CQ202-4DS

Triacs Overview

The CQ202-4DS is a 4.0 A silicon triac from the Central Semiconductor CQ202 series, rated for 400 V peak repetitive off-state voltage (VDRM). Packaged in a TO-202 case, it supports full-wave AC control with gate triggering across all four quadrants. Key electrical parameters include a maximum RMS on-state current of 4.0 A at TC=80°C, a surge current capability of 35 A for 10 ms pulses, and an I²t value of 6.0 A²s. The device operates within a junction temperature range of -40°C to +125°C, featuring a thermal resistance (ΘJC) of 7.5°C/W and a typical gate trigger current (IGT) of 5.0 mA.

Triacs Feature Summary

• Four-quadrant gate triggering capability for reliable AC switching
• Epoxy molded construction designed for general-purpose full-wave applications
• High surge current handling with defined I²t fusing values

Triacs Applications

• Full-wave AC control circuits
• General purpose mains power switching
• Phase angle control applications

Triacs Procurement Notes

This component has been officially classified as End of Life (EOL) by Central Semiconductor Corp. Last purchase orders must be placed within six months of the notice date, with final shipments occurring within twelve months. No direct replacement part number is currently available from the manufacturer. Buyers should verify stock availability through authorized distributors or consider alternative sources immediately due to the discontinuation status.

Triacs Selection Notes

Select this device only if the specific 400 V rating and TO-202 package form factor are required for legacy designs. Verify that the 4.0 A RMS current capacity meets the load requirements. Since the part is discontinued, ensure that any substitute component matches the pinout configuration (MT1, MT2, Gate) and thermal characteristics to maintain circuit integrity without redesign.

Triacs Part Context

The CQ202-4DS belongs to the broader CQ202 series of 4.0 A triacs manufactured by Central Semiconductor Corp. This family includes variants with different voltage ratings, such as the CQ202-4BS (200 V), CQ202-4MS (600 V), and CQ202-4NS (800 V). All members share the same physical TO-202 package and general electrical characteristics, differing primarily in their peak repetitive off-state voltage capabilities.

Triacs Replacement Considerations

No official replacement part number is listed by Central Semiconductor Corp. for the CQ202-4DS. Engineers must source third-party equivalents that match the 4 A current, 400 V voltage, and TO-202 package constraints.