CAP003DG

Specialized ICS Overview

The CAP003DG is a specialized IC from the CAPZero™ family designed for automatic X capacitor discharge in AC-DC converters. It blocks current flow through safety discharge resistors during AC voltage application, reducing standby power loss to less than 5 mW at 230 VAC. Upon AC disconnection, it automatically connects internal series resistors to discharge the X capacitor. The device features an 825 V breakdown voltage and supports external capacitance up to 750 nF with a total series resistance of 1.02 MW. Packaged in an 8-SOIC (SO-8) tube, it operates within an ambient temperature range of -10 °C to 105 °C.

Specialized ICS Feature Summary

• Automatic X capacitor discharge with zero standby power loss (<5 mW) when AC is present
• 825 V breakdown voltage rating suitable for surge requirements up to 3 kV with MOV positioned across the X capacitor
• Supports maximum total X capacitance of 750 nF with nominal total series resistance of 1.02 MW
• Self-supplied operation requiring no external bias or ground connection

Specialized ICS Applications

• Appliances requiring EuP Lot 6 compliance
• Adapters requiring ultra-low no-load consumption
• Converters requiring very low standby power

Specialized ICS Procurement Notes

Verify the specific ordering suffix against manufacturer documentation to confirm packaging configuration. Standard configurations are typically supplied in tubes, while tape and reel options may be available with specific suffixes such as TL. Ensure the selected variant matches the required quantity format for production integration.

Specialized ICS Selection Notes

Select the CAP003DG for applications requiring an 825 V rating and X capacitance up to 750 nF. External resistors R1 and R2 must sum to 1.02 MW to meet safety discharge time constants. For systems with differential surges exceeding 1.5 kV or where the MOV is not directly across the X capacitor, consider the 1000 V rated CAP013DG instead.

Specialized ICS Part Context

The CAP003DG belongs to the CAPZero™ family of zero-loss automatic X capacitor discharge ICs manufactured by Power Integrations. This family provides a two-terminal solution that eliminates standby power consumption associated with traditional discharge resistors while maintaining compliance with international safety standards for capacitive discharge times.

Specialized ICS Replacement Considerations

For higher surge immunity or different capacitance values, the CAP013DG offers a 1000 V rating. Lower capacitance requirements may utilize the CAP002DG (≤500 nF), while higher capacitance needs might require the CAP004DG (1 mF). All variants share the same SO-8 package and functional interface.