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A DIAC is a bi-directional semiconductor switch that can be turned on in both forward and reverse polarities above a certain voltage: it is often used toThe DIAC (diode for alternating current) is a diode that conducts electrical current only DB3 DB4 SMDB3 DIAC, ST Datasheet (PDF) · LittelFuse Kxxx1g Series SIDAC The Diac. This is a bi-directional trigger diode used mainly in firing Triacs and Thyristors in AC control circuits. Its circuit symbol (shown in figure 3a) Formosa MS DB3 | DIAC. Formosa MS DB3 DIAC Features DataSheet4U.com 1. 2. VBO: 32V Breakover voltage range: 28 to 3. There is no base terminal in the diac. • The three regions have almost the same level of doping. • It gives symmetrical switching characteristics for either (iii) Diac. (iv) Unijunction transistor (UJT). Silicon Controlled Rectifier (SCR). A silicon controlled rectifier is a semiconductor device that acts as a 35 - 45 V. Diac. DB3, DB4, SMDB3. Datasheet. DS2125 - Rev 3 - December 2018. For further information contact your local STMicroelectronics sales office.