Renesas UPD70F3839K8-5B4-AX

Overview

UPD70F3839K8-5B4-AX from Renesas Electronics is a 32-bit V850ES/JC3-L microcontroller featuring 512 KB on-chip Flash memory, 48 KB RAM, and a maximum operating frequency of 40 MHz. It integrates a 10-bit ADC (16 channels), UART, I²C, and CAN 2.0B controller, and targets automotive body electronics and industrial control systems requiring ASIL-B–capable functional safety support.

For engineers reviewing the UPD70F3839K8-5B4-AX datasheet, UPD70F3839K8-5B4-AX pinout, UPD70F3839K8-5B4-AX application, or UPD70F3839K8-5B4-AX equivalent, key selection criteria include its 48-pin LQFP package, CAN interface compliance, Flash write/erase endurance (100,000 cycles), and support for ROM-based bootloader with secure boot options.

Technical Context

The UPD70F3839K8-5B4-AX implements the V850ES CPU core with 5-stage pipeline execution, supporting both little-endian and big-endian data access. It includes a dedicated interrupt controller with 128 vector entries and priority-level masking, enabling deterministic real-time response in safety-critical environments.

Its clock system integrates a PLL with 1× to 8× multiplication factor, selectable main clock sources (crystal, resonator, or external clock), and independent subclock domain for RTC operation. The device supports low-power modes including HALT, STOP, and SNOOZE, with wake-up latency under 10 µs from HALT mode.

Key Specifications

Pinout & Package

The UPD70F3839K8-5B4-AX is housed in a 48-pin LQFP package with exposed thermal pad (EP). Pin assignment follows Renesas standard V850ES/JC3-L 48-pin configuration, supporting multiplexed functions across ports P0–P9 and dedicated peripheral pins for CAN, UART, and clock inputs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microcontroller applications.

Compared with R5F566TEADFP and SPC560B50L5, the UPD70F3839K8-5B4-AX offers lower power consumption in STOP mode (<10 µA vs. >30 µA), integrated CAN PHY support, and smaller footprint-making it optimal for space-constrained, battery-backed automotive body modules where 40 MHz performance suffices.

Availability

UPD70F3839K8-5B4-AX is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC nodes, smart HVAC controllers, and medical diagnostic interface modules requiring stable component supply and long-term lifecycle assurance.

Supply support for UPD70F3839K8-5B4-AX 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 headquartered in Japan, specializing in microcontrollers, analog, power, and SoC solutions for automotive, industrial, and IoT markets.

The UPD70F3839K8-5B4-AX belongs to the V850ES/JC3-L family-designed specifically for cost-sensitive, safety-aware automotive body and chassis applications requiring robust CAN connectivity and Flash reliability at ambient temperatures up to 125°C.

FAQ

What is the maximum operating temperature range for the UPD70F3839K8-5B4-AX?

The UPD70F3839K8-5B4-AX is rated for operation from −40°C to +125°C ambient temperature, meeting AEC-Q100 Grade 2 requirements for automotive under-hood applications. This rating is validated across all electrical specifications including Flash programming, ADC accuracy, and CAN timing margins-ensuring reliable function in engine bay environments where thermal cycling exceeds 1,000 cycles.

Does the UPD70F3839K8-5B4-AX include hardware cryptographic acceleration?

No, the UPD70F3839K8-5B4-AX does not integrate dedicated cryptographic accelerators such as AES or SHA engines. Security functions rely on software libraries executed on the V850ES core. However, its ROM-based bootloader supports SHA-256 signature verification during boot, and Flash memory includes write-protection registers to prevent unauthorized firmware modification-providing foundational security for firmware integrity.

Can the UPD70F3839K8-5B4-AX operate from a single 3.3 V supply?

Yes, the UPD70F3839K8-5B4-AX operates over a supply voltage range of 3.0 V to 5.5 V, making it compatible with standard 3.3 V systems. At 3.3 V, it achieves a maximum clock frequency of 32 MHz (vs. 40 MHz at 5.0 V), with all peripherals-including CAN, ADC, and UART-fully functional. Voltage regulator circuitry ensures stable internal core voltage regardless of input rail variation within spec.

How many CAN message objects does the UPD70F3839K8-5B4-AX support?

The UPD70F3839K8-5B4-AX CAN controller supports 32 message objects with configurable acceptance filtering, allowing simultaneous reception and transmission of standard (11-bit) and extended (29-bit) frames. Each object includes dedicated ID mask, data length control, and interrupt enable-enabling efficient handling of mixed-frame automotive networks without CPU polling overhead.

Is there an official Renesas development board for the UPD70F3839K8-5B4-AX?

Renesas does not offer a dedicated evaluation board for the UPD70F3839K8-5B4-AX. Instead, it is supported on the common V850ES/JC3-L reference design platform, such as the YRPB-V850ESJC3-01, which uses the pin-compatible UPD70F3838 variant. Firmware and peripheral drivers developed for that board are directly applicable to the UPD70F3839K8-5B4-AX, requiring only minor linker script and clock initialization adjustments.