R5F10WLGAFB - RL78/L13 16-Bit 128KB Flash MCU | Renesas
MPN: R5F10WLGAFB ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.46 | $6.46 |
| 10 | $5.78 | $57.80 |
| 100 | $5.12 | $512.00 |
| 500 | $4.55 | $2,275.00 |
| 1,000 | $4.02 | $4,020.00 |
R5F10WLGAFB Overview
An MCU (microcontroller unit) is a single-chip computer that integrates a CPU core, non-volatile memory (flash/ROM), volatile memory (RAM), and a rich set of peripheral interfaces such as timers, ADCs, communication controllers, and—on RL78/L13—a segment LCD driver. The RL78 family sits within Renesas's low-power 16-bit MCU portfolio, which is widely adopted in metering, white goods, healthcare devices, and other segment-LCD applications that demand years of battery life.
The RL78/L13 supports three LCD driving voltage generation methods: external resistance division, capacitive split mode, and an internal voltage boost, enabling compatibility with a wide range of segment LCD panels. The device also integrates multiple low-power modes, a 12-bit A/D converter, and serial interfaces such as UART, I2C, and CSI, while achieving current consumption in the microamp range during LCD display operation.
Architecturally, the RL78 core uses a 3-stage pipelined CISC-style design with banking of register pages, achieving high code density and very low active current (typically sub-mA/MHz). The integrated LCD controller can drive up to a large number of segments, offloading display refresh from the CPU and enabling deep-sleep LCD retention. Operating voltage spans 1.6 V to 5.5 V with on-chip regulators, supporting direct connection to 2x or 3x AA/AAA cells or a single lithium primary cell.
Typical applications include home appliances with segment LCDs (washing machines, microwave ovens, air conditioners), utility meters (water/gas/electricity), medical measurement devices (blood pressure monitors, glucose meters), and industrial sensor readouts. The combination of segment LCD driver and ultra-low-power run mode positions the RL78/L13 as a strong fit for battery-powered human-machine interface designs.
When designing with this device, evaluate the maximum segment count of your target panel against the LCD controller's SEG/COM allocation, and confirm that the 24 MHz system clock and 128 KB flash budget are sufficient for your application code. For metering or measurement applications requiring higher ADC precision or larger memory, consider migrating to the RL78/L1A or RL78/G14 family.
This page synthesizes distributor pricing, RL78/L13 family alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for R5F10WLGAFB — 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 R5F10WLGAFB (same form factor and footprint) — differing in A/D Converter, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
R5F10WLEAFB
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
R5F10WLCGFB
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
R5F10WLGAFB#30
✅ Drop-In✓ In Stock
$1.94 / Unit
View Datasheet →R5F10WLGAFB#50
✅ Drop-In📋 Reference alternative (not in catalog)
R5F10WLGAFB#V0
✅ Drop-In📋 Reference alternative (not in catalog)
R5F10WLGAFB#YW
✅ Drop-In📋 Reference alternative (not in catalog)
R5F10WLGAFB Maximum Ratings & Electrical Characteristics
| Product Family | RL78/L13 |
| CPU Core | RL78 (16-bit CISC) |
| Maximum CPU Frequency | 24 MHz |
| Program Flash Memory | 128 KB (128K x 8) |
| Package | 64-LFQFP (10x10 mm) |
| Pin Count | 64 |
| Operating Voltage | 1.6 V to 5.5 V |
| Operating Temperature | -40 C to +85 C |
| Segment LCD Driver | Yes (external resistance / capacitive split / internal voltage boost) |
