LH1556AB/ AAC/ AACTR
Document Number 83842
Rev. 1.3, 26-Oct-03
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
Features
Dual Channel (LH1546)
Current Limit Protection
Isolation Test Voltage 5300 V
RMS
Typical R
ON
28
Load Voltage 350 V
Load Current 120 mA
High Surge Capability
Clean Bounce Free Switching
Low Power Consumption
SMD Lead Available on Tape and Reel
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
General Telecom Switching
- On/off Hook Control
- Ring Relay
- Dial Pulse
- Ground Start
- Ground Fault Protection
Instrumentation
Industrial Controls
Description
The LH1556 dual 1 Form A relays are SPST normally
open switches that can replace electromechanical
relays in many applications. They are constructed
using a GaAIAs LED for actuation control and an inte-
grated monolithic die for the switch output. The die,
fabricated in a high-voltage dielectrically isolated
technology is comprised of a photodiode array, switch
control circuitry, and MOSFET switches. In addition,
the LH1556 SSRs employ current-limiting circuitry,
enabling them to pass FCC 68.302 and other regula-
tory surge requirements when overvoltage protection
is provided.
Order Information
Part
Remarks
LH1556AB
Tubes, DIP-8
LH1556AAC
Tubes, SMD-8
LH1556AACTR
Tape and Reel, SMD-8
www.vishay.com
2
Document Number 83842
Rev. 1.3, 26-Oct-03
LH1556AB/ AAC/ AACTR
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)
Refer to Current Limit Performance Application Note for a discussion on relay operation during transient currents.
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
350
V
Continuous DC load current -
one pole operating
I
L
120
mA
Continuous DC load current -
two pole operating
I
L
250
mA
Peak load current (single shot)
t = 100 ms
I
P
1)
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
s
260
C
Input/output isolation voltage
V
ISO
5300
V
RMS
Output power dissipation
(continuous)
P
diss
550
mW
Parameter
Test condition
Symbol
Min
Typ.
Max
Unit
LED forward current, switch
turn-on
I
L
= 100 mA, t = 10 ms
I
Fon
1.1
2.0
mA
LED forward current, switch
turn-off
V
L
= 350 V
I
Foff
0.2
1.0
mA
LED forward voltage
I
F
= 10 mA
V
F
1.15
1.26
1.45
V
Parameter
Test condition
Symbol
Min
Typ.
Max
Unit
ON-resistance ac/dc:
Pin 4 () to 6 ()
I
F
= 5.0 mA, I
L
= 50 mA
R
ON
28
35
ON-resistance dc:
Pin 4, 6 (+) to 5 (-)
I
F
= 5.0 mA, I
L
= 100 mA
R
ON
7.0
10.0
Off-resistance
I
F
= 0 mA, V
L
= 100 V
R
OFF
0.5
300
G
Current limit ac/dc
I
F
= 5.0 mA, V
L
= 6.0 V,
t = 5.0 ms
I
LMT
170
210
250
mA
Off-state leakage current
I
F
= 0 mA, V
L
= 100 V
I
O
0.35
200
nA
I
F
= 0 mA, V
L
= 350 V
I
O
0.096
1.0
A
Output capacitance Pin 4 to 6
I
F
= 0 mA, V
L
= 1.0 V
C
O
18
pF
I
F
= 0 mA, V
L
= 50 V
C
O
6.7
pF
Switch offset
I
F
= 5.0 mA
V
OS
0.3
V
LH1556AB/ AAC/ AACTR
Document Number 83842
Rev. 1.3, 26-Oct-03
Vishay Semiconductors
www.vishay.com
3
Transfer
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
0.67
pF
Turn-on time
I
F
= 5.0 mA, I
L
= 50 mA
t
on
1.14
3.0
ms
Turn-off time
I
F
= 5.0 mA, I
L
= 50 mA
t
off
0.71
3.0
ms
Figure 1. Recommended Operating Conditions
Figure 2. LED Voltage vs. Temperature
ilh1556ab_00
60
80
0
40
120
100
20
-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
ilh1556ab_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 Forward Current vs. LED Forward Voltage
Figure 4. LED Reverse Current vs. LED Reverse Voltage
ilh1556ab_02
0
20
40
60
80
100
120
0
0.5
1
1.5
2
LED
Forward
C
urrent
(mA)
LED forward Voltage (V)
T = 85 C
T = 25 C
T = -40 C
ilh1556ab_03
0
2
4
6
8
10
0
20
40
60
80
100
LED
Current
(uA)
Reverse LED Voltage (V)
T = -40 C
T = 25 C
T = 85 C
www.vishay.com
4
Document Number 83842
Rev. 1.3, 26-Oct-03
LH1556AB/ AAC/ AACTR
Vishay Semiconductors
Figure 5. LED Current for Switch Turn-on vs. Temperature
Figure 6. LED Dropout Voltage vs. Temperature
Figure 7. Load Current vs. Load Voltage
ilh1556ab_04
-45
-30
-15
0
15
30
45
60
-40
-20
0
20
40
60
80
Temperature (C)
LED
Current
for
Switch
Turn-On
(%),
norm.
