STMicroelectronics T405Q-600H, Triac Type Logic - Sensitive Gate, 600 V Off State, 4 A RMS On State, Through Hole, TO-251-3 (IPAK), Tube.
| Parameter | Value |
|---|---|
| Triac type | Logic - Sensitive Gate |
| Mounting | Through Hole |
| Voltage - off state | 600 V |
| Voltage - gate trigger (Vgt) | 1.3 V |
| Current - hold (Ih) | 10 mA |
| Current - gate trigger (Igt) | 5 mA |
| Current - on state (It (RMS)) | 4 A |
| Current - non rep. surge 50, 60Hz | 35A, 38A |
| Operating temperature | -40°C ~ 125°C (TJ) |
| Package | Tube |
| Configuration | Single |
| Case | TO-251-3 Short Leads, IPak, TO-251AA |
The STMicroelectronics T405Q-600H is a logic-level sensitive-gate triac rated for 600 V off-state voltage and 4 A RMS on-state current. The 5 mA maximum gate trigger current (Igt) lets a microcontroller GPIO or a low-voltage logic output fire the triac directly, eliminating the driver transistor and its associated bias resistors. That saves roughly three components per phase on a BOM for a small appliance control or a solid-state relay front-end.
No, the T405Q-600H is Active in production with no end-of-life notice. It remains a current catalog item from STMicroelectronics.
The maximum gate trigger current (Igt) is 5 mA, making it a sensitive-gate triac suitable for direct drive from a logic-level output.
A triac is a bidirectional AC switch; once triggered it conducts until the current falls below the holding current (10 mA). For DC loads, the triac will not commutate off because the current never crosses zero, so it is not suitable for DC switching. Use a MOSFET or an IGBT for DC applications.
The I-PAK (TO-251) package pinout from left to right when the tab faces away: MT2 (main terminal 2), gate, MT1 (main terminal 1). The tab is internally connected to MT2.