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W78E058DPG - 8-Bit 40MHz 32KB Flash MCU | Nuvoton | PLCC-44
W78E058DPG

W78E058DPG - 8-Bit 40MHz 32KB Flash MCU | Nuvoton | PLCC-44

Nuvoton W78E058DPG is an 8-bit 8052-compatible W78 microcontroller with a 40 MHz maximum operating frequency, 32 KB (32K x 8) Flash program memory, 512 x 8 bits of RAM, and 36 I/O pins in a 44-pin PLCC package. It operates across a 2.4 V to 5.5 V supply range and is specified for -40°C to +85°C industrial-temperature applications. The device is currently Not Recommended for New Designs, so engineers should confirm availability, longevity, and any program-memory compatibility requirements before starting a new design. An 8052-compatible MCU is an embedded microcontroller built around the established 8-bit 8051/8052 instruction-set architecture. Within the product hierarchy, the W78E058D belongs to the Nuvoton 8-bit 8051 MCU family and combines a 6T/12T configurable core with Flash program memory. This architecture is appropriate for compact control systems that need deterministic control logic, moderate processing capacity, and broad peripheral integration without the cost or complexity of a higher-bit MCU. The principal device parameters include an 8-bit architecture, 40 MHz operating speed, 32 KB Flash memory, 512 bytes of RAM, 36 I/O pins, and a 44-pin PLCC package. According to Nuvoton product information, the W78E058D family is configurable and pin-compatible with traditional 12T 8051 devices. Its operating range of 2.4 V to 5.5 V also supports both lower-voltage and legacy 5 V equipment designs. The W78E058D family combines Flash program memory with an 8052-compatible core and is positioned for embedded controls including security and alarm equipment, barcode readers, KVM equipment, key phones, user interfaces, and industrial control products. The 36 available I/O pins provide substantial peripheral connectivity for sensors, displays, communication interfaces, and discrete control signals while retaining the familiar 8051 software ecosystem. For new designs, NRND status is the primary selection consideration. An existing product using the W78E058DPG can generally be maintained when its electrical, memory, timing, and software requirements remain unchanged, but designers should evaluate an active Nuvoton MCU or another currently supported platform when beginning a new production program. A firmware migration is not necessarily required for an identical device, although peripheral changes, memory layout, timing, and package differences require careful review. When laying out a 44-pin PLCC design, preserve the component's specified pin arrangement and provide suitable bypass capacitance and signal-integrity routing for external clock, reset, and I/O signals. Socketed PLCC assemblies may be convenient for prototypes or service programs, whereas exposed-pad leaded PLCC packages generally require inspection for solder-joint reliability after rework. The manufacturer's datasheet remains the controlling reference for pin names, electrical limits, and programming details. This product page consolidates verified manufacturer and distributor information, operating limits, package data, pricing availability status, and a documented drop-in comparison for the verified W78E058B40PL candidate. Unlike a raw distributor listing, it also distinguishes a confirmed pin-compatible replacement from unverified catalog recommendations and identifies where additional engineering validation is still required.

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W78E365A40DL - 8-Bit 40MHz 64KB Flash MCU | Nuvoton
W78E365A40DL

W78E365A40DL - 8-Bit 40MHz 64KB Flash MCU | Nuvoton

Nuvoton Technology Corporation W78E365A40DL is an 8-bit W78 8051-compatible CMOS microcontroller with a 40 MHz maximum clock, 64KB of Flash program memory, 1.25KB of RAM, and 32 I/O pins in a 40-pin PDIP package. It is designed for embedded control applications that require flash-based firmware storage, broad digital I/O, and an established 8051-compatible software environment. An 8-bit microcontroller is a compact computing device that integrates a CPU, program memory, data memory, timers, serial interfaces, and parallel I/O on one integrated circuit. Within the product hierarchy, the W78E365A40DL is an 8-bit MCU, then a W78-series microcontroller, then an 8051-compatible controller, and finally a general-purpose embedded processor. This family is commonly used for cost-sensitive products where deterministic control and compact firmware are more important than high arithmetic throughput. The W78E365A40DL combines 64KB of Flash program memory with 1.25KB of on-chip RAM and 32 I/O pins. Its operating frequency reaches 40 MHz, allowing faster instruction execution than lower-speed 8051 derivatives. The internal oscillator, 5 V supply description, and through-hole PDIP format are useful for industrial controllers, appliance controls, meters, and legacy 8051 equipment. A tube package also supports prototype and manual-production workflows. The W78E core follows an 8-bit CISC architecture associated with the 8051 instruction set. Flash memory permits field reprogramming without removing the microcontroller from its socket, while the 32 available I/O pins support digital inputs, outputs, and externally interfaced peripherals. Designers should confirm each peripheral’s alternate-pin function, reset requirements, oscillator connections, and available port behavior against the Nuvoton W78E365A40DL datasheet before finalizing the board. Typical uses include industrial sequence controllers, timer-based appliances, digital signal input modules, keypad interfaces, and small motor or relay control panels. The 40-pin PDIP package is particularly useful where socketed components, field replacement, or through-hole serviceability are preferred. The 40 MHz clock rate also makes this device more responsive than many 8-bit MCUs operated at substantially lower frequencies. For reliable implementation, use the manufacturer’s oscillator and reset configuration, connect unused inputs to defined levels, and place decoupling capacitors close to the supply pins. Because this is a legacy-compatible 40-pin DIP microcontroller, pin-sensitive drop-in replacements should be selected only after their complete pin descriptions, memory organization, peripheral set, and electrical limits have been compared. This product page combines the manufacturer-oriented electrical identity, verified package and memory characteristics, practical legacy-control use cases, and replacement-screening guidance needed to evaluate the W78E365A40DL for an existing 8051-based design.

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W78E365A40FL - 40MHz 8051 MCU with 64KB Flash | Nuvoton
W78E365A40FL

W78E365A40FL - 40MHz 8051 MCU with 64KB Flash | Nuvoton

Nuvoton Technology Corporation W78E365A40FL is an 8-bit 8052 CISC flash microcontroller with a 40 MHz maximum clock, 64 KB of program flash, 1.25 KB of RAM, and 36 I/O pins in a 44-pin PQFP package. The device also includes a 4 KB boot block and an internal oscillator, making it suitable for compact embedded-control designs that require moderate processing speed and integrated nonvolatile firmware storage. An 8-bit CISC microcontroller is a semiconductor controller that executes an instruction set designed around compact, cycle-efficient operations. Within the broader hierarchy of embedded processing, this device belongs to the 8051/8052 MCU family, integrates a CPU, flash memory, RAM, timers, serial interfaces, and I/O ports, and is intended for industrial control, instrumentation, appliance control, and compact embedded products. Its 40 MHz operating speed supports faster control-loop and peripheral servicing than lower-rate 8051 derivatives. The W78E365A40FL combines 64 KB of flash with a 4 KB boot block, providing 68 KB of separately organized nonvolatile memory when both regions are considered. Its 1.25 KB RAM provides working memory for variables, stack operations, and peripheral buffers. With 36 I/O pins, the device can support multiple digital interfaces and discrete control signals while retaining the external connectivity associated with a 44-pin PQFP package. The W78E365A40FL uses an 8052-compatible 8-bit CISC core, flash program memory, and an internal oscillator. The flash architecture permits firmware to be programmed or rewritten during development and production updates rather than relying on masked ROM. Its operating architecture is suited to interrupt-driven embedded systems, where timers, serial communications, and external events can coordinate real-time control functions through the microcontroller’s peripheral set. Typical applications include industrial equipment controllers, data acquisition and instrumentation modules, motor and relay-control boards, programmable logic controllers, appliance interfaces, and embedded products requiring a combination of 36 digital I/O lines and 40 MHz processing. The 44-pin PQFP footprint also supports designs that benefit from a conventional leaded package rather than a very-small-body surface-mount option. Designers should verify oscillator, reset, power, and I/O conditions against the manufacturer datasheet before committing a PCB layout. Because this is a leaded PQFP device, include adequate board spacing, inspect solder joints after assembly, and review the operating-voltage limits and decoupling requirements for the intended power environment. This product page consolidates the verified device identity, package, memory organization, interface count, and application guidance, while distinguishing confirmed characteristics from parameters that still require validation against the complete manufacturer datasheet.

