LH1556FP/FPTR
Dual 1 Form A
Solid State Relay
FEATURES
• Two Independent Relays in a Single Package
• Package—
FLAT PAK
• l/O Isolation, 3000 V
RMS
• Solid-state Relay
– Typical
R
ON
20
Ω
– Load Voltage 350 V
– Load Current 120 mA
– Current Limit Protection
– High Surge Capability
– Linear, AC/DC Operation
– Clean Bounce Free Switching
– Low Power Consumption
– High Reliability Monolithic Receptor
AGENCY APPROVALS
• UL – File No. E52744
• BSI/BABT Cert. No. 7980
APPLICATIONS
• General Telecom Switching
– On/off Hook Control
– Ring Relay
– Ground Start
• Industrial Controls
– Triac Predriver
– Output Modules
• Peripherals
– Transducer Driver
• Instrumentation
– Automatic Tuning/Balancing
– Flying Capacitor
– Analog Multiplexing
• See Application Note 56
DESCRIPTION
The LH1556FP is robust, ideal for telecom and ground
fault applications. It contains two SPST normally open
switches (1 Form A) that replace electromechanical
relays in many applications. It is constructed using a
GaAs LED for actuation control and an integrated mono-
lithic die for the switch output. The die, fabricated in a
high-voltage dielectrically isolated BCDMOS technol-
ogy, is comprised of a photodiode array, switch control
circuitry and MOSFET switches. In addition, it employs
current-limiting circuitry which meets FCC 68.302 and
other regulatory voltage surge requirements when over-
voltage protection is provided.
Dimensions in Inches (mm)
.029
(.74)
pin
one
ID
.180
(4.57)
A 1
K 2
A 3
K 4
8 S
1
7 S’
1
6 S
2
5 S’
2
.374 typ.
(9.50)
See Detail A
.000–.004
(.000–.102)
.080
(2.03)
.016
(.41)
.100
(2.54)
Lead
coplarity
.004 (.10)
max.
.274
.216 (6.96)
(5.48)
40°
.015 (.39)
.010 typ.
(.25)
.020
(.50)
Detail A
(not to scale)
)
13
(2. 1)
4
.08 6 (.4
1
.0
3°–7°
.020 (.51)
.010 (.25)
Part Identification
Part Number
LH1556FP
LH1556FPTR
Description
8-pin SMD, Tubes
8-pin SMD, Tape and Reel
Document Number: 83842
Revision 17-August-01
www.vishay.com
3–196
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.
Package
Ambient Temperature Range ...........................................–40 to +85
°
C
Storage Temperature Range ..........................................–40 to +125
°
C
Soldering Temperature (t=10 s max.).......................................... 260
°
C
Isolation Test Voltage (t=1.0 s) .............................................3000 V
RMS
Isolation Resistance
V
IO
=500 V,
T
A
=25
°
C
.................................................................... ≥
10
12
Ω
V
I
O
=500 V,
T
A
=100
°
C
.................................................................. ≥
10
11
Ω
Total Power Dissipation ............................................................ 550 mW
SSR
LED Continuous Forward Current ...............................................50 mA
LED Reverse Voltage (
I
R
≤
10
µ
A)................................................... 6.0 V
DC or Peak AC Load Voltage (
I
L
≤
50
µ
A) ..................................... 350 V
Continuous DC Load Current ....................................................120 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
Input
LED Forward Current for Switch Turn-on
LED Forward Current for Switch Turn-off
LED Forward Voltage
Current Limit
Output
ON-Resistance, AC/DC: Pin 3 (±) to 4 (±)
OFF-Resistance
Off-state Leakage Current
Symbol
Min.
Typ.
Max.
