SMC30J5.0CA

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Transient Voltage Suppressors (TVS) are an important feature of modern safety electrical systems, protecting them from damage caused by transient overvoltages. The SMC30J5.0CA is an example of a TVS device, specifically designed to protect small equipment from electrical transients. The device has a breakdown voltage of 30V and a peak pulse current rating of 5.0A.

The SMC30J5.0CA is most commonly used for three purposes:

• Surge suppression: protects components from electrical transients caused by lightning, power supply fluctuations, and electrostatic discharge.
• High voltage protection: prevents overvoltages from damaging equipment.
• Transformer isolation: isolates transformer primary and secondary sides.

Working Principle

The SMC30J5.0CA contains a zener diode that clamps the voltage across itself by conducting when the voltage exceeds the rated breakdown voltage. This process acts like a mini-circuit breaker and protects sensitive components by limiting the voltage and current that can flow through them. The device is designed as a “one-shot” device that will open (short circuit) when it is triggered and fail in the open circuit state. The device is non-reversible, which means the voltage must be reduced to the original value before the device will reset itself.

The SMC30J5.0CA is typically used in parallel with the component that needs protecting, and the device is a unidirectional device. This means it only protects against electrical transients from one direction. The device can be used in both AC and DC circuits, and is rated for up to 5.0A peak pulse current.

Package Options

The SMC30J5.0CA is available in a variety of package sizes to fit a range of application needs. For high-density applications, the SOT-23 and DFN packages are suitable, while more robust applications often require the larger SMA or DO-214 packages. The device also offers a variety of termination options such as lead free, tin-plated, and gold-plated for increased reliability.

Conclusion

The SMC30J5.0CA is an example of a TVS device designed to protect small equipment from transients. The device has a breakdown voltage of 30V and a peak pulse current rating of 5.0A. It is most commonly used for surge suppression, high voltage protection, and transformer isolation, and is available in a variety of package sizes with a choice of termination options. This makes it an ideal choice for applications requiring small, high-performance transient protection.

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