R5K574M6U4AE#00

The U signature is the RX74M combination for designs that want the family's full CAN FD bandwidth without an EtherCAT segment: the R5K574M6U4AE#00 runs the RXv3e core at the full 600 MHz with 512 KB of code MRAM, 48 KB of data MRAM and 1.5 MB of ECC SRAM, three channels each of CAN and CAN FD, a gigabit Ethernet MAC (10M/100M/1G) and no EtherCAT slave controller, in the 320-ball LFBGA (17 x 17 mm) with full-carton packing. Dropping the unused slave block keeps the network stack and the licensing picture simpler while its CAN FD channels serve modern machine buses at higher data rates. Selection advice: against the in-catalog R5K574M6B4AE#00 - same memory size, package and CAN FD set - this U code is the deliberate no-EtherCAT choice, so take the B code if EtherCAT joins the roadmap; against the T code it is the one that keeps CAN FD. Quote the complete code, as one letter carries the whole interface decision. Parameters verified against Renesas Electronics documentation.