s742 1 form a solid state rela y the s742 is a bi-directional, single-pole, single-throw, normally open multipurpose relay. the circuit is composed of one led o n the input side which activates an optically coupled ic on the output - controlling the firing angle of two back-to-back scrs. this circui t assures no false triggering under most adverse conditions, and a tight zero-volt window not exceeding 5v. description features applications options/suffixes* schematic diagram absolute maximum ratings* approvals zero-volt cross switching ? high transient immunity ? 600v blocking voltage ? 1.2a maximum continuous current ? high input-to-output isolation (3.75kv min) ? solid state reliability ? rohs / pb-free / reach compliant ? valve control ? solenoids ? home appliances ? metering equipment ? heating elements ? surface mount l eadform optio n (25 pcs / tube) ? -s tape and reel packing optio n (1,000 pcs / reel) ? -tr note: suffixes listed above are not included in marking on device for part number identification. 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 v 6 output power dissipation w 1.2 solder temperature - wave (10s) oc 260 solder temperature - ir reflow (10s) oc 260 *the values indicated are absolute stres s 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. ul approved: file #e90096 ? www.ssousa.com ? +1.408.293.4600 page 1 of 5 s742 rev 1.44 (2/4/2011) ? 2011 solid state optronics ? san jos, ca
s742 1 form a solid state rela y electrical characteristics - 25c parameter unit min typ max test conditions input specifications led forward voltage v 1.2 1.5 if = 10ma led reverse voltage v 612 ir = 10ua turn on current (resistive load) m 5 6.5 io = 1.2a a turn on current (inductive load) m 10 12 io = 300a (ac) a junction capacitance p 5 vf = 0v f output specifications blocking voltage v 600 continuous load current a 1.2 if = 6.5ma surge current rating a 10 t = 16ms holding current m 10 a on-voltage v 1.2 io = 1.2a zero cross turn on threshold voltage v 5 if = 6.5ma leakage current p 100 250 vo = 250v a thermal resistance oc / w 80 power factor 0.3 see note 1 below critical rate of rise (dv/dt) v 400 / p s coupled specifications isolation voltage v 3750 t = 1 minute isolation resistance g 100 : coupled capacitance p 6 f www.ssousa.com ? +1.408.293.4600 page 2 of 5 s742 rev 1.44 (2/4/2011) ? 2011 solid state optronics ? san jos, ca note 1: snubber circuits may be required for lower power factors 1
s742 1 form a solid state rela y performance data 0 10 20 30 40 600 610 620 630 640 650 660 670 blocking voltage (v) device count) s742 typical blocking voltage distribution n = 100, ambient temperature = 25c 0 500 1000 1500 -40 -20 0 20 40 60 80 temperature (c) load current (ma) s742 maximum load current vs. temperature 5 v threshold input signal scr #1 turns on when 5v threshold is reached. scr #1 turns off, scr #2 turns on at zero volts. scr #2 turns off, scr #1 turns on at zero volts. scr #1 and relay turn off at zero volts. 5 4 2 6 3 1 relay input signal is turned on. relay input signal is turned off. this solid state relay has been designed with a driver circuit t hat controls the operation of two back-to-back silicon controll ed 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 switchi ng can be seen. figure 1 shows a typical 60 hz, 120vac si gnal with a corresponding relay input signal: zero-volt switching figure 1 shows the sequence of zero-volt switching operation. at stage 1, an input signal is applied to the relay. the relay wi ll 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 control s positive ac voltage) turns on. however, scr #1 only conducts for an instan t, 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, th e relay will continue to conduct (typical scr behavior) until s tage 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 wi th a -5v threshold, though only the positive phase is shown here. www.ssousa.com ? +1.408.293.4600 page 3 of 5 s742 rev 1.44 (2/4/2011) ? 2011 solid state optronics ? san jos, ca
s742 1 form a solid state rela y mechanical dimensions 16 pin dual in-line package 16 pin surface mount device end view end view top view top view www.ssousa.com ? +1.408.293.4600 page 4 of 5 s742 rev 1.44 (2/4/2011) ? 2011 solid state optronics ? san jos, ca
s742 1 form a solid state rela y solid state optronics (sso) makes no warranties or representations with regards to the completeness and accuracy of this docume nt. 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 appl ication or use of any product or circuit described herein. neither ci rcuit 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 mak e no other warranty, expressed or implied, including m erchantability and fitness for particular use. disclaime r life support polic y sso does not authorize use of its devices in life support applications wherein failure or malfunction of a device may lead to p ersonal injury or death. users of sso devices in life support applications assume all risks of such use and agree to indemnify sso against any an d all damages resulting from such use. life support devices are defined as devices or systems which, (a) are intended for surgical im plant into the body, or (b) support or sustain life, and (c ) whose failure to perform when used properly in accordance with instructions for u se 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 caus e failure of the life support device or system, or to affect its safety or effe ctiveness. www.ssousa.com ? +1.408.293.4600 page 5 of 5 s742 rev 1.44 (2/4/2011) ? 2011 solid state optronics ? san jos, ca
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