QJ4008DH3RP

Triacs Overview

The Littelfuse QJ4008DH3RP is an Alternistor triac from the QJxx08xH series, designed for AC switching and phase control. It features a rated repetitive off-state voltage (VDRM) of 400 V and an on-state RMS current (It RMS) of 8 A. The device operates within a temperature range of -40 °C to +150 °C and utilizes a TO-252-3 surface-mount package. Key electrical parameters include a maximum on-state voltage of 1.5 V, gate trigger voltage (Vgt) of 1.3 V, and gate trigger current (Igt) of 10 mA. Off-state leakage current is specified at 10 uA under VDRM conditions.

Triacs Feature Summary

• Sensitive gate type ensuring reliable control in Quadrants I & IV for digital circuitry compatibility
• High commutation capability suitable for demanding AC switching environments
• High-temperature operation up to +150 °C for robust thermal performance

Triacs Applications

• Motor speed modulation controls
• Temperature modulation controls
• Lighting controls
• Static switching relays

Triacs Procurement Notes

Verify the specific suffix 'RP' against official Littelfuse documentation to confirm packaging configuration, as it may indicate reel or cut tape availability distinct from other variants like 'TP'. Confirm RoHS compliance status via the manufacturer's datasheet before integration. Ensure the 400V rating aligns with the target circuit requirements rather than assuming higher voltage capabilities common in the broader series.

Triacs Selection Notes

Select this component when sensitive gate drive is required for digital control interfaces operating in Quadrants I and IV. The 8 A RMS rating and 400 V blocking voltage define the power handling limits. Compare against the QJ4008DH3TP if tube packaging is preferred over the RP configuration. Verify that the TO-252-3 footprint matches the PCB layout constraints for surface-mount assembly.

Triacs Part Context

This part belongs to the QJxx08xH series of high-temperature Alternistor triacs by Littelfuse. These devices are engineered specifically for applications requiring high commutation rates and sensitive gate triggering. The series shares core electrical characteristics but varies in packaging and voltage ratings across different model numbers.

Triacs Replacement Considerations

QJ4008DH3TP is a verified substitute within the same series offering identical electrical specifications but utilizing tube packaging instead of the RP configuration.