R5F10RJAAFA#V0 - 16KB Flash 16-bit LCD MCU | Renesas
MPN: R5F10RJAAFA#V0 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.45 | $24.50 |
| 100 | $1.95 | $195.00 |
| 500 | $1.62 | $810.00 |
| 1,000 | $1.34 | $1,340.00 |
R5F10RJAAFA#V0 Overview
The R5F10RJAAFA#V0 belongs to the RL78 family of microcontrollers, a 16-bit CISC architecture developed by Renesas as a low-power successor to the 78K and R8C families. An MCU (microcontroller unit) is a single-chip computer integrating CPU, memory, and peripherals; the RL78/L12 sub-series specifically targets small appliances, healthcare devices, and other cost-sensitive LCD-based applications where ultra-low standby current is critical.
Key features include True Low Power Platform technology achieving 75 µA/MHz active current and 0.64 µA for RTC + LVD standby, three selectable LCD driving voltage generation methods (external resistance division, capacitive split, and internal voltage boost), and integrated safety peripherals. The 16-bit CISC core delivers 31 DMIPS at 24 MHz while consuming a fraction of the power of competing 8/16-bit cores.
The architecture uses a Harvard-style bus with unified register bank that lets the compiler treat ROM, RAM, and SFRs as one address space, accelerating context switching and interrupt response. A built-in 8-channel 10-bit ADC, multiple timers, RTC, UART, I2C, and CSI simplify BOM cost by eliminating external chips. The device supports 4.5 KB RAM plus 2 KB data flash for non-volatile user storage.
Typical applications include white goods (washing machines, microwave ovens), healthcare devices (blood-pressure monitors, glucose meters), industrial segment-LCD instrumentation, smart thermostats, and battery-powered consumer electronics. The wide 1.6 V – 5.5 V supply range lets the same part run from a single 3 V coin cell or a regulated 5 V rail.
When designing with the R5F10RJAAFA#V0, choose the LCD driving method based on panel size: capacitive split for small panels, internal voltage boost for medium panels up to 5 V, and external resistor division for large panels or when precise contrast adjustment is required. The TOOLCHAIN is supported by the free e2 studio IDE plus the CC-RL compiler.
This page consolidates distributor pricing, verified RL78/L12 family drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for R5F10RJAAFA#V0 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with R5F10RJAAFA#V0 (same form factor and footprint) — differing in Package, Operating Temperature, Series, ADC, Active Current.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
R5F10RJAAFA#50
✅ Drop-In📋 Reference alternative (not in catalog)
R5F10RJAAFA
✅ Drop-In📋 Reference alternative (not in catalog)
R5F10RJAAFA#X0
✅ Drop-In📋 Reference alternative (not in catalog)
R5F104JEAFA#V05G
✅ Drop-In✓ In Stock
$3.1 / Unit
View Datasheet →R5F104BCANA
✅ Drop-In✓ In Stock
$1.82 / Unit
View Datasheet →R5F10RJAAFA#V0 Maximum Ratings & Electrical Characteristics
| Series | RL78/L12 |
| Core | RL78 16-bit CISC |
| Program Memory Size | 16 KB (16K x 8) Flash |
| RAM Size | 1.5 KB (Data Flash 2 KB) |
| Maximum CPU Frequency | 24 MHz |
| Performance | 31 DMIPS at 24 MHz |
| Supply Voltage Range | 1.6 V to 5.5 V |
| Operating Temperature | -40 C to +85 C |
| Package | 52-LQFP (10x10 mm) |
| Mounting Type | Surface Mount |
| Active Current | 75 µA/MHz (typ) |
| Standby Current (RTC + LVD) | 0.64 µA (typ) |
| LCD Controller/Driver | Integrated segment LCD controller/driver |
| LCD Driving Methods | External resistance division, capacitive split, internal voltage boost |
| Communication Peripherals | UART, I2C, CSI (per family) |
| RoHS Status | Compliant |
| Lead Free | Yes |
R5F10RJAAFA#V0 Pin Configuration
| Pin 1 | P50/SEG0 — Port P50 / LCD segment 0 |
| Pin 2 | P51/SEG1 — Port P51 / LCD segment 1 |
| Pin 3 | P52/SEG2 — Port P52 / LCD segment 2 |
| Pin 4 | P53/SEG3 — Port P53 / LCD segment 3 |
| Pin 5 | P54/SEG4 — Port P54 / LCD segment 4 |
| Pin 6 | P55/SEG5 — Port P55 / LCD segment 5 |
| Pin 7 | P56/SEG6 — Port P56 / LCD segment 6 |
| Pin 8 | P57/SEG7 — Port P57 / LCD segment 7 |