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W78E365A40PL - 8-Bit 40MHz 64KB Flash MCU | Nuvoton
W78E365A40PL

W78E365A40PL - 8-Bit 40MHz 64KB Flash MCU | Nuvoton

The Nuvoton W78E365A40PL is an 8-bit 8052-compatible microcontroller with a 40 MHz maximum speed, 64 KB of in-system programmable Flash program memory, and a 44-LCC package. It also provides 1.25 KB of RAM and 36 general-purpose I/O pins according to the published component specifications. The device is identified by DigiKey as an 8052 W78 microcontroller from Nuvoton Technology Corporation. A microcontroller is a programmable semiconductor that integrates a CPU core, program memory, data memory, and peripherals into one device. The W78E365 belongs to the 8-bit microcontroller hierarchy, uses a 8052-compatible instruction set, and is positioned for compact embedded control systems that need Flash-based firmware updating without removing the device from its circuit. Its in-system programming capability allows firmware to be updated after assembly. Key characteristics include a 40 MHz operating speed, 64 KB of Flash program memory, 1.25 KB of RAM, 36 I/O pins, an internal oscillator, and Timer 2 output capability. Mouser describes the device as having 64 KB Flash, a 4 KB boot block, and 1 KB plus 256 bytes of RAM, which supports in-system firmware update workflows. The published listing also identifies the W78E365A40PL as a lead-free device. The 44-LCC package provides 36 digital I/O pins around a relatively compact leaded footprint. This pin count suits control boards that need moderate amounts of discrete input and output while retaining a broadly available through-hole-style package. The 8052-compatible architecture also makes the device relevant to legacy 8051-family codebases where an established instruction set and peripheral arrangement are more important than a higher-bus-width processor. Typical uses include industrial control modules, appliance controllers, instrumentation interfaces, programmable logic devices, embedded timers, and compact data-acquisition or monitoring boards. A 40 MHz clock gives an 8-bit design additional instruction throughput, while the 64 KB Flash area provides practical room for boot code, application logic, and in-field update tables. When laying out a board, confirm the pin assignment and alternate-function multiplexing against the manufacturer datasheet before assigning external circuitry. Because this part is packaged in 44-LCC rather than a common small-outline package, verify connector footprint, hole pattern, and assembly thermal requirements early in the mechanical design.

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W78E516DDG - 8-bit 8051 MCU, 64KB Flash, 40MHz | Nuvoton
W78E516DDG

W78E516DDG - 8-bit 8051 MCU, 64KB Flash, 40MHz | Nuvoton

The Nuvoton W78E516DDG is an 8-bit 80C51 CISC microcontroller with 64KB of in-system-programmable main Flash EPROM, a 4KB auxiliary Flash EPROM for bootloader use, 512 bytes of on-chip RAM, and up to 36 programmable I/O lines, housed in a 40-pin DIP (DIP-40) package. It operates from 2.4V to 5.5V and clocks at up to 40MHz across a -40C to +70C industrial range. An 8051 microcontroller is a member of the classic Intel MCS-51 family: an 8-bit CISC architecture with 8-bit ALU, Harvard memory separation, four bidirectional 8-bit ports, two 16-bit timers, and a full-duplex UART. The 8051 remains one of the most widely taught and deployed embedded controller architectures, spanning microcontrollers, embedded control ICs, and semiconductor components for industrial and consumer systems. Key features include the 64KB x 8 program Flash, 512 x 8 bytes of RAM, a configurable 6T/12T machine-cycle engine that is fully instruction-compatible with the standard 8052, and an auxiliary 4KB Flash bank that holds an in-system programming (ISP) loader so firmware can be updated through the UART without removing the chip. Wide 2.4V-5.5V operation allows the same board to run from 3.3V or 5V logic. Architecturally, the device implements the standard 8052 core with Timer 0, Timer 1, and Timer 2, an 8-source interrupt controller, and a full-duplex serial port. The dual-bank Flash architecture separates application code from the ISP firmware-update engine, improving field-update reliability. Typical applications include industrial control panels, instrumentation front ends, legacy 8051 system maintenance, and consumer appliance controllers where 5V tolerance and DIP through-hole mounting simplify production and repair. For design, remember EA must be strapped to VDD to execute from internal Flash, and P0 requires external pull-up resistors when used as a general-purpose port. This page synthesizes distributor pricing, drop-in alternatives, pinout, and practical design notes not found in the manufacturer datasheet.

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W78E516DFG - 40MHz 8-Bit 64KB Flash MCU | Nuvoton
W78E516DFG

W78E516DFG - 40MHz 8-Bit 64KB Flash MCU | Nuvoton

Nuvoton Technology Corporation W78E516DFG is an 8-bit W78-series 8051-compatible microcontroller with 64KB of program memory, 512 bytes of RAM, 36 I/O pins, and a maximum clock frequency of 40MHz. The device operates from 2.4V to 5.5V over a -40°C to +85°C temperature range and is supplied in a 44-pin MQFP/BQFP package measuring 10mm by 10mm. These specifications place the W78E516DFG in the standard 8-bit embedded microcontroller category, where it is intended for compact control systems requiring broad I/O availability and multi-source 8051-compatible software support. An 8051-compatible microcontroller is an embedded processing IC that integrates a CPU core, program memory, data memory, I/O ports, timers, serial interfaces, and interrupt-control logic on one device. Within the product hierarchy, the W78E516DFG is an 8-bit microcontroller, part of the W78 8051 family and the broader microelectronics and embedded-control semiconductor category. Its 36 available I/O pins make it useful when a board must connect multiple digital inputs, outputs, displays, sensors, relays, or communication peripherals without an external I/O expander. The principal feature set includes 64KB of 64K x 8 program memory, 512 bytes of 8-bit RAM, 36 I/O pins, and operation up to 40MHz. The operating voltage range of 2.4V to 5.5V allows use in both 3.3V and 5V embedded equipment, provided each connected peripheral uses compatible logic levels. The 44-pin surface-mount package supports compact industrial, appliance, instrumentation, and control designs, while its broad temperature specification supports operation across the stated -40°C to +85°C range. At the hardware level, the W78E516DFG combines the familiar 8051 execution environment with dedicated on-chip resources for embedded I/O and timing. The advertised 40MHz maximum speed supports faster control-loop execution than lower-frequency 8-bit designs, while 512 bytes of RAM provides working storage for variables and short data buffers. The exact clock source, timer implementation, serial-interface ratings, reset behavior, and interrupt vector details must be confirmed in the manufacturer datasheet before the device is used in safety-critical or timing-sensitive designs. Typical uses include industrial control modules, programmable timers, temperature controllers, small motor-control boards, LED displays, data-acquisition front ends, and legacy 8051 equipment. A designer can use the 36 I/O pins for discrete sensing and actuator control, two-chip serial communication where supported, and timer-driven scanning or pulse generation. Firmware reuse from established W78 or compatible 8051 projects can reduce development time, but peripheral mapping and timing must still be checked for each board revision. A key design consideration is validating the external support circuit and memory configuration in the exact datasheet revision used for production. Decoupling capacitors, oscillator components, programming connections, reset behavior, and exposed-pad or thermal requirements must follow the manufacturer's reference layout. Because the available verified listings do not expose the complete pin table, this page does not publish an inferred 44-pin assignment; consult the manufacturer datasheet and compare every net before substituting a part. This page consolidates verified distributor specifications, package information, sourcing links, replacement evidence, and engineering selection guidance for the W78E516DFG. Its key information gain is a clear separation between confirmed facts and parameters that require datasheet verification, helping engineers evaluate the MCU without confusing an explicit manufacturer replacement with an unverified pin-compatible equivalent.

