The S05K440E2 is a varistor produced by EPCOS (TDK), designed to protect electronic circuits against transient voltage surges. As a voltage-dependent resistor (VDR), it exhibits high resistance at normal operating voltages, but its resistance drops dramatically when a surge occurs, diverting the excess current away from sensitive components. The 'E2' designation likely signifies a specific lead configuration or packaging variant.

Applications

• Power supplies (AC/DC and DC/DC)
• Consumer electronics (televisions, audio systems)
• Industrial control equipment
• Lighting systems (LED drivers)
• Telecommunications equipment

Features

• Compact 5mm disk size
• High surge current withstanding capability
• Fast response time to transient events
• UL, CSA, and VDE certifications
• RoHS compliant

Benefits

• Provides reliable protection against overvoltage transients
• Prevents damage to sensitive electronic components
• Enhances the reliability and extends the lifespan of electronic devices
• Reduces equipment downtime and maintenance costs

Additional Details

The S05K440E2 has a maximum continuous operating voltage of 440V AC and 575V DC. The typical varistor voltage at 1mA is approximately 710V. The surge current withstanding capability varies depending on the waveform and number of pulses; refer to the datasheet for specific details. The operating temperature range is generally -40°C to +85°C. Clamping voltage is a key parameter, representing the voltage level that the varistor allows to pass to the protected circuit during a surge. The 'E2' suffix may indicate a specific lead style (e.g., straight or formed) or packaging method (e.g., bulk or tape and reel). Proper selection of the varistor based on the application's voltage requirements is crucial for effective surge protection.