Q4025J681

Triacs Overview

The Littelfuse Q4025J681 is an Alternistor TRIAC designed for AC power control applications. It features a rated repetitive off-state voltage (VDRM) of 400 V and an on-state RMS current (ITRMS) of 25 A. The device utilizes a TO-218AC package with three pins for through-hole mounting. Key electrical parameters include a maximum gate trigger current (IGT) of 80 mA, a maximum holding current (IH) of 100 mA, and a peak on-state voltage of 1.8 V. It operates within a junction temperature range from -40 °C to +125 °C.

Triacs Feature Summary

• Alternistor technology eliminates the need for external snubber networks in many applications.
• Integrated diac structure simplifies circuit design by removing discrete trigger components.
• High noise immunity suitable for demanding AC switching environments.

Triacs Applications

• Lighting controls
• Temperature modulation controls
• Speed controls

Triacs Procurement Notes

Verify the specific suffix J681 against official Littelfuse documentation to confirm exact gate characteristics and package variations. Ensure compatibility with existing thermal management designs given the 25 A rating. Confirm RoHS compliance status via the manufacturer's latest datasheet before finalizing procurement specifications.

Triacs Selection Notes

Select this component when high noise immunity and simplified triggering are required without external snubbers. Compare gate sensitivity requirements against the 80 mA IGT specification. Evaluate thermal dissipation needs for the TO-218AC package under continuous 25 A load conditions relative to ambient operating temperatures.

Triacs Part Context

This part belongs to the Qxx25xx series of Alternistor TRIACs manufactured by Littelfuse. These devices integrate a diac trigger within the same package as the triac, offering a compact solution for AC phase control. The series is characterized by glass-passivated junctions for parameter stability and reliability.

Triacs Replacement Considerations

Cross-reference with Teccor Electronics Q4025K681 for potential functional equivalence. Verify pinout compatibility and exact gate trigger thresholds before substitution. Consult Littelfuse application notes for approved alternative part numbers within the same family.