2001 Infineon Technologies Corp. • Optoelectronics Division • San Jose, CA
www.infineon.com/opto • 1-888-Infineon (1-888-463-4636)
3–191 April 10, 2001-16
FEATURES
• Dual Channel (LH1546)
• Current Limit Protection
• l/O Isolation, 5300 V
RMS
• Typical
R
ON
20
Ω
• Load V oltage 350 V
• Load Current 120 mA
• High Surge Capability
• Linear, AC/DC Operation
• Clean Bounce Free Switching
• Low Power Consumption
• SMD Lead Available on Tape and Reel
• Flammability; UL94, VØ
AGENCY APPROVALS
• UL – File No. E52744
• CSA – Certification 093751
• BSI/BABT Cert. No. 7980
• VDE 0884 Approval
• FIMKO Approval
APPLICATIONS
• General Telecom Switching
– On/off Hook Control
– Ring Delay
– 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 integrated
monolithic die for the switch output. The die, fabricated
in a high-voltage dielectrically isolated technology is
comprised of a photodiode array, switch control cir-
cuitry, and MOSFET switches. In addition, the LH1556
SSRs employ current-limiting circuitry, enabling them to
pass FCC 68.302 and other regulatory surge require-
ments when overvoltage protection is provided.
Part Identification
Part Number Description
LH1556AB 8-pin DIP, Tubes
LH1556AAC 8-pin SMD, Gullwing, Tubes
LH1556AACTR 8-pin SMD, Gullwing, Tape and Reel
pin one ID
.268 (6.81)
.255 (6.48)
.390 (9.91)
.379 (9.63)
.045 (1.14)
.030 (0.76)
4° typ.
.100 (2.54) typ.
10°
3°–9°
.300 (7.62)
typ.
.022 (.56)
.018 (.46) .012 (.30)
.008 (.20) .130 (3.30)
.110 (2.79)
.150 (3.81)
.130 (3.30)
.035 (.89)
.020 (.51)
.250 (6.35)
.230 (5.84)
4321
.031 (0.79)
.050 (1.27)
5678
Pin one I.D.
.390 (9.91)
.379 (9.63)
.045 (1.14)
.030 (0.78)
.040 (1.02)
.020 (.51)
4°
typ. .008 (.25)
.004 (.10)
.150 (3.81)
.130 (3.30)
.100 (2.54)
typ.
.050
(1.27)
typ.
.312 (7.80)
.298 (7.52)
.315
(8.00)
typ.
.395 (10.03)
.375 (9.52)
.031 (.79)
typ.
.268 (6.81)
.255 (6.48)
Radius
.010
(2.54)
typ.
10°
3° to 7°
Package Dimensions in Inches (mm)
DIP
SMD
8765
123 4
S2'
S2'
S2
S2
S1
S1 S1'
S1'
LH1556AB/AAC/AACTR
Dual 1 Form A
Solid State Relay
2001 Infineon Technologies Corp. • Optoelectronics Division • San Jose, CA LH1556AB/AAC/AACTR
www.infineon.com/opto • 1-888-Infineon (1-888-463-4636)
3–192 April 10, 2001-16
Absolute Maximum Ratings,
T
A
=25
°
C
Stresses in excess of the absolute Maximum Ratings can cause permanent
damage to the device. These are absolute stress ratings only. Functional oper-
ation 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.
Ambient Temperature Range (
T
A
) ....................................–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
(t=1.0 s) (
V
ISO
)................................................................... 5300 V
RMS
Pole-to-Pole Isolation Voltage (S1 to S2)*
(dry air, dust free, at sea level) ................................................. 1600 V
LED Continuous Forward Current (
I
F
) .........................................50 mA
LED Reverse Voltage (
I
R
≤
10
µ
A) (
V
R
)...........................................8.0 V
DC or Peak AC Load Voltage (
I
L
≤
50
µ
A) (
V
L
).............................. 350 V
Continuous DC Load Current (
I
L
)
One Pole Operating.................................................................120 mA
Two Poles Operating ...............................................................110 mA
Peak Load Current (t=100 ms) (single shot) (
I
P
) ................................ †
Output Power Dissipation (continuous) (
P
DISS
)........................550 mW
* Breakdown occurs between the output pins external to the package.
