Интегральные схемы

W78C438C40FL

W78C438C40FL - 40MHz 8-Bit ROMless MCU | Nuvoton | 100-QFP

Nuvoton Technology Corporation W78C438C40FL is a 40 MHz, 8-bit, ROMless CMOS microcontroller with 40 I/O lines, a 100-QFP package, and a 4.5 V to 5.5 V supply range. Designed as a derivative of the W78C58 microcontroller family, it provides external program-memory addressing and substantial peripheral integration for embedded control systems. The W78C438C is functionally compatible with the W78C32 while extending its memory and I/O capabilities. An 8051-family microcontroller is an embedded-processing device built around a compact 8-bit CPU, program and data memory interfaces, timers, serial communication blocks, and general-purpose I/O. Within the product hierarchy, the W78C438C40FL is an 8-bit microcontroller, an embedded processor, and a system-on-chip platform designed for deterministic control tasks. Its ROMless architecture allows the application program to reside in external memory while the microcontroller executes code and manages peripheral activity. The device operates at up to 40 MHz and provides five general-purpose I/O ports totaling 40 I/O lines according to the manufacturer datasheet. It supports 256 bytes of 8-bit RAM and can use a 64 KB program-memory and 1 MB data-memory addressing arrangement, or memory-mapped chip-select logic. The 4.5 V to 5.5 V operating range supports conventional 5 V industrial and embedded equipment. An external oscillator provides clocking flexibility when the system requires a specific timing source. The W78C438C architecture extends the classic 8051 design with memory-mapped external interfaces and four external interrupts. Its 40 MHz operating capability allows more frequent interrupt servicing and peripheral transfers than lower-speed 8-bit implementations. Because program memory is external, board-level design must account carefully for address decoding, bus timing, access control, and the electrical characteristics of the selected memory devices. The 100-QFP package exposes substantially more interface signals than smaller 8-bit controller packages. Typical applications include industrial automation controllers, data-acquisition and I/O-expansion systems, embedded communication equipment, industrial instrumentation, legacy 8051 peripheral controllers, and custom control platforms requiring external program storage. Its five ports make it useful where numerous digital lines must connect to sensors, relays, displays, memory devices, and bus transceivers. A functional-compatible 8051 software base can also simplify migration from established controller designs. For a new board, verify external memory address decoding and interrupt-priority assignments before committing the layout. Keep high-current bus and output-driver traces separate where practical, provide local bypass capacitance at the supply pins, and confirm all external signals against the pin-description table in the manufacturer datasheet. The W78C438C40FL is also identified as an active lifecycle part, making it appropriate for both new designs and maintenance of existing 8051-based platforms. This page consolidates the core electrical, memory, package, and lifecycle characteristics of the W78C438C40FL with practical implementation guidance, application fit, comparison fields, and design checks. It focuses on decisions engineers must make when integrating a ROMless, high-speed 8-bit microcontroller into an external-memory architecture.

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W78E051C40PL

W78E051C40PL - 8-bit 8051 MCU, 4KB Flash, 40MHz, 44-PLCC | Nuvoton

The Nuvoton/Winbond W78E051C40PL is an 8-bit 8051-compatible microcontroller operating up to 40 MHz, integrating 4 KB of in-system programmable Flash EPROM and 128 bytes of on-chip RAM in a 44-pin PLCC package. According to the manufacturer datasheet (publication release November 10, 2006, Revision A4), the W78E051C40PL exposes four 8-bit bi-directional bit-addressable I/O ports (P0-P3) plus an additional 4-bit P4 port, two 16-bit timer/counters, a full-duplex UART, and an enhanced 6-source/2-level interrupt controller. The "40" suffix denotes the 40 MHz top clock, while the "PL" package code designates the 44-lead Plastic Leaded Chip Carrier (JEDEC MS-018). Programming is supported via standard 8051 tools because the instruction set is binary-compatible with the industry-standard MCS-51 core. An 8051 microcontroller (technically an MCS-51 family MCU) is an 8-bit Harvard-architecture CISC microcomputer originally introduced by Intel in 1980; despite its age the family remains popular in cost-sensitive, deterministic, deeply embedded applications because of its tiny footprint, predictable interrupt latency, and unparalleled third-party tool support. As a Flash EPROM variant the W78E051C family sits at the highest tier of the classic 8051 hierarchy: mask-ROM < OTP EPROM < Flash EPROM, with Flash enabling ISP and field-upgradeable firmware. In the broader taxonomy, an MCU is a programmable subset of a microprocessor and, more generally, a digital integrated circuit under power management and embedded-computing classifications. Key features include 4 KB Flash program memory, 128 bytes internal RAM, 36 general-purpose digital I/O lines, two 16-bit timers/counters, one UART with framing-error detection, six interrupt sources with two priority levels, on-chip oscillator with external crystal, power-saving Idle and Power-Down modes, and an in-system programming (ISP) interface through the serial port. According to the datasheet the device supports a wide operating frequency range, allowing software to reduce clock speed dynamically for power-sensitive applications. Architecturally, the W78E051C uses a 12-clock-per-machine-cycle core (the classic 8051 convention) with separate 64 KB program and 64 KB external-data address spaces, plus a 256-byte internal RAM space split between register banks, bit-addressable area, and user RAM. The Flash memory subsystem provides on-chip page-erase and byte-program capability, supporting in-application firmware updates via the UART bootloader on PLCC-package variants. Typical applications include industrial control subsystems, home appliance mainboards, keyboard/mouse scanners, sensor signal conditioning, low-cost USB bridges, LED display drivers, and legacy 8051 firmware upgrades. The wide frequency range and low-power Idle/Power-Down modes make it suitable for both mains-powered controllers and battery-backed utilities. Design-wise, ensure the EA/VPP pin is tied to VCC for internal-Fetch operation, or driven to +12 V only during parallel programming. Decouple VCC and AVCC (if present) with 0.1 microfarad ceramic capacitors placed within 5 mm of the pins to suppress switching noise during oscillator start-up and ISP writes. This page synthesizes distributor pricing, cross-reference drop-in alternatives (Nuvoton W78E052 and W78E058 variants) and practical PCB layout notes not consolidated in the manufacturer datasheet.

