6
1
6
1
6
1
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).
CNX35U CNX36U CNX38U CNX39U
APPLICATIONS
• Power supply regulators
• Digital logic inputs
• Microprocessor inputs
• Appliance sensor systems
• Industrial controls
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)
1
2
6
5 COL
4 EMITTER
BASE
ANODE
CATHODE
3
SCHEMATIC
Parameters Symbol Device Value Units
TOTAL DEVICE TSTG All -55 to +150 °C
Storage Temperature
Operating Temperature TOPR All -40 to +100 °C
Lead Solder Temperature TSOL All 260 for 10 sec °C
EMITTER
Continuous Reverse Voltage VRAll 5 V
Continuous Forward Current IFAll 100 mA
Forward Current - Peak (10 µs pulse, δ= 0.01) IF(pk) All 3.0 A
Total Power Dissipation up to 25°C Ambient PDAll 200 mW
Derate Linearly from 25°C All 2.0 mW/°C
DETECTOR CNX38U 80
Collector to Emitter Voltage (open base) VCEO CNX35U, CNX36U, CNX39U 30 V
CNX38U 120
Collector to Base Voltage (open emitter) VCBO CNX35U, CNX36U, CNX39U 70 V
Emitter to Collector Voltage (open base) VECO All 7 V
DC Collector Current ICAll 100 mA
Detector Power Dissipation up to 25°C Ambient PDAll 200 mW
Derate Linearly from 25°C All 2.0 mW/°C
2001 Fairchild Semiconductor Corporation
DS300401 5/23/01 1 OF 8 www.fairchildsemi.com
6-PIN PHOTOTRANSISTOR
OPTOCOUPLERS
Parameters Test Conditions Symbol Device Min Typ Max Units
EMITTER
Input Forward Voltage IF= 10 mA VFAll 1.15 1.5 V
Reverse Current VR= 5 V IRAll 10 µA
DETECTOR VCE = 10 V CNX35U, CNX36U,CNX39U 250nA
VCE = 50 V ICEO CNX38U 2 50 nA
Leakage Current Collector to Emitter VCE = 10 V, TA= 70°C CNX35U, CNX36U,CNX39U 10 µA
VCE = 50 V, TA= 70°C CNX38U 10 µA
VCE = 10 V ICBO All 20 nA
Breakdown Voltage
Collector to Emitter IC= 1 mA, IF= 0 BVCEO CNX35U, CNX36U,CNX39U 30 V
CNX38U 80
Collector to Base IC= 0.1 mA, IF= 0 BVCBO CNX35U, CNX36U,CNX39U 70 V
CNX38U 120
Emitter to Collector IE= 0.1 mA, IF= 0 BVECO All 7 V
INDIVIDUAL COMPONENT CHARACTERISTICS
ELECTRICAL CHARACTERISTICS (TA= 25°C Unless otherwise specified.)
www.fairchildsemi.com 2 OF 8 5/23/01 DS300401
Characteristic Test Conditions Symbol Min Typ Max Units
Input-Output Isolation Voltage t = 1 min. VISO 5,300 VRMS
Isolation Resistance VI-O = 500 VDC RISO 110 T!
Isolation Capacitance IF =0, V = 0V, f = 1 MHz CISO 0.6 1.3 pF
ISOLATION CHARACTERISTICS
6-PIN PHOTOTRANSISTOR
OPTOCOUPLERS
CNX35U CNX36U CNX38U CNX39U
DC Characteristics Test Conditions Symbol Device Min Typ Max Units
CNX35U 40 160
IF= 10 mA, VCE = 0.4 V CNX39U 60 100
Output/Input Current Transfer Ratio CNX36U 80 200
IF= 10 mA, VCE = 10 V CTR CNX38U 70 210 %
IF= 16 mA, VCE = 0.4 V 50
IF= 2 mA, VCE = 5 V All 15
IF= 10 mA, IC = 2 mA CNX35U, CNX39U 0.15 0.4
Collector-Emitter Saturation Voltage IF= 10 mA, IC = 4 mA VCE(SAT) CNX36U 0.19 0.4 V
IF= 16 mA, IC = 2 mA CNX38U 0. 2 0 .4
AC Characteristics Test Conditions Symbol Device Min Typ Max Units
Non-Saturated Switching Times CNX35U 20
Turn-On Time RL= 100 , IC= 2 mA, VCC = 5 V ton CNX39U 20 µs
See Fig. 1 and Fig. 2 CNX36U 20
RL= 100 , IC= 4 mA, VCC = 5 V CNX38U 20
CNX35U 20
Turn-Off Time RL= 100 , IC= 2 mA, VCC = 5 V toff CNX39U 20 µs
See Fig. 1 and Fig. 2 CNX36U 20
RL= 100 , IC= 4 mA, VCC = 5 V CNX38U 20
Saturated Switching Times CNX35U 50
Turn-On Time RL= 1 k, IC= 2 mA, VCC = 5 V ton CNX39U 50 µs
See Fig. 1 and Fig. 2 CNX36U 50
RL= 1 k, IC= 4 mA, VCC = 5 V CNX38U 50
CNX35U 50
Turn-Off Time RL= 1 k, IC= 2 mA, VCC = 5 V toff CNX39U 50 µs
See Fig. 1 and Fig. 2 CNX36U 50
RL= 1 k, IC= 4 mA, VCC = 5 V CNX38U 50
TRANSFER CHARACTERISTICS (TA= 25°C Unless otherwise specified.)
