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| S742-X 1 Form A Solid State Relay DESCRIPTION The S742-X 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. A 300-ohm input resistor in series with the LED is also provided in this circuit. FEATURES APPLICATIONS * * * * * * * * * Inverse parallel SCR output High transient immunity 600V blocking voltage 1.2A maximum continuous current Low input control current High input-to-output isolation Solid state reliability Zero-volt switching 300 ohm input resistor * * * * * * * * Programmable controls Valve control Solenoids Remote switching Home appliances Metering equipment Heating elements Gas pump control circuitry OPTIONS/SUFFIXES MAXIMUM RATINGS PARAMETER Storage Temperature Operating Temperature Continuous Input Current Transient Input Current Reverse Input Control Voltage Output Power Dissipation UNIT C C mA mA V W 6 1.2 MIN -55 -40 TYP MAX 125 85 40 400 * * * -H -S -TR High Output Isolation Surface Mount Option Tape and Reel SCHEMATIC DIAGRAM APPROVALS * * BABT CERTIFICATE #607837: BS EN 60950, BS EN 41003, BS EN 60065 UL FILE #E90096 rev 2.0 (9/24/04) Solid State Optronics 1.888.377.4776 www.ssousa.com S742-X 1 Form A Solid State Relay ELECTRICAL CHARACTERISTICS - 25C PARAMETER INPUT SPECIFICATIONS LED Forward Voltage LED Reverse Voltage Input Resistor Must Operate Current Junction Capacitance V V mA pF 5 6 1.2 12 300 2.5 5 Io = 1.2A, resistive load Vf = 0V 1.5 If = 10mA Ir = 10uA UNIT MIN TYP MAX TEST CONDITIONS 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 Critical Rate of Rise (dV/dt) V/ s 400 V A A mA V V A C / 100 150 0.3 600 1.2 10 10 1.2 5 250 Io = 1.2A If = 5mA Vo = 250V Io = 600uA If = 5mA T = 16ms COUPLED SPECIFICATIONS Isolation Voltage -H Suffix Isolation Resistance Coupled Capacitance V V G pF 2500 3750 100 6 T = 1 minute T = 1 minute rev 2.0 (9/24/04) Solid State Optronics 1.888.377.4776 www.ssousa.com S742-X 1 Form A Solid State Relay PERFORMANCE DATA S742-X Typical Load Current vs. Temperature S742-X Typical Blocking Voltage Distribution N = 100, Ambient Temperature = 25C Load Current (mA) 1500 50 Device Count 40 30 20 10 0 590 600 610 620 630 640 650 660 Blocking Voltage (V) 1000 500 0 -40 -20 0 20 40 60 80 Tem perature (C) 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: 1 Relay Input Signal is Turned On. 5 Relay Input Signal is Turned Off. Input Signal 2 SCR #1 Turns On when 5V threshold is reached. 6 SCR #1 and Relay Turn Off at Zero Volts. 5V Threshold 3 SCR #1 Turns Off, SCR #2 Turns On at Zero Volts. 4 SCR #2 Turns Off, SCR #1 Turns On 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. rev 2.0 (9/24/04) Solid State Optronics 1.888.377.4776 www.ssousa.com S742-X 1 Form A Solid State Relay MECHANICAL DIMENSIONS 16 PIN DUAL IN-LINE PACKAGE 16 PIN SURFACE MOUNT DEVICE END VIEW END VIEW TOP VIEW TOP VIEW rev 2.0 (9/24/04) Solid State Optronics 1.888.377.4776 www.ssousa.com |
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