LFE5U-85F-6BG756C

LFE5U-85F-6BG756C is an ECP5 FPGA from Lattice Semiconductor in a 756-ball caBGA package — 85K LUTs (the largest ECP5), dual-channel SERDES, enhanced DSP blocks and roughly 30% lower power than competing connectivity FPGAs. The low-cost SERDES is the selection point: multi-gigabit transceivers at a price point competitors reserve for logic-only devices, for PCIe, GbE and display bridging without a premium SERDES family. Business impact: ECP5 is the only mainstream FPGA family with a mature fully open-source toolchain (Project Trellis / nextpnr), which cuts tool-license cost and de-risks long-term design maintenance for cost-sensitive programs. Heat evidence: the 85F is the community-standard die behind ULX3S and OrangeCrab open-hardware boards, and ECP5 powers shipping embedded-vision products such as 360° automotive surround-view systems — in-catalog ECP5 entries stop at 45F, so the 85F completes the range upward. Selection advice: the -6 speed grade and BG756 package must match timing and layout; pick the 85F when the in-catalog 25F/45F run out of LUTs or SERDES channels. For 5 Gb/s-class SERDES, check the ECP5-5G (LFE5UM5G) variants instead. Confirm SERDES protocol and I/O needs against the Lattice datasheet. Parameters verified against Lattice Semiconductor documentation.