January 1, 2020

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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Other three-quadrant TRIACs can operate with smaller gate-current to be directly driven by logic level components. In the first phase, the pn nta12 between the MT1 terminal and the gate becomes forward-biased step 1. 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.

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. Alternatively, where safety allows and electrical isolation of the controller isn’t btta12, one of the microcontroller’s power rails may be connected one of the mains supply.

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. 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.

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. 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.


For the green vehicle, see Triac car. These devices are made specifically for improved commutation and can often control reactive loads without the use of a snubber circuit.

BTAB BTA12 TRIAC V 12A TOAB – SmartTronik Prishtinë

Retrieved June 28, Quadrants, 1 top right2 top left3 bottom left 600h, 4 bottom right. When switching on, the device starts to conduct current before the conduction finishes to spread across the entire junction. This, however, increases the required trigger current or adds latency due to capacitor charging.

TRIACfrom triode for alternating currentis a generic trademark for a three terminal electronic component that conducts current in either direction when triggered. The process happens in different steps here too.

Some of these electrons do not recombine and escape to the underlying n-region step 2. The value of this parameter varies with:. Because in the TRIAC there are parasitic resistances, a high reverse current in the p-n junctions inside it can provoke hta12 voltage drop between the gate region and the MT1 region which may make the TRIAC stay turned on.

Retrieved from ” https: Generally, this quadrant is the least sensitive of the four [ clarification needed Why is quadrant 4 the least sensitive? In particular, if the pulse width of the gate current is sufficiently large generally some tens of microsecondsthe TRIAC has completed the triggering process when the gate signal is discontinued and the latching current reaches a minimum level called holding current.

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This page was last edited on 26 Julyat In datasheets, the latching current is indicated as I Lwhile the holding current is indicated as I H. 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.


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.

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.

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. In other projects Wikimedia Commons.

600 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. Quadrant 3 operation occurs when the gate and MT2 are negative with respect to MT1. Later versions are sold under the trademark “Snubberless”. However, the structure is different from SCRs. TRIACs may also fail to turn on reliably with reactive loads if the current phase shift causes the main circuit current to be below the holding current at trigger time.

By using this site, you agree to the Terms of Use and Privacy Policy. 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.