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 | 制造商 | 封装 | 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 |
|---|---|---|---|---|---|---|---|---|---|
| JST138E-800D | JJM | TO-263 | 12 | 95 | 800 | 5 | 5 | 5 | 125 |
| JST138E-800E | JJM | TO-263 | 12 | 95 | 800 | 10 | 10 | 10 | 125 |
| JST138E-800F | JJM | TO-263 | 12 | 95 | 800 | 25 | 25 | 25 | 125 |
| JST138F-600D | JJM | TO-220F | 12 | 95 | 600 | 5 | 5 | 5 | 125 |
| JST138F-600E | JJM | TO-220F | 12 | 95 | 600 | 10 | 10 | 10 | 125 |
| JST138F-600F | JJM | TO-220F | 12 | 95 | 600 | 25 | 25 | 25 | 125 |
| JST138F-800D | JJM | TO-220F | 12 | 95 | 800 | 5 | 5 | 5 | 125 |
| JST138F-800E | JJM | TO-220F | 12 | 95 | 800 | 10 | 10 | 10 | 125 |
| JST138F-800F | JJM | TO-220F | 12 | 95 | 800 | 25 | 25 | 25 | 125 |
| JST138H-600D | JJM | TO-251 | 12 | 95 | 600 | 5 | 5 | 5 | 125 |
| JST138H-600E | JJM | TO-251 | 12 | 95 | 600 | 10 | 10 | 10 | 125 |
| JST138H-600F | JJM | TO-251 | 12 | 95 | 600 | 25 | 25 | 25 | 125 |
| JST138H-800D | JJM | TO-251 | 12 | 95 | 800 | 5 | 5 | 5 | 125 |
| JST138H-800E | JJM | TO-251 | 12 | 95 | 800 | 10 | 10 | 10 | 125 |
| JST138H-800F | JJM | TO-251 | 12 | 95 | 800 | 25 | 25 | 25 | 125 |
| JST138K-1600E | JJM | TO-252 | 12 | 70 | 1600 | 10 | 10 | 10 | 125 |
| JST138K-600D | JJM | TO-252 | 12 | 95 | 600 | 5 | 5 | 5 | 125 |
| JST138K-600E | JJM | TO-252 | 12 | 95 | 600 | 10 | 10 | 10 | 125 |
| JST138K-600F | JJM | TO-252 | 12 | 95 | 600 | 25 | 25 | 25 | 125 |
| JST138K-800D | JJM | TO-252 | 12 | 95 | 800 | 5 | 5 | 5 | 125 |