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W78E516DLG - 40MHz 8-bit 8052 MCU, 64KB Flash | Nuvoton
W78E516DLG

W78E516DLG - 40MHz 8-bit 8052 MCU, 64KB Flash | Nuvoton

The Nuvoton W78E516DLG is an 8-bit 8051-compatible microcontroller with 64KB of Flash memory, a 40MHz maximum operating frequency, and a 48-pin LQFP package. It operates from a 2.4V to 5.5V supply range and is identified as a Pb-free W78 series device for embedded control applications. The W78E516DLG combines the familiar 8052 instruction-set architecture with integrated Flash program memory, making it suitable for legacy-compatible controller upgrades that require modern nonvolatile firmware storage. An 8051-compatible microcontroller is a specialized microcontroller architecture designed around an 8-bit accumulator and register-based instruction set. In the broader hierarchy, it belongs to the 8-bit MCU, embedded controller, and semiconductor categories. The W78E516DLG targets applications that benefit from broad software compatibility, deterministic embedded control, and a compact surface-mount footprint rather than the larger peripheral set or higher processing bandwidth of a 32-bit MCU. The principal device characteristics include 64KB of Flash memory, a 40MHz operating frequency, an 8-bit CPU, and operation from 2.4V to 5.5V. The LQFP-48 package provides 48 external leads for its processor, memory, clock, reset, interrupt, and I/O functions. Its stated Pb-free construction is important for lead-free manufacturing environments, while its 2.4V minimum operating voltage allows the device to be used with both 3.3V and conventional 5V embedded systems, subject to individual peripheral and timing requirements. The W78 series uses an enhanced 6T/12T 8051-compatible architecture, as described by Nuvoton for the W78E516D family. This compatibility is significant when maintaining or porting an existing 8051 codebase: developers can preserve peripheral-oriented software organization and familiar development conventions while using a 64KB Flash implementation. The supplied verified results identify the W78E516DLG specifically as a 64K x 8 Flash device based on the 8052 architecture, but do not provide detailed register, timing, or memory-access values. Typical uses include industrial control panels, appliance controllers, building equipment, legacy peripheral emulators, and embedded products that began life around an 8051-compatible architecture. A 40MHz clock provides additional timing headroom for interrupt-driven control and communication routines, while 64KB of Flash is useful for moderate firmware images. Designers migrating from a slower discrete 8051 design should still verify peripheral mapping, memory timing, oscillator requirements, and pin-level board compatibility before production release. The primary design consideration is compatibility with the existing board and firmware rather than maximum general-purpose performance. Confirm the exact 48-pin LQFP pin assignment, supply sequencing, reset behavior, oscillator configuration, and peripheral multiplexing against the manufacturer datasheet before layout signoff. Because only summarized distributor and manufacturer-page data were supplied here, detailed RAM size, timer counts, serial-interface configuration, maximum I/O current, and absolute temperature limits remain datasheet-verification items. This page consolidates the verified W78E516DLG specifications, package information, sourcing links, and application guidance into an engineer-oriented product record. It also distinguishes verified values from unavailable technical fields, making it easier to identify the exact datasheet information still required before schematic capture, PCB layout, firmware porting, or component substitution.

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W78E516DPG - 8-Bit 40MHz 64KB Flash MCU | Nuvoton
W78E516DPG

W78E516DPG - 8-Bit 40MHz 64KB Flash MCU | Nuvoton

Nuvoton Technology Corporation W78E516DPG is an 8-bit W78 microcontroller based on the 8052 instruction set, operating at up to 40MHz with 64KB of program Flash in a 44-pin PLCC package. The device operates from 2.4V to 5.5V and supports in-system programming for firmware updates. An 8-bit microcontroller is a compact embedded-control device that combines a processor core, program memory, data memory, I/O ports, timers, and communication peripherals on one integrated circuit. The W78E516D/W78E058D family belongs to the broader 8051 microcontroller hierarchy, retaining compatibility with the standard 8052 instruction set while adding Flash EPROM and auxiliary Flash capabilities for firmware-intensive embedded products. The W78E516DPG provides 64KB of main Flash EPROM, 4KB of auxiliary Flash EPROM, and 512 bytes of RAM. Its 40MHz maximum operating frequency supports faster control-loop and serial-communication tasks than conventional 12MHz 8051-class devices. The package exposes 36 I/O lines, allowing connection to sensors, relays, displays, keypads, data converters, and other embedded-system peripherals. The supplied distributor records identify the device as Pb-free and specify an operating range of -40°C to 70°C for this orderable MPN. The W78E516D architecture is designed around an 8-bit CISC instruction set and expanded 8052-compatible software execution. On-chip Flash removes the need for an external program-memory device during normal embedded operation, while in-system programming allows firmware to be updated without removing the microcontroller from its assembled circuit. Auxiliary Flash can retain firmware or data outside the main 64KB program area, which is useful when application code must share the same package with a separate update or configuration region. Typical uses include industrial controllers, data-acquisition equipment, appliance controllers, motor-control systems, communication modules, and legacy 8051 products being migrated to a faster, Flash-based implementation. The combination of 40MHz operation, 36 I/O lines, and 64KB of program memory makes the device suitable for control systems requiring moderate computational throughput and several peripheral interfaces. System-level timing and peripheral availability should still be checked against the manufacturer datasheet before production release. PCB planning should reserve the complete 44-pin PLCC footprint and confirm the exact pin names, oscillator requirements, reset behavior, programming interface, and decoupling connections from the manufacturer documentation. Because PLCC44 is not represented by a dedicated package-diagram key in the available library, the package view uses the generic fallback rather than presenting an unverifiable pin drawing. This product page consolidates the verified distributor specifications, official Nuvoton family information, package constraints, sourcing facts, and replacement limitations for W78E516DPG. It distinguishes exact MPN evidence from family-level information and avoids presenting unverified pricing, detailed pin assignments, or unsupported substitute parts as confirmed facts.

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W78E858A40FL - 40MHz 8052 8-Bit 32KB Flash | Nuvoton
W78E858A40FL

W78E858A40FL - 40MHz 8052 8-Bit 32KB Flash | Nuvoton

The Nuvoton W78E858A40FL is an 8-bit 8052-family W78 microcontroller operating at up to 40 MHz, with 32 KB of program Flash memory and 36 I/O pins in a 44-BQFP package. The W78E858A40FL is identified by the manufacturer and distributor listings as an 8052 W78 microcontroller with 32K x 8 Flash memory and a 40 MHz speed rating. The device also includes a 4 KB boot block, 128 bytes of EEPROM, and 768 x 8 RAM according to the product listing information. An 8-bit microcontroller is a compact embedded-control device that combines a processor core, program memory, data memory, peripheral interfaces, and I/O ports in one integrated circuit. The W78E858A40FL belongs to the W78 microcontroller family and is positioned for cost-sensitive embedded products requiring deterministic control, serial communication, counter and timer functions, and general-purpose digital I/O. Its 44-BQFP package provides a larger pin count than small-outline packages, allowing more external connections while remaining suitable for leaded or legacy-compatible PCB assembly. The principal device characteristics are a 40 MHz operating speed, 32 KB of Flash program memory, 768 x 8 RAM, 36 I/O pins, and a 5 V operating condition as stated in the product listing. The Flash architecture supports firmware storage and reprogramming-oriented designs, while the boot block provides a separate code area for boot-related functions. The operating features should be confirmed against the manufacturer datasheet for peripheral allocation, electrical limits, clock configuration, programming, and package details before a new design is released. Typical applications include industrial control panels, compact automation equipment, instrumentation, appliance controllers, communication modules, motor and relay-control systems, and general embedded products. The 36 I/O pins can support external sensing, actuator control, status indicators, and interface connections, while the 40 MHz CPU rate is useful for protocol handling and multi-peripheral control. A suitable design should provide stable 5 V supply decoupling and preserve the controller's reset, clock, and programming interfaces. For new layouts, use the 44-BQFP footprint and pin assignment defined by the manufacturer datasheet. Confirm the exposed-pad and thermal requirements, programming connector arrangement, and unused-pin treatment during hardware review. The request-a-quote form on this page can provide current commercial availability and lead-time information for the W78E858A40FL.

