1. High isolation voltage between input and output ( Viso : 5 000V rms ) 2. Low collector dark current ( I CEO : MAX. 6 x 10 - 9 A at V CE = 5V ) 3. Current transfer ratio ( CTR : MIN. 10% at I F = 1mA, V CE = 0.4V ) 4. Compact dual-in-line package 5. Recognized by UL, file No. E64380 High Density .