24MHz RL78 core with 12KB flash in a 20-LSSOP footprint
The R5F10369ASM#55 is a 16-bit RL78/G12 microcontroller from Renesas, clocked at 24MHz with 12KB of on-chip flash and 1KB of RAM. The 20-LSSOP package (4.40mm width) keeps the board footprint small while providing 14 general-purpose I/O pins for sensor interfacing and control tasks. Supply voltage spans 1.8V to 5.5V, so the part can run directly off a 3.3V or 5V rail without an external regulator in many designs.
12KB flash and 1KB RAM — firmware budget check
With 12KB of program flash and 1KB of SRAM, the R5F10369ASM#55 targets lightweight sensor nodes, simple control loops, and communication bridges. The 11-channel 8/10-bit ADC and serial interfaces (CSI, I²C, UART/USART) are typical for reading temperature, pressure, or proximity sensors and reporting over a bus. Compared to the RL78/G14 sibling R5F104BEGFP#10, which runs at 32MHz and offers 25 I/O in a larger package, the G12 trades top-end speed and pin count for a smaller footprint and lower system cost. The G1M variant R5F11W67ASM#10 runs at 20MHz with 16 I/O but lacks I²C and the full ADC resolution — the G12 sits between them for balanced connectivity.
For volume pricing and lead time, submit an RFQ against your BOM quantity.
20-LSSOP layout and supply decoupling
Place a 0.1µF ceramic cap close to each VDD/VSS pair; the wide 1.8V–5.5V supply range means the regulator output tolerance is less critical. If an external clock is used, the oscillator input is on a dedicated pin — check the pin assignment in the hardware manual before layout.