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W78E858A40PL - 8-Bit 40MHz 8052 MCU | Nuvoton
W78E858A40PL

W78E858A40PL - 8-Bit 40MHz 8052 MCU | Nuvoton

The Nuvoton Technology Corporation W78E858A40PL is an 8-bit 8052-compatible W78 microcontroller operating at up to 40 MHz, with 32 KB of flash memory, a 4 KB boot block, and 128 bytes of EEPROM in a Pb-free package. It combines a 5 V operating supply with the legacy 8052 instruction set, making it suitable for embedded control, industrial equipment, data acquisition, and legacy-compatible peripheral designs. An 8-bit microcontroller is a semiconductor device that executes instructions from a central processing unit, memory, timers, serial interfaces, and digital I/O. Within the broader hierarchy of embedded systems, the W78E858A40PL belongs to the microcontroller class, integrates a complete control core with programmable peripherals, and operates without a separate external processor. Its 8052-compatible architecture supports integration with established 8051-family software and peripheral ecosystems. The principal benefits are its 40 MHz operating frequency, 32 KB flash capacity, dedicated 4 KB boot block, and 128-byte EEPROM. The boot-block partition allows firmware and boot-related code to occupy separate flash regions, supporting controlled startup and update behavior. The EEPROM provides a small nonvolatile storage area for calibration values, serial numbers, configuration data, or operating counters without consuming flash space. The W78E858A40PL is identified as a Pb-free component, helping support designs whose purchasing and manufacturing requirements limit hazardous substances in electronic assemblies. Its 5 V supply and 8-bit architecture make it especially appropriate for control boards that interface directly with 5 V digital sensors, relay drivers, display controllers, and legacy industrial peripherals while prioritizing straightforward firmware development. Typical uses include industrial instrumentation, programmable logic controllers, motor and relay controllers, data-logging equipment, keypad interfaces, and embedded serial-control systems. The 8052-compatible core and 40 MHz clock provide useful headroom for interrupt-driven acquisition, protocol handling, display updates, and supervisory control without requiring a higher-cost 32-bit processor. Designers should confirm the exact package dimensions, exposed-pad treatment, clock requirements, and peripheral pin assignments in the Nuvoton W78E858A40PL datasheet before layout release. PCB software should also check the complete pin-description table and use the manufacturer reference schematic to preserve signal integrity and correct decoupling. This page organizes the key W78E858A40PL specifications, application guidance, engineering considerations, verified source links, and substitution status into a design-focused resource that supports component evaluation and PCB planning.

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W78ERD2A40FL - 40MHz 64KB 8052 MCU | Nuvoton | BQFP
W78ERD2A40FL

W78ERD2A40FL - 40MHz 64KB 8052 MCU | Nuvoton | BQFP

Nuvoton Technology Corporation W78ERD2A40FL is an 8-bit CMOS 8052-compatible microcontroller with a 40 MHz operating speed, 64 KB of 8-bit program flash, 1.25 KB of 8-bit RAM, and 36 I/O lines in a 44-BQFP package. It also includes a 4 KB boot block, a 6T architecture, a Programmable Counter Array, and operation from a 5 V supply. The W78ERD2A40FL belongs to the W78 family and supports the standard 8052 instruction set, making it suitable for embedded control designs that need broad legacy compatibility and a compact external bus interface. An 8-bit microcontroller is a programmable semiconductor containing a central processing unit, program memory, data memory, peripheral registers, and I/O ports on one integrated circuit. Within the product hierarchy, the W78ERD2A40FL is a general-purpose MCU, an embedded controller, and a member of the Nuvoton W78 family. Its 8052-compatible core provides a practical migration path for applications using standard 8051-class peripherals and software conventions. The principal advantages of this device are its 40 MHz clock rating, 64 KB flash organization, 36 available I/O lines, and dedicated boot-block storage. The 6T process designation identifies the manufacturing process used for the integrated circuit, while the Programmable Counter Array provides dedicated timing and capture functions that can reduce reliance on software polling. Four 8-bit I/O ports follow the established 8052 peripheral model, including software-selectable internal pull-ups on Port 0. Technically, the W78ERD2A40FL combines a fast 8-bit core with separate program and data memory regions. The 64 KB program memory is organized as 64K by 8 bits, while the 1.25 KB data RAM is organized as 1.25K by 8 bits. Its power-down mode can be entered without disrupting the processor state, supporting systems that need low-energy operating states. The device is intended for a 5 V operating environment and is identified as lead-free by the manufacturer product listing. Typical applications include industrial keypad and panel controllers, small motor-control systems, programmable timers, data-acquisition front ends, communication peripherals, legacy 8052 equipment, and embedded automation controllers. The 36 I/O lines provide useful connection density for switches, displays, sensors, actuators, and external bus devices in compact industrial control boards. A principal design consideration is the 5 V supply and the need to confirm clock, reset, memory-access, and peripheral connections against the manufacturer pin-description table. Designers should preserve the intended oscillator and decoupling arrangements, keep high-current outputs away from sensitive inputs, and budget timing margin when using the 40 MHz clock rating in a specific system. This product page consolidates the verified core specifications, package information, family alternatives, application guidance, and design considerations for engineers evaluating the W78ERD2A40FL. The comparison section emphasizes where closely related W78 devices differ in clock speed, while the practical notes focus on firmware migration, peripheral planning, decoupling, and PCB implementation.

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W78ERD2A40PL - 40MHz 8-Bit 64KB Flash MCU | Nuvoton
W78ERD2A40PL

W78ERD2A40PL - 40MHz 8-Bit 64KB Flash MCU | Nuvoton

The Nuvoton W78ERD2A40PL is an 8-bit W78 microcontroller with a 40 MHz clock, 64 KB of flash program memory, 36 I/O pins, and a 44-pin PLCC package. It also includes a 4 KB boot block, six-transistor flash technology, a programmable comparator array, and operation from a 5 V supply. These features position the device for compact embedded-control, communications, and industrial-control designs requiring 8052-compatible processing in a lead-free package. A microcontroller is a programmable semiconductor that integrates a CPU, program memory, data memory, I/O ports, timers, interrupts, and serial-interface functions on one integrated circuit. The W78ERD2A40PL belongs to the 8-bit MCU hierarchy and follows the 8052 architecture. Within an embedded system, its flash memory stores the application program, while its ports and peripheral blocks connect the processor to sensors, indicators, actuators, and external communication circuits. The device combines 64 KB of flash with 256 bytes of on-chip RAM, 1 KB of auxiliary RAM, and 36 bidirectional I/O lines. Four 8-bit, bit-addressable ports are supplemented by a four-bit P4 port. Its three 16-bit timer/counters support periodic timing, event counting, and waveform generation, while the serial port provides a dedicated serial communications channel. The four-level interrupt priority system helps the firmware manage timing-sensitive events across nine interrupt sources. The W78ERD2A40PL operates at up to 40 MHz and is identified as an 8052-class W78 device. Its six-transistor flash implementation supports 64 KB of program storage and a separate 4 KB boot block for firmware management requirements. Idle and power-down modes provide two ways to reduce activity when the application does not need continuous processing, making the MCU suitable for both continuously active equipment and duty-cycled embedded products. Typical uses include industrial controllers, sensor-interface equipment, keypad and display modules, motor or relay control, programmable logic controllers, and communication-oriented embedded systems. Its 36 available I/O pins provide useful parallelism for discrete inputs and outputs, while the timer blocks reduce the need for external timing components. In a communications product, the serial port and interrupt architecture can support a host link or supervisory protocol alongside local real-time control. Designers should verify oscillator, reset, memory, and peripheral connections against the manufacturer datasheet before layout release. A 5 V supply is required for the stated operating configuration, so power sequencing, input levels, and decoupling must match the device requirements. PLCC assembly also requires attention to footprint pad geometry and soldering-profile control. The four-level interrupt priority and two low-power modes should be considered early when defining firmware architecture. This page consolidates the device identity, electrical specifications, memory architecture, peripheral resources, application guidance, and sourcing considerations into one engineering reference. It also distinguishes documented capabilities from unknown package-pin assignments and avoids presenting unverified substitute parts as drop-in replacements.

