IL256AT
Vishay Semiconductors
Optocoupler, Phototransistor Output,
AC Input, with Base Connection
FEATURES
A/C
C/A
NC
NC
1
2
3
4
8 NC
7 B
6 C
5 E
• Guaranteed CTR symmetry, 2:1 maximum
• Bidirectional AC input industry standard
SOIC-8 Surface mountable package
• Isolation test voltage, 4000 V
RMS
• Standard lead spacing, 0.05"
• Available only on tape and reel (conform to EIA
standard RS481A)
• Lead (Pb)-free component
• Component in accordance to RoHS 2002/95/EC and
WEEE 2002/96/EC
i179025
DESCRIPTION
The IL256AT is an AC input phototransistor optocoupler. The
device consists of two infrared emitters connected in reverse
parallel and coupled to a silicon NPN phototransistor
detector.
These circuit elements are constructed with a standard
SOIC-8 foot print.
The product is well suited for telecom applications such as
ring detection or off/on hook status, given its bidirectional
LED input and guaranteed current transfer ratio (CTR)
minimum of 20 % at I
F
= 10 mA.
APPLICATIONS
• Telecom applications ring detection
AGENCY APPROVALS
• UL1577, file no. E52744 system code Y
• CUL - file no. E52744, equivalent to CSA bulletin 5A
• DIN EN 60747-5-2 (VDE 0884) available with option 1
ORDER INFORMATION
PART
IL256AT
REMARKS
CTR > 20 %, tape and reel, SOIC-8
ABSOLUTE MAXIMUM RATINGS
PARAMETER
INPUT
Forward continuous current
Power dissipation
Derate linearly from 25 °C
OUTPUT
Collector-emitter breakdown voltage
Emitter-collector breakdown voltage
Collector-base breakdown voltage
Power dissipation
Derate linearly from 25 °C
COUPLER
Isolation voltage, input to output
Total package dissipation
(LED and detector)
Derate linearly from 25 °C
Storage temperature
Operating temperature
Soldering time at 260 °C
T
stg
T
amb
V
ISO
P
tot
4000
240
3.2
- 55 to + 150
- 55 to + 100
10
V
RMS
mW
mW/°C
°C
°C
s
BV
CEO
BV
ECO
BV
CBO
P
diss
30
5
70
150
2.0
V
V
V
mW
mW/°C
I
F
P
diss
60
90
0.8
mA
mW
mW/°C
TEST CONDITION
SYMBOL
VALUE
UNIT
Note
T
amb
= 25 °C, unless otherwise specified.
Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. Functional operation of the device is not implied
at these or any other conditions in excess of those given in the operational sections of this document. Exposure to absolute maximum ratings for
extended periods of the time can adversely affect reliability.
Document Number: 83620
Rev. 1.8, 08-Jan-08
For technical questions, contact: optocoupler.answers@vishay.com
www.vishay.com
1
IL256AT
Vishay Semiconductors
Optocoupler, Phototransistor Output,
AC Input, with Base Connection
ELECTRICAL CHARACTERISTICS
PARAMETER
INPUT
Forward voltage
OUTPUT
Collector emitter breakdown voltage
Emitter collector breakdown voltage
Collector base breakdown voltage
Collector emitter leakage current
COUPLER
Saturation voltage, collector emitter
I
F
= 16 mA, I
C
= 2 mA
V
CEsat
0.4
V
Note
T
amb
= 25 °C, unless otherwise specified. Minimum and maximum values are testing requirements. Typical values are characteristics of the
device and are the result of engineering evaluation. Typical values are for information only and are not part of the testing requirements.
I
C
= 1.0 mA
I
E
= 100 µA
I
C
= 100 µA
V
CE
= 10 V
BV
CEO
BV
ECO
BV
CBO
I
CEO
30
5
70
50
10
90
5
50
V
V
V
nA
I
F
= ± 10 mA
V
F
1.2
1.5
V
TEST CONDITION
SYMBOL
MIN.
