My Inquiry
My Account
Renesas R5F21237JFP#U1
- Part No.:
- R5F21237JFP#U1
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
R5F21237JFP#U1.pdf
- Description:
- IC MCU 16BIT 48KB FLASH 48LFQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,460
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
R5F21237JFP#U1 from Renesas Electronics is a 16-bit R8C/23 Group microcontroller with CAN 2.0B interface, 48 KB program flash, 2.5 KB RAM, and 1 KB × 2 data flash-designed for automotive and industrial networking applications requiring deterministic real-time control, embedded diagnostics, and fault-tolerant communication. It operates at up to 20 MHz (50 ns min. instruction time) across −40°C to +85°C, housed in a 48-pin LQFP (PLQP0048KB-A).
For engineers reviewing the R5F21237JFP#U1 datasheet, R5F21237JFP#U1 pinout, R5F21237JFP#U1 application, or R5F21237JFP#U1 equivalent, this page delivers verified technical context, validated pin functions, confirmed peripheral capabilities (CAN, LIN, UART, 12-channel 10-bit ADC), and precise alternative-part comparisons-enabling rapid selection for in-vehicle ECUs, factory automation controllers, and safety-critical embedded systems.
Technical Context
The R5F21237JFP#U1 implements the R8C CPU core with 89 fundamental instructions and a 1 Mbyte unified address space. Its memory architecture integrates 48 KB of program flash (1,000 erase/write cycles), 2.5 KB of SRAM, and dual 1 KB data flash blocks (10,000 cycles) for nonvolatile parameter storage-enabling field-upgradable firmware and runtime calibration data retention without external EEPROM.
Peripheral integration includes one CAN 2.0B controller (16 message slots), hardware LIN module (using Timer RA and UART0), two UARTs, I²C bus interface, three 8-bit timers (RA/RB), two 16-bit timers (RD), one compare-match timer (RE), and a 12-channel 10-bit A/D converter-all mapped to 41 general-purpose I/O pins and supported by on-chip oscillators (high-speed adjustable, low-speed), voltage detection, and power-on reset circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | R8C 16-bit CISC core with 89 instructions and 50 ns min. execution time at 20 MHz |
| Flash Memory | 48 KB program ROM (1,000 erase cycles) + 2 KB data flash (10,000 cycles) for runtime parameter storage |
| RAM | 2.5 KB on-chip SRAM for stack, variables, and interrupt handling |
| Operating Voltage | 3.0 V to 5.5 V at 20 MHz; supports single-supply operation without level shifters |
| Temperature Range | −40°C to +85°C (J version); qualified for automotive cabin and industrial control environments |
| Peripherals | 1× CAN 2.0B, 1× LIN, 2× UART, I²C, 12-channel 10-bit ADC, 5 timer modules, watchdog |
| Package | 48-pin LQFP (PLQP0048KB-A), 7 mm × 7 mm, 0.5 mm pitch-compatible with standard SMT reflow profiles |
Pinout & Package
Package: 48-pin plastic LQFP (PLQP0048KB-A), 7 mm × 7 mm body, 0.5 mm lead pitch, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P0_0–P0_7 | Analog input / GPIO | 12-channel 10-bit ADC inputs (AN0–AN7) + configurable CMOS I/O with pull-up control |
| P1_0–P1_7 | GPIO / KI / UART / INT | Key interrupt inputs (KI0–KI3), UART0 TXD0/RXD0, INT1, CLK0, TRAIO-supports wake-up and low-power sensing |
| P2_0–P2_7 | Timer RD I/O | 8-bit bidirectional ports for Timer RD input capture/output compare (TRDIOA0–TRDIOD1, TRDCLK) |
| P3_0, P3_1, P3_3–P3_7 | GPIO / I²C / CAN / SSI | SSCK/SSI/SCS/SDA/SCL (I²C), SSO (serial I/O), TRAO/TRBO (Timer RA/RB outputs), CTX0/CRX0 (CAN TX/RX) |
| P4_2, P4_3, P4_4, P4_5, P4_6, P4_7 | VREF / GPIO / XIN / RESET / MODE | VREF reference input, INT0, RESET (active-low), MODE (boot configuration), XIN/XOUT (oscillator interface) |
| P6_0–P6_7 | TREO / UART1 / INT / GPIO | TREO (clock output), UART1 TXD1/RXD1, INT2/INT3, general-purpose I/O with interrupt capability |
Key Features
| Feature | Design Value |
|---|---|
| Dual data flash blocks | 2 KB (1 KB × 2) with 10,000 erase/write cycles enables robust firmware parameter storage and over-the-air update logging |
| Integrated CAN 2.0B controller | 16-message slot hardware FIFO and acceptance filtering reduce CPU overhead in automotive network nodes |
| Hardware LIN module | Single-channel LIN 2.x compliant implementation using UART0 and Timer RA-no software bit-banging required |
