Q4015L559

Triacs Overview

The Littelfuse Q4015L559 is a Quadrac device belonging to the QxxxxLTx series, manufactured by Teccor. It integrates a triac and a diac trigger within a single package to facilitate AC switching and phase control. The component features an on-state current (Itrms) of 4A and supports voltage ratings up to 600V. It utilizes a TO-220 package with electrical isolation of 2500V rms from leads to the mounting surface. Key parameters include a breakover voltage range defined by VBO MIN and VBO MAX, and a maximum repetitive peak off-state voltage (VDRM). The device employs glass-passivated junctions for reliability.

Triacs Feature Summary

• Integrates a gated triac and a diac trigger in one package to eliminate discrete assembly
• Bidirectional AC switch controlled by gate polarity for main terminal voltage
• Electrically isolated TO-220 package removes need for external insulators
• Glass-passivated junctions ensure parameter stability and long-term reliability

Triacs Applications

• AC speed controls
• Temperature modulation controls
• Lighting controls requiring noise immunity

Triacs Procurement Notes

Verify the specific suffix against official Littelfuse documentation to confirm exact breakover voltage and current ratings. Ensure the TO-220 package isolation requirements match the application's safety standards. Confirm RoHS compliance status through the manufacturer's current product declaration. Cross-reference the part number with authorized distributors to validate authenticity and supply chain integrity before procurement.

Triacs Selection Notes

Select this component for applications requiring integrated triac-diac functionality without separate snubber networks if using the LTH variant. Evaluate the 4A RMS current capacity against peak load requirements. Consider the 2500V rms isolation capability for high-voltage interfaces. Verify that the operating temperature range and thermal management solutions align with the system's environmental constraints.

Triacs Part Context

This component is part of the Teccor brand Quadrac family under Littelfuse Inc. These devices are engineered to simplify circuit design by combining two components into one. The QxxxxLTx series specifically targets AC phase control applications. The integration reduces assembly time and cost compared to discrete diac-triac combinations. The technology relies on established semiconductor manufacturing processes for consistent performance.

Triacs Replacement Considerations

No public confirmed substitute part numbers are available in the provided data. Consult Littelfuse engineering for direct replacements or pin-compatible alternatives. Verify functional equivalence regarding breakover voltage and on-state current when considering third-party options.

Triacs FAQ

What is the primary advantage of using the Q4015L559 over discrete components?

It eliminates the expense and assembly time of buying and assembling a discrete diac with a gated triac.

Does the Q4015L559 require an external snubber network?

Standard QxxxxLTx devices may require snubbers; however, the alternistor Quadrac device (QxxxxLTH) specifically eliminates the need for a snubber network.

What is the isolation rating of the TO-220 package?

The package is electrically isolated to 2500V rms from the leads to the mounting surface.