† Refer to Current Limit Performance Application Note for a discussion on
relay operation during transient currents.
Recommended Operating Conditions
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
Electrical Characteristics,
T
A
=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.
Parameter Symbol Min. Typ. Max. Units Test Conditions
Input
LED Forward Current, Switch Turn-on
I
Fon
— 1.1 2.0 mA
I
L
=100 mA, t=10 ms
LED Forward Current, Switch Turn-off
I
Foff
0.2 1.0 — mA
V
L
±350 V
LED Forward Voltage
V
F
1.15 1.26 1.45 V
I
F
=10 mA
Output
ON-resistance, ac/dc: Pin 4 (±) to 6 (±) R
ON
—2835
Ω
I
F
=5.0 mA,
I
L
=50 mA
ON-resistance, dc: Pin 4, 6 (+) to 5 (-) — 7.0 10.0
Ω
I
F
=5.0 mA,
I
L
=100 mA
OFF-resistance R
OFF
0.5 300 — G
Ω
I
F
=0 mA,
V
L
=±100 V
Current Limit ac/dc I
LMT
170 210 250 mA
I
F
=5.0 mA, t=5.0 ms
V
L
=6.0 V
Off-state Leakage Current I
O
— 1.25 200 nA
I
F
=0 mA,
V
L
=±100 V
— 0.096 1.0
µ
A
I
F
=0 mA,
V
L
=±350 V
Output Capacitance, Pin 4 to 6 C
O
—18—pF
I
F
=0 mA,
V
L
=1.0 V
— 6.7 — pF
I
F
=0 mA,
V
L
=50 V
Switch Offset V
OS
— 0.3 — µV
I
F
=5.0 mA
Transfer
Input/Output Capacitance C
ISO
— 0.67 — pF V
ISO
=1.0 V
Turn-on Time t
on
— 1.14 3.0 ms
I
F
=5.0 mA,
I
L
=50 mA
Turn-off Time t
off
— 0.71 3.0 ms
I
F
=5.0 mA,
I
L
=50 mA
2001 Infineon Technologies Corp. • Optoelectronics Division • San Jose, CA LH1556AB/AAC/AACTR
www.infineon.com/opto • 1-888-Infineon (1-888-463-4636)
3–193 April 10, 2001-16
Typical Performance Characteristics
Figure 1. LED Voltage vs. Temperature
Figure 2. LED Forward Current vs. LED Forward Voltage
Figure 3. LED Reverse Current vs. LED Reverse Voltage
Figure 4. LED Current for Switch Turn-on vs. Temperature
Figure 5. LED Dropout Voltage vs. Temperature
Figure 6. Load Current vs. Load Voltage
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
IF=50 mA
IF=20 mA
IF=5.0 mA
IF=10 mA
IF=1.0 mA
IF=2.0 mA
0
20
40
60
80
100
120
00.511.52
LED Forward Current (mA)
LED forward Voltage (V)
T = 85°C
T = 25°C
T = –40°C
0
2
4
6
8
10
0 20406080100
LED Current (uA)
Reverse LED Voltage (V)
T = –40°C
T = 25°C
T = 85°C
–45
–30
–15
0
15
30
45
60
–40 –20020406080
Temperature (°C)
LED Current for Switch Turn-On
(%), norm. to 25°C
IL = 100 mA
1.02
1.06
1.
.
