LH1540AAB/ AABTR/ AT
Document Number 83833
Rev. 1.4, 26-Oct-04
Vishay Semiconductors
www.vishay.com
1
4
6
5
S'
S
DC
1
2
3
S
S'
i179001
DIP
SMD
Pb
Pb-free
e3
1 Form A Solid State Relay
Features
Current Limit Protection
Isolation Test Voltage 5300 V
RMS
Typical R
ON
20
, max 25
Load Voltage 350 V
Load Current 120 mA
High Surge Capability
Clean Bounce Free Switching
Low Power Consumption
High Reliability Monolithic Detector
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
FIMKO Approval
Applications
General Telecom Switching
- On/off Hook Control
- Ring Delay
- Dial Pulse
- Ground Start
- Ground Fault Protection
Instrumentation
Industrial Controls
See "Solid State Relays" (Application Note 56)
Description
The LH1540 is robust, ideal for telecom and ground
fault applications. It is a SPST normally open switch
(Form A) that replaces electromechanical relays in
many applications. It is constructed using a GaAIAs
LED for actuation control and an integrated monolithic
die for the switch output. The die, fabricated in a high-
voltage dielectrically isolated technology, is com-
prised of a photodiode array, switch control circuitry
and MOSFET switches. In addition, it employs cur-
rent-limiting circuitry which meets FCC 68.302 and
other regulatory voltage surge requirements when
overvoltage protection is provided.
Order Information
Part
Remarks
LH1540AAB
Thru Hole, SMD-6
LH1540AABTR
Tape and Reel, SMD-6
LH1540AT
DIP-6
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2
Document Number 83833
Rev. 1.4, 26-Oct-04
LH1540AAB/ AABTR/ AT
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 -
bidirectional operation
I
L
120
mA
Continuous DC load current -
unidirectional operation
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
sld
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
1.0
2.0
mA
LED forward current,
switch turn-off
V
L
= 300 V
I
Foff
0.2
0.9
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
12
20
25
ON-resistance dc:
Pin 4, 6 (+) to 5 ()
I
F
= 5.0 mA, I
L
= 100 mA
R
ON
3.0
5.0
6.25
Off-resistance
I
F
= 0 mA, V
L
= 100 V
R
OFF
0.5
5000
G
Current limit ac/dc :
Pin 4 () to 6 ()
I
F
= 5.0 mA, V
L
= 6.0 V,
t = 5.0 ms
I
LMT
175
210
250
mA
Off-state leakage current
I
F
= 0 mA, V
L
= 100 V
I
O
0.32
200
nA
I
F
= 0 mA, V
L
= 350 V
I
O
1.0
A
Output capacitance Pin 4 to 6
I
F
= 0 mA, V
L
= 1.0 V
C
O
55
pF
I
F
= 0 mA, V
L
= 50 V
C
O
10
pF
Switch offset
I
F
= 5.0 mA
V
OS
0.15
V
LH1540AAB/ AABTR/ AT
Document Number 83833
Rev. 1.4, 26-Oct-04
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
0.8
pF
Turn-on time
I
F
= 5.0 mA, I
L
= 50 mA
t
on
1.2
2.0
ms
Turn-off time
I
F
= 5.0 mA, I
L
= 50 mA
t
off
0.5
2.0
ms
Figure 1. Recommended Operating Conditions
Figure 2. LED Voltage vs. Temperature
0
0
i1540at_01
AMBIENT TEMPERATURE (C)
LED
FORWARD
VOLTAGE
(V)
1.6
1.5
1.4
1.0
1.3
1.2
1.1
40
20
0
20
40
60
80
I
F
=50 mA
I
F
=20 mA
I
F
=5.0 mA
I
F
=10 mA
I
F
=1.0 mA
I
F
=2.0 mA
Figure 3. LED Dropout Voltage vs. Temperature
Figure 4. LED Current for Switch Turn-on vs. Temperature
i1540at_02
AMBIENT TEMPERATURE (
C)
40
20
0
20
40
60
80
LED
F
ORWARD
VOLTAGE
(
V)
1.20
1.15
1.10
0.95
1.00
1.05
MIN.
TYP.
