TLP181 is a Toshiba transistor optocoupler, Toshiba's optocoupler quality is very good, and now the price has been reduced, other alternatives such as NEC?PS2701?Xaipu's PC357?AVAGO's?HCPL-181?These big brands can be...? Relatively inexpensive price of Taiwan's EL357 optical coupler LTV357? These can be, but sometimes can not completely replace, with Toshiba's cost-effective or better. More about some of Toshiba's product introduction can go to the "tide light coupling network"