isocom components ltd unit 25b, park view road west, park view industrial estate, brenda road hartlepool, cleveland, ts25 1ud tel: (01429) 863609 fax :(01429) 863581 high density mounting phototransistor optically coupled isolators description the is357 is an optically coupled isolator consisting of an infrared light emitting diode and npn silicon photo transistor in a space efficient dual in line plastic package. features z marked as fpt1. z current transfer ratio min. 50% z isolation voltage (3.75kv rms ,5.3kv pk ) z all electrical parameters 100% tested z drop in replacement for sharp pc357 applications z computer terminals z industrial systems controllers z measuring instruments z signal transmission between systems of different potentials and impedances is357 27/11/08 dimensions in mm db92845 3.85+-0.3
absolute maximum ratings (25c unless otherwise specified) storage temperature -55c to + 150c operating temperature -55c to + 100c lead soldering temperature (1/16 inch (1.6mm) from case for 10 secs) 260c input diode forward current 50ma reverse voltage 6v power dissipation 70mw output transistor collector-emitter voltage bv ceo 35v emitter-collector voltage bv eco 6v collector current 50ma power dissipation 150mw power dissipation total power dissipation 170mw (derate linearly 2.26mw/ c above 25c) parameter min typ max units test condition input forward voltage (v f ) 1.2 1.4 v i f = 20ma reverse current (i r )10 av r = 4v output collector-emitter breakdown (bv ceo )35 v i c = 0.5ma emitter-collector breakdown (bv eco ) 6 v i e = 0.1ma collector-emitter dark current (i ceo ) 100 n a v ce = 20v coupled current transfer ratio (ctr) 50 600 % 5ma i f , 5v v ce optional ctr grades: is357a 80 160 % 5ma i f , 5v v ce IS357B 130 260 % 5ma i f , 5v v ce is357c 200 400 % 5ma i f , 5v v ce is357d 300 600 % 5ma i f , 5v v ce collector-emitter saturation voltagev ce (sat) 0.2 v 20ma i f , 1.0ma i c input to output isolation voltage v iso 3750 v rms see note 1 5300 v pk see note 1 input-output isolation resistance r iso 5x10 10 v io = 500v (note 1) output rise time tr 4 18 sv ce = 2v , output fall time tf 3 18 si c = 2ma, r l = 100 electrical characteristics ( t a = 25c unless otherwise noted ) note 1 measured with input leads shorted together and output leads shorted together. db92845 27/11/08
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