Renesas UPD78F0503AFC-AA3-A

Overview

UPD78F0503AFC-AA3-A from Renesas Electronics is an 8-bit single-chip microcontroller in the 78K0/Kx2 family, featuring 64 KB on-chip Flash memory, 4 KB RAM, and a 16-bit timer/counter with PWM output capability. It operates at up to 20 MHz CPU clock frequency with 10-bit A/D converter (8 channels), serial interface (UART, CSI, I²C), and operates from 2.7 V to 5.5 V supply. It is used in industrial control panels requiring deterministic real-time response and low-power operation.

For engineers reviewing the UPD78F0503AFC-AA3-A datasheet, UPD78F0503AFC-AA3-A pinout, UPD78F0503AFC-AA3-A application, or UPD78F0503AFC-AA3-A equivalent, this page delivers verified technical context, package mapping, functional pin roles, and validated alternative options for embedded control design and BOM continuity planning.

Technical Context

The UPD78F0503AFC-AA3-A implements the 78K0S core with 16-bit ALU, 16-level hardware stack, and interrupt vector table supporting 32 interrupt sources. Its peripheral set includes a 10-bit A/D converter with sample-and-hold and conversion time of 1.2 μs (typ.), three 16-bit timers (T0–T2) with capture/compare/PWM modes, and dual serial interfaces (UART + CSI/I²C).

It supports expanded-specification features over conventional 78K0/KB2 parts: faster A/D conversion time, improved X1 oscillator stability (±0.5% over -40°C to +85°C), higher flash rewrite endurance (100,000 cycles), and extended data retention (20 years at 85°C). The device uses a single-supply CMOS process and integrates on-chip voltage regulator for internal logic.

Key Specifications

Pinout & Package

UPD78F0503AFC-AA3-A is housed in a 64-pin LQFP (10 mm × 10 mm, 0.5 mm pitch) package with exposed thermal pad. Pin functions are defined per Renesas Hardware User's Manual Rev.4.01 (R01UH0008EJ0401), Section 2.1.1 (78K0/KB2).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit microcontroller applications.

Compared with UPD78F0503AFC-AA3-A, R5F100BGAFB#30 offers superior energy efficiency and modern toolchain support but sacrifices analog subsystem robustness, while UPD78F0513AGC-UEU-AX extends functionality with CAN at the cost of footprint and layout compatibility.

Availability

UPD78F0503AFC-AA3-A is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, PLC I/O modules, and home appliance control boards requiring stable component supply across multi-year production cycles.

Supply support for UPD78F0503AFC-AA3-A 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 Japanese semiconductor manufacturer specializing in microcontrollers, analog, power, and SoC solutions for industrial, automotive, and infrastructure markets.

The UPD78F0503AFC-AA3-A belongs to the 78K0/Kx2 8-bit MCU product line, designed specifically for cost-sensitive, real-time embedded control applications demanding high reliability, analog integration, and long-term supply stability in industrial environments.

FAQ

What is the maximum operating frequency of the UPD78F0503AFC-AA3-A?

The UPD78F0503AFC-AA3-A supports a maximum CPU clock frequency of 20 MHz using the external main system clock (X1 oscillator). When using the on-chip high-speed oscillator (HOCO), the maximum is 8 MHz. This frequency determines instruction execution speed and peripheral timing margins - for example, UART baud rate accuracy and PWM resolution depend directly on clock stability and frequency selection.

Does the UPD78F0503AFC-AA3-A include an on-chip voltage regulator?

Yes, the UPD78F0503AFC-AA3-A integrates an on-chip voltage regulator that generates a stable 3.3 V supply for internal analog circuits. It requires a 1.0 μF ceramic capacitor connected to the REGC pin for stabilization. This eliminates the need for an external LDO in many 5 V system designs, simplifying power architecture and reducing bill-of-materials cost.

How many A/D input channels does the UPD78F0503AFC-AA3-A support?

The UPD78F0503AFC-AA3-A supports eight analog input channels for its 10-bit successive-approximation A/D converter. These channels are mapped to P00–P06 and AVREF pins, allowing simultaneous sampling of multiple sensors such as thermistors, potentiometers, or current shunts. Channel selection is controlled via the ADPC register in software.

Is the UPD78F0503AFC-AA3-A pin-compatible with other 78K0/KB2 devices?

No, the UPD78F0503AFC-AA3-A is not universally pin-compatible across all 78K0/KB2 variants. While it shares the same 64-pin LQFP package with several members (e.g., UPD78F0502AFC-AA3-A), differences in peripheral mapping - such as UART/CSI/I²C pin assignments and A/D channel routing - require verification against the specific device's pin function table before substitution.

What is the flash memory endurance specification for the UPD78F0503AFC-AA3-A?

The UPD78F0503AFC-AA3-A guarantees 100,000 write/erase cycles for its 64 KB on-chip Flash memory, with data retention of 20 years at 85°C ambient temperature. This endurance rating applies to the expanded-specification variant and exceeds that of conventional-specification 78K0/KB2 parts (10,000 cycles), making it suitable for applications requiring frequent firmware updates or parameter storage.