| Serial Interfaces | UART, I2C, CSI |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
R5F10WLGAFB Pin Configuration
| Pin 1 | P137/SEG38 — GPIO / Segment LCD output 38 |
| Pin 2 | P40/SEG39 — GPIO / Segment LCD output 39 |
| Pin 3 | P41/SEG40 — GPIO / Segment LCD output 40 |
| Pin 4 | P42/SEG41 — GPIO / Segment LCD output 41 |
| Pin 5 | P43/SEG42 — GPIO / Segment LCD output 42 |
| Pin 6 | P44/SEG43 — GPIO / Segment LCD output 43 |
| Pin 7 | P45/SEG44 — GPIO / Segment LCD output 44 |
| Pin 8 | P46/SEG45 — GPIO / Segment LCD output 45 |
| Pin 9 | P47/SEG46 — GPIO / Segment LCD output 46 |
| Pin 10 | VSS — Ground |
| Pin 11 | VDD — Positive power supply |
| Pin 12 | RESET — Reset input (active low) |
| Pin 13 | P50/AN0 — GPIO / Analog input 0 |
| Pin 14 | P51/AN1 — GPIO / Analog input 1 |
| Pin 15 | P52/AN2 — GPIO / Analog input 2 |
| Pin 16 | P53/AN3 — GPIO / Analog input 3 |
| Pin 17 | P54/AN4 — GPIO / Analog input 4 |
| Pin 18 | P55/AN5 — GPIO / Analog input 5 |
| Pin 19 | P56/AN6 — GPIO / Analog input 6 |
| Pin 20 | P57/AN7 — GPIO / Analog input 7 |
| Pin 21 | AVSS — Analog ground |
| Pin 22 | AVDD — Analog power supply |
| Pin 23 | P60/COM0 — GPIO / LCD common output 0 |
| Pin 24 | P61/COM1 — GPIO / LCD common output 1 |
| Pin 25 | P62/COM2 — GPIO / LCD common output 2 |
| Pin 26 | P63/COM3 — GPIO / LCD common output 3 |
| Pin 27 | P64/COM4 — GPIO / LCD common output 4 |
| Pin 28 | P65/COM5 — GPIO / LCD common output 5 |
| Pin 29 | P66/COM6 — GPIO / LCD common output 6 |
| Pin 30 | P67/COM7 — GPIO / LCD common output 7 |
| Pin 31 | P70/SEG0 — GPIO / Segment LCD output 0 |
| Pin 32 | P71/SEG1 — GPIO / Segment LCD output 1 |
| Pin 33 | P72/SEG2 — GPIO / Segment LCD output 2 |
| Pin 34 | P73/SEG3 — GPIO / Segment LCD output 3 |
| Pin 35 | P74/SEG4 — GPIO / Segment LCD output 4 |
| Pin 36 | P75/SEG5 — GPIO / Segment LCD output 5 |
| Pin 37 | P76/SEG6 — GPIO / Segment LCD output 6 |
| Pin 38 | P77/SEG7 — GPIO / Segment LCD output 7 |
| Pin 39 | P30/RXD0 — GPIO / UART0 receive |
| Pin 40 | P31/TXD0 — GPIO / UART0 transmit |
| Pin 41 | P32/INTP0 — GPIO / External interrupt 0 |
| Pin 42 | P33/INTP1 — GPIO / External interrupt 1 |
| Pin 43 | P34/INTP2 — GPIO / External interrupt 2 |
| Pin 44 | P35/INTP3 — GPIO / External interrupt 3 |
| Pin 45 | P10/SCL0 — GPIO / I2C clock |
| Pin 46 | P11/SDA0 — GPIO / I2C data |
| Pin 47 | P12/TOOL0 — GPIO / On-chip debug data |
| Pin 48 | P13/TOOL1 — GPIO / On-chip debug clock |
| Pin 49 | P14/SSI00 — GPIO / Serial interface 0 clock |
| Pin 50 | P15/SSI01 — GPIO / Serial interface 0 receive |
| Pin 51 | P16/SSI02 — GPIO / Serial interface 0 transmit |
| Pin 52 | P17/SSI03 — GPIO / Serial interface 0 chip select |
| Pin 53 | P20/TI00 — GPIO / Timer input 0 |
| Pin 54 | P21/TO00 — GPIO / Timer output 0 |
| Pin 55 | P22/TI01 — GPIO / Timer input 1 |
| Pin 56 | P23/TO01 — GPIO / Timer output 1 |
| Pin 57 | P24/TI10 — GPIO / Timer input 10 |
| Pin 58 | P25/TO10 — GPIO / Timer output 10 |
| Pin 59 | P26/TI11 — GPIO / Timer input 11 |
| Pin 60 | P27/TO11 — GPIO / Timer output 11 |
| Pin 61 | P00/SEG8 — GPIO / Segment LCD output 8 |
| Pin 62 | P01/SEG9 — GPIO / Segment LCD output 9 |
| Pin 63 | P02/SEG10 — GPIO / Segment LCD output 10 |
| Pin 64 | P03/SEG11 — GPIO / Segment LCD output 11 |
Typical Applications
R5F10WLGAFB is suitable for 6 applications: Utility Water/Gas/Electricity Meters, Home Appliance Segment LCD Displays, Medical Measurement Devices, Industrial Sensor Readouts, HVAC Thermostats and Climate Controllers, Portable Health and Fitness Devices.
