QAS104K122D039

Overview

The QAS104K122D039 is a radial leaded RC snubber network capacitor manufactured by Cornell Dubilier Knowles. It integrates a 0.1 µF polyester film dielectric capacitor with a 39 Ohm internal resistor in a single package. The component features a DC voltage rating of 1600 V and an AC voltage rating of 660 V. Physical dimensions are approximately 40.6 mm in length, 16.3 mm in width, and 25.4 mm in height, with a terminal pitch of 45.7 mm. It operates within a temperature range of -55°C to +85°C.

Feature Summary

• Integrates a 0.1 µF capacitor and 39 Ohm resistor into a single radial component for space-efficient circuit design.
• Utilizes high-grade polyester film dielectric to ensure stable performance under high voltage conditions.
• Designed specifically as a first-order RC snubber network to suppress voltage transients and dampen oscillations.

Applications

• Snubber circuits for power electronic switches such as IGBTs and MOSFETs
• EMI/RFI suppression networks in industrial power supplies
• Transient voltage protection in motor drive systems

Procurement Notes

Verify the specific voltage rating required for your application, as similar part numbers in this series may have different DC ratings (e.g., 1200V vs 1600V). Confirm that the integrated resistance value of 39 Ohms matches your snubber design calculations. Ensure the radial lead spacing of 45.7 mm fits your PCB layout constraints before ordering.

Selection Notes

Select this component when a compact, pre-tuned RC snubber solution is needed for high-voltage switching applications. The integrated design eliminates the need for separate discrete components, reducing assembly time and potential connection failures. Consider the thermal dissipation capabilities of the 39 Ohm resistor if high-frequency switching losses are expected in the target circuit.

Part Context

This component belongs to the QAS series of snubber capacitors from Cornell Dubilier Knowles. The series is engineered for robust performance in demanding environments, combining film capacitor reliability with precise resistive damping. These parts are commonly used in industrial and military-grade electronics where long-term stability and high voltage withstand capability are critical requirements.

Replacement Considerations

Direct substitutes must match the 0.1 µF capacitance, 39 Ohm resistance, and radial form factor. Verify that any alternative part supports at least 1600 VDC and 660 VAC ratings. Check physical dimensions and lead pitch compatibility to ensure mechanical fit without modification.

FAQ

What is the internal resistance value of the QAS104K122D039?

The internal resistance is 39 Ohms, which is integrated directly with the 0.1 µF capacitor.

What is the maximum operating temperature for this component?

The maximum operating temperature is +85°C, with a minimum operating temperature of -55°C.