Triac schematics - Structural diagram triac belong NPNPN five devices, three electrodes are T1, T2, G. Although the form can be seen as two ordinary triac thyristor combinations, but in fact it is more than just seven transistors and resistors power integrated devices. Because the device can double conduction, so the two gate electrodes in addition to the main terminal G collectively, with T1, T2. Said that no longer divided into the anode or cathode. It features SCR BTA412Y, when G pole pole and T2 relative to T1, the voltages are positive, T2 is the anode, T1 is the cathode. On the contrary, when the G electrode with respect to the pole and T2 are negative when the voltage of T1, T1 becomes the anode, T2 is a cathode. Since the triac, the reverse characteristic curve has symmetry, so that it can be turned in either direction. Compared to the way SCR SCR BTA140, triac biggest difference is that we can double conduction in principle, no anode-cathode points, replaced with T1 and T2 SCR BTA216, its structure diagram the following figure 2 (a) shows, if you do not consider the different G-rated, it is divided into Figure 2 (b) shows, we can see that the equivalent of two-way thyristor triac made antiparallel Schematic - A method of detecting extremely determination T2 be seen from Figure 6, G very very close to the T1, T2 very far away. Therefore, positive and negative resistance between G-T1 is very small. RXl file with resistance measured between any two feet, only between the G-T1 exhibits low resistance, positive and negative resistance is only a few dozen in Europe, and T2-G, are between T2-T1, reverse Resistors are infinite. This suggests that, if measured in a foot and other feet do not pass, it certainly is extremely T2. In addition, the use of TO-220 package SCR Triac, T2 is usually very little communication with the cooling plate, thus also determine the T2 pole. 2. After distinguishing T1 G pole and pole (1) identify the T2 pole, first assume that the rest of the feet in a foot of Tl pole, the other foot for G pole. (2) the black pen then T1 pole, the red pen then T2 pole, resistance is infinite. Followed by the red pen to T2 and G short for G-pole with a negative trigger signal, the resistance value should be around ten Euro (see Figure 6 (a)), the tube has proved conduction, conduction direction T1 a T2. Then the red pen and G pole disengaged (but still connected to T2), if the resistance value remains unchanged, prove tubes can be maintained after the trigger conduction state (see Figure 6 (b)). SCR SCR _ BTA204_ are fertile Electronics Dongguan City is provided by Wal-Electronic Technology Co., Ltd .. Dongguan City is Wal-Electronic Technology Co., Ltd. (www.dgmydz.com) (www.dgmydz.com) strong, credible, FET and other industries in Dongguan, Guangdong has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the electronics are fertile and you hand into the brilliant, for a better future! You can also access (www.dgmydz.com/supply_details_39359630.html), for more information about the company.