LH1549AB/AAC/AACTR
Vishay Semiconductors
1 Form A Phototransistor Telecomswitch
Features
• Solid State Relay
- 1 Form A (LH1525 Type)
- Current-limit Protection
- Clean, Bounce-free Switching
- Low Power Consumption
• Solid State Relay and an Autopolarity
Optocoupler in a Single Package
• Optocoupler
- Bidirectional Current Detection
• Surface Mountable
• I/O Isolation Voltage, 5300 V
RMS
• Lead (Pb)-free component
• Component in accordance to RoHS 2002/95/EC
and WEEE 2002/96/EC
DIP
SMD
S
8
S1
S'
S'
7
6
5
1
i179049
2
3
4
Description
A Telecom Switch consists of an optically isolated,
SPST solid-state relay (SSR) and a bidirectional input
optocoupler in a single package. The SSR is ideal for
performing switch hook and dial-pulse switching while
the optocoupler performs ring detect and loop current
sensing functions.
The SSR is integrated on a monolithic receptor die. It
features low ON-resistance, high breakdown voltage,
and current-limit circuitry that protects the relay from
telephone line induced lightning surges.
The optocoupler provides bidirectional current sens-
ing via two anti parallel GaAIAs infrared emitting
diodes. The optocoupler provides a minimum current
transfer ratio (CTR) of 33 %.
Agency Approvals
• UL1577, File No. E52744 System Code H or J,
Double Protection
• CSA - Certification 093751
• BSI/BABT Cert. No. 7980
• FIMKO Approval
Applications
• General Telecom Switching
- On/off-hook Control
- Dial Pulse
- Ring-current Detection
- Loop-current sensing
Order Information
Part
LH1549AB
LH1549AAC
LH1549AACTR
Tubes, DIP-8
Gullwing, Tubes, SMD-8
Gullwing, Tape and Reel, SMD-8
Remarks
Document Number 83840
Rev. 1.4, 02-Feb-07
www.vishay.com
1
LH1549AB/AAC/AACTR
Vishay Semiconductors
Absolute Maximum Ratings
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 time can adversely affect reliability.
SSR
Parameter
LED continuous forward current
LED reverse voltage
DC or peak AC load voltage
Continuous DC load current,
unidirectional operation
Ambient operating temperature
range
Storage temperature range
Pin soldering temperature
Input/output isolation test
voltage
Output power dissipation
(continuous)
t = 10 s max
I
R
≤
10 µA
I
L
≤
50 µA
Test condition
Symbol
I
F
V
R
V
L
I
L
T
amb
T
stg
T
sld
V
ISO
P
diss
Value
50
5.0
400
120
- 40 to + 85
- 40 to + 150
260
5300
600
Unit
mA
V
V
mA
°C
°C
°C
V
RMS
mW
Electrical Characteristics
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
evaluations. Typical values are for information only and are not part of the testing requirements.
Input
Parameter
LED forward current, switch
turn-on
LED forward current, switch
turn-off
LED forward voltage
Test condition
I
L
= 100 mA, t = 10 ms
V
L
= ± 350 V
I
F
= 3.0 mA
Symbol
I
Fon
I
Foff
V
F
0.1
0.8
Min
Typ.
0.3
0.4
1.2
1.4
Max
0.5
Unit
mA
mA
V
Output
Parameter
ON-resistance ac/dc:
Pin 4 (±) to 6 (±)
Current limit ac/dc:
Pin 4 (±) to 6 (±)
Off-state leakage current
Output capacitance Pin 4 to 6
Test condition
I
F
= 1.5 mA, I
L
= 50 mA
I
F
= 5.0 mA, V
L
= ± 7.0 V,
t = 5.0 ms
I
F
= 0 mA, V
L
= ± 100 V
I
F
= 0 mA, V
L
= ± 400 V
I
F
= 0 mA, V
L
= 1.0 V
I
F
= 0 mA, V
L
= 50 V
Symbol
R
ON
I
LMT
I
O
I
O
C
O
C
O
50
9.0
Min
17
170
Typ.
25
210
0.04
Max
36
270
200
1.0
Unit
Ω
mA
nA
µA
pF
pF
Transfer
Parameter
Capacitance (input-output)
Turn-on time
Turn-off time
Test condition
V
ISO
= 1.0 V
I
F
= 5.0 mA, I
L
= 50 mA
I
F
= 5.0 mA, I
L
= 50 mA
Symbol
C
IO
t
on
t
off
Min
Typ.
