The S20K250E3K1 is a varistor from EPCOS (TDK) belonging to the S20 series, specifically designed to protect electronic devices and circuits from overvoltage transients. It provides a reliable and effective means of diverting excess voltage caused by events like lightning strikes, inductive switching, and electrostatic discharge (ESD), ensuring the safe and continued operation of sensitive electronic components.

Applications

• Power supplies
• Industrial control equipment
• Surge protection devices (SPDs)
• Consumer electronics
• Telecommunication systems

Features

• High surge current capability
• Fast response time to transient events
• Compliance with UL, CSA, VDE, and IEC safety standards
• Wide operating voltage range
• RoHS compliant
• Lead-free terminations

Benefits

• Provides robust overvoltage protection
• Protects sensitive electronic components from damage
• Improves product reliability and extends lifespan
• Meets industry safety and environmental regulations
• Easy to integrate into circuit designs
• Cost-effective surge protection solution

Additional Details

The S20K250E3K1 varistor has a varistor voltage of 250V. This means that the varistor will start conducting and clamping the voltage when the voltage across it exceeds 250V. The 'S20' designation indicates a disk size of 20mm, providing a good balance between surge handling capability and size. The 'E3K1' suffix specifies the lead configuration and packaging. Design engineers should always consult the device datasheet for detailed specifications. Key parameters to consider include the maximum surge current rating (typically specified for an 8/20 µs pulse), clamping voltage characteristics, energy absorption capabilities, and the operating temperature range. These parameters are critical for proper varistor selection in a given application. The device is designed for through-hole mounting. The ambient operating temperature should be carefully considered, as it affects the varistor's performance and lifespan. Over time and repeated surges, the varistor's characteristics can change, so regular testing may be necessary in critical applications. The varistor essentially acts as a voltage-dependent resistor, quickly diverting excess current when the voltage exceeds its threshold.