EMSA5-FS is a 32-bit, in-order, single-issue, five-stage pipeline processor supporting the open standard RISC-V instruction set architecture (ISA). Its fail-safe features include built-in triple or double modular redundancy (with lockstep), error correction code (ECC) protection of buses, a configurable memory protection unit, privileged operation modes, and Reset and Safety Manager Modules. It is available for ASICs or FPGAs, and as either a stand-alone processor or pre-integrated in optional subsystems combining a bus fabric with typical peripherals.