6-PIN PHOTOTRANSISTOR
OPTOCOUPLERS
CNX35U CNX36U CNX38U
DESCRIPTION
The CNX35U, CNX36U CNX38U and CNX39U are optically coupled isola-
tors consisting of an infrared emitting GaAs diode and a silicon NPN photo-
transistor with accessible base. These devices are housed in 6-pin dual-in-
line packages (DIP).
CNX39U
FEATURES
•
•
•
•
High output/input DC current transfer ratio
Low saturation voltage
UL recognized (File # E90700)
VDE recognized (File # 94766)
-Ordering option ‘300’ (e.g. CNX35U.300)
6
1
6
1
SCHEMATIC
6
1
APPLICATIONS
•
•
•
•
•
Power supply regulators
Digital logic inputs
Microprocessor inputs
Appliance sensor systems
Industrial controls
ANODE 1
6 BASE
CATHODE 2
5 COL
3
4 EMITTER
Parameters
TOTAL DEVICE
Storage Temperature
Operating Temperature
Lead Solder Temperature
EMITTER
Continuous Reverse Voltage
Continuous Forward Current
Forward Current - Peak (10 µs pulse,
δ
= 0.01)
Total Power Dissipation up to 25°C Ambient
Derate Linearly from 25°C
DETECTOR
Collector to Emitter Voltage (open base)
Collector to Base Voltage (open emitter)
Emitter to Collector Voltage (open base)
DC Collector Current
Detector Power Dissipation up to 25°C Ambient
Derate Linearly from 25°C
Symbol
T
STG
T
OPR
T
SOL
V
R
I
F
I
F
(pk)
P
D
V
CEO
V
CBO
V
ECO
I
C
P
D
Device
All
All
All
All
All
All
All
All
CNX38U
CNX35U, CNX36U, CNX39U
CNX38U
CNX35U, CNX36U, CNX39U
All
All
All
All
Value
-55 to +150
-40 to +100
260 for 10 sec
5
100
3.0
200
2.0
80
30
120
70
7
100
200
2.0
Units
°C
°C
°C
V
mA
A
mW
mW/°C
V
V
V
mA
mW
mW/°C
2001 Fairchild Semiconductor Corporation
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5/23/01
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6-PIN PHOTOTRANSISTOR
OPTOCOUPLERS
CNX35U CNX36U CNX38U
ELECTRICAL CHARACTERISTICS
(T
A
= 25°C Unless otherwise specified.)
CNX39U
INDIVIDUAL COMPONENT CHARACTERISTICS
Parameters
EMITTER
Input Forward Voltage
Reverse Current
DETECTOR
Leakage Current Collector to Emitter
I
F
= 10 mA
V
R
= 5 V
V
CE
= 10 V
V
CE
= 50 V
V
CE
= 10 V, T
A
= 70°C
V
CE
= 50 V, T
A
= 70°C
V
CE
= 10 V
Breakdown Voltage
Collector to Emitter
Collector to Base
Emitter to Collector
I
C
= 1 mA, I
F
= 0
I
C
= 0.1 mA, I
F
= 0
I
E
= 0.1 mA, I
F
= 0
BV
CEO
BV
CBO
BV
ECO
CNX35U,CNX36U,CNX39U
CNX38U
CNX35U,CNX36U,CNX39U
CNX38U
All
30
80
70
120
7
V
V
V
I
CBO
I
CEO
V
F
I
R
All
All
CNX35U,CNX36U,CNX39U
CNX38U
CNX35U,CNX36U,CNX39U
CNX38U
All
2
2
1.15
1.5
10
50
50
10
10
20
V
µA
nA
nA
µA
µA
nA
Test Conditions
Symbol
Device
Min
Typ
Max
Units
ISOLATION CHARACTERISTICS
Characteristic
Input-Output Isolation Voltage
Isolation Resistance
Isolation Capacitance
Test Conditions
t = 1 min.
V
I-O
= 500 VDC
IF =0, V = 0V, f = 1 MHz
Symbol
V
ISO
R
ISO
C
ISO
Min
5,300
1
10
0.6
1.3
Typ
Max
Units
V
RMS
T!
pF
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DS300401
6-PIN PHOTOTRANSISTOR
OPTOCOUPLERS
CNX35U CNX36U CNX38U
TRANSFER CHARACTERISTICS
DC Characteristics
(T
A
= 25°C Unless otherwise specified.)
