LX803DTRP

Triacs Overview

The Littelfuse LX803DTRP is a sensitive gate triac belonging to the LX8 series, designed for AC switching applications. It features an RMS on-state current of 800 mA and a rated repetitive peak off-state voltage of 400 V. The device operates within a junction temperature range of -40°C to +110°C and utilizes a SOT-223 (TO-261AA) surface-mount package. Key electrical parameters include a maximum holding current of 5 mA, a gate trigger voltage of 1.3 V, and gate trigger currents ranging from 3 mA to 5 mA. It exhibits a non-repetitive peak on-state current capability of 8 A and maintains a low on-state voltage of 1.6 V with a leakage current of 5 µA at maximum voltage.

Triacs Feature Summary

• Sensitive gate architecture enabling reliable triggering with low gate drive requirements
• Surface-mount construction in a compact SOT-223 package for automated assembly
• Glass-passivated junctions ensuring long-term parameter stability and reliability

Triacs Applications

• AC phase control circuits
• Lighting dimmer controls
• Temperature modulation systems

Triacs Procurement Notes

Verify the specific ordering suffix DTRP to confirm the SOT-223 surface-mount package and tape-and-reel packaging configuration. Ensure compatibility with standard surface-mount reflow soldering profiles. Confirm that the 400V voltage rating meets the circuit's peak inverse voltage requirements. Validate that the 800mA RMS current capacity is sufficient for the intended load. Check for RoHS compliance documentation if required by the manufacturing facility.

Triacs Selection Notes

Select this component when a small form-factor triac is required for low-power AC switching. The sensitive gate characteristic simplifies driver circuit design compared to standard gate devices. Consider the thermal management capabilities of the PCB copper area, as the TO-261AA package relies on board heat sinking. Compare the 800mA current rating against peak load demands to ensure adequate derating margins under high ambient temperatures.

Triacs Part Context

This part belongs to the Littelfuse LX8 family of thyristors, which are engineered for general-purpose AC control. The LX8 series offers various voltage and current ratings across through-hole and surface-mount packages. The LX803DTRP specifically addresses the need for compact, surface-mount solutions in consumer electronics and appliance control boards where space constraints are critical.

Triacs Replacement Considerations

Cross-reference with other LX8 series variants such as LX807DTRP for similar current ratings but different gate trigger characteristics. Verify pinout compatibility before substituting with generic SOT-223 triacs. Ensure replacement parts maintain the same 400V blocking voltage and sensitive gate sensitivity.