BT139-800E,127

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Thyristors - TRIACs

BT139-800E,127 is a 3-terminal dual triode thyristor device, which falls under the category of Thyristors – TRIACs. It is mainly used for two-way switch control, heater thermal overload protection, electric motor speed control, and proportion adjustment.

Features and Benefits

• Industrial temperature range from - 40°C to +125°C
• Integrated gate protection
• Low VCE(SAT) with internal diodes
• High surge current handling capability
• Low gate trigger power to minimize switching loss

Application fields and working principle

BT139-800E,127 is mainly used in half-wave and full-wave variable speed drive systems, AC voltage regulator, Automatic Flame Detectors, Biased Lighting Controls, Battery Chargers, DC Motors, Electronic Flags, Home Appliances, Intermittent Motors, Industrial Control, Lamp Ballasts (fluorescent and HID), Photovoltaic Systems, Rotary Tools, Starter Systems, and Switch Automation.

This device is basically an electrically controlled switch which works on the principle of a triode thyristor (TRIAC). It is made up of two independent thyristors in the same package. In order to ensure optimal performance, this device utilizes a gate protection feature which protects its internal thyristors from accidental destruction due to voltage spikes or electrical noise/transients. The device also has two internally connected diodes which help in dissipating spike voltages and provide surge current protection.

Furthermore, BT139-800E,127 is used in AC applications requiring a switch or a dimmer. Its working principle involves the triggering of the gate when a break-over current is passed. When this current passes through the gate and forward biasing is achieved, the TRIAC switches off and the current flow is changed to a forward direction in the opposite terminal. Additionally, as a function of gate current, the holding current is also lowered such that it can handle a minimum of 2A without switching off.

The device has a low voltage drop across its terminals when it is in the on-state, thus making it ideal for low-power applications. The device is also capable of withstanding voltage transients which allow it to adapt to changes in the load due to low gate voltages.

Conclusion

In conclusion, BT139-800E,127 is a 3-terminal dual triode thyristor device which falls under the category of Thyristors – TRIACs. This device is mainly used for two-way switch control, heater thermal overload protection, electric motor speed control, and proportion adjustment. The device works on the principle of a triode thyristor (TRIAC) and utilizes a gate protection feature which protects its internal thyristors. This device is also ideal for applications requiring a switch or a dimmer, due to its low voltage drop across its terminals and its ability to withstand voltage transients.

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