BT139-600E,127

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Thyristors are a broad family of semiconductor power switching devices that are widely used in power electronics and motor control, incorporating many of the principles of transistors and diodes to operate or switch high power and voltage situations. TRIACs, or Thyristor TRIode AC Switches, are a type of thyristor device that particularly excels in AC switching and power control applications, combining the features of SCRs and BJTs in one package. Today’s TRIACs have evolved to become very reliable and robust, with excellent thermal and current handling features.

The BT139-600E,127 is a 600V/2A/127A PIM TRIAC. It has a series of features that include an industry standard Ultrafast high surge current capability, an IGT gate trigger current of 75mA maximum at 5V, a maximum turn on delay time of 25µs, a maximum turn off delay time of 80µs, an isolation voltage of 3-2kV and an operating temperature range from -40°C to 125°C. Its typical applications include power control and motor control, solid state relays, automatic temperature control, switching for resistive, thyristor and inductive loads, TRIAC based dimmer switches and power management in general.

A TRIAC consists of three main components: two main terminals, a gate and a body. Working on the basis of the diode-thyristor structure, the TRIAC is especially useful for AC circuits. The two main terminals are the AC supply terminals, which provide the onstate current flow. The gate terminal is used to turn the TRIAC on, which can be done via a low power (5V) DC gate current with a gate resistor. Once the TRIAC is turned on, a gate current of 1 mA is usually maintained to keep the TRIAC on, allowing a range of AC output power control.

In the BT139-600E,127, the gate current is set to not exceed 75mA and once the TRIAC is in an on-state, no current flows from the control gate to the main terminals. The TRIAC may be switched off in two ways: zero-crossing (ZC) and random turn-off. The ZC turn-off uses a logic signal at the gate terminal to switch off the TRIAC at the zero-crossing point of the AC cycle, whereas the random turn-off relies on a higher gate current (IGT) being applied to the gate terminal more than the holding current (IH) at any point in the AC cycle.

To optimize the BT139-600E,127’s efficiency, external snubber networks can be used on the main terminals to minimize the Switching losses. These networks use capacitors, resistors or a combination of both to absorb the energy fed back into the TRIAC terminals when the TRIAC is turned off. The use of an external resistor with the TRIAC also helps to reduce residual voltage after turn off.

The BT139-600E,127 is a high-quality semiconductor device designed with superior surge capability and a relatively fast turn-off response. It is the ideal choice for a range of AC switching and power control applications, particularly those that operate in higher power applications.

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