DS300401 5/23/01 3 OF 8 www.fairchildsemi.com
6-PIN PHOTOTRANSISTOR
OPTOCOUPLERS
CNX35U CNX36U CNX38U CNX39U
VI
0
0
ton
toff
10%
90%
Fig. 2 Switching Test Waveforms
+VCC
VO
VI
RL
50
Fig. 1 Switching Test Circuit
VO
Fig. 3 LED Forward Voltage vs. Forward Current
Fig. 5 Normalized CTR vs. Temperature Fig. 6 CTR vs. RBE (Unsaturated)
Fig. 4 Normalized CTR vs. Forward Current
IF - LED FORWARD CURRENT (mA)
1 10 100
V
F
- FORWARD VOLTAGE (V)
1.0
1.2
1.4
1.6
1.8
TA = -55oC
TA = 25oC
TA = 100oC
FORWARD CURRENT - IF (mA)
0 5 10 15 20
NORMALIZED CTR
0.0
0.5
1.0
1.5
Normalized to
IF = 10mA
VCE = 5.0V
TA = 25 oC
AMBIENT TEMPERATURE T A - (oC)
-75 -50 -25 0 25 50 75 100 125
NORMALIZED CTR
0.2
0.4
0.6
0.8
1.0
1.2
Normalized To CTR at:
IF =10mA
VCE = 5V
TA = 25oC
IF = 10mA
IF = 5mA
IF = 20mA
RBE - BASE RESISTANCE (kΩ)
10 100 1000
NORMALIZED CTR ( CTR
RBE
/ CTR
RBE(OPEN)
)
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
VCE = 5.0V
IF = 20mA
IF = 10mA
IF = 5mA
www.fairchildsemi.com 4 OF 8 5/23/01 DS300401
6-PIN PHOTOTRANSISTOR
OPTOCOUPLERS
CNX35U CNX36U CNX38U CNX39U
Fig. 7 CTR vs. RBE (Saturated) Fig. 8 Normalized ton vs. RBE
Fig. 9 Normalized toff vs. RBE Fig. 10 Switching Speed vs. Load Resistor
RBE - BASE RESISTANCE (kΩ)
10 100 1000
NORMALIZED CTR ( CTR
RBE
/ CTR
RBE(OPEN)
)
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
IF = 20mA
IF = 10mA
IF = 5mA
VCE = 0.3V
RBE - BASE RESISTANCE (k)
10 100 1000 10000 100000
NORMALIZED ton - (ton(R
BE
) / ton(open) )
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
VCC = 10V
IC = 2mA
RL = 100
RBE - BASE RESISTANCE (k)
10 100 1000 10000
NORMALIZED t
off
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
VCC = 10V
IC = 2mA
RL = 100
NORMALIZED TO toff AT RBE = OPEN
RL - LOAD RESISTOR (k)
0.1 1 10 100
SWITCHING SPEED - (µs)
0.1
1
10
100
1000
VCC = 10V
IC = 2mA
RL = 100
Toff
Tf
Ton
Tr
Fig. 11 Collector-Emitter Saturation Voltage
as a Function of Collector Current
IC - (mA)
0.01 0.1 1 10
V
CEsat
- (V)
0.001
0.01
0.1
1
10
IB = 0; TA = 25oC
IF = 2.5mA
IF = 10mA
IF = 5mA IF = 20mA
DS300401 5/23/01 5 OF 8 www.fairchildsemi.com
6-PIN PHOTOTRANSISTOR
OPTOCOUPLERS
CNX35U CNX36U CNX38U CNX39U
NOTE
All dimensions are in inches (millimeters)
Lead Coplanarity : 0.004 (0.10) MAX
0.270 (6.86)
0.240 (6.10)
0.350 (8.89)
0.330 (8.38)
0.300 (7.62)
TYP
0.405 (10.30)
MAX
0.315 (8.00)
MIN
0.016 (0.40) MI N
2
5
PIN 1
ID.
0.016 (0.41)
0.008 (0.20)
0.100 (2.54)
TYP
0.022 (0.56)
0.016 (0.41)
0.070 (1.78)
0.045 (1.14)
0.200 (5.08)
0.165 (4.18)
4
3
0.020 (0.51)
MIN
1
6
0.100 (2.54)
TYP
0.020 (0.51)
MIN
0.350 (8.89)
0.330 (8.38)
0.270 (6.86)
0.240 (6.10)
PIN 1
ID.
