No. S/PDIF is a digital protocol for carrying sound, RCA is just a connector.

However you can transfer S/PDIF data via an RCA connector.

The Lynx CBL-XFDR18 S/PDIF Adapter may be the best.

Some but not all Dell computers include an S/PDIF connector as part of the sound card.

S/PDif is a digital communication standard. It stands for Sony/Phillips Digital InterFace.

S/PDIF is a way of digitally sending sound in up to dolby 7.1 digitally, so there's no analogue noise or signal loss. S/PDIF has two interfaces; optical and coaxial. Both are equal in quality, but the optical interface uses a laser and fiber optic cable to transmit the data, whereas the coaxial uses electrical signals.

With S/PDIF, the communication is one direction; in other words, input or output. Many computers today have a S/PDIF out, which can go to a receiver that has a S/PDIF in.

Digital audio stream