Power Integrations CAP009DG-TL

When AC input is present, CAPZero blocks current through the X-capacitor safety-discharge resistors to reduce standby loss. When AC is removed, the device reconnects the resistor path so the X capacitor discharges. The two-terminal function is self-supplied and does not require a separate bias rail or ground connection.

The manufacturer's D package is plastic SO-8, and G denotes a halogen-free, RoHS-compliant material option. TL specifies tape and reel. LCDChip registers 8-SOIC (0.154", 3.90 mm width), consistent with the manufacturer's 3.90-mm body drawing.

Layout checks

• Use the controlled SO-8 land pattern and pin-one marker.
• Preserve specified creepage and clearance across the package.
• Check resistor placement and mains-safety spacing in the complete PCB.

This generic JPG does not show CAPZero pin connections.

The data sheet identifies D1 on pins 2 and 3 and D2 on pins 6 and 7; pins 1, 4, 5 and 8 are NC in the package diagram. The manufacturer recommends grouping pins 1-4 and pins 5-8 on the PCB to support the specified creepage arrangement. Follow the controlled application layout rather than treating the generic package JPG as a pin diagram.

For CAP009, the table footnote identifies 150 kilohms as the lowest usable resistor value. Use the complete data sheet for tolerances, surge limits and compliance testing.

Another CAPZero order code may differ in breakdown grade, supported X capacitance or nominal resistor value. A CAP019 1000-V option, for example, is not a drop-in approval without reviewing MOV location, surge conditions and the discharge network. Validate the end-product safety test and packaging requirement. No unverified internal alternative link is asserted.

Power Integrations documents CAP009DG in the CAPZero Family data sheet, revision H. Its component-selection table specifies the CAP009 electrical selection, and the part-ordering section defines D, G and TL. The manufacturer also provides application considerations for MOV placement, surge measurement and X-capacitor discharge.

Verify the complete CAP009DG-TL order code, reel and lot labels, package marking and traceability. Incoming and end-product tests should confirm the expected circuit behavior, surge withstand and discharge time; exterior marking alone cannot establish mains-safety compliance.

This device connects to a mains-related safety circuit. Use the current Power Integrations data sheet, package drawing and applicable safety standards for schematic, PCB creepage, fuse/MOV placement, fault analysis, surge testing and discharge-time verification. Only qualified engineers should approve the final implementation.