0.022 (0.56)
0.016 (0.41)
0.070 (1.78)
0.045 (1.14)
0.200 (5.08)
0.135 (3.43)
0.300 (7.62)
TYP
0° to 15°
0.154 (3.90)
0.100 (2.54)
SEATING PLANE
0.016 (0.40)
0.008 (0.20)
SEATING PLANE
0.016 (0.40)
0.008 (0.20)
0.070 (1.78)
0.045 (1.14)
0.350 (8.89)
0.330 (8.38)
0.154 (3.90)
0.100 (2.54)
0.200 (5.08)
0.135 (3.43)
0.004 (0.10)
MIN
0.270 (6.86)
0.240 (6.10)
0.400 (10.16)
TYP
0° to 15°
0.022 (0.56)
0.016 (0.41) 0.100 (2.54) TYP
0.070 (1.78)
0.060 (1.52)
0.030 (0.76)
0.100 (2.54)
0.295 (7.49)
0.415 (10.54)
Packa ge Dimensions (Surface Mount)Packa ge Dimensions (Thr ough Hole)
Packa ge Dimensions (0.4”Lead Spacing) Recommended Pad Layout for
Surface Mount Leadform
6-PIN PHOTOTRANSISTOR
OPTOCOUPLERS
www.fairchildsemi.com 6 OF 8 5/23/01 DS300401
CNX35U CNX36U CNX38U CNX39U
NOTE
All dimensions are in inches (millimeters)
6-PIN PHOTOTRANSISTOR
OPTOCOUPLERS
DS300401 5/23/01 7 OF 8 www.fairchildsemi.com
S .S Surface Mount Lead Bend
SD .SD Surface Mount; Tape and reel
W .W 0.4” Lead Spacing
300 .300 VDE 0884
300W .300W VDE 0884, 0.4” Lead Spacing
3S .3S VDE 0884, Surface Mount
3SD .3SD VDE 0884, Surface Mount, Tape & Reel
Option Order Entry Identifier Description
4.0 ± 0.1
Ø1.55 ± 0.05
User Direction of Feed
4.0 ± 0.1
1.75 ± 0.10
7.5 ± 0.1
16.0 ± 0.3
12.0 ± 0.1
0.30 ± 0.05
13.2 ± 0.2
4.85 ± 0.20
0.1 MAX 10.30 ± 0.20
9.55 ± 0.20
Ø1.6 ± 0.1
Carrier Tape Specifications (“D” Taping Orientation)
ORDERING INFORMATION CNX35U CNX36U CNX38U CNX39U
MARKING INFORMATION
Reflow Profile (Black Package, No Suffix)
CNX35U
V XX YY K
1
2
6
43 5
Definitions
1 Fairchild logo
2 Device number
3VDE mark (Note: Only appears on parts ordered with VDE
option – See order entry table)
4 Two digit year code, e.g., ‘03’
5 Two digit work week ranging from ‘01’ to ‘53’
6 Assembly package code
Peak reflow temperature: 225° C (package surface temperature)
Time of temperature higher than 183° C for 60150 seconds
One time soldering reflow is recommended
215°C, 1030 s
225 C peak
Time (Minute)
0
300
250
200
150
100
50
0
0.5 1 1.5 2 2.5 3 3.5 4 4.5
Temperature (°C)
Time above 183° C, 60150 sec
Ramp up = 3 C/sec
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY
PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY
ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT
CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.
TRADEMARKS
The following are registered and unregistered trademarks Fairchild Semiconductor owns or is authorized to use and is
not intended to be an exhaustive list of all such trademarks.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF FAIRCHILD SEMICONDUCTOR CORPORATION.
As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant into
the body, or (b) support or sustain life, or (c) whose
failure to perform when properly used in accordance
with instructions for use provided in the labeling, can be
reasonably expected to result in significant injury to the
user.
2. A critical component is any component of a life
support device or system whose failure to perform can
be reasonably expected to cause the failure of the life
support device or system, or to affect its safety or
effectiveness.
PRODUCT STATUS DEFINITIONS
Definition of Terms
Datasheet Identification Product Status Definition
Advance Information
Preliminary
No Identification Needed
Obsolete
This datasheet contains the design specifications for
product development. Specifications may change in
any manner without notice.
This datasheet contains preliminary data, and
supplementary data will be published at a later date.
Fairchild Semiconductor reserves the right to make
changes at any time without notice in order to improve
design.
This datasheet contains final specifications. Fairchild
Semiconductor reserves the right to make changes at
any time without notice in order to improve design.
This datasheet contains specifications on a product
that has been discontinued by Fairchild semiconductor.
The datasheet is printed for reference information only.
Formative or
In Design
First Production
Full Production
Not In Production
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