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S742
Solid State Rela
DESCRIPTION
The S742 is a bi-directional, single-pole, single-throw, normally open multipurpose relay. The circuit is composed of one LED on the input
side which activates an optically coupled IC on the output - controlling the firing angle of two back-to-back SCRs. This circuit assures no
false triggering under most adverse conditions, and a tight zero-volt window not exceeding 5V.
FEATURES APPLICATIONS
1 Form A
Zero-Volt Cross Switching
•
High transient immunity
•
600V blocking voltage
•
1.2A maximum continuous current
•
Low input control current
•
High input-to-output isolation
•
Solid state reliability
•
OPTIONS/SUFFIXES*
High Output Isolation
-H
•
Surface Mount Option
-S
•
-TR
•
NOTE: Suffixes listed above are not included in marking on
device for part number identification.
Tape and Reel
SCHEMATIC DIAGRAM
Valve control
Solenoids
Home appliances
Metering equipment
Heating elements
Gas pump control circuitry
ABSOLUTE MAXIMUM RATINGS*
PARAMETER UNIT MIN TYP MAX
Storage Temperature °C -55 125
Operating Temperature °C -40 85
Continuous Input Current mA 40
Transient Input Current mA 400
Reverse Input Control
Voltage
Output Power Dissipation W 1.2
V 6
*The values indicated are absolute stress ratings. Functional operation of the
device is not implied at these or any conditions in excess of those defined in
electrical characteristics section of this document. Exposure to Absolute
Ratings may cause permanent damage to the device and may adversely
affect reliability.
APPROVALS
BABT CERTIFICATE #607837:
BS EN 60950, BS EN 41003, BS EN 60065
UL FILE #E90096
© 2004 Solid State Optronics • San José, CA
www.ssousa.com • +1.408.293.4600
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rev 1.40 (10/25/2004)
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C
ELECTRICAL CHARACTERISTICS - 25°
PARAMETER UNIT MIN TYP MAX TEST CONDITIONS
INPUT SPECIFICATIONS
S742
1 Form A
Solid State Rela
LED Forward Voltage
LED Reverse Voltage
Must Operate Current
Junction Capacitance
V
V
A
m
F
p
1.2 1.5
612
2.5 5
5
OUTPUT SPECIFICATIONS
Blocking Voltage
Continuous Load Current
Surge Current Rating
Holding Current
On-Voltage
Voltage Across Load at Turn-On
Leakage Current
Thermal Resistance
Power Factor 0.3
Critical Rate of Rise (dV/dt)
V
A
A
m
V
V
µ
°
V
A
A
C/W
/µs
600
100 250
80
400
COUPLED SPECIFICATIONS
Isolation Voltage
-H Suffix
Isolation Resistance
Coupled Capacitance
V
V
G
Ω
F
p
2500
3750
100
6
If = 10mA
Ir = 10uA
Io = 1.2A, resistive load
Vf = 0V
Io = 600uA
1.2
If = 5mA
10
T = 16ms
10
1.2
Io = 1.2A
5
If = 5mA
Vo = 250V
T = 1 minute
T = 1 minute
© 2004 Solid State Optronics • San José, CA
www.ssousa.com • +1.408.293.4600
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PERFORMANCE DATA
S742
1 Form A
Solid State Rela
S742
Maximum Load Current vs. Temperature
Typical Blocking Voltage Distribution
S742
N = 100, Ambient Temperature = 25°C
1500
1000
40
30
20
500
0
Load Current (mA)
0
4
-
-20
0
20
40
60
80
Temperature (C)
10
Device Count
0
600 610 620 630 640 650 660 670
Blocking Voltage (V)
ZERO-VOLT SWITCHING
This solid state relay has been designed with a driver circuit that controls the operation of two back-to-back silicon controlled rectifiers
(SCRs), each responsible for one half of the AC cycle. If an AC signal is examined, the turn on, turn off and zero-volt switching can be seen.
Figure 1 shows a typical 60 Hz, 120Vac signal with a corresponding relay input signal:
5
Relay Input Signal is
Turned Off.
Input Signal
Relay Input Signal is
1
Turned On.
SCR #1 Turns On when
5 V
Threshold
3
SCR #1 Turns Off,
SCR #2 Turns On
at Zero Volts.
2
5V threshold is reached.
4
SCR #2 Turns Off,
SCR #1 Turns On
at Zero Volts.
6
SCR #1 and Relay Turn
Off at Zero Volts.
Figure 1 shows the sequence of zero-volt switching operation. At Stage 1, an input signal is applied to the relay. The relay will not turn on
until the threshold voltage of 5V is reached. Once this point is reached (Stage 2), SCR #1 (designated as the SCR which controls positive
AC voltage) turns on. However, SCR #1 only conducts for an instant, as the cycle quickly crosses zero. At this point (Stage 3), SCR #1 will
turn off and SCR #2 (negative AC voltage) turns on. Likewise, at the next zero cross (Stage 4), SCR #2 will turn off and SCR #1 conducts
again. Even though the input signal is terminated at Stage 5, the relay will continue to conduct (typical SCR behavior) until Stage 6, when
SCR #1 crosses zero and ceases to conduct. Please note that turn on can likewise begin on the negative phase of the AC cycle with a -5V
threshold, though only the positive phase is shown here.
© 2004 Solid State Optronics • San José, CA
www.ssousa.com • +1.408.293.4600
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rev 1.40 (10/25/2004)
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MECHANICAL DIMENSIONS
16 PIN DUAL IN-LINE PACKAGE 16 PIN SURFACE MOUNT DEVICE
END VIEW END VIEW
S742
1 Form A
Solid State Rela
TOP VIEW TOP VIEW
© 2004 Solid State Optronics • San José, CA
www.ssousa.com • +1.408.293.4600
Page 4 of 5 S742
rev 1.40 (10/25/2004)
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R
S742
1 Form A
Solid State Rela
DISCLAIME
Solid State Optronics (SSO) makes no warranties or representations with regards to the completeness and accuracy of this document. SSO
reserves the right to make changes to product description, specifications at any time without further notice.
SSO shall not assume any liability arising out of the application or use of any product or circuit described herein. Neither circuit patent
licenses nor indemnity are expressed or implied.
Except as specified in SSO's Standard Terms & Conditions, SSO disclaims liability for consequential or other damage, and we make no other
warranty, expressed or implied, including merchantability and fitness for particular use.
LIFE SUPPORT POLICY
SSO does not authorize use of its devices in life support applications wherein failure or malfunction of a device may lead to personal injury or
death. Users of SSO devices in life support applications assume all risks of such use and agree to indemnify SSO against any and all
damages resulting from such use. Life support devices are defined as devices or systems which, (a) are intended for surgical implant into the
body, or (b) support or sustain life, and (c) whose failure to perform when used properly in accordance with instructions for use can be
reasonably expected to result in significant injury to the user, or (d) a critical component in any component of a life support device or system
whose failure can be reasonably expected to cause failure of the life support device or system, or to affect its safety or effectiveness.
© 2004 Solid State Optronics • San José, CA
www.ssousa.com • +1.408.293.4600
Page 5 of 5 S742
rev 1.40 (10/25/2004)
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