Support is limited to customers who have already adopted these products. The PS2505-1, -4 and PS2505L-1, -4 are optically coupled isolators containing GaAs light emitting diodes and an NPN silicon phototransistor. The PS2505-1, -4 are in a plastic DIP (Dual In-line Package) and the PS2505L-1, -4 are lead bending type (Gullwing) for surface mount.