I
L
=100 mA
i1540at_03
AMBIENT TEMPERATURE (
C)
100
60
LED
FORWARD
CURRENT
FOR
S
WITCH
TURN-ON
(%)
NORMALIZED
TO
25
C
80
60
40
40
40
20
20
0
20
0
20
40
60
80
I
L
=100 mA
www.vishay.com
4
Document Number 83833
Rev. 1.4, 26-Oct-04
LH1540AAB/ AABTR/ AT
Vishay Semiconductors
Figure 5. Current Limit vs. Temperature
Figure 6. ON-Resistance vs. Temperature
Figure 7. Variation in ON-Resistance vs. LED Current
i1540at_04
CHANGE
IN
CURRENT
L
IMIT
(%)
NORMALIZED
T
O
2
5
C
40
10
30
20
0
20
10
40
30
t=5 ms
AMBIENT TEMPERATURE (C)
I
F
=5.0 mA
V
L
=
SEE ELEC. CHAR.
40
20
0
20
40
60
80
i1540at_05
CHANGE
IN
ON-RESISTANCE
(%)
NORMALIZED
TO
25
C
50
10
30
20
40
20
30
10
40
0
AMBIENT TEMPERATURE (
C)
40
20
0
20
40
60
80
I
L
=50 mA
i1540at_06
0
4
8
12
16
20
1.5
0.5
0.5
1.0
0
LED FORWARD CURRENT (mA)
I
L
=50 mA
ac/dc
ON-RESISTANCE
VARIATION
(
%)
NORMALIZED
TC
DATA
SHEET
R
ON
SPECIFICATION
@
I
F
=5.0
mA
Figure 8. Switch Capacitance vs. Applied Voltage
Figure 9. Insertion Loss vs. Frequency
Figure 10. Output Isolation
i1540at_07
0
CAPACITANCE
(
pF)
80
60
50
0
40
30
20
10
70
20
40
APPLIED VOLTAGE (V)
60
100
80
I
F
=0
f=1.0 MHz
i1540at_08
FREQUENCY (Hz)
0.30
0
INSERTION
LOSS
(dB)
0.25
0.20
0.10
0.05
10
2
10
3
10
4
10
5
0.15
R
L
=600
i1540at_09
FREQUENCY (Hz)
100
ISOLATION
(
dB)
80
60
40
20
0
V
P
=10 V
R
L
=50
10
2
10
3
10
4
10
5
10
6
10
7
LH1540AAB/ AABTR/ AT
Document Number 83833
Rev. 1.4, 26-Oct-04
Vishay Semiconductors
www.vishay.com
5
Figure 11. Leakage Current vs. Applied Voltage
Figure 12. Leakage Current vs. Applied Voltage at Elevated
Temperatures
Figure 13. Switch Breakdown Voltage vs. Temperature
0
10
20
30
40
50
60
70
80
0
100
200
300
400
Load Voltage ( V )
17321
O
f
fState
Leakage
Current
(
n
A
)
T = 25
C
0
20
40
60
80
100
120
140
0
100
200
300
400
Load Voltage ( V )
17322
O
f
fState
Leakage
Current
(
n
A
)
T = 85
C
T = 75
C
T = 50
C
i1540at_12
40
20
0
20
40
60
80
AMBIENT TEMPERATURE (
C)
CHANGE
I
N
B
REAKDOWN
VOLTAGE
(%)
NORMALIZED
T
O
2
5
C
8
0
4
2
6
2
6
8
4
Figure 14. Switch Offset Voltage vs. Temperature
Figure 15. Switch Offset Voltage vs. LED Current
Figure 16. Turn-on Time vs. Temperature
i1540at_13
20
30
40
50
60
70
80
90
AMBIENT TEMPERATURE (
C)
SWITCH
OFFSET
VOLTAGE
(
V)
3.5
0
3.0
1.5
2.0
2.5
0.5
1.0
I
F
=5.0 mA
i1540at_14
LED FORWARD CURRENT (mA)
SWITCH
OFFSET
VOLTAGE
(
V)
0.6
0
0.5
0.2
0.3
0.4
0.1
0
5
10
15
20
25
i1540at_15
40
20
0
20
40
60
80
AMBIENT TEMPERATURE (
C)
CHANGE
IN
TURN-ON
TIME
(
%)
NORMALIZED
T
O
2
5
C
60
50
20
30
10
0
10
20
30
40
40
I
F
=5.0 mA
I
L
=50 mA
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