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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The N region attached to MT2 does not participate significantly. This is similar to the recovery in standard diodes: These devices are made specifically for improved commutation and can often control reactive loads without the use of a snubber circuit.

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Its formal name is bidirectional triode thyristor or bilateral triode thyristor. Potentiometer digital Variable capacitor Varicap. Holding current is the minimum required current flowing between the two main terminals that keeps the device on after it datashheet achieved commutation in every part of its internal structure.

A thyristor is analogous to a relay in that a small voltage and current can control a much larger voltage and current.

In particular, TRIAC always has a small current flowing directly from the gate to MT1 through the p-silicon without passing through the p-n junction between the base and the emitter of the equivalent NPN transistor.

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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. The process uses a remote datasueet control and is illustrated in Figure 7. The lower datxsheet works as the collector of this PNP transistor and has its voltage heightened: Quadrants, 1 top right2 top left3 bottom left4 bottom right.

Quadrant 4 operation occurs when the gate is positive and MT2 is negative with respect to MT1. In these situations it is normal to connect the neutral terminal to the positive rail of the microcontroller’s power supply, together with A1 of the triac, with A2 connected to the live. The four quadrants are illustrated in Figure 1, and depend on the gate and MT2 voltages with respect to MT1. 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.


The process happens in different steps datashest too. As in the case of datasneet triggering in datasheeet III, this lowers the potential of the n-layer and turns on the PNP transistor formed by the n-layer and the two p-layers next to it. Once triggered, SCRs and TRIACs continue to conduct, even if the gate current ceases, until 6000b main current drops below a certain level called the holding current. When mains voltage TRIACs are triggered by microcontrollers, optoisolators are frequently used; for example optotriacs can be used to control the gate current.

By using this site, you agree to the Terms of Use and Privacy Policy. The value of this parameter varies with:.

The TRIAC’s gate can be connected through an opto-isolated transistor, and sometimes a resistor to 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.

In a typical TRIAC, the gate threshold current is generally a few milliamperes, but one has to take into account also that:. Views Read Edit View history. 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. They are typically in the order of some milliamperes. For triiodothyroacetic acid, see Tiratricol.

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. The equivalent circuit is depicted in Figure 4.

TRIACfrom triode for alternating currentis a generic trademark for a three terminal electronic component that conducts current in either direction when triggered. This is commonly used for controlling the speed of induction motorsdimming lamps, and controlling electric heaters.


Suppose one wants to turn the inductor off: However, the structure is different from SCRs. Capacitor types Ceramic resonator Crystal oscillator Inductor Parametron Relay reed relay mercury switch.

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This, however, increases the required trigger current or adds latency due to capacitor charging. The whole process is outlined in Figure 6. The minimum current able to do this is called gate threshold current and is generally indicated by I GT. The mechanism is illustrated in Figure 3. Figure 5 shows the triggering datasheeg. Therefore, the red arrow labeled with a “3” in Figure 6 shows the final conduction path of the current. 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.

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. The turn-on is due to a parasitic capacitive coupling of the gate terminal with the MT2 terminal, which lets currents into the gate in response to a large rate of datasheft change at MT2.

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In datasheets, the latching current is indicated bha12 I Lwhile the holding current is indicated as I H. 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. Quadrant 3 operation occurs when the gate and MT2 are negative with respect to MT1.

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

Solid state switches Power electronics. Triggering in this quadrant is similar to triggering in quadrant III. Retrieved June 28,