AN302 datasheet(6/10 Pages) STMICROELECTRONICS

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Holding current - the details

AN302

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Depending on the production batch, the holding current can vary. However, the dispersion

always remains below the limits specified in the data sheet. For a better perspective, here

are some figures:

●

sensitive TRIAC: IGT (QI): 5 mA (type TW), 2 mA < IH < 8 mA (specified IH max: 10 mA)

●

standard TRIAC: IGT (QI): 50 mA (type B), 8 mA < IH < 40 mA (specified IH max: 50

mA)

The minimum value of the IH parameter is not specified in the data sheets.

2.2

Variation of the holding current

2.2.1

Typical variation of IH with device sensitivity and direction of

commutation

The holding current, IH, is related to the gate firing current, IGT as shown in Table 1.

Example:

BTA/BTB12-600TW: if IGT (QI) = 1.5 mA then IH+ = 3.8 mA.

BTA/BTB12-600C: if IGT (QI) = 10 mA then IH+ = 14 mA.

In the case of the TRIAC (as opposed to the thyristor), it is important to note that current IH-

(electrode A2 negative with respect to A1) can be higher or lower than IH+ according to the

rated current and the device technology.

Example:

BTA/BTB06-600TW: if IH+ = 4.3 mA, IH- = 4.8 mA.

BTA/BTB12-600C: if IH+ = 15 mA, IH- = 8.3 mA.

2.2.2

Variation of IH with junction temperature

The holding current is physically related to the firing current, IGT. These two parameters vary

with the junction temperature as shown in Figure 7.

Example:

Triac TO-220AB, type BTA/BTB12-600C: IH = 20 mA at Tj = 25 °C and 14 mA at 110 °C.

Table 1.

Ratio between IH+ and IGT (QI) for sensitive and standard TRIACs

Triac

IH+ / IGT (QI)

Sensitive TRIAC 12 Arms (TW type)

2.5 (approx.)

Standard TRIAC 12 Arms (C type)

1.4 (approx.)

Table 2.

Ratio between IH+ and IH- for sensitive and standard TRIACs

Triac

IH+ / IH-

Sensitive TRIAC 12 Arms (TW type)

0.9 (approx.)

Standard TRIAC 12 Arms (C type)

1.8 (approx.)

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