Utility Water/Gas/Electricity Meters
The R5F10WLGAFB is an ideal core for residential and industrial utility meters that must display cumulative consumption on a multi-digit segment LCD for 10+ years on a single battery. Its RL78 core delivers sub-mA/MHz active current and the integrated segment LCD driver operates in deep-sleep retention mode, drawing only microamps to maintain display. The 128 KB flash accommodates metrology firmware, anti-tamper logic, and wireless M-Bus or LoRaWAN stacks. With 1.6-5.5 V operation, the device pairs directly with a single lithium primary cell, eliminating boost circuitry and reducing BOM cost in high-volume meter deployments.
Recommended
Home Appliance Segment LCD Displays
The R5F10WLGAFB targets white-goods and kitchen appliances with built-in segment LCDs, including washing machines, microwave ovens, rice cookers, and air conditioners. Its segment LCD controller supports three driving methods (external resistance division, capacitive split, internal voltage boost), enabling compatibility with virtually any panel supplier. The 24 MHz CPU can drive real-time UI logic for mode selection, timer/countdown, and sensor-driven control loops, while the integrated timers support motor PWM and inverter interfaces. The 64-LFQFP package provides ample I/O for keypad scanning, rotary encoders, and relay control outputs typical of major appliance designs.
Recommended
Medical Measurement Devices
Battery-powered medical measurement devices such as blood pressure monitors, body-thermometers, and glucose meters benefit from the R5F10WLGAFB's ultra-low-power operation and integrated segment LCD for direct numeric readout. The RL78 core's deterministic interrupt latency ensures accurate timing of pulse measurements and sensor acquisitions, while the 12-bit ADC digitizes analog sensor signals with low noise. The 128 KB flash supports full measurement firmware, calibration tables, and historical data logging to internal EEPROM. The 1.6 V minimum supply enables operation from a single alkaline or lithium AA cell, critical for portable medical devices that must comply with IEC 60601-1 for years of battery life.
Recommended
Industrial Sensor Readouts
Industrial 4-20 mA loop-powered transmitters, environmental monitors, and field sensor readouts with local LCD indicators use the R5F10WLGAFB to combine sensor signal conditioning, communication, and display refresh in a single chip. The integrated 12-bit ADC handles analog sensor inputs directly, while the UART/SPI/I2C interfaces drive external digital sensors and fieldbus transceivers. The segment LCD shows real-time values, units, and alarm states without external driver ICs, reducing PCB footprint and BOM. The -40 to +85 C operating range supports harsh industrial environments including outdoor enclosures and process-plant mounting.
Recommended
HVAC Thermostats and Climate Controllers
Programmable thermostats and climate controllers use the R5F10WLGAFB to drive multi-segment LCDs showing temperature, humidity, mode, and schedule data, while running the PID control loop for HVAC actuators. The segment LCD's deep-sleep retention mode keeps the display visible when the rest of the system is sleeping, and the integrated low-power timers wake the MCU periodically for scheduled temperature sampling. The 128 KB flash accommodates weather-adaptive scheduling algorithms, while UART/I2C interfaces connect to wireless modules (Wi-Fi/Zigbee/BLE) for cloud-connected thermostats and room controllers.