Symbol
Device
CNX35U
I
F
= 10 mA, V
CE
= 0.4 V
Output/Input Current Transfer Ratio
I
F
= 10 mA, V
CE
= 10 V
I
F
= 16 mA, V
CE
= 0.4 V
I
F
= 2 mA, V
CE
= 5 V
Collector-Emitter Saturation Voltage
AC Characteristics
Non-Saturated Switching Times
Turn-On Time
See Fig. 1 and Fig. 2
R
L
= 100
Ω,
I
C
= 2 mA, V
CC
= 5 V
R
L
= 100
Ω,
I
C
= 4 mA, V
CC
= 5 V
R
L
= 100
Ω,
I
C
= 2 mA, V
CC
= 5 V
R
L
= 100
Ω,
I
C
= 4 mA, V
CC
= 5 V
Saturated Switching Times
Turn-On Time
See Fig. 1 and Fig. 2
R
L
= 1 kΩ, I
C
= 2 mA, V
CC
= 5 V
R
L
= 1 kΩ, I
C
= 4 mA, V
CC
= 5 V
R
L
= 1 kΩ, I
C
= 2 mA, V
CC
= 5 V
R
L
= 1 kΩ, I
C
= 4 mA, V
CC
= 5 V
t
on
t
on
I
F
= 10 mA, I
C
= 2 mA
I
F
= 10 mA, I
C
= 4 mA
I
F
= 16 mA, I
C
= 2 mA
Test Conditions
Symbol
V
CE(SAT)
CTR
CNX39U
CNX36U
CNX38U
All
CNX35U, CNX39U
CNX36U
CNX38U
Device
CNX35U
CNX39U
CNX36U
CNX38U
CNX35U
Turn-Off Time
See Fig. 1 and Fig. 2
t
off
CNX39U
CNX36U
CNX38U
CNX35U
CNX39U
CNX36U
CNX38U
CNX35U
Turn-Off Time
See Fig. 1 and Fig. 2
t
off
CNX39U
CNX36U
CNX38U
Min
Min
40
60
80
70
50
15
0.15
0.19
0.2
Typ
0.4
0.4
0.4
Max
20
20
20
20
20
20
20
20
50
50
50
50
50
50
50
50
µs
µs
µs
µs
V
Units
Typ
Max
160
100
200
210
%
Units
CNX39U
Test Conditions
DS300401
5/23/01
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www.fairchildsemi.com
6-PIN PHOTOTRANSISTOR
OPTOCOUPLERS
CNX35U CNX36U CNX38U
CNX39U
V
I
V
I
+V
CC
0
V
O
90%
V
O
50Ω
R
L
0
t
on
t
off
10%
Fig. 1 Switching Test Circuit
Fig. 2 Switching Test Waveforms
Fig. 3 LED Forward Voltage vs. Forward Current
1.8
Fig. 4 Normalized CTR vs. Forward Current
1.5
V
F
- FORWARD VOLTAGE (V)
V
CE
= 5.0V
1.6
T
A
= 25 C
o
Normalized to
I
F
= 10mA
NORMALIZED CTR
100
1.0
1.4
T
A
= -55
o
C
T
A
= 25
o
C
1.2
T
A
= 100
o
C
0.5
1.0
1
10
0.0
0
5
10
15
20
I
F
- LED FORWARD CURRENT (mA)
FORWARD CURRENT - I
F
(mA)
Fig. 5 Normalized CTR vs. Temperature
I
F
= 10mA
1.0
I
F
= 5mA
I
F
= 20mA
0.8
Fig. 6 CTR vs. RBE (Unsaturated)
NORMALIZED CTR ( CTR
RBE
/ CTR
RBE(OPEN)
)
1.0
0.9
0.8
I
F
= 20mA
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
I
F
= 5mA
I
F
= 10mA
V
CE
= 5.0V
1.2
NORMALIZED CTR
0.6
0.4
Normalized To CTR at:
I
F
=10mA
V
CE
= 5V
T
A
= 25
o
C
0.2
-75
-50
-25
0
25
50
75
100
125
10
100
1000
AMBIENT TEMPERATURE T
A
- (
o
C)
R
BE
- BASE RESISTANCE (k
Ω)
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DS300401
6-PIN PHOTOTRANSISTOR
OPTOCOUPLERS
CNX35U CNX36U CNX38U
Fig. 7 CTR vs. RBE (Saturated)
NORMALIZED CTR ( CTR
RBE
/ CTR
RBE(OPEN)
)
1.0
CNX39U
Fig. 8 Normalized t
on
vs. R
BE
5.0
V
CC
= 10V
I
C
= 2mA
R
L
= 100
Ω
0.8
I
F
= 20mA
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
10
100
I
F
= 5mA
I
F
= 10mA
V
CE
= 0.3V
/ t
on(open)
)
BE
0.9
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
1000
NORMALIZED t
on
- (t
on(R
)
10
100
1000
10000
100000
R
BE
- BASE RESISTANCE (k
Ω)
R
BE
- BASE RESISTANCE (k
Ω)
Fig. 9 Normalized t
off
vs. R
BE
1.4
1.3
1.2
1.1
V
CC
= 10V
I
C
= 2mA
R
L
= 100
Ω
NORMALIZED TO t
off
AT RBE = OPEN
Fig. 10 Switching Speed vs. Load Resistor
1000
V
CC
= 10V
I
C
= 2mA
SWITCHING SPEED - (µs)
100
R
L
= 100Ω
NORMALIZED t
off
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
10
100
1000
10000
T
off
10
T
f
T
on
1
T
r
0.1
0.1
1
10
100
R
BE
- BASE RESISTANCE (k
Ω)
R
L
- LOAD RESISTOR (kΩ)
Fig. 11 Collector-Emitter Saturation Voltage
as a Function of Collector Current
10
1
I
B
= 0; T
A
= 25
o
C
V
CEsat
- (V)
0.1
I
F
= 2.5mA
0.01
I
F
= 5mA
0.001
0.01
0.1
I
F
= 10mA
I
F
= 20mA
1
10
I
C
- (mA)
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