32-bit RX core with integrated capacitive touch and 512 KB Flash
The Renesas R5F51308AGNE#20 is a 32-bit RX-series microcontroller from the RX130 family, built around a single-core RX CPU running at 32 MHz. It packs 512 KB of Flash program memory, 48 KB of SRAM, and 8 KB of on-chip EEPROM, along with a 10-channel 12-bit ADC and a full set of peripherals including capacitive touch sensing, DMA, LVD, POR, PWM, and WDT. Connectivity covers I²C, LINbus, SCI, and SPI. The device operates from 1.8 V to 5.5 V over the industrial temperature range of -40°C to 105°C, making it suitable for factory automation, motor drives, outdoor telecom, and HMI panels that need touch-button interfaces without an external controller.
Memory headroom and the EEPROM advantage
The 512 KB Flash and 48 KB RAM place this MCU in the mid-range tier of the RX130 family — enough for a real-time control loop with a modest stack, a touch-sensing library, and a communication protocol stack. The 8 KB EEPROM is a genuine hardware EEPROM (not emulated in Flash), so calibration constants, configuration parameters, and production serial numbers can be written byte-by-byte without wear-leveling overhead or sector-erase delays. That saves a separate serial EEPROM on the BOM.
Package and layout notes for the 48-WFQFN
The device comes in a 48-WFQFN with an exposed pad (7x7 mm). The exposed pad must be soldered to a ground-plane via array for thermal relief.
Lifecycle and sourcing
R5F51308AGNE#20 carries an Active lifecycle status with ROHS3 compliance. No end-of-life notice or last-time-buy window is in effect, so it remains a safe choice for new designs and production builds.