双向可控硅(TRIAC, TRI-ELECTRODE AC SWITCH)为三极交流开关，亦称为双向晶闸管或双向可控硅。 TRIAC为三端元件，其三端分别为T1 (第二端子或第二阳极)，T 2(第一端子或第一阳极)和G(控制极)亦为一闸极控制开关，与SCR最大的不同点在于TRIAC无论于正向或反向电压时皆可导通。
| 型号 | 品牌 | IT(RMS)_Max /A | ITSM_Max @ f = 50Hz/A | VDRM_Min/V | IGT_I_Max/mA | IGT_II_Max/mA | IGT_III_Max/mA | TJ_Max /°C | 封装 |
|---|---|---|---|---|---|---|---|---|---|
| JST138K-800E | JJM | 12 | 95 | 800 | 10 | 10 | 10 | 125 | TO-252 |
| JST138K-800F | JJM | 12 | 95 | 800 | 25 | 25 | 25 | 125 | TO-252 |
| JST139A-600D | JJM | 16 | 140 | 600 | 5 | 5 | 5 | 125 | TO-220A |
| JST139A-600E | JJM | 16 | 140 | 600 | 10 | 10 | 10 | 125 | TO-220A |
| JST139A-600F | JJM | 16 | 140 | 600 | 25 | 25 | 25 | 125 | TO-220A |
| JST139A-800D | JJM | 16 | 140 | 800 | 5 | 5 | 5 | 125 | TO-220A |
| JST139A-800E | JJM | 16 | 140 | 800 | 10 | 10 | 10 | 125 | TO-220A |
| JST139A-800F | JJM | 16 | 140 | 800 | 25 | 25 | 25 | 125 | TO-220A |
| JST139C-600D | JJM | 16 | 140 | 600 | 5 | 5 | 5 | 125 | TO-220C |
| JST139C-600E | JJM | 16 | 140 | 600 | 10 | 10 | 10 | 125 | TO-220C |
| JST139C-600F | JJM | 16 | 140 | 600 | 25 | 25 | 25 | 125 | TO-220C |
| JST139C-800D | JJM | 16 | 140 | 800 | 5 | 5 | 5 | 125 | TO-220C |
| JST139C-800E | JJM | 16 | 140 | 800 | 10 | 10 | 10 | 125 | TO-220C |
| JST139C-800F | JJM | 16 | 140 | 800 | 25 | 25 | 25 | 125 | TO-220C |
| JST139D-600D | JJM | 16 | 140 | 600 | 5 | 5 | 5 | 125 | TO-262 |
| JST139D-600E | JJM | 16 | 140 | 600 | 10 | 10 | 10 | 125 | TO-262 |
| JST139D-600F | JJM | 16 | 140 | 600 | 25 | 25 | 25 | 125 | TO-262 |
| JST139D-800D | JJM | 16 | 140 | 800 | 5 | 5 | 5 | 125 | TO-262 |
| JST139D-800E | JJM | 16 | 140 | 800 | 10 | 10 | 10 | 125 | TO-262 |
| JST139D-800F | JJM | 16 | 140 | 800 | 25 | 25 | 25 | 125 | TO-262 |