C1  -  Series DataSheet
C106D1G  -  Sensitive Gate Silicon Controlled Rectifiers SCRs 4 A RMS, 200 ? 600 Volts  -  ON Semiconductor  -  Silicon Controlled Rectifiers

Glassivated PNPN devices designed for high volume consumer applications such as temperature, light, and speed control; process and remote control, and warning systems where reliability of operation is important.
Features
• Glassivated Surface for Reliability and Uniformity
• Power Rated at Economical Prices
• Practical Level Triggering and Holding Characteristics
• Flat, Rugged, Thermopad Construction for Low Thermal Resistance, High Heat Dissipation and Durability
• Sensitive Gate Triggering
• Pb−Free Packages are Available*