AN2703

Parameters

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Threshold voltage

Dynamic on-state resistance

These two parameters are used to calculate the instantaneous voltage drop

They are also useful to calculate the power dissipation of the device:

For SCR:

For TRIACs:

Maximum forward and reverse leakage current (SCRs, TRIACs and ACS)

Maximum leakage current for diodes

This is the current flowing through the device when it is in the OFF state, at the

specified VDRM or VRRM value for TRIACs or SCRs, or VR for diodes or

DIACs.

Please refer to Appendix A: Testing method for parameters.

Turn-on time

This is the time between the beginning of the gate current pulse (10% of its peak

value) and when the A-K voltage of the SCR or A2-A1 voltage of the TRIAC has

fallen down to 10% of its previous stand-off value.

Turn-off time

This parameter is specific to SCRs. After this time, a positive voltage rate can be

applied across Anode and Cathode without causing any spurious firing. This

parameter defines the maximum operating frequency of the SCR.

Delay time

This is the time between the beginning of the gate current pulse (10% of its peak

value) and the beginning of the decrease of the A2-A1 or A-K voltage (90% of its

peak value).

Rise time

For a DIAC, this is the time between 10% and 90% of the peak current

generated when the component discharge a specified capacitor into a specified

load.

Breakdown voltage

This is the voltage across the device, at off-state, measured at a specified

current level. This parameter is specific for some ASDTM and protection

devices.

αT

Temperature coefficient

This is the positive temperature coefficient of the breakover voltage. This

parameter is generally specified in percentage, for specific devices.

Output voltage

For a DIAC, this is the peak voltage across a 20

Ω resistor in series with the

device during the discharge of a specified capacitor.

Table 2.

Electrical characteristics parameters (continued)

Parameter

Name and description

2

)

RMS

(

T

d

)

AV

(

T

0

t

I

R

I

V

P´

+

´

=

2

)

RMS

(

T

d

)

RMS

(

T

0

t

I

R

I

V

2

2

P´

+

´

=

p