Littelfuse SxSx Series - Manual (Page 5)

193
Revised: 09/23/13
©2013 Littelfuse, Inc
Specifications are subject to change without notice.
Teccor ® brand Thyristors
0.8 Amp Sensitive SCRs
EC103xx & SxSx Series
0.1
1.0
10.0
100.0
1 10 100 1000
Surge Current Duration -- Full Cycles
Peak Surge (Non-repetitive)
On-state Current (I
TSM
) – Amps
Figure 12: Surge Peak On-State Current vs. Number of Cycles
Figure 13: Simple Test Circuit for Gate Trigger Voltage and Current
SUPPLY FREQUENCY: 60 Hz Sinusoidal
LOAD: Resistive
RMS On-State Current: [I
T(RMS)
]: Maximum Rated
Value at Specified Case Temperature
Notes:
1. Gate control may be lost during and immediately
following surge current interval.
2. Overload may not be repeated until junction
temperature has returned to steady-state
rated value.
Note: V1 — 0 V to 10 V dc meter
V
GT
— 0 V to 1 V dc meter
I
G
— 0 mA to 1 mA dc milliammeter
R1 — 1 k potentiometer
To measure gate trigger voltage and current, raise gate
voltage (V
GT
) until meter reading V1 drops from 6 V to 1 V.
Gate trigger voltage is the reading on V
GT
just prior to V1
dropping. Gate trigger current I
GT
Can be computed from
the relationship
V
GT I
GT
= I
G
- ____ Amps
1000
where I
G
is reading (in amperes) on meter just prior to V1
dropping
Note: I
GT
may turn out to be a negative quantity (trigger
current flows out from gate lead). If negative current
occurs, I
GT
value is not a valid reading. Remove 1 k resistor
and use I
G
as the more correct I
GT
value. This will occur on
12 μA gate products.
Reset
Normally-closed
Pushbutton
6V
DC
+
–
D.U.T.
100
R1
1 k
(1%)
100
I
GT
I
G
IN4001
V1
V
GT