Triac Pin Diagram. From the equivalent circuit diagram shown earlier one might think that main terminals 1 and 2 were interchangeable. Pin 5 is also a second no connection pin of the ic just like pin 3.
From the equivalent circuit diagram shown earlier one might think that main terminals 1 and 2 were interchangeable. When sw1 is closed gate current is applied to the triac from the battery supply v g via resistor r and the triac is driven into full conduction acting like a closed switch and full power is drawn by the lamp from. A1 terminal may be wired in common to the negative vss line or positive vdd line of the gate control supply.
For this to happen the gate pin of the triac should receive a voltage greater than the threshold gate voltage and should also get a current that is greater than gate trigger current.
From the equivalent circuit diagram shown earlier one might think that main terminals 1 and 2 were interchangeable. Figure 15 shows the outline and lists the characteristics of a typical six pin dil version of such a device in which the led has a maximum current rating of 50ma the triac has maximum ratings of 400v and 100ma rms and a surge current rating of 1 2a for 10ms and the entire package has an isolating voltage rating of 1 5kv and a typical input current trigger sensitivity of 5ma. Red stars show packages commonly used for thyristors and triacs. In this circuit the resistor r1 may be 100r or more dependent upon the triac in question.
