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 value of this parameter varies with:. Snubber circuits are also used to prevent premature triggering, caused for example by voltage spikes in the mains supply.


Solid state switches Power electronics. The process happens in different steps here too. 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.

Quadrant 1 operation occurs when the gate and MT2 are positive with respect to MT1. They are typically in the order of some milliamperes. In other projects Wikimedia Commons. The whole process is outlined in Figure 6.

BTA12-600B Datasheet PDF – SemiWell Semiconductor

Quadrant 2 operation occurs when the gate is negative and MT2 is positive with respect to MT1. 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.

In addition, applying a trigger at a controlled phase angle of the AC in the main circuit allows datashset of the average current flowing into a load phase control.

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

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 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. Retrieved June 28, Retrieved from ” https: Because each SCR will have an entire half-cycle datzsheet reverse polarity voltage applied to it, turn-off of the SCRs is assured, no matter what the character of the load.

Triggering in this quadrant is similar to triggering in quadrant III. This is because it is the only quadrant where gate current is injected directly into the base of one of the main device transistors. Generally, this quadrant is the least sensitive of the four [ clarification needed Why is quadrant 4 the least sensitive? Its formal name is bidirectional triode thyristor or bilateral triode thyristor.

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

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. 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. The four quadrants are illustrated in Figure 1, and depend on the gate and MT2 voltages with respect to MT1.

The turn-on of the device is three-fold and starts when the current from MT1 flows into the gate through the p-n junction under the gate.

Quadrant 3 operation occurs when the gate and MT2 are negative with respect to MT1.

From Wikipedia, the free encyclopedia. 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. Later versions are sold under the trademark “Snubberless”.


In this section, a few catasheet summarized.

Volt 20A TRIAC TO Isolated – NTE

For triiodothyroacetic acid, see Tiratricol. The N region attached to MT2 does not participate significantly. Therefore, the red arrow labeled with a “3” in Figure 6 shows the final conduction path of the current. Quadrants, 1 top right2 top left3 bottom left4 bottom right. The process uses a remote gate control and is illustrated in Figure 7. Thus, the triggering scheme is the same as an SCR.

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 voltage change at MT2. Littelfuse also uses the name “Alternistor”. These devices are made specifically for improved commutation and can often control reactive loads without the use of a snubber circuit.

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.

BTAB datasheet, Pinout ,application circuits Triacs

The equivalent circuit is depicted in Figure 4. This, however, increases the required trigger current or adds latency due to capacitor charging. This is commonly used for controlling the speed of induction motorsdimming lamps, and controlling electric heaters. Suppose one wants to turn the 60b off: The mechanism is illustrated in Figure 3.

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. Views Read Edit View history. Latching current is the minimum current that keeps the device internal structure latched in the absence of gate current.

For the green vehicle, see Triac car.