
4N32X3,-2,-1 
4N32-3,-2,-1
LOW INPUT CURRENT
PHOTODARLINGTON OPTICALL Y
COUPLED ISOLAT OR S
APPROVALS
l UL recognised, File No. E91231
'X' SPECIFICATION APPROVALS
l VDE 0884 in 2 available lead form : -
 - STD
 - G form
VDE 0884 in SMD approval pending
  l EN60950 approved by SETI,
reg. no. 157786-18
DESCRIPTION
The 4N32-3,-2,-1 series of optically coupled 
isolators consist of an infrared light emitting 
diode and NPN silicon photodarlington in a 
space efficient dual in line plastic package.
FEATURES
l Options :-
10mm lead spread - add G after part no. 
Surface mount - add SM after part no. 
Tape&reel - add SMT&R after part no.
l Low input current 0.25mA I
l High CurrentTransfer Ratio (200% min)
l High Isolation Voltage (5.3kV
l High BV
l All electrical parameters 100% tested
l Custom electrical selections available
 (55V min)
CEO
F
RMS 
,7.5kV
PK 
2.54
6.4
6.2
1.54
8.8
8.4
4.3
Dimensions in mm
1 
2
3
7.8
7.4
4.1
0.5
0.5
0.3
3.3
9.6
8.4
ABSOLUTE MAXIMUM RATINGS 
(25°C unless otherwise specified)
Storage Temperature -55°C to + 150°C 
Operating Temperature -55°C to + 100°C 
Lead Soldering Temperature 
(1/16 inch (1.6mm) from case for 10 secs) 260°C
)
INPUT DIODE
Forward Current 80mA 
Reverse Voltage 10V 
Power Dissipation 105mW
6 
5
4
APPLICATIONS
l Computer terminals
l Industrial systems controllers
l Measuring instruments
l Signal transmission between systems of
different potentials and impedances
OPTION SM
SURFACE MOUNT
1.2
0.6
10.2
 9.5
 1.4
 0.9
OPTION G
0.26
10.16
ISOCOM COMPONENTS LTD
Unit 25B, Park View Road West,
Park View Industrial Estate, Brenda Road
Hartlepool, Cleveland, TS25 1YD
Tel: (01429) 863609 Fax :(01429) 863581
30/7/97
 5.08 
max.
OUTPUT TRANSISTOR
Collector-emitter Voltage BV 
Emitter-collector Voltage BV 
Power Dissipation 150mW
CEO 
ECO
55V 
6V
POWER DISSIPATION
Total Power Dissipation 250mW 
(derate linearly 3.3mW/°C above 25°C)
ISOCOM INC
720 E., Park Boulevard, Suite 104,
Plano, TX 75074 USA
Tel: (972) 423-5521
Fax: (972) 422-4549
DB91023-AAS/A3

ELECTRICAL CHARACTERISTICS ( TA = 25°C Unless otherwise noted )
PARAMETER MIN TYP MAX UNITS   TEST CONDITION
Input Forward Voltage (VF) 1.2 1.4 V IF = 20mA
Reverse Voltage (VR)10VI 
Reverse Current (IR)10µAV
 = 10µA
R
 = 10V
R
Output Collector-emitter Breakdown (BV
Collector-base Breakdown (BV 
Emitter-collector Breakdown (BV
Collector-emitter Dark Current (I
)55 V IC = 1mA (note 2)
CEO
)55 V I
CBO
) 6 V IE = 100µA
ECO
) 100 nA VCE = 10V
CEO
Coupled Current Transfer Ratio (CTR) (Note 2)
4N32-3 200 % 0.25mA IF , 1.0V V
400 % 0.5mA IF , 1.0V V 
800 % 1.0mA IF , 1.0V V
4N32-2 400 % 0.5mA IF , 1.0V V
800 % 1.0mA IF , 1.0V V
4N32-1 800 % 1.0mA IF , 1.0V V
Collector-emitter Saturation Voltage -3 1.0 V 0.25mA IF , 0.5mA I
  -2 1.0 V 0.5mA IF , 2mA I
  -1 1.0 V 1.0mA IF , 8mA I
Input to Output Isolation Voltage V
Input-output Isolation Resistance R
5300 V
ISO
7500 V
10
 5x10
ISO
RMS 
PK
Ω V 
Output Rise Time tr 60 300 µsV 
Output Fall Time tf 53 250 µsI
Note 1 Measured with input leads shorted together and output leads shorted together. 
Note 2 Special Selections are available on request. Please consult the factory.
 = 100µA
C
(note 1) 
(note 1)
= 500V (note 1)
IO 
 = 2V ,
CE
 = 10mA, RL= 100Ω
C
CE
CE
.
CE
CE
.
CE
.
CE
C
C 
C
30/7/97
DB91023-AAS/A3

Collector Power Dissipation vs. Ambient Temperature
200
 (mW)
C
150
(mA)
C 
10
Collector Current vs.
Collector-emitter Voltage
 IF = 1.0mA
8
TA = 25°C
100
50
Collector power dissipation P
0
-30   0    25    50    75    100  125 
Ambient temperature TA ( °C )
Forward Current vs. Ambient Temperature
100
80
 (mA)
F
60
40
6
4
Collector current I
2
 0
0      1      2      3      4     5
Collector-emitter voltage VCE ( V )
Relative Current Transfer Ratio
vs. Ambient Temperature
1.5
1.0
 IF = 0.5mA
 IF = 0.25mA
 IF = 1mA 
VCE = 1V
Forward current I
20
0
-30   0    25    50    75    100  125 
Ambient temperature TA ( °C )
Collector-emitter Saturation
 (V)
CE(SAT)
1.2
Voltage vs. Ambient Temperature
IF = 1mA
1.0
IC = 8mA
0.8
0.6
0.4
0.2 
 0
Collector-emitter saturation voltage V
-30     0     25     50     75    100 
Ambient temperature TA ( °C )
0.5
Relative current transfer ratio
0
-30     0     25     50     75    100 
Ambient temperature TA ( °C )
Current Transfer Ratio vs. Forward Current
1200 
1000
800
600
400
VCE = 1V
200
Current transfer ratio CTR (%)
TA = 25 °C
 0
0.1   0.2      0.5    1     2      5 
Forward current IF (mA)
30/7/97
DB91023-AAS/A3