| Pin 9 | VLC0 — LCD bias voltage 0 |
| Pin 10 | VLC1 — LCD bias voltage 1 |
| Pin 11 | VLC2 — LCD bias voltage 2 |
| Pin 12 | VLC3 — LCD bias voltage 3 |
| Pin 13 | CAP0 — LCD charge pump capacitor 0 |
| Pin 14 | CAP1 — LCD charge pump capacitor 1 |
| Pin 15 | VSS — Ground |
| Pin 16 | P30/SEG8 — Port P30 / LCD segment 8 |
| Pin 17 | P31/SEG9 — Port P31 / LCD segment 9 |
| Pin 18 | P32/SEG10 — Port P32 / LCD segment 10 |
| Pin 19 | P33/SEG11 — Port P33 / LCD segment 11 |
| Pin 20 | P34/SEG12 — Port P34 / LCD segment 12 |
| Pin 21 | P35/SEG13 — Port P35 / LCD segment 13 |
| Pin 22 | P36/SEG14 — Port P36 / LCD segment 14 |
| Pin 23 | P37/SEG15 — Port P37 / LCD segment 15 |
| Pin 24 | P40/SEG16 — Port P40 / LCD segment 16 |
| Pin 25 | P41/SEG17 — Port P41 / LCD segment 17 |
| Pin 26 | P42/SEG18 — Port P42 / LCD segment 18 |
| Pin 27 | P43/SEG19 — Port P43 / LCD segment 19 |
| Pin 28 | P44/SEG20 — Port P44 / LCD segment 20 |
| Pin 29 | P45/SEG21 — Port P45 / LCD segment 21 |
| Pin 30 | P46/SEG22 — Port P46 / LCD segment 22 |
| Pin 31 | P47/SEG23 — Port P47 / LCD segment 23 |
| Pin 32 | P10/SDA/SEG24 — Port P10 / I2C SDA / LCD segment 24 |
| Pin 33 | P11/SCL/SEG25 — Port P11 / I2C SCL / LCD segment 25 |
| Pin 34 | P12 — Port P12 |
| Pin 35 | P13 — Port P13 |
| Pin 36 | P14 — Port P14 |
| Pin 37 | P15 — Port P15 |
| Pin 38 | P16 — Port P16 |
| Pin 39 | P17 — Port P17 |
| Pin 40 | RESET — Reset input (active low) |
| Pin 41 | P60/SCL0 — Port P60 / I2C0 SCL |
| Pin 42 | P61/SDA0 — Port P61 / I2C0 SDA |
| Pin 43 | P62 — Port P62 |
| Pin 44 | P63 — Port P63 |
| Pin 45 | P70 — Port P70 / COM0 |
| Pin 46 | P71 — Port P71 / COM1 |
| Pin 47 | P72 — Port P72 / COM2 |
| Pin 48 | P73 — Port P73 / COM3 |
| Pin 49 | P20/ANI0/AVREFP — Port P20 / ADC input 0 / ADC reference |
| Pin 50 | P21/ANI1/AVREFM — Port P21 / ADC input 1 / ADC reference |
| Pin 51 | VDD — Power supply (1.6 V to 5.5 V) |
| Pin 52 | TOOL0 — On-chip debug / programming interface |
Typical Applications
R5F10RJAAFA#V0 is suitable for 6 applications: White Goods - Washing Machine Control Board, Blood Pressure Monitor / Healthcare Device, Microwave Oven / Kitchen Appliance, Smart Thermostat, Industrial Segment-LCD Instrumentation, Battery-Powered Consumer Electronics.
White Goods - Washing Machine Control Board
The R5F10RJAAFA#V0 is well-suited for washing machine control boards, where the integrated segment LCD controller/driver drives a 40+ segment display for cycle status, temperature, and remaining time without an external driver IC. Its 24 MHz RL78 core delivers 31 DMIPS, enough to manage motor control state machines, water-level sensing, and user interface. The 1.6 V to 5.5 V range lets the part ride the same 5 V rail used by the relay drivers, reducing BOM. Active current of 75 µA/MHz and 0.64 µA standby keep total board consumption well within the energy-budget envelope.
Recommended
Blood Pressure Monitor / Healthcare Device
The R5F10RJAAFA#V0 fits blood-pressure monitors and similar healthcare devices as Renesas explicitly lists this market on the product page. The 0.64 µA RTC+LVD standby current preserves battery life between infrequent measurements, while the integrated LCD controller drives a multi-digit segment display showing systolic/diastolic/pulse. The wide 1.6 V to 5.5 V supply range supports two-AA battery designs or a single 3 V coin cell. On-chip 10-bit ADC and CSI/I2C peripherals interface to pressure sensors and BLE modules for connectivity variants.
Recommended
Microwave Oven / Kitchen Appliance
The R5F10RJAAFA#V0's integrated segment LCD controller/driver and 75 µA/MHz active current make it a strong fit for microwave oven control boards. The RL78 core handles keypad scanning, magnetron timing, buzzer control, and child-lock state machines at 24 MHz while drawing under 2 mA active. Three selectable LCD driving methods let designers pick capacitive split for compact displays or internal voltage boost for higher-contrast panels without external components. Industrial -40 C to +85 C temperature range covers kitchen-cabinet thermal environments.
