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Renesas Electronics R5F51405BDFK#30 — Microcontrollers & Processors (MCU / MPU / DSP)

Renesas R5F51405BDFK#30 RX140 MCU, 48MHz, 128KB Flash

MPNR5F51405BDFK#30
End of Life

Renesas RX140 series, R5F51405BDFK#30, 32-Bit Single-Core MCU, 48MHz, 128KB Flash, 32K x 8 RAM, 8K x 8 EEPROM, 53 I/O, CANbus/I²C/SCI/SPI, 64-LQFP, -40°C to 85°C.

$3.7Ref. price · indicative, final on quote
Renesas Electronics R5F51405BDFK#30 datasheet (PDF)
Packaging64-LQFP
RoHSROHS3 Compliant
SeriesRX140
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

R5F51405BDFK#30 specifications
ParameterValue
SeriesRX140
MountingSurface Mount
Oscillator typeInternal
Program memory typeFLASH
Voltage - supply (Vcc (Vdd))1.8V ~ 5.5V
Operating temperature-40°C ~ 85°C (TA)
Speed48MHz
PackageTray
RAM size32K x 8
Core size32-Bit Single-Core
EEPROM size8K x 8
PeripheralsAES, Capacitive Touch, DMA, LVD, POR, PWM, Temp Sensor, TRNG, WDT
ConnectivityCANbus, I²C, SCI, SPI
Number of i (O)53
Core processorRXv2
Case64-LQFP
Data convertersA/D 15x12b; D/A 2x8b
Program memory size128KB (128K x 8)

Product details

The Renesas R5F51405BDFK#30 is a 32-bit RX140-series microcontroller built around the RXv2 core running at 48 MHz.

Peripheral fit and I/O count

The connectivity block covers CANbus, I²C, SCI (UART), and SPI, so it can talk to most common serial peripherals without external bridge chips. The 15-channel 12-bit ADC and dual 8-bit DAC handle the analog front-end for current sensing or signal conditioning.

It is not automotive-qualified (no AEC-Q100 in the record), so it belongs on the factory floor, not under the hood.

Frequently asked questions

What is the closest functional equivalent to R5F51405BDFK#30?

The R5F51405BGFL#30 is a pin-compatible sibling in the same RX140 series with the same 48 MHz RXv2 core and 128 KB Flash, but it has 39 I/O instead of 53 and operates up to 105°C. For a higher-temperature variant with the same I/O count, the R5F51406AGFM#30 runs to 105°C but omits the AES and TRNG peripherals.

Is R5F51405BDFK#30 compatible with existing RX140 firmware?

Yes, the R5F51405BDFK#30 is a member of the RX140 series and uses the same RXv2 core. Firmware written for other RX140 devices with the same Flash and RAM footprint should port directly, though peripheral and I/O mapping differences (e.g., 53 I/O vs 39 on some siblings) may require pin-configuration changes.