... silicon phototransistor. 2. Lead pitch 2.54mm. 3.RoHs approval. PC817 4pin photocoupler Features:1.Current transfer ratio (CTR:MIN. 50 ... ,000Vrms)3.Response time(tr:TYP. 4us at Vce=2V, Ic=2mA, Rl=100)4.UL, CSA, VDE, TUV, FIMKO, NEMKO ... more you buy, the cheaper it is!Welcome your enquiry!!! PC817 4pin optical coupler