| On-chip clock generation | High-speed oscillator with frequency adjustment + low-speed oscillator + XIN/XOUT support-eliminates need for external crystals in cost-sensitive designs |
| 12-channel 10-bit ADC | Simultaneous sampling not supported, but configurable trigger sources (timer, software) enable precise sensor monitoring in motor control and battery management |
| Interrupt priority levels | 7-level nested interrupt system with IPL register allows deterministic response timing for safety-critical ISRs |
Applications
| Automotive Body Control Module | Industrial PLC I/O Subsystem |
|---|---|
Use Scenario: Centralized control of door locks, window lifts, lighting, and HVAC actuators in passenger vehicles. IC Role / Device Role / Timing Role: Primary MCU executing CAN-based command arbitration, LIN-sensor polling, and PWM-driven actuator control with sub-100 µs interrupt latency. Use Value: Integrated CAN/LIN eliminates external transceivers; data flash stores vehicle-specific calibration and fault logs across power cycles. |
Use Scenario: Distributed I/O expansion node in modular programmable logic controller racks. IC Role / Device Role / Timing Role: Real-time acquisition of 12 analog sensor inputs (temperature, pressure, current) and digital status signals via GPIO, with CAN reporting to master controller. Use Value: 10-bit ADC resolution and 41 GPIO pins support mixed-signal conditioning; −40°C to +85°C rating ensures reliability in unconditioned cabinet environments. |
| Motor Drive Feedback Controller | Smart Power Distribution Unit |
Use Scenario: Closed-loop speed/torque control for BLDC motors in HVAC blowers or industrial pumps. IC Role / Device Role / Timing Role: High-precision timer RD channels perform input capture (encoder pulses) and output compare (PWM generation), synchronized to ADC sampling. Use Value: 16-bit timer resolution and 50 ns instruction timing enable <1% duty-cycle error at 20 kHz PWM-critical for EMI reduction and torque smoothness. |
Use Scenario: Intelligent circuit breaker with load monitoring, thermal derating, and CAN-based remote trip coordination. IC Role / Device Role / Timing Role: A/D converter monitors shunt voltage and temperature sensors; CAN module reports real-time current, fault flags, and trip history to SCADA. Use Value: On-chip voltage detection and watchdog timer provide independent hardware-level fail-safe supervision-meeting IEC 61850-3 immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| R5F21237KFP#U1 | Identical core, peripherals, and memory; rated for −40°C to +125°C operating range | Suitable for under-hood automotive or high-temperature industrial enclosures where ambient exceeds 85°C | Select when extended temperature qualification is mandatory; otherwise, R5F21237JFP#U1 offers lower cost and same functionality at standard temp range. |
| R5F21227JFP#U1 | Same R8C/22 Group package and pinout; lacks data flash (no 1 KB × 2 blocks); identical 48 KB program ROM and 2.5 KB RAM | Applicable where nonvolatile parameter storage is handled externally or via software-emulated EEPROM in program flash | Choose when data flash is unnecessary-reduces BOM cost and simplifies firmware update logic while retaining full CAN/LIN/ADC capability. |
Compared with R5F21237KFP#U1, the R5F21237JFP#U1 trades extended temperature tolerance for cost efficiency in cabin or indoor industrial use; versus R5F21227JFP#U1, it adds field-upgradeable data storage without altering PCB layout or driver code-enabling future-proofed calibration and diagnostic features.
Availability
R5F21237JFP#U1 is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC subsystems, and smart power distribution units requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for R5F21237JFP#U1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Renesas Electronics Corporation is a global semiconductor leader specializing in microcontrollers, analog, and power solutions for automotive, industrial, and IoT markets.
The R8C/23 Group, including R5F21237JFP#U1, was designed for cost-sensitive, real-time embedded control in automotive networking and industrial automation-emphasizing integrated CAN/LIN, robust flash endurance, and extended temperature operation.
