
Document Number: 83640
www.vishay.com
Revision 17-August-01
2–100
FEATURES
7400 Series T2L Compatible
Transfer Ratio, 35% Typical
Coupling Capacitance, 0.5 pF
Single, Dual, & Quad Channel
Industry Standard DIP Package
Underwriters Lab File #E52744
VDE Approvals #0884
(Optional with Option 1, Add -X001 Sufx)
DESCRIPTION
The IL74 is an optically coupled pair with a
Gallium Arsenide infrared LED and a silicon
NPN phototransistor. Signal information,
including a DC level, can be transmitted by the
device while maintaining a high degree of
electrical isolation between input and output.
The IL74 is especially designed for driving
medium-speed logic, where it may be used to
eliminate troublesome ground loop and noise
problems. Also it can be used to replace relays
and transformers in many digital interface
applications, as well as analog applications
such as CRT modulation.
The ILD74 has two isolated channels in a sin-
gle DIP package; the ILQ74 has four isolated
channels per package.
V
DE
pin one ID
.255 (6.48)
.268 (6.81)
.379 (9.63)
.390 (9.91)
.030 (0.76)
.045 (1.14)
4
° typ.
.100 (2.54) typ.
10
°
3
°–9°
.300 (7.62)
typ.
.018 (.46)
.022 (.56)
.008 (.20)
.012 (.30)
.110 (2.79)
.130 (3.30)
.150 (3.81)
.020 (.51 )
.035 (.89 )
.230(5.84)
.250(6.35)
4
3
2
1
.031 (0.79)
.050 (1.27)
5
6
78
.255 (6.48)
.265 (6.81)
.779 (19.77 )
.790 (20.07)
.030 (.76)
.045 (1.14)
4
°
.100 (2.54)typ.
10
°
typ.
3
°–9°
.018 (.46)
.022 (.56)
.008 (.20)
.012 (.30)
.110 (2.79)
.130 (3.30)
pin one ID
.130 (3.30)
.150 (3.81)
.020(.51)
.035 (.89)
8
7
6
5
4
3
2
1
9
10
11 12
13
14
15
16
.031(.79)
.300 (7.62)
typ.
.230 (5.84)
.250 (6.35)
.050 (1.27)
1
2
3
4
8
7
6
5
Emitter
Collector
Emitter
Anode
Cathode
Anode
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
Emitter
Collector
Emitter
Collector
Emitter
Anode
Cathode
Anode
Cathode
Anode
.010 (.25)
typ.
.114 (2.90)
.130 (3.0)
.130 (3.30)
.150 (3.81)
.031 (0.80) min.
.300 (7.62)
typ.
.031 (0.80)
.035 (0.90)
.100 (2.54) typ.
.039
(1.00)
Min.
.018 (0.45)
.022 (0.55)
.048 (0.45)
.022 (0.55)
.248 (6.30)
.256 (6.50)
.335 (8.50)
.343 (8.70)
pin one ID
6
5
4
1
2
3
18
°
3
°–9°
.300–.347
(7.62–8.81)
4
°
typ.
Dimensions in inches (mm)
Single Channel
Dual Channel
Quad Channel
1
2
3
6
5
4
Base
Collector
Emitter
Anode
Cathode
NC
Single Channel
IL74
Dual Channel
ILD74
Quad Channel
ILQ74
Phototransistor Optocoupler