A DIAC is a device containing five semiconductors layers (PNPNP) that behaves like two PN PN diodes connected back to back. It can conduct in either direction once the breakover voltage is exceeded. The symbol for DIAC is shown below.
It turns on when the applied voltage in either direction exceeds Vbo.Once it is turned on , a DIAC remains on until its current falls below IH.
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