PHOTO SCR OPTOCOUPLERS
4N39
4N40
+100 V AC
Vp = 800 Volts
tp = .010 Seconds
100
Ω
f
T
= 25 Hertz
= 25
A
°C
DUT
+
H
Vp
Vp
.63 Vp
10 K
Ω
-
EXPONENTIAL
RAMP GEN.
OSCILLOSCOPE
dV / dt
tp
Fig. 13 Coupled dv/dt - Test Circuit
TYPICAL APPLICATIONS
10A, T2L COMPATIBLE, SOLID
STATE RELAY
LOAD
47
Ω
Use of the 4N40 for high sensi-
tivity, 5300 V isolation capability,
provides this highly reliable solid
state relay design. This design is
compatible with 74, 74S and 74H
series T2L logic systems inputs
and 220V AC loads up to 10A.
470
Ω
100 Ω
+5V
"CONTACT"
220 V AC
4N40
56K
"COIL"
SC1460
0.1 µF
IN5060 (4)
47
Ω
INDICATER
LAMP
25W, LOGIC INDICATOR LAMP DRIVER
The high surge capability and non-reactive input
470
Ω
+5V
characteristics of the 4N40 allow it to directly couple,
without buffers, T2L and DTL logic to indicator alarm
devices, without danger of introducing noise and
logic glitches.
4N40
56K
100
0.1
Ω
LOGIC
INPUT
220 V AC
µ
F
400V SYMMETRICAL TRANSISTOR COUPLER
4N40
Use of the high voltage PNP portion of the 4N40 provides a 400V transistor
capable of conducting positive and negative signals with current transfer
OUTPUT
INPUT
ratios of over 1%. This function is useful in remote instrumentation, high volt-
age power supplies and test equipment. Care should be taken not to exceed
the 40mW power dissipation rating when used at high voltages.
DS300381
2/27/01
5 OF 8
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