SST12B-800CW vs T1235T-8R
| Part Number |
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| Category | Thyristors - TRIACs | Thyristors - TRIACs |
| Manufacturer | SMC Diode Solutions | STMicroelectronics |
| Description | 800V 12A PACKAGE TO-220B 3-QUADR | THYRISTORS (SCR) AND AC SWITCHES |
| Package | -Reel® | Tube |
| Series | SST12 | Snubberless™ |
| Operating Temperature | -40°C ~ 125°C (TJ) | -40°C ~ 125°C (TJ) |
| Mounting Type | Through Hole | Through Hole |
| Package / Case | TO-220-3 | TO-220-3 |
| Supplier Device Package | TO-220B | TO-220 |
| Configuration | Single | Single |
| Current - Hold (Ih) (Max) | 40 mA | 40 mA |
| Voltage - Off State | 800 V | 800 V |
| Voltage - Gate Trigger (Vgt) (Max) | 1.3 V | 1.3 V |
| Current - Gate Trigger (Igt) (Max) | 35 mA | 35 mA |
| Current - On State (It (RMS)) (Max) | 12 A | 12 A |
| Current - Non Rep. Surge 50, 60Hz (Itsm) | 120A @ 50Hz | 90A, 95A |
| Triac Type | Standard | Alternistor - Snubberless |
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1. Why do TRIACs require a DIAC for triggering?
DIACs improve the symmetry of TRIAC firing by ensuring consistent triggering voltages in both directions. This reduces harmonic distortion in AC circuits, enhancing performance.
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2. What are the limitations of TRIACs?
TRIACs are less efficient for high-power or complex control systems due to asymmetric triggering and potential noise issues. They are more suited to low-to-medium power applications.
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3. How does dv/dt affect TRIAC performance?
A high rate of voltage change (dv/dt) across the TRIAC can unintentionally trigger it. Snubber circuits are used to limit dv/dt and ensure reliable operation.
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4. What are the key parameters to consider when selecting a TRIAC?
Important factors include voltage and current ratings, dv/dt capability, gate sensitivity, and application-specific requirements like power dissipation and thermal management.