1.3
0.5
1.1
1.0
1.5
Max
Unit
pF
ms
ms
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2
Document Number 83840
Rev. 1.4, 02-Feb-07
LH1549AB/AAC/AACTR
Vishay Semiconductors
Optocoupler Input
Parameter
LED forward voltage
Test condition
I
F
= 10 mA
Symbol
V
F
Min
0.9
Typ.
1.2
Max
1.5
Unit
V
Optocoupler Output
Parameter
Saturation voltage
Collector-emitter leakage
current
Trickle current leakage
Test condition
I
F
= 16 mA, I
C
= 2.0 mA
I
F
= 0 mA, I
C
= 5.0 mA
I
F
= 5.0 µA, I
C
= 5.0 mA
Symbol
V
CE(sat)
I
CEO
I
CEO
Min
Typ.
0.7
Max
0.5
500
1.0
Unit
V
nA
µA
Optocoupler Transfer
Parameter
DC Current Transfer Ratio
Test condition
I
F
= 6.0 mA, V
CE
= 0.5 V
Symbol
CTR
DC
Min
33
Typ.
165
Max
Unit
%
Typical Characteristics
T
amb
= 25 °C, unless otherwise specified
1.6
LED Forward Current for Switch
Turn-on (%),
Normalized
to 25 °C
100
80
60
40
20
0
- 20
- 40
- 60
- 40
- 20
0
20
40
60
80
I
L
= 100 mA
LED Forward
Voltage
(V)
1.5
I
F
= 50 mA
1.4
1.3
1.2
1.1
I
F
= 2.0 mA
I
F
= 5.0 mA
1.0
- 40
- 20
0
20
40
60
80
I
F
= 10 mA
I
F
= 20 mA
ilh1549ab_01
Ambient Temperature (°C)
ilh1549ab_03
Ambient Temperature (°C)
Figure 1. LED Voltage vs. Temperature
Figure 3. LED Current for Switch Turn-on vs. Temperature
40
Change in Current Limit (%)
Normalized
to 25 °C
30
20
10
0
- 10
- 20
- 30
- 40
- 40
ilh1549ab_02
IF = 5.0 mA
t = 5.0 ms
V
L = SEE ELEC. CHAR.
- 20
0
20
40
60
80
Ambient Temperature (°C)
Figure 2. Current Limit vs. Temperature
Document Number 83840
Rev. 1.4, 02-Feb-07
www.vishay.com
3
LH1549AB/AAC/AACTR
Vishay Semiconductors
Package Dimensions in Inches (mm)
DIP
pin one ID
4
0.268 (6.81)
0.255 (6.48)
5
6
7
8
ISO Method A
3
2
1
0.390 (9.91)
0.379 (9.63)
0.045 (1.14)
0.030 (0.76)
4° typ.
0.031(0.79)
0.150 (3.81)
0.130 (3.30)
0.050 (1.27)
0.022 (0.56)
0.018 (0.46)
i178008
0.300 (7.62)
typ.
10°
0.035 (0.89)
0.020 (0.51)
0.100 (2.54) typ.
3° - 9°
0.012 (0.30)
0.008 (0.20)
0.250 (6.35)
0.230 (5.84)
0.130 (3.30)
0.110 (2.79)
Package Dimensions in Inches (mm)
SMD
pin one ID
0.030 (0.76)
0.100 (2.54)
0.390 (9.91)
0.379 (9.63)
0.031 (0.79)
typ.
0.045 (1.14)
0.030 (0.78)
0.150 (3.81)
0.130 (3.30)
Radius
R 0.010 (0.25)
0.070 (1.78)
0.315 (8.00)
min
0.435 (11.05)
0.395 (10.03)
0.375 (9.52)
0.312 (7.80)
0.298 (7.52)
3° to 7°
10°ˇ
0.315
(8.00)
typ.
0.010
(2.54)
typ.
0.060 (1.52)
0.268 (6.81)
0.255 (6.48)
ISO Method A
i178009
4°
typ.
0.050
(1.27)
typ.
0.008 (0.25)
0.004 (0.10)
0.100 (2.54)
typ.
0.040 (1.02)
0.020 (0.51)
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4
Document Number 83840
Rev. 1.4, 02-Feb-07
LH1549AB/AAC/AACTR
Vishay Semiconductors
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 83840
Rev. 1.4, 02-Feb-07
www.vishay.com
5
Embedded System
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