Well, ST went out of business with the set-top box chips a few years ago, the STiD135 is one of the last remnants. As far as I am informed, the business has not been sold, nor can I offer any alternative. That's why I prefaced my first answer with: "It is with deep regret..." (an ST employee)
p.s. ich sehe gerade, dass die chips noch von easii ic vertrieben werden. damit waere sogar die fbc funktionalitaet mit 8 demodulatoren moeglich gewesen...