PC817XxNSZ1B Series contains an IRED optically coupled to a phototransistor. It is packaged in a 4-pin DIP. Input-output isolation voltage(rms) is 5kV. Collector-emitter voltage is 80V. CTR is 50% to 400% (at IF=5mA,VCE=5V,Ta=25?) ? Features 1.4-pin DIP package 2. Double transfer mold package (Ideal for Flow Soldering) 3. High isolation voltage between input and output (Viso (rms) :5kV) 4. High collector-emitter voltage(VCEO :80V) 5. Current transfer ratio (CTR : MIN. 50% at IF=5 mA, VCE=5V ,Ta=25?) 6. RoHS directive compliant