Overview
The BT137 and BT139 are both triacs in TO-220C package.However, they differ in terms of current rating, voltage rating, and intended applications. Here’s a detailed comparison:
Mechanical Data
| Feature | BT137 | BT139 |
|---|---|---|
| Type | Triac | Triac |
| Max Repetitive Off-State Voltage (V<sub>DRM</sub>) | 600V / 800V | 600V / 800V |
| Max RMS On-State Current (I<sub>T(RMS)</sub>) | 8A | 16A |
| Surge Current (I<sub>TSM</sub>) | ~65A | ~140A |
| Gate Trigger Current (I<sub>GT</sub>) | 5–50 mA | 5–50 mA |
| Package Type | TO-220C | TO-220C / TO-220F / others |
| Typical Applications | Small appliances, light dimmers | Inductive loads, motor controls |
Current Rating
BT137:
- 8A RMS (on-state current)
- Suitable for medium-power applications like light dimmers, motor controls, and small appliances.
BT139:
- 16A RMS (on-state current)
- Designed for higher-power applications such as industrial controls, heaters, and larger motor drives.
Applications
BT137:
- Light dimmers
- Small motor controls
- Household appliances
BT139：
- Industrial AC switches
- High-power heaters
- Larger motor controllers
Summary
Both are reliable triacs, but the choice depends on your current requirements and thermal considerations.
Product Line
For more product details, please visit our official website:
https://en.semiware.com/product-4q-triac/bt139-600e
https://en.semiware.com/product-4q-triac/bt137-600e
About Semiware
Semiware has a comprehensive product lineup of circuit protection device products. The company leverages its technology in the semiconductor field and application background in end products to serve customers in the electronics, automotive and industrial markets. For more information, please visit semiware official website: https://en.semiware.com/
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