TYP.
MAX.
UNIT
CURRENT TRANSFER RATIO
PARAMETER
DC current transfer ratio
Symmetry
(CTR at + 10 mA)/(CTR at -10 mA)
TEST CONDITION
I
F
= 10 mA, V
CE
= 5 V
SYMBOL
CTR
DC
MIN.
20
0.5
1
2
TYP.
MAX.
UNIT
%
SAFETY AND INSULATION RATINGS
PARAMETER
Climatic classification
(according to IEC 68 part 1)
Comparative tracking index
V
IOTM
VIORM
PSO
ISI
TSI
Creepage distance
Clearance distance
Insulation thickness, reinforced rated
per IEC 60950 2.10.5.1
4
4
0.2
CTI
175
6000
560
350
150
165
TEST CONDITION
SYMBOL
MIN.
TYP.
55/100/21
399
V
V
mW
mA
°C
mm
mm
mm
MAX.
UNIT
Note
As per IEC 60747-5-2, §7.4.3.8.1, this optocoupler is suitable for “safe electrical insulation” only within the safety ratings. Compliance with the
safety ratings shall be ensured by means of prodective circuits.
www.vishay.com
2
For technical questions, contact: optocoupler.answers@vishay.com
Document Number: 83620
Rev. 1.8, 08-Jan-08
IL256AT
Optocoupler, Phototransistor Output,
Vishay Semiconductors
AC Input, with Base Connection
TYPICAL CHARACTERISTICS
T
amb
= 25 °C, unless otherwise specified
60
I
F
- LED Forward Current (mA)
40
20
0
- 20
- 40
- 60
- 1.5 - 1.0
iil256at_01
2.0
Normalized
to:
I
F
= 10 mA,
V
CE
= 10
V
T
A
= 25 °C
T
A
= 25 °C
T
A
= 50 °C
T
A
= 70 °C
T
A
= 100 °C
85
°C
Normalized
CTR
1.5
25 °C
- 55 °C
1.0
0.5
- 0.5
0.0
0.5
1.0
1.5
0.0
0.1
iil256at_04
V
F
- LED Forward
Voltage
(V)
1
10
I
F
- LED Current (mA)
100
Fig. 1 - LED Forward Current vs.Forward Voltage
Fig. 4 - Normalized CTR vs. I
F
and T
amb
1.4
1.3
T = - 55 °C
A
1.2
1.0
0.8
T
A
= 25 °C
T
A
= 50 °C
T
A
= 70 °C
T
A
= 100 °C
V
CE(sat)
= 0.4
V
V
F
- Forward
Voltage
(V)
Normalized
CTR
1.1
1.0
0.9
0.8
0.7
0.1
1
T
A
= 25 °C
0.6
0.4
0.2
0.0
0.1
T
A
= 100 °C
Normalized
to:
I
F
= 10 mA,
V
CE
= 10
V
T
A
= 25 °C
1
10
100
10
100
iil256at_02
I
F
- Forward Current (mA)
iil256at_05
I
F
- LED Current (mA)
Fig. 2 - Forward Voltage vs. Forward Current
Fig. 5 - Normalized Saturated CTR
10000
If(pk) - Peak LED Current (mA)
Duty Factor
τ
1.5
Normalized
to:
I
F
= 10 mA
Normalized
CTR
CB
t
DF =
τ
/t
1.0
1000
0.005
0.01
0.02
0.05
0.1
0.2
0.5
100
0.5
T
A
= 25 °C
T
A
= 50 °C
T
A
= 70 °C
10
10
- 6
10
- 5
10
- 4
10
- 3
10
- 2
10
- 1
10
0
10
1
0.0
0.1
iil256at_06
1
10
100
iil256at_03
t - LED Pulse Duration (s)
I
F
- LED Current (mA)
Fig. 3 - Peak LED Current vs. Duty Factor, Tau
Fig. 6 - Normalized CTR
cb
