SST12B-800CW vs SST08A-800CW
| Part Number |
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| Category | Thyristors - TRIACs | Thyristors - TRIACs |
| Manufacturer | SMC Diode Solutions | SMC Diode Solutions |
| Description | 800V 12A PACKAGE TO-220B 3-QUADR | 800V 8A PACKAGE TO-220A 3-QUADRA |
| Package | -Reel® | Tape & Reel (TR) |
| Series | SST12 | SST08 |
| 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-220AIns |
| 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 | 1.5 V |
| Current - Gate Trigger (Igt) (Max) | 35 mA | 35 mA |
| Current - On State (It (RMS)) (Max) | 12 A | 8 A |
| Current - Non Rep. Surge 50, 60Hz (Itsm) | 120A @ 50Hz | 80A @ 50Hz |
| Triac Type | Standard | Standard |
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1. What is a TRIAC, and how does it differ from an SCR?
A TRIAC is a bidirectional device that can control AC power, effectively working as two SCRs in parallel but in opposite directions. Unlike an SCR, which only conducts in one direction, a TRIAC operates in both directions, making it ideal for AC applications.
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2. What are the main uses of TRIACs?
TRIACs are commonly used in phase control applications like light dimmers, motor speed controls, and heaters, as well as in domestic appliances where bidirectional AC control is needed.
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3. 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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4. What precautions should be taken when using TRIACs with inductive loads?
Inductive loads can cause dv/dt turn-on issues. Adding a snubber circuit or using a zero-crossing detection mechanism can prevent premature triggering.
