Thyristor (SCR) pin discrimination (1) Polarity identification: ① range multimeter or appropriated R × 10 × 100 stalls ② anode - cathode forward resistance in more than a few hundred K Ω SCR BTA412Y, reverse resistance to ∞. ③ anode - forward resistance between the gate more than a few hundred K Ω. ④ gate - cathode resistor between positive about SCR BTA216 within tens Ω range, generally reverse resistance than the forward resistance, resistance in the range of several hundred Ω. Triac structure principle and application of construction principles although can be seen as a combination of two ordinary triac thyristor from the form, but in fact it is more than just seven transistors and resistors power integrated devices. Low power TRIAC SCR generally use plastic package BTA212, some also with a heat plate, l shape as shown in Figure. Typical products BCMlAM (1A / 600V), BCM3AM (3A / 600V), 2N6075 (4A / 600V), MAC218-10 (8A / 800V) and so on. Triac power they use RD91 package. SCR BTA204 | are fertile Electronics (certified) | SCR Dongguan City is provided by Wal-Electronic Technology Co., Ltd. Dongguan City is Wal-Electronic Technology Co., Ltd. (www.dgmydz.com) (www.dgmydz.com) is Dongguan, FET leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, the maximum limits to meet customer needs. Wal-electronics leader in the positive with the staff warmly welcome all inquiries negotiations to create a positive future Wal-electron better.