51
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 Suffix)
DESCRIPTION
The IL74 is an optically coupled pair with a Gal-
lium 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 gound
loop and noise problems. Also it can be used to
replace relays and transformers in many digital
interface applications, as well as analog applica-
tions such as CRT modulation.
The ILD74 has two isolated channels in a single
DIP package; the ILQ74 has four isolated chan-
nels per package.
V
D E
Dimensions in inches (mm)
.008 (.20)
.012 (.31)
.130 (3.30)
.150 (3.81)
.130 (3.30)
.150 (3.81)
.280 (7.11)
.330 (8.38)
.020 (.51)
.030 (.76)
.300 (7.62)
typ.
3
°
to 9
°
.0255 (.65)
typ.
.100 (2.54) typ.
.040 (1.02)
.050 (1.27)
.016 (.41)
.020 (.51)
1
2
3
.240 (6.10)
.260 (6.60)
.780 (19.81)
.800 (20.32)
pin one
ID.
14
9
8
.048 (1.22)
.052 (1.32)
.033 (.84)
typ.
16
15
.034 (.86)
6
7
4
5
10
11
12
13
.014
(.35)
typ.
1
2
3
4
8
7
6
5
Emitter
Collector
Collector
Emitter
Anode
Cathode
Cathode
Anode
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
Emitter
Collector
Collector
Emitter
Emitter
Collector
Collector
Emitter
Anode
Cathode
Cathode
Anode
Anode
Cathode
Cathode
Anode
1
2
3
6
5
4
Base
Collector
Emitter
Anode
Cathode
NC
.010 (.25)
.014 (.35)
.110 (2.79)
.150 (3.81)
.130 (3.30)
.150 (3.81)
.020 (.051) 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)
.248 (6.30)
.256 (6.50)
.335 (8.50)
.343 (8.70)
Pin One ID.
6
5
4
1
2
3
18
°
typ.
.300 (7.62)
.347 (8.82)
4
°
typ.
.268 (6.81)
.255 (6.48)
3
4
6
5
.390 (9.91)
.379 (9.63)
.045 (1.14)
.030 (.76)
4
°
Typ.
.100 (2.54) Typ.
10
°
Typ.
3
°
9
°
.305 typ.
(7.75) typ.
.022 (.56)
.018 (.46)
.012 (.30)
.008 (.20)
.135 (3.43)
.115 (2.92)
1
2
8
7
Pin One I.D.
.150 (3.81)
.130 (3.30)
.040 (1.02)
.030 (.76 )
SINGLE CHANNEL
IL74
DUAL CHANNEL
ILD74
QUAD CHANNEL
ILQ74
PHOTOTRANSISTOR OPTOCOUPLER
52
IL/ILD/ILQ74
Maximum Ratings
Emitter
(each channel)
Peak Reverse Voltage .....................................3.0 V
Continuous Forward Current .........................60 mA
Power Dissipationat 25
°
C...........................100 mW
Derate Linearly from 25
°
C ....................1.33 mW/
°
C
Detector
(each channel)
Collector-Emitter Breakdown Voltage ..............20 V
Emitter-Base Breakdown Voltage .......................5 V
Collector-Base Breakdown Voltage .................70 V
Power Dissipation at 25
°
C..........................150 mW
Derate Linearly from 25
°
C ......................2.0 mW/
°
C
Package
Isolation Test Voltage (t=1 sec.) ........ 5300 VAC
RMS
Isolation Resistance
V
IO
=500 V, T
A
=25
°
C ...............................
10
12
V
IO
=500 V, T
A
=100
°
C .............................
10
11
Total Package Dissipation
at 25
°
C Ambient (LED Plus Detector)
IL74.........................................................200 mW
ILD74 ......................................................400 mW
IL74Q ......................................................500 mW
Derate Linearly from 25
°
C
IL74.....................................................2.7 mW/
°
C
ILD74 ................................................5.33 mW/
°
C
ILQ74 ................................................6.67 mW/
°
C
Creepage ............................................... 7 mm min.
Clearance............................................... 7 mm min.
Storage Temperature ...................55
°
C to +150
°
C
Operating Temperature ...............55
°
C to +100
°
C
Lead Soldering Time at 260
°
C .................... 10 sec.
Electrical Characteristics
(T
A
=25
°
C)
Symbol
Min.
Typ.
Max.
