FM712 for extended common - mode rs - 485 applications protection of rs - 485 transceivers with extended common C mode range security systems automatic teller machines hfc systems networks feature 400 watts peak pulse power(tp=8/20us) esd protection:level 4 low clamping voltage protects two +12v to C 7v lines iec compatibility en61000 - 4 61000 - 4 - 2(esd):level4,contact:8kv,air::15kv 61000 - 4 - 4(eft):40a - 5/50ns 61000 - 4 - 5(surge):12a,8/20us mechanical characteristics molded jedec sot - 23 the futurewafer? device will meet iec61000 - 4 - 2 (esd) flammability rating ul 94v - 0 halogen free maximum ratings@25 unless otherwise specified parameter symbol value units peak pulse power (tp=8/20us) see fig 1. p pp 400 watts operating temperature t j - 55 ~150 c storage temperature t stg - 55 ~150 c sot - 23 device characteristics pin , g h q w l i l f d w l r q 1,2 input lines 3 ground e1506f3c - std - fw - 003 futurewafer tech co., ltd
rating and characteristic curve pin 1 to 3 and 2 to 3 (12v tvs) 3 l q w r d q g w r 9 7 9 6 8 q l w v parameter symbol condition min. typ. max. min. typ. max. reverse stand - off voltage v rwm pin 3 to 1 or pin 2 to 1 12 7 v reverse breakdown voltage v br i z =1ma 13.3 7.5 v reverse leakage current i r v r =v rwm 1 20 ua forward voltage v f i f =15ma 1.15 v clamping voltage v c i pp =5a i pp =17a, 20 26 10 12 v junction capacitance c i/o - i/o vdc=0v, f=1m hz 75 75 pf figure 1 non - repetitive peak pulse power vs. pulse time electrical characteristics e1506f3c - std - fw - 003 FM712 for extended common - mode rs - 485 futurewafer tech co., ltd
applications information figure 3 power derating curve figure 4 capacitance vs.reverse voltage device connection for protectoion of two rs485 data lines eia rs - 485 specifies a + - 7v ground difference between devices on the bus.this permits the bus voltage to range from +12v to - 7v. the FM712 is designed to protect two rs485 data line in extended common mode applications. the FM712 may be used to protect devices from transient voltage resulting from esd,eft,and lightning. the device is designed with asymmetrical operating voltages for optimum protection. the tvs diodes at pins 1 and 2 have a working voltage of 12 volts.these pins are connected to the differential data line pairs. the tvs diodes at pin 3 have a working voltage of 7 volts. pin 3 is connected to ground. the internal tvs diodes of the FM712 will protect the transceiver input from positive transient voltage spikes greater than 12v and negative spikes greater than 7v. a series current limiting resistor may be added in applications requiring enhanced surge immunity. e1506f3c - std - fw - 003 for extended common - mode rs - 485 FM712 futurewafer tech co., ltd
tape&reel information e1506f3c - std - fw - 003 FM712 for extended common - mode rs - 485 futurewafer tech co., ltd
mounting pad package information part no & d? marking code 712 packing 7 reel/3,000pcs ordering information e1506f3c - std - fw - 003 for extended common - mode rs - 485 FM712 futurewafer tech co., ltd futurewafer technology co., ltd ?????? tel +886 - 3 - 3573583/tel +886 - 3 - 3574065 futurewafer.com.tw ?@?@^ 987 50 2 ?
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