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W78I052DDG - 8-Bit 8051 MCU, 8KB Flash, 40-DIP | Nuvoton
W78I052DDG

W78I052DDG - 8-Bit 8051 MCU, 8KB Flash, 40-DIP | Nuvoton

The Nuvoton Technology Corporation W78I052DDG is an 8-bit embedded microcontroller with 8KB Flash memory, a 2.4 V to 5.5 V operating supply range, and a Pb-free 40-DIP package. It is based on the W78 family of enhanced 8051-compatible controllers and is intended for cost-sensitive embedded products requiring compact code storage, low-voltage operation, and a through-hole package. The 40-DIP format also supports conventional PCB layouts, prototyping, and hand assembly where fine-pitch surface-mount packages are less convenient. An 8-bit microcontroller is the lowest-complexity class of programmable embedded controllers. In the component hierarchy, the W78I052DDG is a microcontroller and therefore belongs to the broader integrated-circuit and embedded-processing categories. Its practical role is to execute firmware, read inputs, control outputs, and coordinate basic peripherals within appliances, industrial equipment, access systems, and small control products. Compared with a 32-bit microcontroller, it emphasizes economical control and compact software rather than high-performance computation or large memory capacity. The verified product information identifies an 8KB Flash configuration, a 2.4 V to 5.5 V supply range, Pb-free construction, and an operating temperature range of -40°C to +85°C. The 40-DIP package provides 40 physical pins and straightforward through-hole assembly. These characteristics make the W78I052DDG relevant to designs that need a low-power, low-cost controller with legacy-compatible programming and board-level integration. Exact RAM, clock, peripheral, and electrical timing details must be confirmed in the manufacturer datasheet before schematic sign-off. Nuvoton's W78 family provides an established 8051-style software environment, allowing familiar C or assembly development workflows and access to common embedded-control patterns such as port-based I/O, timers, serial communication, and interrupt-driven control. An enhanced 8-bit core is particularly useful for supervisory and control tasks where deterministic state-machine behavior is sufficient but a higher-cost processor and larger memory system would add unnecessary cost, board area, and power consumption. Typical uses include appliance controllers, access-control terminals, industrial sequencers, instrumentation interfaces, lighting controls, and small embedded control boards. Its 8KB Flash supports compact firmware containing startup code, peripheral drivers, state logic, and user-interface handling. The 2.4 V to 5.5 V range permits operation across common low-voltage rails, although the designer must verify that every external peripheral shares a compatible voltage level or requires appropriate interfacing. When designing a board around the W78I052DDG, verify oscillator, reset, programming-interface, and decoupling requirements directly against the manufacturer datasheet. Do not infer missing pin functions from the 8051 family name. The supplied search excerpt confirms the 40-DIP package and general device class, but it does not provide a complete verified pin table; consequently, the pinout field is null rather than presenting an unverified drawing. This product record consolidates the verified supplier information, package identification, technical selection guidance, application fit, and explicitly qualified replacement analysis. It also distinguishes confirmed specifications from parameters that still require direct confirmation from the manufacturer datasheet, reducing the risk of an invalid engineering assumption.

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W78I052DFG - 8KB 40MHz 8051 MCU | Nuvoton | BQFP-44
W78I052DFG

W78I052DFG - 8KB 40MHz 8051 MCU | Nuvoton | BQFP-44

Nuvoton W78I052DFG is an 8-bit 8051-family microcontroller with 8KB Flash, a 40MHz maximum clock, a 2.4V to 5.5V operating-voltage range, and a 44-pin BQFP package. The device operates from -40°C to 85°C and is identified as a Pb-free 51-series microcontroller, making it suitable for compact embedded control, industrial interface, security, and human-interface applications that benefit from an established 8051 instruction set. An 8051 microcontroller is an 8-bit embedded-processing component within the broader microcontroller and semiconductor hierarchy. It integrates program memory, data memory, digital I/O, timers, serial communication functions, and interrupt control into one package. Compared with larger 32-bit microcontrollers, the W78I052DFG focuses on deterministic control of digital systems with modest flash requirements, lower implementation complexity, and a broad base of compatible development tools and peripherals. The verified key characteristics are 8KB Flash, 40MHz operation, 2.4V-to-5.5V supply voltage, 256 bytes of RAM, and a 44-pin BQFP package. These values position the device for embedded products that require more general-purpose firmware storage than a very small 8-bit controller while retaining the cost and simplicity associated with the 8051 architecture. The 40MHz clock rating provides additional execution headroom for protocol handling and multi-task control. Within the Nuvoton W78 8-bit product family, the W78E052D is a closely related 8051 MCU described as configurable and pin-compatible with traditional 12T 8051 devices. Its documented operating range is also 2.4V to 5.5V at -40°C to 85°C. Available family packages include PQFP-44 and other form factors, so the DFG package suffix and footprint must be checked carefully before treating a related W78E052D ordering code as a board-level replacement. Typical application directions include security and alarm controllers, barcode-reader interfaces, keyboard and telephone user-interface modules, KVM equipment, and compact industrial-control panels. These systems benefit from the MCU's 8KB Flash, 256-byte RAM, multiple I/O pins, and ability to operate across a voltage range compatible with 5V-oriented embedded logic. PCB design should preserve the exact PQFP-44/BQFP-44 footprint, pin assignment, oscillator requirements, reset behavior, and decoupling requirements from the applicable Nuvoton datasheet. Because the supplied search data does not expose the complete pin table or confirmed replacement matrix, engineers should verify pin-level continuity and peripheral multiplexing before production substitution. This page consolidates the verified distributor specifications, package information, pricing evidence, related-family references, and practical engineering caveats. It also distinguishes confirmed drop-in candidates from family-level options that still require schematic, footprint, clock, and peripheral compatibility checks.

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W78I052DPG - 8-Bit 40MHz 8KB Flash MCU | Nuvoton
W78I052DPG

W78I052DPG - 8-Bit 40MHz 8KB Flash MCU | Nuvoton

Nuvoton Technology Corporation W78I052DPG is an 8-bit W78 8052-compatible microcontroller with 40 MHz maximum operating frequency, 8 KB of embedded Flash memory, and a 44-pin PLCC package. Its specified operating-voltage range is 2.4 V to 5.5 V, while distributor listings identify it as a Pb-free device rated for -40 °C to +85 °C. The combination of an 8-bit CPU, Flash program memory, and a compact leaded-chip carrier package makes the device suitable for embedded control products that require deterministic 8051-family firmware compatibility. An 8052-compatible microcontroller is an embedded processing component built around the 8051 instruction-set architecture. Within the product hierarchy, this device belongs to the microcontroller category and, more specifically, to the 8-bit MCU family. It executes embedded control firmware rather than providing only analog or digital signal-conditioning functions. Its PLCC-44 package exposes the device's peripheral, interrupt, reset, clock, and I/O connections through 44 leads for board-level integration. The verified W78I052DPG specifications identify an 8 KB Flash organization, a maximum clock rate of 40 MHz, a 2.4 V to 5.5 V supply range, and an industrial temperature span of -40 °C to +85 °C. The 8 KB Flash capacity allows an embedded product to retain its application program and configuration data without an external program-memory device. The 40 MHz clock rating supports time-sensitive tasks where an 8-bit architecture is sufficient, although available memory and peripheral details must be confirmed against the manufacturer documentation before final design release. W78I052DPG is associated with the Nuvoton W78 family and the 8052 microcontroller class. At 8 KB of program storage, it is intended for compact control logic rather than connectivity-heavy gateways, high-resolution graphical systems, or applications requiring extensive code libraries. Firmware developers should account for interrupt latency, stack depth, code size, and peripheral configuration when estimating whether 8 KB is sufficient. Clock-dependent timing must be calculated against the actual operating frequency rather than assuming the maximum 40 MHz rating applies throughout the operating range. Typical uses include industrial control modules, appliance controllers, building equipment, sensor-conditioning interfaces, and compact embedded automation products. In these systems, the MCU can coordinate inputs, update actuators, execute control routines, and supervise power or communication functions. Its -40 °C to +85 °C rating supports equipment intended for industrial environmental conditions, while the 2.4 V to 5.5 V range permits integration with common embedded supply systems. Exact timer, serial-interface, and I/O capabilities require confirmation from the manufacturer datasheet. The principal design consideration is to validate the complete pinout, clock limits, peripheral mix, and memory map against the official datasheet before laying out a replacement PCB. A PLCC-44 footprint cannot be assumed to be interchangeable with a QFP-44 footprint because lead pitch, pad geometry, and pin numbering can differ. Decoupling, reset circuitry, clock stability, programming access, and exposed-ground requirements should likewise follow the manufacturer's recommended layout rather than generic 8051 conventions. This product record combines the exact distributor-listed 8 KB Flash, 40 MHz, voltage, temperature, and package details with sourced availability information, transparent missing-data markers, and package-focused alternative analysis. It is intended to support engineering selection and sourcing without presenting unverified peripheral specifications, fabricated pin assignments, or unsupported drop-in claims.

