Document Number: 83620 For technical questions, contact: optocoupler.answers@vishay.com www.vishay.com
Rev. 1.8, 08-Jan-08 1
Optocoupler, Phototransistor Output,
AC Input, with Base Connection
IL256AT
Vishay Semiconductors
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 IF = 10 mA.
FEATURES
• Guaranteed CTR symmetry, 2:1 maximum
• Bidirectional AC input industry standard
SOIC-8 Surface mountable package
• Isolation test voltage, 4000 VRMS
• 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
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
Note
Tamb = 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.
i179025
A/C NC
B
C
E
1
2
3
4
8
7
6
5
NC
NC
C/A
ORDER INFORMATION
PART REMARKS
IL256AT CTR > 20 %, tape and reel, SOIC-8
ABSOLUTE MAXIMUM RATINGS
PARAMETER TEST CONDITION SYMBOL VALUE UNIT
INPUT
Forward continuous current IF60 mA
Power dissipation Pdiss 90 mW
Derate linearly from 25 °C 0.8 mW/°C
OUTPUT
Collector-emitter breakdown voltage BVCEO 30 V
Emitter-collector breakdown voltage BVECO 5V
Collector-base breakdown voltage BVCBO 70 V
Power dissipation Pdiss 150 mW
Derate linearly from 25 °C 2.0 mW/°C
COUPLER
Isolation voltage, input to output VISO 4000 VRMS
Total package dissipation
(LED and detector) Ptot 240 mW
Derate linearly from 25 °C 3.2 mW/°C
Storage temperature Tstg - 55 to + 150 °C
Operating temperature Tamb - 55 to + 100 °C
Soldering time at 260 °C 10 s
www.vishay.com For technical questions, contact: optocoupler.answers@vishay.com Document Number: 83620
2Rev. 1.8, 08-Jan-08
IL256AT
Vishay Semiconductors Optocoupler, Phototransistor Output,
AC Input, with Base Connection
Note
Tamb = 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.
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.
ELECTRICAL CHARACTERISTICS
PARAMETER TEST CONDITION SYMBOL MIN. TYP. MAX. UNIT
INPUT
Forward voltage IF = ± 10 mA VF1.2 1.5 V
OUTPUT
Collector emitter breakdown voltage IC = 1.0 mA BVCEO 30 50 V
Emitter collector breakdown voltage IE = 100 µA BVECO 510 V
Collector base breakdown voltage IC = 100 µA BVCBO 70 90 V
Collector emitter leakage current VCE = 10 V ICEO 550nA
COUPLER
Saturation voltage, collector emitter IF = 16 mA, IC = 2 mA VCEsat 0.4 V
CURRENT TRANSFER RATIO
PARAMETER TEST CONDITION SYMBOL MIN. TYP. MAX. UNIT
DC current transfer ratio IF = 10 mA, VCE = 5 V CTRDC 20 %
Symmetry
(CTR at + 10 mA)/(CTR at -10 mA) 0.5 1 2
SAFETY AND INSULATION RATINGS
PARAMETER TEST CONDITION SYMBOL MIN. TYP. MAX. UNIT
Climatic classification
(according to IEC 68 part 1) 55/100/21
Comparative tracking index CTI 175 399
VIOTM 6000 V
VIORM 560 V
PSO 350 mW
ISI 150 mA
TSI 165 °C
Creepage distance 4mm
Clearance distance 4mm
Insulation thickness, reinforced rated per IEC 60950 2.10.5.1 0.2 mm
Document Number: 83620 For technical questions, contact: optocoupler.answers@vishay.com www.vishay.com
Rev. 1.8, 08-Jan-08 3
IL256AT
Optocoupler, Phototransistor Output,
AC Input, with Base Connection Vishay Semiconductors
TYPICAL CHARACTERISTICS
Tamb = 25 °C, unless otherwise specified
Fig. 1 - LED Forward Current vs.Forward Voltage