Recommended
Portable Health and Fitness Devices
Battery-powered step counters, calorie trackers, and basic fitness wearables with segment LCD displays use the R5F10WLGAFB for its ultra-low active current and integrated display controller. The device can drive pedometer, accelerometer interface, and stopwatch functions while maintaining a sub-microamp deep-sleep current when the user is not interacting. The 24 MHz CPU easily handles step-counting algorithms and history buffering to data flash. With 1.6 V minimum supply, the MCU pairs directly with coin-cell batteries, enabling small-form-factor wearables with multi-month battery life.
Recommended
Recommended Products Summary
Engineering reference data for R5F10WLGAFB — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | R5F10WLEAFB | R5F10WLCGFB | R5F10WLGAFB#30 |
|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Package | 64-LFQFP (10x10 mm) | 64-LFQFP (10x10 mm) - same | 64-LFQFP (10x10 mm) - same | 64-LFQFP (10x10 mm) - same |
| Program Flash | 128 KB | 192 KB | 32 KB | 128 KB |
| CPU Frequency | 24 MHz | 24 MHz | 24 MHz | 24 MHz |
| Operating Voltage | 1.6 V to 5.5 V | 1.6 V to 5.5 V | 1.6 V to 5.5 V | 1.6 V to 5.5 V |
| Segment LCD Driver | Yes (3 driving methods) | Yes (3 driving methods) | Yes (3 driving methods) | Yes (3 driving methods) |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| Lifecycle Status | Active | Active | Active | Obsolete |
Key Differentiators
- 3-mode segment LCD driver (vs R5F10WLCGFB)
- 128 KB flash with RL78/L13 LCD integration (vs R5F10WLCGFB)
- Active production status vs legacy suffix (vs R5F10WLGAFB#YW)
Design Notes
Estimated: at 24 MHz active mode, the RL78/L13 core draws approximately 1-2 mA per MHz (sub-mA/MHz typical). Battery life for a metering design running 1 ms active per second from a 2.4 Ah lithium cell can exceed 10 years. Place a 0.1 uF decoupling capacitor within 5 mm of each VDD/VSS pair, and a 10 uF bulk capacitor near the MCU. For the analog supply (AVDD/AVSS), add a ferrite bead in series and a dedicated 0.1 uF bypass capacitor to reduce ADC switching noise. The internal voltage boost for LCD operation generates VLCD from VDD and should have a 1 uF capacitor on the VLCD pin.
The 64-LFQFP package has a 0.5 mm lead pitch and requires careful PCB layout to avoid solder bridges. Use NSMD (Non-Solder Mask Defined) pads with a 0.2-0.25 mm pad-to-pad gap, and route signals on inner layers to keep the outer layer as continuous copper pour for thermal dissipation. The exposed thermal pad (if present) should be soldered to a ground pour with thermal vias (5-9 vias in a 3x3 grid) to reduce theta-JA by 30-50%. Keep the crystal/oscillator traces short (under 10 mm) and guarded by a ground ring to minimize EMI.
When migrating firmware between R5F10WLGAFB and R5F10WLCGFB, the linker script must be re-validated because the smaller 32 KB flash on the WLCGFB requires careful ROM/RAM partitioning. Also, do not assume the suffix variant (#10 vs #30 vs #50) has identical fuse settings - always verify the option bytes against the latest Renesas hardware manual. For battery-powered designs, configure unused GPIO pins as analog inputs (set to high-impedance) rather than outputs, since floating outputs can leak 1-5 uA each.
Compliance Information
Standard industrial-grade MCU; not AEC-Q100 qualified. For automotive metering applications requiring AEC-Q100, contact Renesas for RL78/L1A automotive-grade variants.
