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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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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.

The lower p-layer works as the collector of this PNP transistor and has its voltage heightened: In the first phase, the pn junction between the MT1 terminal and the gate becomes forward-biased step 1. 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.

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.

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. Latching current is the minimum current that keeps the device internal structure latched in the absence of gate current. TRIACfrom triode for alternating currentis a generic trademark for a three terminal electronic component that conducts current in either direction when triggered.

Triggering in this quadrant is similar to triggering in quadrant III.

BTAB Datasheet(PDF) – Kersemi Electronic Co., Ltd.

For triiodothyroacetic acid, see Tiratricol. Alternatively, where safety allows and electrical isolation of the controller isn’t necessary, one of the microcontroller’s power rails may be connected datsheet of the mains supply.

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. Littelfuse also uses the name “Alternistor”.


By using this site, you agree to the Terms of Use and Privacy Policy. Later versions are sold under the trademark “Snubberless”. The mechanism is illustrated in Figure 3. Figure 5 shows the triggering process. Other three-quadrant TRIACs can operate with smaller gate-current to be directly driven by logic level components. As current into the gate increases, the potential of the left side of the p-silicon under the gate rises towards MT1, eatasheet the difference in potential between the bta21 and MT2 tends to lower: Generally, bat12 quadrant is the least sensitive of the four [ clarification needed Why is quadrant 4 the least sensitive?

The gate current makes an equivalent NPN transistor switch on, which in turn draws current from the datashest of an equivalent PNP transistor, turning it on also. A thyristor is analogous to a relay in that a small voltage and current can control a much larger voltage and current.

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

Bta41600b Datasheet Great Triac 12a Bta12 600b B6h5

In particular, if the pulse width of the gate current is sufficiently ddatasheet generally some tens of microsecondsthe TRIAC has completed the triggering process when the dxtasheet signal is discontinued and the latching current reaches a minimum level called holding current. 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. This is similar to the recovery in standard diodes: Low-power TRIACs are used in many applications such as light dimmersspeed controls for electric fans and other electric motorsand in the 600b computerized control circuits of many household 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.

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 potential is called remote gate control. This is because it is the only quadrant where gate current is injected directly into the base of one of the main device transistors.


When mains voltage TRIACs are triggered by microcontrollers, optoisolators are frequently used; for example optotriacs can be used to control the gate current. Quadrant 2 operation occurs when the gate is negative and MT2 is positive with respect to MT1.

This, however, increases the required trigger current or adds latency due to capacitor charging.

When switching on, the device starts to conduct current before the conduction finishes to spread across the entire junction. 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. Some of these electrons do not recombine and escape to the underlying n-region step 2. 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 datasheeet a current in its base.

In datasheets, the latching current is indicated as I Lwhile the holding current is indicated as I H. This, in turn, causes the p, n and p layers over MT2 to behave like a PNP transistor, which turns on because its n-type base becomes forward-biased with respect to its emitter MT2.

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.

PDF BTA12-600B Datasheet ( Hoja de datos )

Views Read 6600b View history. Thus, the triggering scheme is the same as an SCR. 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. Retrieved from ” https: The TRIAC’s gate can be connected through an opto-isolated transistor, and sometimes a dstasheet 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.