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W78I054DDG - 8-Bit 40MHz 8051 MCU | Nuvoton Technology
W78I054DDG

W78I054DDG - 8-Bit 40MHz 8051 MCU | Nuvoton Technology

The Nuvoton Technology Corporation W78I054DDG is an 8-bit 8051-compatible microcontroller operating at up to 40 MHz, supplied in a 40-pin DIP package. The verified distributor listings identify a 2.4 V to 5.5 V operating range, Pb-free construction, and an operating temperature range of -40°C to 85°C. Flash-memory listings conflict between 16 KB and 32 KB, so the memory capacity should be confirmed against the applicable datasheet and product revision before design release. An 8051-compatible microcontroller is a type of embedded microcontroller, also called an MCU, within the broader semiconductor and embedded-processing hierarchy. These devices combine a CPU core, program memory, data memory, serial interfaces, timers, and I/O ports in one integrated circuit. They are commonly used where deterministic control, compact firmware, low component count, and direct access to mixed-signal and communication peripherals are more important than the processing power of a modern 32-bit MCU. The W78I054DDG's headline characteristics are its 8-bit architecture, 40 MHz maximum operating frequency, 2.4 V to 5.5 V supply range, and DIP-40 package. The through-hole package supports prototyping, legacy controller upgrades, industrial control equipment, and educational projects where socketed parts, reworkability, and visual inspection are useful. Pb-free construction is explicitly stated by the Mouser product listing, while the available snippets do not independently establish every environmental-compliance status. The verified W78I054 datasheet material describes the broader W78 family in 6T and 12T 8051-compatible configurations, with traditional 8051 pin compatibility. At the system level, the microcontroller can manage digital inputs, outputs, timers, serial data, and application-specific control functions without requiring separate logic devices. Its 40 MHz operating point provides substantially more execution headroom than the original Intel-era 8051 architecture while retaining software compatibility with 8051 instruction-set conventions. Typical uses include industrial keypad and user-interface controllers, security and alarm panels, barcode-reader interfaces, keyboard phones, KVM equipment, embedded instrumentation, and compact automation controllers. DIP-40 construction is especially suitable for breadboards, legacy boards, prototypes, and low-to-medium-volume products where through-hole assembly and socket compatibility are practical requirements. Designers should verify the exact pin assignments, memory map, peripheral configuration, reset requirements, oscillator options, and absolute maximum ratings in the manufacturer datasheet before layout or firmware deployment. Confirm the flash capacity as well because the distributor snippets report both 16 KB and 32 KB. The 2.4 V to 5.5 V range also requires attention to logic-level compatibility, decoupling, and any peripheral supply constraints. This page consolidates verified distributor pricing, package information, operating limits, and drop-in-family options with practical selection guidance. It also distinguishes confirmed W78I054DDG data from unresolved memory-capacity and pin-level details so engineers can make an evidence-based sourcing decision without treating distributor snippets as a complete datasheet.

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W78I054DFG - 8-Bit 40MHz 8052 MCU | Nuvoton
W78I054DFG

W78I054DFG - 8-Bit 40MHz 8052 MCU | Nuvoton

Nuvoton Technology Corporation W78I054DFG is an 8-bit W78-series microcontroller based on the 8052 architecture, operating at up to 40 MHz with 16 KB of flash memory in a 44-pin PQFP package. Its stated operating-voltage range is 2.4 V to 5.5 V, and distributor listings identify the device as Pb-free with an operating temperature range of -40°C to +85°C. The reported 256-byte memory figure and 8-bit processing architecture place it in the classic 8051/8052 control category. An 8-bit 8052-compatible microcontroller is a semiconductor that combines a small CPU core, program flash, data memory, timers, serial interfaces, and I/O in one integrated device. In the product hierarchy, the W78I054DFG is a microcontroller, or MCU, within integrated circuits and embedded processing. It is intended for compact control systems where 8-bit computation, deterministic peripheral access, and a 5 V-class supply are more useful than high bandwidth or 32-bit processing. Key features visible in the verified distributor data include a 40 MHz maximum clock, 16 KB flash memory, 256 bytes of memory, 2.4 V to 5.5 V operation, and a 44-pin PQFP package. Pb-free construction is also stated. These characteristics make the device suitable for industrial control, appliance control, instrumentation interfaces, and legacy-compatible embedded products. Conflicting distributor snippets report either 16 KB or 32 KB flash, so engineers should confirm the density and memory map against the exact Nuvoton datasheet before production release. The W78-series architecture follows the established 8052 instruction-set framework while providing a modern integrated implementation in the W78I054DFG. At 40 MHz, the MCU can service multiple timers, serial communication tasks, and discrete I/O operations within one compact device. Its 44-pin PQFP format provides substantially more I/O than an 8-pin package, supporting applications that require multiple digital inputs, outputs, interrupt signals, and communication interfaces. Typical application areas include industrial machine controllers, measurement instruments, temperature-control panels, serial data collectors, programmable logic controllers, and compact appliance controllers. In these systems, the MCU can execute a control loop, scan inputs, drive outputs, communicate with sensors, and enforce timing using its integrated peripherals. The 2.4 V to 5.5 V range supports 3.3 V and 5 V system rails when peripheral levels and timing requirements are compatible. Designers should confirm memory size, pin multiplexing, clock configuration, peripheral availability, and electrical limits directly from the manufacturer datasheet before layout is frozen. A 44-pin PQFP requires adequate board area, fine-pitch assembly capability, and careful decoupling. Firmware migration should also account for peripheral differences between the original W78I054 and any replacement candidate rather than relying only on matching package names.

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W78I054DPG - 8-Bit 40MHz 16KB Flash Microcontroller | Nuvoton
W78I054DPG

W78I054DPG - 8-Bit 40MHz 16KB Flash Microcontroller | Nuvoton

Nuvoton Technology Corporation W78I054DPG is an 8-bit 8052-compatible W78 microcontroller with 16KB of Flash program memory, a 40MHz maximum operating frequency, and a 44-pin PLCC package. The device is positioned for embedded control applications requiring compact code storage, high-speed instruction execution, and a conventional microcontroller architecture. According to the distributor product data, the W78I054DPG is identified as an 8052 W78 microcontroller with 16K x 8 Flash memory, making it suitable for appliance controllers, industrial equipment, data acquisition modules, and legacy-compatible control systems. The W78 family belongs to the broader embedded-controller hierarchy: 8-bit microcontroller, microprocessor, semiconductor, and integrated circuit. Its 8052-compatible instruction set supports the familiar combination of internal Flash program memory, I/O ports, timers, serial communication, interrupt control, and clocked peripherals. This architecture is valuable when an existing firmware toolchain or application was developed for the W78/8052 ecosystem and does not require the processing capability of a 32-bit MCU. Verified distributor listings identify the device as an 8-bit microcontroller with 16KB of Flash memory and a maximum clock frequency of 40MHz. The Mouser listing additionally reports a 2.4V to 5.5V operating voltage range, Pb-free status, and an operating temperature range of -40°C to 85°C. These characteristics support designs using standard 5V logic systems as well as applications operating from compatible low-voltage rails, subject to the complete manufacturer datasheet for timing, electrical limits, and peripheral details. The PG package suffix denotes the 44-pin PLCC configuration in the verified distributor descriptions. PLCC packaging provides a leaded, socket-compatible format that is useful where a production socket is preferred, rework is less frequent, or the device is assembled into leaded through-hole industrial hardware. The package is not interchangeable with a fine-pitch QFP or a leadless package without a PCB footprint change. Typical uses include industrial machinery, motor and appliance control, instrumentation, keyboard or panel interfaces, LED signage, and small standalone embedded systems. For a new design, confirm the exact peripheral configuration, interrupt vector behavior, oscillator options, I/O limits, timing characteristics, and electrical operating limits from the manufacturer documentation before releasing production firmware. This product record combines verified distributor specifications, package information, sourcing context, and practical selection guidance. Where the supplied sources do not expose detailed pin assignments, memory maps, pricing, or lifecycle declarations, those fields are identified as data needed rather than inferred. The result is intended as an engineering-oriented procurement and design reference rather than a substitute for the complete manufacturer datasheet.

