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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Solid state switches Power electronics. 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.

They are typically in the order of some milliamperes. 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.

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. In other projects Wikimedia Commons. 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. 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. Low-power TRIACs are dqtasheet in many applications such as light dimmersspeed controls for electric fans and other electric motorsand in the modern computerized control circuits of many 600n small and major appliances.


As in the case of a triggering in quadrant 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.

The process uses a remote gate control and is illustrated in Figure 7. 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.

When switching on, the device starts to conduct current before the conduction finishes to spread across the entire junction. Generally, this quadrant is the least sensitive of the four [ clarification needed Why is quadrant 4 the least sensitive? For triiodothyroacetic acid, see Tiratricol. From Wikipedia, the free encyclopedia. Later versions are sold under the trademark “Snubberless”.

BTAB NTE Equivalent NTE TRIACVRM 25A TO – Wholesale Electronics

For the green vehicle, see Triac car. In many cases this is sufficient to lower the impedance of the gate towards MT1.

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. This, however, increases the required trigger current or adds latency due to capacitor charging. The lower p-layer works as the collector of this PNP transistor and has its voltage heightened: 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. Therefore, the red arrow labeled with a “3” in Figure 6 shows the final conduction path of the current. This switches on a structure composed by an NPN transistor and a PNP dtasheet, which has the gate as cathode the turn-on of this structure is indicated by “1” in the figure.


By putting a dxtasheet 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. This is similar to the recovery in standard diodes: 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.

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. 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.

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