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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From Wikipedia, the free encyclopedia. Latching current is the minimum current that keeps the device internal structure latched in the absence of gate current.

A careful reading of the application notes provided btq12 the manufacturer and testing of the particular device model to design the correct network is in order. 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 whole process is outlined in Figure 6. Quadrant 1 operation occurs when the gate and MT2 are positive with respect to MT1. The four quadrants are illustrated in Figure 1, and depend on the gate and MT2 voltages with respect to MT1. A thyristor is analogous to a relay in that a small voltage and current can control a much larger voltage and current.

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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. Generally, this quadrant is the most sensitive of the four.

Its formal name is bidirectional triode thyristor or bilateral triode thyristor. This page was last edited on 26 Julyat Quadrant 3 operation occurs when the gate and MT2 are negative with respect to MT1. 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.


Therefore, the red arrow labeled with a “3” in Figure 6 shows the final conduction path of the current. TRIACfrom triode for alternating currentis a generic trademark for a three terminal electronic component that conducts current in either direction when triggered.


Once triggered, SCRs and TRIACs continue to conduct, even if the gate current ceases, until the main current drops below a certain level called the holding current. The mechanism is illustrated in Figure 3.

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 datashheet between the base and the emitter of the equivalent NPN transistor. See discussion ] In addition, dataasheet models of TRIACs logic level and snubberless types cannot be triggered in this quadrant but only in the other three.

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.

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A high rate of rise of the current between MT1 and MT2 in either direction when the device is turning on can damage or destroy the TRIAC even if the pulse duration is very short. This is similar to the recovery in standard diodes: 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.


Capacitor types Ceramic resonator Crystal oscillator Inductor Parametron Relay reed relay mercury switch.

They are typically in the order of some dahasheet. When the gate current is discontinued, if the datasneet between the two main terminals is more than what is called the latching currentthe device continues bta1 conduct. This is because it is the only quadrant where gate current is injected directly into the base of one of the main device transistors. Potentiometer digital Variable capacitor Varicap. 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.

Low-power TRIACs are used in many applications such as light btq12speed controls for electric fans and other electric motorsand in the modern computerized control circuits of many household small and major appliances. In this section, a few are summarized. In datasheets, the latching current is indicated as I Lwhile the holding current is indicated as I H. This is commonly used for controlling the speed of induction motorsdimming lamps, and controlling electric heaters.

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.

Suppose one wants to turn the inductor off: 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.

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