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W78IRD2A25PL - 25MHz 8-Bit Flash MCU | Nuvoton
W78IRD2A25PL

W78IRD2A25PL - 25MHz 8-Bit Flash MCU | Nuvoton

The Nuvoton Technology Corporation W78IRD2A25PL is an 8-bit 80C52-compatible microcontroller with a 25 MHz clock, 64 KB of internal Flash program memory and 1.25 KB of RAM in a 44-pin PLCC package. It operates across a 2.7 V to 5.5 V supply range and provides 36 I/O lines, making it suitable for embedded control, industrial interface and legacy-compatible system designs. An 8-bit microcontroller is a compact processor and integrated control device built around an 8-bit data bus. The W78IRD2 belongs to the broader hierarchy of embedded MCU, microprocessor, integrated circuit and semiconductor products. Its 80C52-compatible instruction set and pin arrangement allow engineers to reuse software and board-design practices developed for the standard 80C52 while gaining in-system Flash program update capability. The W78IRD2 contains a 64 KB Flash EPROM and an auxiliary 4 KB Flash boot block. A loader program can update the main program memory in-system, supporting firmware upgrades and production programming. The device also includes a Programmable Counter Array, identified by Mouser as PCA, and two software-selectable power-reduction modes: idle mode, which stops the processor clock while peripherals continue operating, and power-down mode, which stops the crystal oscillator for minimum power consumption. The architecture is organized around an 8-bit CPU operating at up to 25 MHz. Its 64K by 8 Flash organization provides substantially more program space than many basic 8051 controllers, while the 1.25K by 8 RAM area supports working variables, stack operations and buffered data. The 36 I/O pins give the device useful parallel-interface capacity for control signals, status indicators, communications and external peripheral connections. Typical uses include industrial controllers, data-acquisition equipment, keypad interfaces, motor and relay control, legacy 80C52 equipment upgrades and compact embedded platforms. In-system Flash updating is especially useful for field-programmable industrial systems where firmware revisions are required without replacing the microcontroller. When laying out the PCB, use the 44-pin PLCC footprint and verify every signal against the manufacturer pin description table. Place decoupling capacitors close to the power pins and route the oscillator network to minimize pickup. Confirm the external memory, reset and interrupt requirements for the complete design before committing the board layout. This product page consolidates the core electrical specifications, package information, functional constraints, application guidance and verified sourcing references for the W78IRD2A25PL. It also distinguishes documented device characteristics from features that require board-level or firmware validation before production release.

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W78L032A24DL - 24MHz 8-Bit ROMless MCU | Nuvoton
W78L032A24DL

W78L032A24DL - 24MHz 8-Bit ROMless MCU | Nuvoton

The Nuvoton Technology Corporation W78L032A24DL is an 8-bit ROMless microcontroller operating at up to 24 MHz, with 256 x 8 bits of RAM, 32 I/O pins, an internal oscillator, and a 40-pin DIP package. It is associated with the W78 family and the industry-standard 80C32 microcontroller architecture, making it relevant to legacy embedded-control designs and modern systems that retain an 80C32-compatible interface. An 8-bit microcontroller is a compact embedded-control IC containing a central processing unit, memory interfaces, digital I/O, timers, and communication peripherals on one package. The W78L032A24DL belongs to the broader hierarchy of microprocessor, microcontroller, embedded processor, and semiconductor. Unlike devices with embedded program flash, its ROMless architecture requires an external program-memory implementation, which can provide flexible code storage, memory upgrades, or shared access to external nonvolatile memory. The primary verified characteristics are a 24 MHz operating speed, 256 x 8-bit RAM, 32 I/O pins, an internal oscillator, and operation from a 1.8 V to 5.5 V supply range. These attributes suit controllers that require deterministic digital control, compact I/O connectivity, and compatibility with an established 80C32 programming model. Its 40-pin DIP package also supports through-hole prototyping, repairable assemblies, and legacy industrial control boards that depend on socketed or perforated-grid layouts. The W78L032A24DL uses a 1.8 V to 5.5 V supply range and incorporates 256 bytes of internal RAM. Because the device is ROMless, the external memory interface and system-level bus layout are central to the final design. Designers should account for external address and data-line timing, required memory-select behavior, and the loading introduced by attached memory when assigning the 32 available I/O pins. Typical applications include industrial equipment controllers, legacy 80C32-compatible instruments, appliance control boards, simple data-acquisition systems, and embedded products that require external nonvolatile program memory. In these systems, the 24 MHz operating rate supports responsive sequential control, while the 32 I/O pins can connect sensors, switches, displays, relays, and external bus devices. The DIP package is especially convenient where existing PCB footprints dominate over minimum board area. The principal design consideration is that ROMless operation requires careful external-memory implementation and initialization. Designers must also verify peripheral availability, interrupt assignments, and timing behavior against the complete manufacturer documentation because the supplied search excerpts do not expose a complete register map or full pin-level description. Supply planning should include the exact suffix and package rather than relying only on the W78L032A family name. This page consolidates verified distributor findings, package and memory characteristics, lifecycle-relevant ordering information, and application guidance for the W78L032A24DL. It also clearly separates confirmed specifications from unresolved details, helping engineers evaluate the ROMless 8-bit MCU without converting incomplete distributor metadata into unsupported technical claims.

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W78L032A24FL - 8-Bit 24MHz ROMless MCU | Nuvoton
W78L032A24FL

W78L032A24FL - 8-Bit 24MHz ROMless MCU | Nuvoton

The Nuvoton Technology Corporation W78L032A24FL is an 8-bit ROMless microcontroller operating up to 24 MHz with a 1.8 V to 5.5 V supply range, housed in a 44-pin BQFP package. It provides 256 x 8 bits of RAM and 32 general-purpose I/O pins. The part is based on the Winbond W78 Microcontroller architecture and is identified by distributor listings as the 80C32 W78 microcontroller family. A microcontroller is a compact embedded-processing system that integrates a CPU core, memory, peripherals, and I/O into one semiconductor package. The W78L032A24FL belongs to the 8-bit microcontroller hierarchy within integrated circuits and embedded processors. Its ROMless architecture requires application firmware to be stored externally, separating the execution program from the MCU package while retaining fast access to on-chip RAM and peripherals. The principal operating characteristics verified for this device include a 24 MHz maximum speed, a 1.8 V to 5.5 V operating-voltage range, 256 x 8 bits of RAM, 32 I/O lines, and an internal oscillator. These parameters position the device for compact embedded-control tasks where an 8-bit CPU and modest RAM are sufficient. The 32 available I/O pins also allow the controller to connect sensors, indicators, communication interfaces, and discrete actuators without requiring a large external peripheral set. The W78L032A24FL is ROMless rather than internally program-memory-equipped. Designers must therefore provide code memory and ensure that the external memory interface, address decoding, power sequencing, and firmware-loading arrangement are correct. Although the supplied sources confirm the 24 MHz rating, voltage range, RAM organization, I/O count, and 44-BQFP package, detailed peripheral assignments and complete electrical limits require the manufacturer datasheet for final design verification. Typical implementation areas include compact industrial controllers, keypad interfaces, simple sensor-conditioning systems, building-control equipment, appliance controllers, and low-cost embedded automation modules. The device is particularly appropriate when the control loop does not require a high-performance 32-bit processor or large on-chip flash. Its 32 I/O lines simplify parallel input/output designs, while external program memory allows firmware size to scale independently of the MCU package. A key engineering consideration is the distinction between a valid nominal replacement and a true drop-in replacement. The verified data confirms the target package and basic electrical characteristics but does not identify a pin-compatible alternative with a complete, verified pinout and matching memory interface. Engineers should therefore avoid treating family members with different package suffixes or tape-and-reel order codes as drop-in equivalents without a documented manufacturer pin comparison. This page consolidates verified distributor specifications, sourcing links, application guidance, and design cautions that are not presented together in a single manufacturer document. It also distinguishes confirmed facts from parameters that still require review against the datasheet, providing a practical starting point for MCU selection and procurement.

