Catalog > Semiconductors > Opto-Electronic Components > Opto Couplers 4 Channel Photo Transistor Opto Isolator 4 Channel Photo Transistor Opto Isolator TLP521-4GB QUAD OPTO COUPLER Call for Price Add Specifications, Prices & Availability may change without notice. Images are for illustration purposes only. E&OE Additional Information Model TLP521-4GB Current Transfer Ratio 0.06% Isolation Voltage 5.3kV Collector to Emitter Voltage 55V Package 16 Pin DIP