Unit
Test Condition
I
Fon
I
Foff
V
F
I
limit
—
0.2
1.0
230
1.1
0.6
1.18
260
2.0
—
1.45
370
mA
mA
V
mA
I
L
=100 mA, t=10 ms
V
L
=
±
300 V
I
F
=10 mA
I
F
=5.0 mA, t=5.0 ms
V
L
=
±
6.0 V
R
ON
R
OFF
I
O
—
0.5
—
—
20
5000
0.32
—
55
10
35
—
200
1.0
—
—
Ω
G
Ω
nA
I
F
=5 mA,
I
L
=50 mA
I
F
=0 mA,
V
L
=
±
100 V
I
F
=0 mA,
V
L
=
±
100 V,
I
F
=0 mA,
V
L
=
±
350 V
I
F
=0 mA,
V
L
=1.0 V
I
F
=0 mA,
V
L
=50 V
µ
A
pF
pF
Output Capacitance, Pin 3 to 4
C
O
—
—
Transfer
Turn-on Time
Turn-off Time
Input/Output Capacitance
t
on
t
off
C
ISO
—
—
—
2.0
0.08
0.6
3.0
3.0
—
ms
ms
pF
I
F
=5.0 mA,
I
L
=50 mA
I
F
=5.0 mA,
I
L
=50 mA
V
ISO
=1.0 V
Document Number: 83842
Revision 17-August-01
www.vishay.com
3–197
Typical Performance Characteristics
Figure 1. LED Voltage vs. Temperature
1.6
1.5
LED Forward Voltage (V)
1.4
1.3
1.2
1.1
I
F
=1.0 mA
I
F
=2.0 mA
I
F
=5.0 mA
I
F
=10 mA
–20
0
20
40
60
Ambient Temperature (°C)
80
I
F
=20 mA
Change in Current Limit (%)
Normalized to 25°C
Figure 4. Current Limit vs. Temperature
40
30
20
10
0
–10
–20
–30
–40
–40
–20
0
20
40
60
80
I
F
= 5.0 mA
t = 5.0 ms
V
L
=
SEE ELEC. CHAR
.
I
F
=50 mA
1.0
–40
Ambient Temperature (°C)
Figure 2. LED Current for Switch Turn-on vs. Temperature
100
I
L
= 100 mA
Figure 5. Switch Breakdown Voltage vs. Temperature
8
Change in Breakdown Voltage (%)
Normalized to 25°C
6
4
2
0
–2
–4
–6
–8
–40
–20
0
20
40
60
80
LED Forward Current for Switch
Turn-on (%), Normalized to 25
°C
80
60
40
20
0
–20
–40
–60
–40
–20
0
20
40
60
80
Ambient Temperature (°C)
Ambient Temperature (°C)
Figure 3. ON-Resistance vs. Temperature
40
30
Change in R
ON
(%)
20
10
0
–10
–20
–30
–40
–40
–20
0
20
40
60
80
I
F
= 5.0 mA
I
L
= 50 mA
Figure 6. Switch Capacitance vs. Applied Voltage
80
70
60
Capacitance (pF)
50
40
30
20
10
0
0
20
40
60
80
100
Ambient Temperature (°C)
Document Number: 83842
Revision 17-August-01
Applied Voltage (V)
www.vishay.com
3–198
Figure 7. Leakage Current vs. Applied Voltage
100
T=85°C
Figure 9. Turn-off Time vs. Temperature
80
I
F
=10 mA
60
Change in Toff (%)
Normalized to 25°C
40
20
0
–20
–40
–60
I
F
=5.0 mA
I
F
=4.0 mA
I
F
=3.0 mA
I
F
=2.0 mA
–20
0
20
40
60
80
I
F
=8.0 mA
I
F
=6.0 mA
10
Leakage (pA)
T=50°C
T=70°C
1.0
T=25°C
0.1
0
50
100
150
200
250
300
350
400
–80
–40
Load Voltage (V)
Ambient Temperature (°C)
Figure 8. Leakage Current vs. Applied Voltage
10000
Figure 10. Turn-on Time vs. LED Current
7
6
1000
Leakage (pA)
Ton (ms)
5
4
3
2
1
100
10
T=85°C
T=25°C
T=–45°C
1
0
50
100
150
200
250
300
350
400
Load Voltage (V)
0
0
5
10
15
20
25
30
35
40
45
50
LED Forward Current (mA)
Document Number: 83842
Revision 17-August-01
www.vishay.com
3–199
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