Unit
Condition
Emitter
Forward Voltage
V
F
1.3
1.5
V
I
F
=20 mA
Reverse Current
I
R
0.1
100
µ
A
V
R
=3.0 V
Capacitance
C
O
25
pF
V
R
=0
Detector
Breakdown
Voltage,
Collector-Emitter
BV
CEO
20
50
V
I
C
=1 mA
Leakage Current,
Collector-Emitter
I
CEO
5.0
500
nA
V
CE
=5 V,
I
F
=0
Capacitance,
Collector-Emitter
C
CE
10.0
pF
V
CE
=0,
F=1 MHz
Package
DC Current Trans-
fer Ratio
CTR
DC
12.5
35
%
I
F
=16 mA,
V
CE
=5 V
Saturation Voltage,
Collector-Emitter
V
CEsat
0.3
0.5
V
I
C
=2 mA,
I
F
=16 mA
Resistance, Input
to Output
R
IO
100
G
Capacitance, Input
to Output
C
IO
0.5
pF
Switching Times
t
ON
,t
OFF
3.0
µ
s
R
E
=100
,
V
CE
=10 V,
I
C
=2 mA
Figure 1. Forward voltage versus forward current
Figure 2. Normalized non-saturated and saturated
CTR at T
A
=25
°
C versus LED current
Figure 3. Normalized non-saturated and saturated
CTR at T
A
=50
°
C versus LED current
Figure 4. Normalized non-saturated and saturated
CTR at T
A
=70
°
C versus LED current
100
10
1
.1
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
IF - Forward Current - mA
VF - Forward Voltage - V
Ta = -55
°
C
Ta = 25
°
C
Ta = 85
°
C
100
10
1
.1
0.0
0.5
1.0
1.5
NCTR(SAT)
NCTR
IF - LED Current - mA
Normalized to:
Vce = 10V, IF = 10mA
Ta = 25
°
C
CTRce(sat) Vce = 0.4V
NCTR - Normalized CTR
100
10
1
.1
0.0
0.5
1.0
1.5
NCTR(SAT)
NCTR
IF - LED Current - mA
Normalized to:
Vce = 10V, IF = 10mA, Ta = 25
°
C
Ta = 50
°
C
CTRce(sat) Vce = 0.4V
NCTR - Normalized CTR
100
10
1
.1
0.0
0.5
1.0
1.5
NCTR(SAT)
NCTR
IF - LED Current - mA
NCTR - Normalized CTR
Vce = 10V, IF = 10mA
Ta = 25
°
C
Ta = 70
°
C
CTRce(sat) Vce = 0.4V
Normalized to:
53
IL/ILD/ILQ74
Figure 5. Normalized non-saturated and saturated CTR
at T
A
=85
°
C versus LED current
Figure 6. Collector-emitter current versus temperature
and LED current
Figure 7. Collector-emitter leakage current versus
temperature
Figure 8. Normalized CTRcb versus LED current
and temperature
100
10
1
.1
0.0
0.5
1.0
1.5
NCTR(SAT)
NCTR
Normalized to:
Vce = 10V, IF = 10mA, Ta = 25
°
C
Ta = 85
°
C
CTRce(sat) Vce = 0.4V
IF - LED Current - mA
NCTR - Normalized CTR
60
50
40
30
20
10
0
0
5
10
15
20
25
30
35
50
°
C
70
°
C
85
°
C
IF - LED Current - mA
Ice - Collector Current - mA
25
°
C
100
80
60
40
20
0
-20
10
10
10
10
10
10
10
10
-2
-1
0
1
2
3
4
5
g
p
Ta - Ambient Temperature -
°
C
Iceo - Collector-Emitter - nA
TYPICAL
Vce = 10V
.1
1
10
100
0.0
0.5
1.0
1.5
25
°
C
50
°
C
70
°
C
IF - LED Current - mA
NCTRcb - Normalized CTRcb
Normalized to:
IF =10 mA
Vcb = 9.3 V
Ta = 25
°
C
Figure 9. Collector base photocurrent versus LED
current
Figure 10. Normalized photocurrent versus If and
temperature
Figure 11. Normalized non-saturated HFE versus
base current and temperature
Figure 12. Normalized saturated HFE versus base
current and temperature
100
10
1
.1
.01
.1
1
10
100
1000
IF - LED Current - mA
Icb - Collector Base
Photocurrent -
µ
A
Icb = 1.0357 *IF ^1.3631
Ta = 25
°
C
100
10
1
.1
.01
.1
1
10
NIB-Ta=-20
°
C
NIb,Ta=25
°
C
NIb,Ta=50
°
C
NIb,Ta=70
°
C
If LED Current mA
Normalized Photocurrent
Normalized to:
If = 10ma, Ta = 25
°
C
1
10
100
1000
0.4
0.6
0.8
1.0
1.2
Ib - Base Current -
µ
A
NHFE - Normalized HFE
Ib = 20
µ
A
Vce = 10 V
Ta = 25
°
C
-20
°
C
25
°
C
50
°
C
70
°
C
Normalized to:
1
10
100
1000
0.0
0.5
1.0
1.5
Ib - Base Current - (
µ
A)
NHFE(sat) - Normalized
Saturated HFE
-20
°
C
25
°
C
50
°
C
70
°
C
Normalized to:
Vce = 10V
Ib = 20
µ
A
Ta = 25
°
C
Vce = 0.4V
54
IL/ILD/ILQ74
Figure 14. Propagation delay versus collector load resis-
tor
100
10
1
.1
1
10
100
1000
1.0
1.5
2.0
2.5
RL - Collector Load Resistor - K
tpLH - Propagation Delay -
µ
s
tpHL - Propagation Delay -
µ
s
tpLH
tpHL
Ta = 25
°
C, IF = 10mA
Vcc = 5 V, Vth = 1.5 V
Figure 13. Propagation delay versus collector load resis-
tor
100
10
1
.1
1
10
100
1000
1.0
1.5
2.0
2.5
RL - Collector Load Resistor - K
tpLH - Propagation Delay -
µ
s
tpHL - Propagation Delay -
µ
s
tpLH
tpHL
Ta = 25
°
C, IF = 10mA
Vcc = 5 V, Vth = 1.5 V
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