to
25
C
IL= 100 mA
ilh1556ab_05
1.02
1.06
1.1
1.14
1.18
1.22
1.26
-40
-02
0
20
40
60
80
Temperature (C)
LED
forward
Voltage
(V)
IL = 100 mA
ilh1556ab_06
0
1
2
3
4
5
Load Voltage (V)
Current
Limit
(
A)
T = -40 C
T = 25 C
T = 85 C
IF = 5 mA
300
250
200
150
100
50
0
Figure 8. Current Limit vs. Temperature
Figure 9. Switch Breakdown Voltage vs. Load Current
Figure 10. Switch Offset Voltage vs. LED Current
ilh1556ab_07
40
30
20
10
0
-10
-20
-30
Change
in
Current
Limit
(%)
Norm.
to
25
C
IF = 5 mA
VL = 6 V
-40
-20
0
20
40
60
80
Temperature (C)
ilh1556ab_08
60
50
40
30
20
10
0
Load
Current
(
A)
Breakdown Voltage (V)
T = -40 C
T = 25 C
T = 85 C
IF = 0 mA
IL < 50 A
0
100
200
300
400
500
ilh1556ab_09
0.0
0.5
1.0
1.5
2.0
2.5
25
35
45
55
65
75
85
Temperature (C)
Switch
Offset
Voltage
(mV)
IF = 5 mA
LH1556AB/ AAC/ AACTR
Document Number 83842
Rev. 1.3, 26-Oct-03
Vishay Semiconductors
www.vishay.com
5
Figure 11. ON-Resistance vs. Temperature
Figure 12. Variation in ON-Resistance vs. LED Current
Figure 13. Switch Capacitance vs. Applied Voltage
ilh1556ab_10
IF = 5 mA
IF = 50 mA
Temperature (C)
Change
in
Ron
(%),
norm.
to
25
C
40
30
20
10
0
-10
-20
-30
-40
-40
-20
0
20
40
60
80
ilh1556ab_11
-2
0
2
4
6
8
0
4
8
12
16
20
ac/dc
Ron
Variation
(%)
norm.
@
I F
=
5mA
LED Forward current (mA)
IF = 5 mA
ilh1556ab_12
0
10
20
30
40
50
0
20
40
60
80
100
Capacitance
(pF)
Applied Voltage (V)
IF = 0 mA
Figure 14. Insertion Loss vs. Frequency
Figure 15. Output Isolation
Figure 16. Leakage Current vs. Applied Voltage at Elevated
Temperatures
ilh1556ab_13
Frequency (Hz)
0.6
0.0
Inser
tion
Loss
(dB)
0.5
0.4
0.2
0.1
10 2
10 3
10 4
10 5
0.3
RL = 600
IF = 5 mA
ilh1556ab_14
0
20
40
60
80
100
120
Isolation
(dB)
Frequency (Hz)
VP= 10 V
RL = 50
1000
10000
100000
1000000
ilh1556ab_15
0.1
1.0
10.0
100.0
1000.0
0
50
100
150
200
250
300
350
Load voltage (V)
Leakage
Current
(nA)
T = 85 C
T = 70 C
T = 50 C
IF = 0 mA
T = 25 C
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