BT139B-600E,118 Discrete Semiconductor Products

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

Thyristors - TRIACs

A TRIAC (triode for alternating current) is a three-terminal solid-state device that acts as a switch for alternating current (AC). TRIACs can be thought of as an “on/off” switch, which responds to an AC signal. The main difference between a TRIAC and other thyristors is that it can handle both positive and negative cycles of the AC waveform and can begin and end current flow on either cycle.

BT139B-600E,118 application field and working principle

BT139B-600E TRIACs are mainly used to control low power AC devices in various fields of electronic and electrical engineering including motors, light dimming, heating control and lamp lighting. This BT139B-600E TRIAC has a sensitive gate and high current capacity. It is of Fast Switching type (VDRM 500V, ITM 100A) and a high reliability of operations.

The working principle of BT139B-600E TRIACs involves the conversion of a small signal at the gate (the control element) into a relatively large current flow through the main terminals. Once the gate current exceeds a certain threshold, the TRIAC begins to conduct current, getting it to turn ON. The gate current needed to turn ON the TRIAC can be obtained from a variety of sources including a manual switch, a control voltage or a microcontroller.

The working of the TRIAC can be explained as follows: When the gate-control signal at point A is converted to a small current through the gate, it creates a channel between terminal MT1 and MT2 of the TRIAC. This in turn allows the Positive half-cycle of the AC voltage to flow through it, thus turning it on. This process is repeated for the Negative half-cycle of the AC voltage in order to turn the TRIAC off.

Furthermore, BT139B-600E TRIACs can be programmed to only turn on and off at a certain point in the AC waveform. This enables users to regulate the current flow and is commonly used in many modern applications such as dimmer switches and motor control.

In conclusion, BT139B-600E TRIACs are widely used to control low-current AC devices in many electronic and electrical engineering applications. Their main advantage is that they can be programmed to only turn on and off at a certain point in the AC waveform, allowing users to have better control over the current flow.

The specific data is subject to PDF, and the above content is for reference