Sensitive SCRs Data Sheets
http://www.littelfuse.com E5 - 10 ©2004 Littelfuse, Inc.
+1 972-580-7777 Thyristor Product Catalog
Figure E5.17 Power Dissipation (Typical) versus RMS On-state Current
Figure E5.18 Normalized DC Latching Current versus Case Temperature
Figure E5.19 Simple Test Circuit for Gate Trigger Voltage and
Current Measurement
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 trig-
ger current I
GT
can be computed from the relationship
where I
G
is reading (in amperes) on meter just prior to V1 drop-
ping.
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.
024681
0
2
4
6
8
10
12
RMS On-state Current [I
T(RMS)
] – Amps
CURRENT WAVEFORM: Half Sine Wave
LOAD: Resistive or Inductive
CONDUCTION ANGLE: 180˚
Average On-state
Power Dissipation [P
D(AV)
] – Watts
6 A to 10 A
TO-220, TO-202,
TO-251, and TO-252
-65 -15 +25 +65 +110 +125-40
0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
Case Temperature (T
C
) – ˚C
Ratio of
I
L
I
L
(
T
C
= 25 ˚C)
See General Notes for specific device
operating temperature range.
V1
6 V
DC
+
–
100
D.U.T.
Reset
Normally-closed
Pushbutton
1 k
(1%)
I
G
V
GT
100
I
GT
R1
IN4001
I
GT
I
G
V
GT
1000
-------------
Amps–=