Fig. 2 - Forward Voltage vs. Forward Current
Fig. 3 - Peak LED Current vs. Duty Factor, Tau
Fig. 4 - Normalized CTR vs. IF and Tamb
Fig. 5 - Normalized Saturated CTR
Fig. 6 - Normalized CTRcb
iil256at_01
- 1.5 - 1.0 - 0.5 0.0 0.5 1.0 1.5
60
40
20
0
- 20
- 40
- 60
- 55 °C
VF- LED Forward Voltage (V)
I
F
- LED Forward Current (mA)
85 °C
25 °C
iil256at_02
10 100
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
I
F
- Forward Current (mA)
V
F
- Forward Voltage (V)
T
A
= - 55 °C
T
A
= 100 °C
T
A
= 25 °C
0.1 1
iil256at_03
10- 6 10- 5 10- 4 10 - 3 10- 2 10- 1 100101
10000
1000
100
10
t - LED Pulse Duration (s)
If(pk) - Peak LED Current (mA)
0.005
0.05
0.02
0.01
0.1
0.2
0.5
Duty Factor
t
DF = /t
τ
τ
iil256at_04
10 100
2.0
1.5
1.0
0.5
0.0
I
F
- LED Current (mA)
Normalized CTR
T
A
= 25 °C
T
A
= 50 °C
T
A
= 70 °C
T
A
= 100 °C
Normalized to:
I
F
= 10 mA, V
CE
= 10 V
T
A
= 25 °C
1
0.1
iil256at_05
10 100
1.0
0.8
0.6
0.4
0.2
0.0
I
F
- LED Current (mA)
Normalized CTR
Normalized to:
I
F
= 10 mA, V
CE
= 10 V
T
A
= 25 °C
V
CE(sat)
= 0.4 V
T
A
= 25 °C
T
A
= 50 °C
T
A
= 70 °C
T
A
= 100 °C
0.1 1
iil256at_06
10
100
1.5
1.0
0.5
0.0
T
A
= 25 °C
T
A
= 50 °C
T
A
= 70 °C
I
F
- LED Current (mA)
Normalized CTR
CB
Normalized to:
I
F
= 10 mA
0.1 101
www.vishay.com For technical questions, contact: optocoupler.answers@vishay.com Document Number: 83620
4Rev. 1.8, 08-Jan-08
IL256AT
Vishay Semiconductors Optocoupler, Phototransistor Output,
AC Input, with Base Connection
Fig. 7 - Photocurrent vs. LED Current
Fig. 8 - Base Current vs. IF and hFE
Fig. 9 - Normalized hFE vs. Base Current and Temp.
Fig. 10 - Normalized Saturated hFE vs. Base Current
Fig. 11 - Base Emitter Voltage vs. Base Current
Fig. 12 - Collector-Emitter Leakage Current vs.Temp.
iil256at_07
0.1 10 100
1000
100
10
1
0.1
25 °C
70 °C
I
F
- LED Current (mA)
I
CB
- Photocurrent (µA)
1
iil256at_08
1 10 100 1000
700
600
500
400
300
200
100
100
10
1
0.1
I
B
- Base Current (µA)
HFE - Transistor Gain
I
F
- LED Current (mA)
V
CE
= 0.4 V
iil256at_09
1 10 100 1000
1.2
1.0
0.8
0.6
0.4
NHFE - 20 °C
NHFE 25 °C
NHFE 50 °C
NHFE 70 °C
IB- Base Current (µA)
Normalized HFE
Normalized to:
IB= 10 µA
VCE = 10
iil256at_10
1 10 100 1000
1.5
1.0
0.5
0.0
T
A
= - 20 °C
T
A
= 25 °C
T
A
= 50 °C
T
A
= 70 °C
I
B
- Base Current (µA)
Normalized Saturated HF
Normalized to:
HFE at V
CE
= 10 V
I
CB
= 10 µA
V
CE(sat)
= 0.4 V
iil256at_11
0.4 0.5 0.6 0.7 0.8
1000
100
10
1
0.1
0.01
0.001
VBE - Base Emitter Voltage (V)
IB- Base Current (µA)
iil256at_12
- 20 0 20 40 60 80 100
10
5
10
4
10
3
10
2
10
1
10
0
10
-1
10
-2
T
A
- Ambient Temperature (°C)
I
CEO
- Collector Emitter (nA)
Typical
VCE = 10 V
Document Number: 83620 For technical questions, contact: optocoupler.answers@vishay.com www.vishay.com
Rev. 1.8, 08-Jan-08 5
IL256AT
Optocoupler, Phototransistor Output,
AC Input, with Base Connection Vishay Semiconductors
PACKAGE DIMENSIONS in inches (millimeters)
0.036 (0.91)
0.014 (0.36)
0.170 (4.32) 0.045 (1.14)
0.260 (6.6)
R 0.010 (0.13)
0.050 (1.27)
i178020
ISO method A
40 °
0.240
(6.10)
0.050 (1.27) typ.