Document Number: 83620
Rev. 1.8, 08-Jan-08
For technical questions, contact: optocoupler.answers@vishay.com
www.vishay.com
3
IL256AT
Vishay Semiconductors
Optocoupler, Phototransistor Output,
AC Input, with Base Connection
1000
1.5
25 °C
Normalized
to:
HFE at
V
CE
= 10
V
I
CB
= 10
µA
1.0
T
A
T
A
T
A
T
A
= - 20 °C
= 25 °C
= 50 °C
= 70 °C
I
CB
- Photocurrent (µA)
100
70 °C
10
Normalized
Saturated HF
0.5
1
V
CE(sat)
= 0.4
V
0.1
0.1
iil256at_07
0.0
1
10
100
iil256at_10
1
10
100
1000
I
F
- LED Current (mA)
I
B
- Base Current (µA)
Fig. 7 - Photocurrent vs. LED Current
Fig. 10 - Normalized Saturated h
FE
vs. Base Current
700
V
CE
= 0.4
V
600
100
1000
100
HFE - Transistor Gain
I
F
- LED Current (mA)
I
B
- Base Current (µA)
500
400
300
200
100
1
10
10
1
0.1
0.01
1
iil256at_08
I
B
10
100
- Base Current (µA)
0.1
1000
0.001
0.4
iil256at_11
0.5
0.6
0.7
0.8
V
BE
- Base Emitter
Voltage
(V)
Fig. 8 - Base Current vs. I
F
and h
FE
Fig. 11 - Base Emitter Voltage vs. Base Current
1.2
Normalized
to:
I
B
= 10
µA
V
CE
= 10
NHFE
- 20 °C
NHFE
25 °C
NHFE
50 °C
NHFE
70 °C
10
5
10
4
1.0
Normalized
HFE
I
CEO
- Collector Emitter (nA)
10
3
10
2
10
1
10
0
10
-1
10
-2
- 20
0
20
40
60
80
100
T
A
- Ambient Temperature (°C)
V
CE
= 10
V
0.8
Typical
0.6
0.4
1
iil256at_09
10
100
1000
iil256at_12
I
B
- Base Current (µA)
Fig. 9 - Normalized h
FE
vs. Base Current and Temp.
Fig. 12 - Collector-Emitter Leakage Current vs.Temp.
www.vishay.com
4
For technical questions, contact: optocoupler.answers@vishay.com
Document Number: 83620
Rev. 1.8, 08-Jan-08
IL256AT
Optocoupler, Phototransistor Output,
Vishay Semiconductors
AC Input, with Base Connection
PACKAGE DIMENSIONS
in inches (millimeters)
0.120 ± 0.002
(3.05 ± 0.05)
R 0.010 (0.13)
0.050 (1.27)
0.240
(6.10)
C
L
0.154 ± 0.002
(3.91 ± 0.05)
0.014 (0.36)
0.036 (0.91)
0.170 (4.32)
0.260 (6.6)
0.045 (1.14)
Pin one I.D.
0.230 ± 0.002
(5.84 ± 0.05)
ISO method A
0.004 (0.10)
0.008 (0.20)
0.016 (0.41)
7°
0.015 ± 0.002
(0.38 ± 0.05)
40 °
0.0585 ± 0.002
(1.49 ± 0.05)
0.125 ± 0.002
0.008 (0.20)
5° max.
R0.010
0.020 ± 0.004
(0.51 ± 0.10)
2 plcs.
(0.25) max.
Lead coplanarity
± 0.001 max.
(3.18 ± 0.05)
0.050 (1.27) typ.
0.040 (1.02)
i178020
Document Number: 83620
Rev. 1.8, 08-Jan-08
For technical questions, contact: optocoupler.answers@vishay.com
www.vishay.com
5
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