AN439

Logic level and Snubberless TRIACs

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Logic level TRIACs use the breakthrough of the Snubberless technology to improve the

trade-off between sensitivity and commutation. Nevertheless, a snubber can still be

necessary with these TRIACs.

2.2

Performances and specifications

2.2.1

Logic level TRIACs

the TW type and 10 mA for the SW one.

In the datasheets of logic level TRIACs, a minimum (dI/dt)c is specified for the following

cases:

●

Resistive load with a (dV/dt)c of 0.1 V/µs.

●

Inductive load with a (dV/dt)c of 10 V/µs.

For example, a 6 A logic level TRIAC is specified as follows:

2.2.2

Snubberless TRIACs

This series covers the range of 6 to 25 A with gate currents of 35 mA (CW type) and 50 mA

(BW type). This series has been specially designed so that the TRIACs turn-off without

external snubber circuit.

For a same size and gate sensitivity, the (dI/dt)c improvement is at least equal to 2 between

Snubberless and standard TRIACs (see Figure 10).

Table 1.

(dI/dt)c and (dV/dt)c specifications for a 6 A logic level TRIAC

Symbol

Test Conditions

Quadrant

BTA06 / BTB06

Unit

TW

SW

(1)

1.

I - II - III

MAX.

5

10

mA

I - II - III

MAX.

1.3

V

2.

For both polarities of A2 referenced to A1

(dV/dt)c = 0.1 V/µs

MIN.

2.7

3.5

A/ms

(dV/dt)c = 10 V/µs

1.2

2.4

Without snubber

-

-