An application note on Vishay’s electro-pyrotechnic resistor chip made from thin film technology. Link here (PDF)
In this paper we will show how the EPIC’s thin film construction is unique in providing pyrotechnic engineers with outstanding performances in terms of firing energy, firing time, reproducibility and reliability, easy set up, no fire/all fire ratio, assembly, versatility, etc.
I wonder how hard these are to buy? I can see that they may be considered a regulated component, and kept from the community.