0.016 (0.41)
0.004 (0.10)
0.008(0.20)
Lead coplanarity
± 0.001 max.
0.008(0.20)
7°
0.120 ± 0.002
(3.05 ± 0.05)
C
L
R0.010
(0.25) max.
0.040 (1.02)
5° max.
Pin one I.D.
0.154 ± 0.002
(3.91 ± 0.05)
0.015 ± 0.002
(0.38 ± 0.05)
0.230 ± 0.002
(5.84 ± 0.05)
0.020 ± 0.004
(0.51 ± 0.10)
2 plcs.
0.0585 ± 0.002
(1.49 ± 0.05)
0.125 ± 0.002
(3.18 ± 0.05)
www.vishay.com For technical questions, contact: optocoupler.answers@vishay.com Document Number: 83620
6Rev. 1.8, 08-Jan-08
IL256AT
Vishay Semiconductors Optocoupler, Phototransistor Output,
AC Input, with Base Connection
OZONE DEPLETING SUBSTANCES POLICY STATEMENT
It is the policy of Vishay Semiconductor GmbH to
1. Meet all present and future national and international statutory requirements.
2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems with
respect to their impact on the health and safety of our employees and the public, as well as their impact on the environment.
It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as ozone
depleting substances (ODSs).
The Montreal Protocol (1987) and its London Amendments (1990) intend to severely restrict the use of ODSs and forbid their use
within the next ten years. Various national and international initiatives are pressing for an earlier ban on these substances.
Vishay Semiconductor GmbH has been able to use its policy of continuous improvements to eliminate the use of ODSs listed in
the following documents.
1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively.
2. Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental Protection Agency
(EPA) in the USA.
3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C (transitional substances) respectively.
Vishay Semiconductor GmbH can certify that our semiconductors are not manufactured with ozone depleting substances and do
not contain such substances.
We reserve the right to make changes to improve technical design
and may do so without further notice.
Parameters can vary in different applications. All operating parameters must be validated for each customer application by the
customer. Should the buyer use Vishay Semiconductors products for any unintended or unauthorized application, the buyer shall
indemnify Vishay Semiconductors against all claims, costs, damages, and expenses, arising out of, directly or indirectly, any
claim of personal damage, injury or death associated with such unintended or unauthorized use.
Vishay Semiconductor GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany
Document Number: 91000 www.vishay.com
Revision: 18-Jul-08 1
Disclaimer
Legal Disclaimer Notice
Vishay
All product specifications and data are subject to change without notice.
Vishay Intertechnology, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf
(collectively, “Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained herein
or in any other disclosure relating to any product.
Vishay disclaims any and all liability arising out of the use or application of any product described herein or of any
information provided herein to the maximum extent permitted by law. The product specifications do not expand or
otherwise modify Vishay’s terms and conditions of purchase, including but not limited to the warranty expressed
therein, which apply to these products.
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this
document or by any conduct of Vishay.
The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications unless
otherwise expressly indicated. Customers using or selling Vishay products not expressly indicated for use in such
applications do so entirely at their own risk and agree to fully indemnify Vishay for any damages arising or resulting
from such use or sale. Please contact authorized Vishay personnel to obtain written terms and conditions regarding
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