LH1544AAC/ AACTR/ AB
Document Number 83835
Rev. 1.3, 26-Oct-04
Vishay Semiconductors
www.vishay.com
1
i179034
8
7
6
5
1
2
3
4
S2'
S2
S1
S1'
S2'
S2
S1
S1'
DIP
SMD
Pb
Pb-free
e3
Dual 1 Form A Solid State Relay (Low Capacitance)
Features
Dual Channel, LH1541 Type
Low Capacitance Switch (5.0 pF)
Isolation Test Voltage 5300 V
RMS
Extremely High OFF-resistance
Load Voltage 200 V
Clean Bounce Free Switching
Low Power Consumption
High Reliability Monolithic detector
Lead-free component
Component in accordance to RoHS 2002/95/EC
and WEEE 2002/96/EC
Agency Approvals
UL1577, File No. E52744 System Code H or J,
Double Protection
CSA - Certification 093751
BSI/BABT Cert. No. 7980
DIN EN 60747-5-2 (VDE0884)
DIN EN 60747-5-5 pending
FIMKO Approval
Applications
Instrumentation
- Thermocouple Switching
- Analog Multiplexing
Reed Relay Replacement
Programmable Logic Controllers
Data Acquisition
Test Equipment
Description
These dual SSRs (LH1544, Dual 1 Form A) are SPST
normally open switches which can replace electrome-
chanical relays in many applications. The relays pro-
vide a low-capacitance, high-voltage switch contact
with high off-resistance and low switch-offset voltage.
These characteristics, combined with high-speed
actuation, result in an SSR which is ideal for small sig-
nal and dc instrumentation applications.
The relays are constructed by using a GaAlAs LED for
actuation control and an integrated monolithic die for
the switch output. The die is comprised of a photo-
diode array, switch-control circuity, and low-capaci-
tance MOSFET switches.
Order Information
Part
Remarks
LH1544AAC
Tubes, SMD-8
LH1544AACTR
Tape and Reel, SMD-8
LH1544AB
Tubes, DIP-8
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2
Document Number 83835
Rev. 1.3, 26-Oct-04
LH1544AAC/ AACTR/ AB
Vishay Semiconductors
Absolute Maximum Ratings, T
amb
= 25 C
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
1)
Breakdown occurs between the output pins external to the package
Electrical Characteristics, T
amb
= 25 C
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
Output
Parameter
Test condition
Symbol
Value
Unit
LED continuous forward current
I
F
50
mA
LED reverse voltage
I
R
10 A
V
R
8.0
V
DC or peak AC load voltage
I
L
50 A
V
L
200
V
Continuous DC load current -
one pole operating
I
L
55
mA
Continuous DC load current -
two pole operating
I
L
40
mA
Peak load current (single shot)
t = 100 ms
I
P
100
mA
Ambient temperature range
T
amb
- 40 to + 85
C
Storage temperature range
T
stg
- 40 to + 150
C
Pin soldering temperature
t = 10 s max
T
sld
260
C
Input/output isolation voltage
V
ISO
5300
V
RMS
Pole-to-pole isolation voltage
(S1 to S2)
1)
dry air, dust free, at sea level
1600
V
Output power dissipation
(continuous)
P
diss
600
mW
Parameter
Test condition
Symbol
Min
Typ.
Max
Unit
LED forward current,
switch turn-on
I
L
= 100 mA, t = 10 ms
I
Fon
0.9
2.0
mA
LED forward current,
switch turn-off
V
L
= 300 V
I
Foff
0.2
0.8
mA
LED forward voltage
I
F
= 5.0 mA
V
F
1.10
1.19
1.45
V
Parameter
Test condition
Symbol
Min
Typ.
Max
Unit
ON-resistance
I
F
= 5.0 mA, I
L
= 50 mA
R
ON
70
110
160
Off-resistance
I
F
= 0 mA, V
L
= 100 V
R
OFF
0.5
10000
G
Off-state leakage current
I
F
= 0 mA, V
L
= 100 V
I
O
0.01
200
nA
I
F
= 0 mA, V
L
= 350 V
I
O
1.0
A
Output capacitance
I
F
= 0 mA, V
L
= 1.0 V
C
O
0
pF
Output capacitance Pin 4 to 6
I
F
= 0 mA, V
L
= 50 V
C
O
0.5
pF
Pole-to-pole Capacitance
(S1 to S2)
I
F
= 5.0 mA
0.5
pF
Switch offset
I
F
= 5.0 mA
V
OS
0.1
V
LH1544AAC/ AACTR/ AB
Document Number 83835
Rev. 1.3, 26-Oct-04
Vishay Semiconductors
www.vishay.com
3
Transfer
Footnotes
The following information refers to the SSR Recommended Opera-
tion Conditions:
- Both relays on with equal load currents. For single relay operation,
refer to the LH1541 Recommended Operating Conditions graph.
Typical Characteristics (Tamb = 25
C unless otherwise specified)
Parameter
Test condition
Symbol
Min
Typ.
