The S05K420E2 is a varistor manufactured by EPCOS (TDK) designed to protect electronic circuits from transient overvoltage events. This component is a voltage-dependent resistor (VDR) whose resistance decreases dramatically when the voltage exceeds a specific threshold. The 'E2' likely indicates a specific lead configuration or packaging option.

Applications

• Power supplies
• Consumer electronics
• Industrial automation equipment
• Lighting systems
• Surge protection devices

Features

• 5mm disk size
• High surge current capability
• Fast response time
• UL, CSA, and VDE approvals
• RoHS compliant

Benefits

• Protects sensitive electronic components from damage due to voltage surges
• Improves the reliability and extends the lifespan of electronic equipment
• Reduces downtime and maintenance costs associated with surge-related failures
• Provides compliance with relevant safety standards

Additional Details

The S05K420E2 has a maximum continuous operating voltage of 420V AC and 550V DC. The typical varistor voltage at 1 mA is approximately 680V. The maximum surge current withstanding capability depends on the pulse waveform and the number of applied pulses, so consult the datasheet for precise values. The operating temperature range typically spans from -40°C to +85°C. The clamping voltage is an important parameter; it represents the voltage that the varistor will allow to pass through to the protected circuit during a surge event. The 'E2' suffix likely specifies a particular lead type or packaging configuration, influencing mounting and soldering processes. The varistor is crucial in preventing damage to components by diverting excess current during overvoltage events.