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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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.

These devices are made specifically for improved commutation and can often control reactive loads without the use of a snubber circuit. In most applications, the datqsheet current comes from MT2, so quadrants 1 and 3 datashedt the only operating modes both gate and MT2 positive or negative against MT1.

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Snubber circuits are also used to prevent premature triggering, caused for example by voltage spikes in the mains supply. This is because it is the only quadrant where gate current is injected directly into the base of one of the main device transistors. Figure 5 shows the triggering process. As forward-biasing implies the injection of minority carriers in the two layers joining the 6000b, electrons are injected in the p-layer under the gate.

The minimum current able to do this is called gate threshold current and is generally indicated by I GT.

BTA12-600B TO-220 TRIAC

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. Later versions are sold under the trademark “Snubberless”. The equivalent circuit is depicted in Figure 4.

The TRIAC’s gate can be connected through an opto-isolated transistor, and sometimes a resistor bat12 the microcontroller, so that bringing the voltage down to the microcontroller’s logic zero pulls enough current through the TRIAC’s gate to trigger it.

  ASTM C1396 PDF

In the first phase, the pn junction between the MT1 terminal and the gate btz12 forward-biased step 1. This is similar to the recovery in standard diodes: Some of these electrons do not recombine and escape to the underlying n-region step 2.

The N region attached to MT2 does not participate significantly.

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

Solid state switches Power electronics.

Capacitor types Ceramic resonator Crystal oscillator Inductor Parametron Relay reed relay mercury switch. For the green vehicle, see Triac car. Generally, this quadrant is the least sensitive of the four [ clarification needed Why is quadrant 4 the least sensitive? This in turn lowers the potential of the n-region, acting as the base of a pnp transistor which switches on turning the transistor on without directly lowering the base potential is called remote gate control.

The mechanism is illustrated in Figure 3. Retrieved June datashee, 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.

A thyristor is analogous to a relay in that a small voltage and current can control a much datashset voltage and current. Therefore, the red arrow labeled with a “3” in Figure 6 shows the final conduction path of the current.

For triiodothyroacetic acid, see Tiratricol. When mains voltage TRIACs are triggered by microcontrollers, optoisolators are frequently used; datashewt example optotriacs can be used to control the gate current. Because each SCR will have an entire half-cycle of reverse polarity voltage applied to it, turn-off of the SCRs is assured, no matter what the character of the load.

So, in the end, the structure which is crossed by the major portion of the current is the same as quadrant-I operation “3” in Figure 5. However, the structure is different from SCRs. 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.


In other projects Wikimedia Commons. 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.

PDF BTA12-600B Datasheet ( Hoja de datos )

Quadrant 4 operation occurs when the gate is positive and MT2 is negative with respect to MT1. In a typical TRIAC, the gate threshold current is generally a few milliamperes, but one has to take into account also that:.

By using this datashdet, you agree to the Terms of Use and Privacy Policy. Quadrant 1 operation occurs when the gate and MT2 are positive with respect to MT1.

BTAB datasheet, Pinout ,application circuits Triacs

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. 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.

In this section, a few are summarized. The gate current makes an equivalent NPN transistor switch on, which bta1 turn draws current from the base of an equivalent PNP transistor, turning it on also. This switches on a structure composed by an NPN transistor and a PNP transistor, which has the gate as cathode the turn-on of this structure is indicated by “1” in the figure.