, the diode allows current to flow only in one direction, away from the protected components and to ground. This effectively "clamps" the voltage to a certain level, so that no significant voltage overshoot occurs.

When an overvoltage event occurs, the diode begins to conduct current by utilizing the reverse-biased p-n junction. As current increases, the voltage across the diode\'s junction drops until it reaches the diode\'s breakdown voltage. Once the diode breakdown voltage is reached, the diode conducts current until the voltage is reduced to a safe operating level.

When the overvoltage event passes, the diode begins to conduct less current, allowing the voltage across the diode to increase. As current continues to decrease, the diode eventually reaches its breakdown voltage again, and the process is repeated until the diode has cooled down enough for normal operation. In this manner, the diode can protect electronics against damaging surges and spikes in voltage.

Conclusion

In conclusion, the CPDF5V0U-HF from Littelfuse is a unidirectional, surface mount TVS diode that is designed to protect microprocessor-based components from voltage transients. The CPDF5V0U-HF can support peak pulse power of up to 500W and clamping voltage of up to 5V. The diode utilizes a reverse-biased p-n junction to conduct current away from the protected components and to ground when an overvoltage event occurs, thus protecting against damaging surges and spikes in voltage.

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