SMDJ20CAHM6G

TVS - Diodes

SMDJ20CAHM6G is a transient voltage suppressor which is used to prevent damage from voltage surges in electrical circuits. It is designed with a Zener diode to break down at the specified reference voltage which then shorts out the excessive voltage. It is an important component in many applications such as AC/DC connectors, touch panels, computers, automotive infotainment systems and more. This product also complies with the standard of MSL 2a.

Application

SMDJ20CAHM6G has an operating voltage range from 10 volts up to 260 volts. Its low capacitance, low leakage current, and maximum power dissipation make it ideal for applications where protecting sensitive electronic components from voltage surges is a priority. Examples of such applications include:

• Computer, laptop, and notebook chargers
• Telecommunications equipment
• Power adapters
• Touch panels
• AC/DC connectors
• Automotive infotainment systems
• Electronics consumer products

Working Principle

Basically, when the circuit abnormal voltage is higher than the rating voltage of the device, the SMDJ20CAHM6G will quickly clamp the voltage at its rated voltage and discharge the excessive voltage out of the port. In this way, it helps to safe guard the normal operation of the circuit devices and protect them from possible damage.

The breakdown voltage of SMDJ20CAHM6G is determined by the silicon chip of a Zener diode. At the same time, these chips are surrounded by a PN junction which is used to stabilise the breakdown voltage. Additionally, a special material is also applied on the chips which helps to accelerate the arc discharge.

When the surge voltage reaches a certain critical voltage, it will cause a massive current which is known as the arc current. This arc current has two phenomena that consist of a short pulse and a spike. Under normal circumstances, the voltage will disappear within few nanoseconds due to the protection short of the circuit. Therefore, the SMDJ20CAHM6G will suppress the voltage surge efficiently to ensure its perfect protection.

Conclusion

The SMDJ20CAHM6G is an effective and reliable transient voltage suppressor which can be used in many applications. Its Zener diode-based chip and PN junction helps to provide a stable breakdown voltage and the special material applied on the chips helps to accelerate the arc discharge. Such features make this product perfect for protecting sensitive electronic components from voltage surges.