TOSHIBA Photocoupler IRED & Photo-Transistor TLP184 Telephone Use Equipment Programmable Controllers AC/DC-Input Module Telecommunication TLP184 Unit: mm The TOSHIBA mini flat coupler TLP184 is a small outline coupler, suitable for surface mount assembly. TLP184 consist of a photo transistor, optically coupled to two infrared emitting diodes connected inverse parallel, and can operate directly by AC input current. Collector-emitter voltage: 80 V (min) Current transfer rati.