SP721
100
T
A
= 25
o
C
SINGLE PULSE
2.5
T
A
= 25
o
C
SINGLE PULSE
80
FORWARD SCR CURRENT (mA)
FORWARD SCR CURRENT (A)
2
60
1.5
40
1
I
FWD
EQUIV. SAT. ON
THRESHOLD ~ 1.1V
V
FWD
20
0.5
0
600
800
1000
1200
FORWARD SCR VOLTAGE DROP (mV)
0
0
1
2
FORWARD SCR VOLTAGE DROP (V)
3
FIGURE 2. LOW CURRENT SCR FORWARD VOLTAGE DROP
CURVE
FIGURE 3. HIGH CURRENT SCR FORWARD VOLTAGE DROP
CURVE
+V
CC
+V
CC
INPUT
DRIVERS
OR
SIGNAL
SOURCES
LINEAR OR
DIGITAL IC
INTERFACE
IN 1 - 3
IN 5 - 7
TO +V
CC
V+
SP721
V-
SP721 INPUT PROTECTION CIRCUIT (1 OF 6 SHOWN)
FIGURE 4. TYPICAL APPLICATION OF THE SP721 AS AN INPUT CLAMP FOR OVER-VOLTAGE, GREATER THAN 1V
BE
ABOVE V+ OR
LESS THAN -1V
BE
BELOW V-
6-11