ERZ-CF2MK391

The ERZ-CF2MK391 is a varistor, also known as a voltage-dependent resistor (VDR), that is used for transient overvoltage and overcurrent suppression. It is manufactured by NXP Semiconductor. The ERZ-CF2MK391 is a thermally protected surface mount varistor designed for direct mounting on Printed Circuit Boards (PCBs). This varistor can dissipate high peak pulse currents and provide ESD protection. It is used in a variety of applications such as uninterruptible power supplies (UPSs), power inverters, DC/DC converters, and switched mode power supplies (SMPS).

The ERZ-CF2MK391 provides extremely low leakage current making it ideal for sensitive electronic circuits that require ESD protection. This varistor can also withstand high pulse currents up to 5.0kA. In addition, it has a small footprint and a low profile making it ideal for applications where space is limited. The varistor is RoHS compliant and UL approved making it suitable for a variety of applications.

A varistor is a passive two-terminal solid-state semiconductor device that behaves like a variable resistor. It changes its electrical resistance when exposed to changing voltages. The ERZ-CF2MK391 has a peak pulse current rating of 5.0kA and a rated voltage of 175V. When the voltage across the varistor exceeds the rated voltage, it will conduct and dissipate the excess current which will reduce the voltage across the device. This protects the device from overvoltage.

The ERZ-CF2MK391 has a wide range of applications. It can be used in a variety of automotive, industrial, and consumer equipment. It can also be used in medical devices, communications equipment, motor control applications, power supplies, lighting systems, and other equipment that requires surge protection. This varistor is also suitable for use in portable and battery-powered devices that require ESD protection.

The working principle of the ERZ-CF2MK391 is based on its voltage dependent resistor. When the voltage across the varistor exceeds the rated voltage, the device will conduct and dissipate the excess current which will reduce the voltage across the device. This varistor can also be used in AC circuits as a transient suppressor. In this application, the device will divert any transient currents to ground, thereby protecting the circuit from any harmful overvoltage.

In summary, the ERZ-CF2MK391 is a surface mount varistor designed for direct mounting on PCBs. It is an ideal choice for applications that require ESD protection and pulse current overvoltage and overcurrent protection. It has a peak pulse current rating of 5.0kA and a rated voltage of 175V. The ERZ-CF2MK391 has a wide range of applications in a variety of automotive, industrial, and consumer applications.