Max
Unit
Capacitance (input-output)
V
ISO
= 1.0 V
C
IO
1.1
pF
Turn-on time
I
F
= 5.0 mA, I
L
= 50 mA
t
on
0.13
0.25
ms
Turn-off time
I
F
= 5.0 mA, I
L
= 50 mA
t
off
0.6
0.25
ms
Figure 1. Recommended Operating Conditions
Figure 2. LED Voltage vs. Temperature
ilh1544ab_00
30
40
50
0
20
10
-40
-20
0
20
40
60
80
Load
Current
(mA)
Ambient Temperature (C)
IFon = 2.0 mA
IFon = 3.0 mA
IFon = 4.0 mA
IFon = 5.0 to 20 mA
ilh1544ab_01
Ambient Temperature, TA (C)
LED
Forward
Voltage
(V)
-40
-20
0
20
40
60
80
1.6
1.5
1.4
1.3
1.2
1.1
1.0
IF = 1.0 mA
IF = 20 mA
IF = 2.0 mA
IF = 5.0 mA
IF = 10 mA
IF = 50 mA
Figure 3. LED Dropout Voltage vs. Temperature
Figure 4. LED Current for Switch Turn-on vs. Temperature
ilh1544ab_02
-40
0
20
Ambient Temperature (C)
1.20
1.15
1.10
0.95
1.00
40
1.05
80
60
-20
MIN.
TYP.
IL = 100 mA
LED
Forward
Voltage
(V)
ilh1544ab_03
160
-60
150
120
90
-30
-40
-20
0
20
40
60
80
60
0
30
IL = 50 mA
Ambient Temperature (C)
LED
Forward
Current
for
Switch
Turn-on
(%),
Normalized
to
25
C
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4
Document Number 83835
Rev. 1.3, 26-Oct-04
LH1544AAC/ AACTR/ AB
Vishay Semiconductors
Figure 5. ON-Resistance vs. Temperature
Figure 6. Switch Capacitance vs. Applied Voltage
Figure 7. Insertion Loss vs. Frequency
ilh1544ab_04
-40
50
10
30
20
40
-20
-30
-10
-40
0
-20
0
20
40
60
80
Ambient Temperature (C)
IL = 50 mA
Change
in
ON-resistance
(%)
Normalized
to
25
C
ilh1544ab_05
0
10
20
Applied Voltage (V)
6.0
5.0
0.0
30
4.0
100
40
3.0
2.0
1.0
50
60 70
80 90
Capacitance
(pF)
ilh1544ab_06
Frequency (Hz)
1.50
1.75
2.00
0
1.25
1.00
0.50
0.25
102
103
104
105
0.75
RL = 600
Insertion
Loss
(dB)
Figure 8. Output Isolation
Figure 9. Leakage Current vs. Applied Voltage
Figure 10. Leakage Current vs. Applied Voltage at Elevated
Temperatures
ilh1544ab_07
Frequency (Hz)
100
80
60
40
20
0
10 2
10 3
10 4
10 5
10 6
10 7
Isolation
(dB)
VP = 10 V
RL = 50
0
40
80
120
160
200
Load Voltage ( V )
17323
T = 25
C
1
10
100
1000
0.1
O
f
fState
Leakage
Current
(
n
A
)
0
40
80
120
160
200
Load Voltage ( V )
17324
T = 85
C
T = 70
C
T = 50
C
1
10
100
1000
0.1
O
f
fState
Leakage
Current
(
n
A
)
LH1544AAC/ AACTR/ AB
Document Number 83835
Rev. 1.3, 26-Oct-04
Vishay Semiconductors
www.vishay.com
5
Figure 11. Switch Breakdown Voltage vs. Temperature
Figure 12. Switch Offset Voltage vs. Temperature
Figure 13. Switch Offset Voltage vs. LED Current
ilh1544ab_10
Ambient Temperature (C)
-40
-20
0
20
40
60
80
8
4
-8
-10
-6
-4
-2
0
2
6
Change
in
Breakdown
Voltage
(%)
Normalized
to
25
C
ilh1544ab_11
20
40
Ambient Temperature (C)
3.5
0
50
70
60
30
3.0
1.5
2.0
2.5
0.5
1.0
80
90
IF = 5.0 mA
Switch
Offset
Voltage
(
V)
ilh1544ab_12
0
10
LED Forward Current (mA)
0.6
0
15
25
20
5
0.5
0.2
0.3
0.4
0.1
Switch
Offset
Voltage
(
V)
Figure 14. Turn-on Time vs. Temperature
Figure 15. Turn-off Time vs. Temperature
Figure 16. Turn-on Time vs. LED Current
ilh1544ab_13
-40
-20
0
20
40
60
80
Ambient Temperature (C)
70
50
-20
-30
-10
-40
0
10
20
30
40
60
IF = 5.0 mA
IL = 50 mA
Change
in
Turn-on
Time
(%)
Normalized
to
25
C
ilh1544ab_14
120
40
-40
-20
0
20
40
60
80
-80
160
140
-40
100
80
60
20
-20
-60
0
Ambient Temperature (C)
Change
in
Turn-off
Time
(
%)
Normalized
to
25
C
IL = 50 mA
IF = 5.0 mA
ilh1544ab_15
0
0.5
1
1.5
2
0
10
20
30
40
50
LED Current (mA)
T = 85 C
T = 25 C
T = -40 C
IL = 50 mA
Turn-on
Time
(ms)
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