16-08-2012, 01:00 PM
Frequently asked questions
1Frequently.pdf (Size: 493.17 KB / Downloads: 50)
Q. What’s the main difference between 3Q and standard (4Q) triacs?
A 3Q (or ‘Hi-com’) triac allows triggering in quadrants I, II and III only. A
standard triac can be triggered in all 4 modes.
Q. What benefits do 3Q triacs provide to the circuit designer?
Reliable circuit designs using 4Q triacs to control non-resistive loads must
include additional protection components to minimize the risk of false triggering
(uncontrolled triac conduction). These comprise an RC Snubber across the
triac’s main terminals and an inductor in series with the triac. 3Q triacs have
eliminated/reduced the need for protection components, making circuit design
for non-resistive loads more reliable, cheaper and smaller.
Q. Which 3Q triacs are available from Philips Semiconductors?
We provide the widest 3Q triac portfolio, in a variety of leaded and surface
mount packages. The range covers 1 A, sensitive-gate, surface-mount triacs to
25 A leaded devices.
Q. For which applications are 3Q triacs beneficial?
Any application that has a non-resistive load. For example, domestic/industrial
motor control applications, transformer loads and ignition circuits.
Q. Which 3Q triac will provide the best immunity to loss of control?
There is an inverse relationship between gate sensitivity and commutation ability,
i.e. the lower the gate sensitivity, the better the commutation performance.
Therefore the B series, which have the least sensitive gates, should be used in
applications which require a high immunity to loss of control.
Q. Which 3Q triac is best for applications with a limited drive current?
The D and E series, with respective gate sensitivities of IGT = 5 mA and
IGT = 10 mA, offer the highest gate sensitivity. Therefore, they’re easily driven
by low drive-current logic and microcontroller outputs.
Q. Which triac should be selected if a slightly better commutation ability, than that
offered by the D/E series, is required?
An F-series type. With an IGT of 25 mA, it offers a good compromise between
gate sensitivity and commutation performance.
Q. Which packages are currently available?
Leaded: T0220AB (SOT78), SOT186A (isolated TO220AB) and SOT82.
Surface-mount: SOT223, DPAK (SOT428) and D2PAK (SOT404).
1Frequently.pdf (Size: 493.17 KB / Downloads: 50)
Q. What’s the main difference between 3Q and standard (4Q) triacs?
A 3Q (or ‘Hi-com’) triac allows triggering in quadrants I, II and III only. A
standard triac can be triggered in all 4 modes.
Q. What benefits do 3Q triacs provide to the circuit designer?
Reliable circuit designs using 4Q triacs to control non-resistive loads must
include additional protection components to minimize the risk of false triggering
(uncontrolled triac conduction). These comprise an RC Snubber across the
triac’s main terminals and an inductor in series with the triac. 3Q triacs have
eliminated/reduced the need for protection components, making circuit design
for non-resistive loads more reliable, cheaper and smaller.
Q. Which 3Q triacs are available from Philips Semiconductors?
We provide the widest 3Q triac portfolio, in a variety of leaded and surface
mount packages. The range covers 1 A, sensitive-gate, surface-mount triacs to
25 A leaded devices.
Q. For which applications are 3Q triacs beneficial?
Any application that has a non-resistive load. For example, domestic/industrial
motor control applications, transformer loads and ignition circuits.
Q. Which 3Q triac will provide the best immunity to loss of control?
There is an inverse relationship between gate sensitivity and commutation ability,
i.e. the lower the gate sensitivity, the better the commutation performance.
Therefore the B series, which have the least sensitive gates, should be used in
applications which require a high immunity to loss of control.
Q. Which 3Q triac is best for applications with a limited drive current?
The D and E series, with respective gate sensitivities of IGT = 5 mA and
IGT = 10 mA, offer the highest gate sensitivity. Therefore, they’re easily driven
by low drive-current logic and microcontroller outputs.
Q. Which triac should be selected if a slightly better commutation ability, than that
offered by the D/E series, is required?
An F-series type. With an IGT of 25 mA, it offers a good compromise between
gate sensitivity and commutation performance.
Q. Which packages are currently available?
Leaded: T0220AB (SOT78), SOT186A (isolated TO220AB) and SOT82.
Surface-mount: SOT223, DPAK (SOT428) and D2PAK (SOT404).