Features
- 32MHz Arm Cortex-M23 core
- 16KB flash and 2KB SRAM
- Wide voltage range of 1.6V to 5.5V
- TAU (16-bit general PWM timer)
- TML32 (32-bit interval timers)
- 10-bit A/D converter
- Temperature sensor
- SAU (UART, Simple SPI, Simple I2C)
- I2C bus
- Safety functions
- +-1% high-accuracy high-speed on-chip oscillator
- Best-in-class HAL driver code
- Supports Arm ecosystem and Renesas original development tools
Description
The RA0E3 is a cost‑effective, entry‑level general‑purpose microcontroller (MCU) designed for low‑pin‑count applications that demand simplicity, efficiency, and reliable performance. Built on the Arm® Cortex®‑M23 core, the RA0E3 delivers ultra‑low power consumption, streamlined peripherals, and an architecture optimized to reduce BOM cost and accelerate development for the low-end MCU market.
Offering 16KB of flash, 2KB SRAM, and a wide operating voltage range of 1.6V to 5.5V, the RA0E3 provides a flexible platform for compact, power‑conscious designs. Its robust ‑40°C to 125°C operating temperature range makes it ideal for consumer, industrial, and IoT environments that require dependable performance in challenging conditions.
Parameters
| Attributes | Value |
|---|---|
| Main CPU | Arm Cortex-M23 |
| Program Memory (KB) | 16 |
| RAM (KB) | 2 |
| Carrier Type | Magazine, Tape & Reel |
| Supply Voltage (V) | 1.6 - 5.5 |
| I/O Ports | 17 |
| DRAM I/F | No |
| 3D GPU | No |
| Temp. Range (°C) | Ta= -40 to +125 |
| Ethernet speed | No |
| Ethernet (ch) | 0 |
| EtherCat (ch) (#) | 0 |
| USB FS (host ch/device ch) | ( 0 / 0 ) |
| USB HS (host ch/device ch) | ( 0 / 0 ) |
| USB SS (host ch/device ch) | ( 0 / 0 ) |
| PCI Express (generation and ch) | No |
| SCI or UART (ch) | 2 |
| SPI (ch) | 2 |
| I2C (#) | 3 |
| CAN (ch) | 0 |
| CAN-FD (ch) | 0 |
| Wireless | No |
| SDHI (ch) | 0 |
| High Resolution Output Timer | No |
| PWM Output (pin#) | 7 |
| 32-Bit Timer (ch) | 0 |
| 16-Bit Timer (ch) (#) | 8 |
| 8-Bit Timer (ch) | 0 |
| Standby operable timer | Yes |
| Asynchronous General Purpose Timer / Interval Timer (ch) | 1 |
| 16-Bit A/D Converter (ch) | 0 |
| 14-Bit A/D Converter (ch) | 0 |
| 12-Bit A/D Converter (ch) | 0 |
| 10-Bit A/D Converter (ch) | 6 |
| 24-Bit Sigma-Delta A/D Converter (ch) | 0 |
| 16-Bit D/A Converter (ch) | 0 |
| 12-Bit D/A Converter (ch) | 0 |
| 10-Bit D/A Converter (ch) (#) | 0 |
| 8-Bit D/A Converter (ch) | 0 |
| Capacitive Touch Sensing Unit (ch) | 0 |
| Graphics LCD Controller | No |
| MIPI Interfaces (DSI) (ch) | 0 |
| MIPI Interfaces (CSI) (ch) | 0 |
| Image Codec | No |
| Segment LCD Controller | No |
| Security & Encryption | Unique ID |
Package Options
| Pkg. Type | Pkg. Dimensions (mm) | Lead Count (#) | Pitch (mm) |
|---|---|---|---|
| TSSOP | 6.5 x 4.4 x 1.2 | 20 | 0.65 |
Application Block Diagrams
 | Heatstroke Prevention Watch A low-power wearable detects heatstroke risks and alerts users to take early action. |
 | Household Water Pump Smart water pump system with low power use, noise reduction, and enhanced safety for efficient operation. |
Additional Applications
- Consumer electronics
- System control for small appliances
- Industrial system control
- Building automation
Complete Your Design
Explore complementary products to elevate your design
Renesas Boards & Kits
RA0E3 Fast Prototyping Board
The RA0E3 Fast Prototyping Board features the RA0E3 MCU and provides a streamlined evaluation board for evaluating and developing prototypes across a wide range of applications. It includes a built‑in SEGGER J-Link™ emulator, enabling easy programming and debugging without requiring additional... Read More
Partner Boards & Kits
eStorm-C2 10 Inch Instrument Cluster Design Based on RH850
NEW
RH850 Microcontroller Evaluation Board
NEW
Traction Inverter / Motor Controller
NEWWe’ll guide first‑time users of the RA family through installing a development environment, generating a project, and checking basic operation using the RA0E1 Fast Prototyping Board. The board paired with a J‑Link ARM debugger is used as the practical example to help new developers get started quickly and confidently.
Events & Webinars
News & Blog Posts
Blog Post
Mar 3, 2026
|
Blog Post
Oct 13, 2022
|
Blog Post
Jan 28, 2022
|
Support Communities
-
Softwareupdates on RA0E3
Hello everybody, i want to run a minimal application, but need to be able to update it. Has anyone experience in updating the ra0e3 processor over uart, especially experience how much RAM would be left for the application. The usage of fsp is not an option, because then the application ...
Apr 15, 2026
Support Communities
Knowledge Base