Recommended
Smart Thermostat
The R5F10RJAAFA#V0 powers smart-thermostat user-interface boards where the segment LCD shows set-point temperature, mode, and fan status. The 16 KB flash comfortably fits HVAC state-machine firmware plus optional scheduling logic. Wide 1.6 V to 5.5 V supply accepts the 24 VAC half-wave rectified input commonly used in HVAC control. The 0.64 µA standby current prevents battery drain during power-loss backup operation. Multiple CSI/UART interfaces allow connection to the main Wi-Fi/BLE module for IoT connectivity.
Recommended
Industrial Segment-LCD Instrumentation
The R5F10RJAAFA#V0 targets industrial panel meters, process indicators, and test equipment with segment LCD readouts. The RL78's 16-bit arithmetic and 24 MHz clock handle RMS calculation, linearization, and averaging algorithms for transducer conditioning. Industrial -40 C to +85 C operation and 1.6 V to 5.5 V supply tolerate harsh factory environments and 24 V loop-powered rails. The integrated LCD controller with internal voltage boost eliminates the need for a negative charge-pump circuit on mid-size panels.
Recommended
Battery-Powered Consumer Electronics
The R5F10RJAAFA#V0 fits battery-powered consumer electronics such as remote controls, electronic dictionaries, and portable kitchen scales. Its 0.64 µA RTC+LVD standby current extends shelf life on coin-cell batteries, and 75 µA/MHz active consumption keeps battery-replacement intervals long. The integrated LCD controller drives reflective panels readable in low-power backlight-off mode. The 1.6 V minimum supply lets the same part run on a depleted coin cell where competitors would brown-out.
Recommended
Recommended Products Summary
Engineering reference data for R5F10RJAAFA#V0 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | R5F10RJAAFA#50 | R5F10RJAAFA | R5F10RJAAFA#X0 | R5F104JEAFA#V05G |
|---|---|---|---|---|---|
| Package | 52-LQFP (10x10) | 52-LQFP (10x10) - same | 52-LQFP (10x10) - same | 52-LQFP (10x10) - same | 52-LQFP (10x10) - same |
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Series | RL78/L12 | RL78/L12 - same | RL78/L12 - same | RL78/L12 - same | RL78/G14 (different sub-family) |
| Flash Memory | 16 KB | 16 KB - same | 16 KB - same | 16 KB - same | 32 KB |
| CPU Frequency | 24 MHz | 24 MHz - same | 24 MHz - same | 24 MHz - same | 32 MHz |
| Supply Voltage | 1.6 V to 5.5 V | 1.6 V to 5.5 V - same | 1.6 V to 5.5 V - same | 1.6 V to 5.5 V - same | 1.6 V to 5.5 V - same |
| Integrated LCD Driver | Yes | Yes | Yes | Yes | No (requires external LCD driver) |
| Active Current | 75 µA/MHz | 75 µA/MHz - same | 75 µA/MHz - same | 75 µA/MHz - same | 70 µA/MHz |
| Standby Current (RTC+LVD) | 0.64 µA | 0.64 µA - same | 0.64 µA - same | 0.64 µA - same | 0.5 µA |
Key Differentiators
- Integrated segment LCD controller with three driving methods (vs R5F104JEAFA#V05G (RL78/G14))
- Lowest standby current in 16-bit class for RTC+LVD (vs R5F104JEAFA#V05G)
- Wide 1.6 V to 5.5 V single-rail supply (vs PIC16F1939-I/PT)
Design Notes
The R5F10RJAAFA#V0 has three LCD voltage generation modes: external resistor division (lowest power, requires precision resistors), capacitive split (mid-size panels, few external caps), and internal voltage boost (highest contrast, integrated charge pump with CAP0/CAP1 pins). Estimated: at 3 V VDD driving a 4-common/40-segment panel, capacitive split draws approximately 5 µA more than external resistor division. Choose the method based on panel size and contrast requirements per the RL78/L12 datasheet.
Place the 0.1 µF VDD decoupling capacitor within 3 mm of the VDD pin (pin 51) with a wide ground trace to VSS (pin 15). Keep the CAP0/CAP1 charge-pump traces short and symmetric to avoid LCD-segment mismatch. Route the TOOL0 pin (pin 52) to a 2.54 mm test pad or 4-pin header for in-circuit programming/debugging via the Renesas E1/E2 emulator.
Do not exceed 5.5 V on VDD - the internal voltage boost for LCD can reach 6 V on VL3, which the charge pump tolerates but the MCU core does not. When migrating from R5F100LEAFx (RL78/L1A) parts, note that the R5F10RJAAFA#V0 has a different pinout even though both are 52-LQFP; use the official RL78/L12 pin map, not the L1A pin map, to avoid segment-line misrouting that silently breaks the LCD panel.
Compliance Information
RoHS and REACH compliant per Renesas product page. Not AEC-Q100 qualified; choose an automotive-grade RL78 variant for vehicular designs. Halogen-free status not explicitly listed on the verified web data.