1
1.14
1.18
1.22
1.26
–40 –200 20406080
Temperature (°C)
LED forward Voltage (V)
IL = 100 mA
01234 5
Load Voltage (V)
Current Limit (µA)
T = –40°C
T = 25°C
T = 85°C
IF = 5 mA
300
250
200
150
100
50
0
2001 Infineon Technologies Corp. • Optoelectronics Division • San Jose, CA LH1556AB/AAC/AACTR
www.infineon.com/opto • 1-888-Infineon (1-888-463-4636)
3–194 April 10, 2001-16
Figure 7. Current Limit vs. Temperature
Figure 8. Switch Breakdown Voltage vs. Load Current
Figure 9. Switch Offset Voltage vs. LED Current
Figure 10. ON-Resistance vs. Temperature
Figure 11. Variation in ON-Resistance vs. LED Current
Figure 12. Switch Capacitance vs. Applied Voltage
40
30
20
10
0
-10
-20
-30
Change in Current Limit (%) Norm. to 25°C
IF = 5 mA
VL = 6 V
Temperature (°C )
-40 -20 0 20 40 60 80
60
50
40
30
20
10
0
Load Current (µA)
Breakdown Voltage (V)
T = –40°C
T = 25°C
T = 85°C
IF = 0 mA
IL < 50 µA
0 100 200 300 400 500
0.0
0.5
1.0
1.5
2.0
2.5
25 35 45 55 65 75 85
Temperature (
°C)
Switch Offset Voltage (microvolt)
IF = 5 mA
I
F
= 5 mA
I
L
= 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
-2
0
2
4
6
8
048121620
ac/dc Ron Variation (%) norm. @ IF= 5mA
LED Forward current (mA)
IF = 5 mA
0
10
20
30
40
50
0 20406080100
Capacitance (pF)
Applied Voltage (V)
IF = 0 mA
2001 Infineon Technologies Corp. • Optoelectronics Division • San Jose, CA LH1556AB/AAC/AACTR
www.infineon.com/opto • 1-888-Infineon (1-888-463-4636)
3–195 April 10, 2001-16
Figure 13. Insertion Loss vs. Frequency
Figure 14. Output Isolation
Figure 15. Leakage Current vs. Applied Voltage at
Elevated Temperatures
Figure 16. Switch Breakdown Voltage vs. Temperature
Figure 17. Switch Offset Voltage vs. Temperature
Figure 18. Turn-On Time vs. T emperature
Frequency (Hz)
0.6
0.0
Insertion Loss (dB)
0.5
0.4
0.2
0.1
10
2
10
3
10
4
10
5
0.3
RL=600 Ω
IF=5 mA
0
20
40
60
80
100
120
Isolation (dB)
Frequency (Hz)
VP = 10 V
RL = 50 Ω
1000 10000 100000 1000000
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
CHANGE IN BREAKDOWN VOLTAGE (%)
NORMALIZED TO 25°C
8
0
4
2
6
–6
–8
–4
–10
–2
AMBIENT TEMPERATURE (°C)
–40 –20 0 20 40 60 80
0.0
0.5
1.0
1.5
2.0
2.5
25 35 45 55 65 75 85
Temperature (
°C)
Switch Offset Voltage (microvolt)
IF = 5 mA
Change in T urn-On Time (%)
norm. to 25°C
Temperature (°C)
10
6
2
-2
-6
-10
-40 -20 0 20 40 60 80
IF=5 mA
IL=50 mA
2001 Infineon Technologies Corp. • Optoelectronics Division • San Jose, CA LH1556AB/AAC/AACTR
www.infineon.com/opto • 1-888-Infineon (1-888-463-4636)
3–196 April 10, 2001-16
Figure 19. T urn-Off Time vs. Temperature
Figure 20. Turn-On Time vs. LED Current
Figure 21. Turn-Off Time vs. LED Current
8
5
2
-1
-4
-7
-10
Change in T urn-Off Time (%)
norm. to 25°C
Temperature (°C)
-40 -20 0 20 40 60 80
IF=5 mA
IL=50 mA
01020304050
Turn-on Time (ms)
IL = 50 mA
T = –40°C
T = 25°C
T = 85°C
LED Forward Current (mA)
18
15
12
9
6
3
0
Turn-Off Time (ms)
T = 85°C
T = 25°C
T = 40°C
LED Forward Current (mA)
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3 01020304050
IL=50 mA