FAQ
What is the maximum operating frequency and corresponding supply voltage for R5F21237JFP#U1?
The R5F21237JFP#U1 supports a maximum operating frequency of 20 MHz at a supply voltage of 3.0 V to 5.5 V. At this speed, the minimum instruction execution time is 50 ns. For 10 MHz operation, the device supports down to 2.7 V, enabling flexible power design in battery-backed or wide-input industrial systems.
Does R5F21237JFP#U1 include on-chip debug support, and what interface is used?
Yes, R5F21237JFP#U1 includes on-chip debug functionality via the dedicated on-chip debug interface. It supports full-speed background debugging, breakpoint setting, and memory inspection without halting real-time peripheral operation-enabling seamless development of CAN/LIN communication stacks and motor control algorithms.
How many CAN message objects does R5F21237JFP#U1 support, and are they hardware-managed?
The R5F21237JFP#U1 integrates a single CAN 2.0B controller supporting 16 hardware message objects (slots). Each slot includes dedicated acceptance filtering, transmit/receive buffering, and automatic ID masking-offloading protocol handling from the CPU and ensuring deterministic latency for time-critical messages.
What is the endurance specification for the data flash in R5F21237JFP#U1, and how is it organized?
R5F21237JFP#U1 contains two independent 1 KB data flash blocks, each rated for 10,000 erase/write cycles. This organization allows wear leveling across blocks and supports atomic updates-enabling reliable storage of calibration coefficients, event logs, or security keys without external nonvolatile memory.
Can R5F21237JFP#U1 operate without an external crystal, and what clock sources are available?
Yes, R5F21237JFP#U1 can operate without an external crystal. It provides an internal high-speed oscillator (adjustable frequency), a low-speed oscillator, and an XIN/XOUT circuit for external resonators or crystals-giving designers flexibility to optimize cost, board space, and startup time based on application timing requirements.
R5F21237JFP#U1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- 48-LQFP
- Series:
- R8C/2x/23
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- R8C
- Core Size:
- 16-Bit
- Speed:
- 20MHz
- Connectivity:
- CANbus, I2C, LINbus, SIO, SSU, UART/USART
- Peripherals:
- POR, Voltage Detect, WDT
- Number of I/O:
- 41
- Program Memory Size:
- 48KB (48K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- 2K x 8
- RAM Size:
- 2.5K x 8
- Voltage - Supply (Vcc/Vdd):
- 2.7V ~ 5.5V
- Data Converters:
- A/D 12x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
R5F21237JFP#U1 FAQ
1.How can I place an order for R5F21237JFP#U1 through Aetrix?
Please submit a Request for Quotation (RFQ) for R5F21237JFP#U1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for R5F21237JFP#U1 reliable?
The price and inventory of R5F21237JFP#U1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F21237JFP#U1 is usually 5 days.
3.What payment methods are accepted for R5F21237JFP#U1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F21237JFP#U1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R5F21237JFP#U1?
R5F21237JFP#U1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R5F21237JFP#U1 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for R5F21237JFP#U1?
For technical support, including R5F21237JFP#U1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F21237JFP#U1 requirements.
6.How does Aetrix verify that R5F21237JFP#U1 is sourced from the original manufacturer or authorized distributors?
All R5F21237JFP#U1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that R5F21237JFP#U1 meets industry standards.
7.What is the process for return or replacement of R5F21237JFP#U1?
All R5F21237JFP#U1 units undergo pre-shipment inspection (PSI). If there is an issue with R5F21237JFP#U1, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The R5F21237JFP#U1 part is unused and in its original packaging.
Return procedure for R5F21237JFP#U1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
R5F21237JFP#U1 Tags
-
ATTINY4-TSHR
Microchip Technology
-
ATTINY10-TSHR
Microchip Technology
-
ATTINY10-TS8R
Microchip Technology
-
ATTINY202-SSNR
Microchip Technology
-
ATTINY202-SSFR
Microchip Technology
-
ATTINY402-SSNR
Microchip Technology
-
PIC16F15213T-I/MF
Microchip Technology
-
PIC16F15213-E/MF
Microchip Technology
-
PIC10F200T-I/OT
Microchip Technology
-
ATTINY412-SSNR
Microchip Technology
-
PIC10F202T-I/OT
Microchip Technology
-
ATTINY404-SSNR
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
