TVS Diode Arrays
Electronic Protection Array for ESD and Overvoltage Protection
SP721
100
T A = 25 o C
2.5
T A = 25 o C
80
60
40
SINGLE PULSE
2
1.5
1
SINGLE PULSE
I FWD
20
0
0.5
0
EQUIV. SAT. ON
THRESHOLD ~ 1.1V
V FWD
600
800
1000
1200
0
1 2
3
FORWARD SCR VOLTAGE DROP (mV)
FIGURE 2. LOW CURRENT SCR FORWARD VOLTAGE DROP
CURVE
+V CC
INPUT
DRIVERS
OR
SIGNAL
SOURCES
FORWARD SCR VOLTAGE DROP (V)
FIGURE 3. HIGH CURRENT SCR FORWARD VOLTAGE DROP
CURVE
+V CC
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-
236
w w w. l i t t e l f u s e . c o m
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