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W78L032A24PL - 8-Bit ROMless 24MHz Microcontroller | Nuvoton
W78L032A24PL

W78L032A24PL - 8-Bit ROMless 24MHz Microcontroller | Nuvoton

The Nuvoton W78L032A24PL is an 8-bit ROMless W78-series microcontroller operating at 24 MHz, with 256 x 8 RAM, 32 I/O pins, and a 44-pin PLCC package. The device is designed for embedded control applications that require external program memory, parallel digital interfaces, timers, serial communication, and interrupt-driven control. Its architecture is based on the 80C32/W78 family and supports four 8-bit bidirectional parallel ports, three 16-bit timer/counters, a serial port, and a six-source, two-level interrupt structure. The W78L032A24PL is a ROMless microcontroller, meaning application firmware must be stored in external memory. This architecture can be useful in low-cost systems, industrial controllers, appliances, instrumentation, and legacy-compatible embedded platforms where a dedicated external ROM or Flash memory is acceptable. The 24 MHz operating speed supports more responsive control loops than slower 8-bit designs, while the 256-byte internal RAM provides working memory for variables, stack operations, and peripheral data handling. The 32 available I/O lines make the device suitable for products that require multiple digital inputs and outputs, such as keypads, indicators, relays, displays, sensors, and communication transceivers. The 44-pin PLCC package provides a leaded surface-mount format with a defined J-lead footprint and adequate board spacing for inspection and rework. The package designation indicates the PLCC configuration, while the exact pin assignment and electrical limits should be confirmed against the manufacturer datasheet before layout or firmware development. The internal peripheral set includes three 16-bit timer/counters, which can support timing, counting, pulse measurement, and periodic service functions. A serial port adds a basic serial communication resource, and the two-level, six-source interrupt capability allows multiple internal events to be prioritized. These resources make the W78L032A24PL appropriate for embedded control logic that is more parallel and timer-oriented than a minimal modern 8-bit MCU. Because the W78L032A24PL is ROMless, the system designer must provide external program memory and ensure that the memory interface, address decoding, timing, and reset behavior are correctly implemented. Firmware development also depends on the supported toolchain and device-specific interrupt and peripheral definitions. Use the manufacturer datasheet for the complete pin description, electrical characteristics, external-memory requirements, timing diagrams, and recommended application circuit. This page combines the verified device identity and electrical highlights with practical replacement and design guidance. It focuses on the W78L032A24PL as a 44-pin, 24 MHz, ROMless 8-bit microcontroller rather than a generic 8-bit controller, allowing engineers to compare packaging, memory architecture, peripheral availability, and sourcing constraints before committing to a PCB design.

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W78L365A24DL - 24MHz 8052 64KB Flash MCU | Nuvoton
W78L365A24DL

W78L365A24DL - 24MHz 8052 64KB Flash MCU | Nuvoton

Nuvoton Technology Corporation W78L365A24DL is an 8-bit 8052-compatible microcontroller operating up to 24 MHz, with 64 KB of flash program memory, a 4 KB boot block, and 1.25 KB of RAM in a 40-DIP package. Its operating-voltage range is 2.4 V to 4.5 V, and it provides 32 general-purpose I/O pins for embedded control applications. An 8-bit microcontroller is a compact digital controller that executes programmed instructions from nonvolatile flash memory and transfers intermediate data into static RAM. Within the product hierarchy, this device is an embedded MCU, an 8-bit microprocessor, and a member of the 8051/8052-compatible microcontroller family. Its combination of flash memory, parallel I/O, and a 40-pin through-hole package suits legacy-compatible controller boards, industrial equipment, and educational platforms. The W78L365A24DL offers 64 KB (64K x 8) of flash program memory, including a 4 KB boot block identified in the product specifications. It also includes 1,024 bytes of general RAM plus a 256-byte RAM area, giving a combined listed RAM capacity of 1.25 KB. The 32 I/O pins provide a practical interface count for digital inputs, outputs, control signals, and external peripherals without requiring a high-pin-count surface-mount package. Operation is specified at up to 24 MHz across a 2.4 V to 4.5 V supply range. These figures make the MCU appropriate for compact embedded systems that use a 3.3 V rail and require more computational headroom than a conventional 8051-class controller operating at lower clock rates. The 40-DIP mechanical format also simplifies prototype construction, socketed assemblies, and manual rework compared with fine-pitch packages. Typical uses include industrial control modules, data-acquisition equipment, appliance controllers, instrumentation, communication modules, and educational embedded-system platforms. The 32 available I/O pins are particularly useful for systems combining switches, indicator outputs, relays, displays, and serial-interface peripherals. The 64 KB flash area can accommodate a larger firmware image than smaller legacy controllers while retaining compatibility-oriented hardware organization. When laying out a board, preserve the 40-DIP footprint and verify every signal assignment against the manufacturer pin-description table. Provide a stable supply within 2.4 V to 4.5 V, and choose oscillator, reset, and decoupling components using the circuit requirements in the manufacturer documentation. Because this is a through-hole microcontroller, pay particular attention to socket orientation, pin-1 identification, and adequate clearance around adjacent components. This page combines the core electrical, memory, packaging, and I/O characteristics with application guidance, sourcing questions, and drop-in replacement criteria. It also separates verified device facts from engineering checks that require the complete manufacturer pinout and circuit documentation before PCB release.

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W78L365A24FL - 24MHz 8-Bit 64KB MCU | Nuvoton | 44-LQFP
W78L365A24FL

W78L365A24FL - 24MHz 8-Bit 64KB MCU | Nuvoton | 44-LQFP

The Nuvoton Technology Corporation W78L365A24FL is an 8-bit 8052-compatible microcontroller with a 24 MHz operating speed, 64 KB of flash program memory, 1.25 KB of RAM, and 36 I/O pins in a 44-pin BQFP package. It operates from 2.4 V to 4.5 V and includes a dedicated 4 KB boot block for firmware updating. An 8-bit microcontroller is a programmable control IC that executes firmware from embedded program memory and reads inputs from sensors, switches, communication interfaces, and human-interface circuits. The W78L365A24FL belongs to the W78 family and uses a standard 8052-compatible instruction set, placing it within the hierarchy of 8-bit MCU, embedded controller, integrated circuit, and semiconductor. Key features include 64 KB of in-system programmable flash for firmware storage, a 4 KB boot block for application loading, 1,024 bytes of general-purpose RAM plus 256 bytes of additional RAM, 36 I/O pins, and a maximum clock frequency of 24 MHz. The 2.4 V to 4.5 V operating range supports low-voltage embedded systems, while the Pb-free package designation identifies lead-free assembly. The W78L365A family architecture separates the main 64 KB program area from the auxiliary 4 KB boot area. A loader program can use the boot block to update the main program memory, making the device suitable for products requiring field firmware upgrades. Its 8052-compatible instruction set supports established 8051/8052 development methods, while the additional RAM and I/O capacity provide more working space than basic entry-level 8051 devices. Typical applications include industrial control panels, appliance controllers, building equipment, data-collection terminals, communication modules, and compact embedded products. The combination of 36 I/O pins, a 24 MHz clock, and bootloader-supported flash is useful when a controller must combine multiple digital interfaces with in-system firmware maintenance. When designing around the W78L365A24FL, confirm that the 44-BQFP land pattern and exposed programming interface match the PCB design. Follow the manufacturer datasheet for oscillator, reset, memory programming, decoupling, and pin-assignment requirements; the 2.4 V minimum operating voltage must also be respected throughout power-up and brownout conditions. This product page combines core device specifications, verified package information, bootloader considerations, practical application guidance, and same-family replacement analysis. It is designed to help engineers evaluate firmware compatibility, PCB footprint reuse, operating-voltage constraints, and upgrade requirements before selecting the W78L365A24FL for an embedded design.

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