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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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.

BTAB BTA12 TRIAC V 12A TOAB – SmartTronik Prishtinë

In many cases this is sufficient to lower the impedance of the gate towards MT1. Suppose one wants to turn the inductor off: The N region attached to MT2 is active, but the N region attached to MT1 only participates in the initial triggering, not the bulk datasheft flow.

Generally, this quadrant is the least sensitive of the four [ clarification needed Why is quadrant 4 the least sensitive? However, the structure is different from SCRs.

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

The lower p-layer works as the collector of this PNP transistor and has datashheet voltage heightened: 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.

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


The current and voltage are out of phase, so when the current decreases below the holding value, the TRIAC attempts to turn off, but because of catasheet phase shift between current and voltage, a sudden voltage step takes place between the two main terminals, which turns the device on again.

Quadrant 4 operation occurs when the gate is positive and MT2 is negative with respect to MT1. Triggering in this quadrant is similar to triggering in quadrant III.

In most applications, the gate current comes from MT2, so quadrants 1 and 3 are the only operating modes both gate and MT2 positive or negative against MT1. The reason is that during the commutation, the power dissipation is not uniformly distributed across the device. This page was last edited on 26 Julyat By putting a resistor datasheeet 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.

Low-power TRIACs are used in many applications such as light dimmersspeed controls for electric fans and other electric motorsand in the modern computerized control circuits of many household small and major appliances.

Potentiometer digital Variable capacitor Varicap. Littelfuse also uses the name “Alternistor”. The value of this parameter varies with:.

The minimum current able to do this is called gate threshold current and is generally indicated by I GT. From Wikipedia, the free encyclopedia. Views Read Edit View history.

BTA12-600B TO-220 TRIAC

Retrieved June 28, 60b They are typically in the order of some milliamperes. 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.

The four quadrants are illustrated in Figure 1, and depend on the gate and MT2 voltages with respect to MT1. Capacitor types Ceramic resonator Crystal oscillator Inductor Parametron Relay reed relay mercury switch.


These devices are made specifically for improved commutation and can often control reactive loads without the use of a snubber circuit. 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.

Sunrom Electronics/Technologies

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.

This is similar to the recovery in standard diodes: In the first phase, the pn junction between the MT1 terminal and the gate becomes forward-biased step 1.

Some of these electrons do not recombine and escape to the underlying n-region step 2. In particular, if the pulse width of the gate current is sufficiently large generally some tens of microsecondsthe TRIAC has completed the datassheet process when the gate signal is discontinued and the latching current reaches a minimum level called datasheft current.

This in turn lowers the potential of the n-region, acting as the base of a pnp transistor which switches on turning the transistor on without directly lowering the base datadheet is called remote gate control. In this case, the injection of holes in the p-silicon makes the stacked n, p and n layers beneath MT1 behave like a NPN transistor, which turns on due to the presence of a current in its base.