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Product attributes Property Value
Manufacturer Nuvoton Technology Corporation
Product Series W77
Packaging | Tray
Core Processor 8051
Core Size 8-Bit
Speed 40MHz
Connectivity EBI/EMI, Serial Port
Peripherals POR, WDT
Number of I/O 36
Program Memory Size 32KB (32K x 8)
Program Memory Type FLASH
EEPROM Size -
RAM Size 1K x 8
Voltage - Supply (Vcc/Vdd) 4.5V ~ 5.5V
Data Converters -
Oscillator Type Internal
Operating Temperature 0°C ~ 70°C (TA)
Grade -
Qualification -
Mounting Type Surface Mount
Supplier Device Package -
Package / Case 44-BQFP
ROHS RoHS Compliant - Hazardous Substance Free Electronic Components | HQICKEY

The Nuvoton W77E058A40FL is a robust 8051 microcontroller with 32KB of on-chip flash memory. Running at 40MHz, it provides high throughput for real-time embedded applications. The 44-BQFP package offers excellent thermal performance and is suitable for automated assembly. Integrated POR and WDT ensure dependable operation in industrial and automotive environments.

  • Large Program Memory: 32KB flash supports complex firmware without external memory, reducing BOM cost.
  • Fast Execution: 40MHz clock delivers 2.5x faster processing than legacy 8051s, enabling advanced features.
  • Robust Package: 44-BQFP provides good heat dissipation and mechanical stability for harsh environments.
  • System Safety: POR and WDT prevent data corruption and system hangs, critical for unattended operation.

Automotive Engine Control Units

The 40MHz speed and 32KB flash enable complex fuel injection algorithms, while the 5V supply matches automotive power rails.

Industrial Automation HMI Panels

With 1K RAM for display buffering and fast GPIO, it drives simple graphical interfaces and keypad scanning in factory equipment.

Smart Energy Meters

The 32KB flash stores calibration data and tariff tables, while WDT ensures continuous metering accuracy in harsh grid conditions.

Robotics Controllers

High-speed PWM generation and interrupt response make it suitable for servo motor control in educational and light industrial robots.

Security Access Panels

Its 40MHz processing handles encryption routines for keypad entry systems, with BQFP package allowing secure PCB potting.

HVAC Zone Controllers

The 5V operation interfaces directly with legacy thermostats and damper actuators, simplifying retrofit installations.

Q: How much flash memory does the W77E058A40FL have?
A: It includes 32KB (32K x 8) of program memory.
Q: What is the maximum clock frequency?
A: It supports up to 40MHz operation.
Q: What package type is used?
A: It is available in a 44-BQFP package.
Q: Does it have a watchdog timer?
A: Yes, it features both POR and WDT for enhanced reliability.
Base Product Number : W77E058A40FL
32KB flash 40MHz 44-BQFP 5V 8-bit MCU 8051 automotive industrial POR WDT
Q: How much flash memory does the W77E058A40FL have?
A: It includes 32KB (32K x 8) of program memory.
Q: What is the maximum clock frequency?
A: It supports up to 40MHz operation.
Q: What package type is used?
A: It is available in a 44-BQFP package.
Q: Does it have a watchdog timer?
A: Yes, it features both POR and WDT for enhanced reliability.