BTAB STMicroelectronics Triacs datasheet, inventory, & pricing. BTAB 12A Triacs. DESCRIPTION Available either in through-hole or surface-mount packages, the BTA/BTB12 and T12 triac series is suitable for general. DESCRIPTION. Available either in through-hole or surface-mount packages, the BTA12, BTB12 and T12 triac series is suitable for general.

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As forward-biasing implies the injection of minority carriers in the two layers joining the junction, electrons are injected in the p-layer under the gate. By putting a resistor or a small capacitor or both in parallel between these two terminals, the capacitive current generated during the transient flows out of the device without activating it. The value of this parameter varies with:.

Triggering in this quadrant is similar to triggering in quadrant III. A thyristor is analogous to a relay in that a small voltage and current can control a much larger voltage and current.

Latching current is the minimum current that keeps the device internal structure latched in the absence of gate current. Because in the TRIAC there are parasitic resistances, a high reverse current in the p-n junctions inside it can provoke a voltage drop between the gate region and the MT1 region which may make the TRIAC stay turned on.

This is similar to the recovery in standard diodes: In the first phase, the pn junction between the MT1 terminal and the gate becomes forward-biased step 1. Retrieved from ” https: Part of the gate current dotted line is lost through the ohmic path across the p-silicon, flowing directly into MT1 without passing through the NPN transistor base.

The lower p-layer works as the collector of this PNP transistor and has its voltage heightened: Views Read Edit View history. In this section, a few are summarized. The process uses a remote gate control and is illustrated in Figure 7. The reason is that during the commutation, the power dissipation is not uniformly distributed across the device.

Potentiometer digital Variable capacitor Varicap. The device typically starts to conduct the current imposed by the external circuitry after some nanoseconds or microseconds but the complete switch on of the whole junction takes a much longer time, so too swift a current rise may cause local hot spots that can permanently damage the TRIAC. Other applications with single polarity triggering from an IC or digital drive circuit operate in quadrants 2 and 3, than MT1 is usually connected to positive voltage e.

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As current flows from the p-layer under the gate into the n-layer under MT1, minority carriers in the form of free electrons are injected into the p-region and some of them are collected by the underlying n-p junction and pass into the adjoining n-region without recombining.

Thus, the triggering scheme is the same as an SCR. Its formal name is bidirectional triode thyristor or bilateral triode thyristor. This, however, increases the required trigger current or adds latency due to capacitor charging. In addition, applying a trigger at a controlled phase angle of the AC in the main circuit allows control of the average current flowing into a load phase control.

Therefore, the red arrow labeled with a “3” in Figure 6 shows the final conduction path of the current.

By using this site, you agree to dataxheet Terms of Use and Privacy Policy. Alternatively, where safety allows and electrical isolation of the controller isn’t necessary, one of the microcontroller’s power rails may be connected one of the mains supply. The equivalent circuit is depicted in Figure 4. A TRIAC starts conducting when a current flowing into or out of its gate is sufficient to turn on the relevant junctions in the quadrant of operation.

Retrieved June 28, Holding current is the minimum required current flowing between the two main terminals that keeps the device on after it has achieved commutation in every part of its internal structure.

BTAB (STMicroelectronics) – 12A TRIACS, Triacs

In other projects Wikimedia Commons. When used to control reactive inductive or capacitive loads, care must be taken to ensure that the TRIAC turns off correctly at the end of each half-cycle of the AC in the main circuit. The mechanism is illustrated in Figure 3.

The minimum current able to do this is called gate threshold current and is generally indicated by I GT. This is because it is the only quadrant where gate current is injected directly into the base of one of the main device transistors. Solid state switches Power electronics. In this case, the injection of holes in the p-silicon makes the stacked n, p and n layers beneath MT1 behave like a NPN transistor, which turns on due to the presence of a current in its base.


When switching on, the device starts to conduct current before the conduction finishes to spread across the entire junction.

See discussion ] In addition, some models of TRIACs logic level and snubberless types cannot be triggered in this quadrant but only in the other three. Quadrant 1 operation occurs when the gate and MT2 are positive with respect to MT1. This, in turn, causes the p, n and p layers over MT2 to behave like a PNP transistor, which turns on because its n-type base becomes forward-biased with respect to its emitter MT2.

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However, the structure is different from SCRs. A careful reading of the application notes provided by the manufacturer and testing of the particular device model to design the correct network is in order.

Other three-quadrant TRIACs can operate with smaller gate-current to be directly driven by logic level components. The whole process is outlined in Figure 6. Suppose one wants to turn the inductor off: When the gate current is discontinued, if the current between the two main terminals is more than what is called the latching currentthe device continues to conduct.

From Wikipedia, the free encyclopedia. The N region attached to MT2 is active, but the N region attached to MT1 only participates in the initial triggering, not the bulk current flow. This page was last edited on 26 Julyat As current into the gate increases, the potential of the left side of the p-silicon under the gate rises towards MT1, since the difference in potential between the gate and MT2 tends to lower:

Last modified: January 23, 2020