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W78E051DDG

W78E051DDG - 8-Bit 40MHz 4KB Flash MCU | Nuvoton

Nuvoton Technology Corporation W78E051DDG is an 8-bit 8052-compatible W78 microcontroller with 4KB of Flash program memory and a maximum clock frequency of 40MHz. It operates from 2.4V to 5.5V and is supplied in a 40-pin DIP package. The verified distributor data identifies the device as Pb-free and specifies an operating temperature range of -40°C to +70°C. An 8-bit microcontroller is a compact embedded-control device integrating a CPU, program memory, data memory, and peripherals on one semiconductor package. Within the product hierarchy, W78E051DDG belongs to the embedded microcontroller class and is positioned for cost-sensitive control systems that require an 8-bit processing engine, Flash memory, and a conventional through-hole package. The 8052-compatible architecture also supports established embedded software and instruction-set familiarity. The primary features available from the verified data are 4KB of Flash program memory, operation up to 40MHz, a 2.4V to 5.5V supply range, and Pb-free construction. These attributes make the device applicable to industrial controllers, embedded automation equipment, motor-control systems, metering equipment, and connected low-power board designs. Its 40-DIP format also supports prototype construction and through-hole assembly. Technically, the W78E051DDG combines an 8-bit processor core with on-chip Flash rather than relying solely on an external program-memory device. A 40MHz operating rate provides additional timing headroom for peripheral servicing and control-loop execution, while the 2.4V minimum supply voltage supports integration into systems designed around low-voltage logic. Detailed RAM, timer, UART, GPIO, oscillator, and electrical-current information is not present in the supplied source data and should be confirmed in the manufacturer datasheet. Typical applications include simple motor controllers, industrial sequence-control boards, appliance-control modules, instrumentation interfaces, metering equipment, and compact embedded automation nodes. The through-hole 40-DIP package is particularly useful where production volumes are modest, prototype interchangeability is important, or automated through-hole assembly is already available. Firmware developers should use the manufacturer’s register definitions, memory map, and peripheral documentation when creating new designs. Design planning should begin with confirming the exact pinout, oscillator requirements, reset behavior, available peripheral functions, and memory map from the W78E051 family documentation. The 2.4V to 5.5V operating range does not establish the permissible voltage on every I/O pin, so signal-level compatibility must be verified separately. Decoupling and grounding should follow the datasheet reference layout rather than relying only on general 8052 conventions. This page consolidates verified distributor specifications, procurement links, application guidance, and explicit data gaps for the W78E051DDG. It distinguishes confirmed 8-bit, 40MHz, 4KB Flash, voltage, temperature, and package attributes from unreported specifications, helping engineers make an evidence-based procurement and design decision without filling unknown values with assumptions.

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W78E051DFG

W78E051DFG - 40MHz 8052 8-Bit MCU with 4KB Flash | Nuvoton

Nuvoton Technology Corporation W78E051DFG is an 8-bit 8052-compatible microcontroller operating up to 40 MHz, with 4 KB of flash program memory and 36 general-purpose I/O pins in a 44-pin QFP package. Its stated operating supply range is 2.4 V to 5.5 V, making it suitable for embedded control systems operating from a regulated 5 V rail or other compatible source. An 8052 microcontroller is an embedded microcontroller architecture combining a small general-purpose CPU core with program memory, data memory, parallel I/O, serial communication, timers, and system-control peripherals. The W78E051 series belongs to the broader microcontroller category, which sits above processor cores and below embedded-control semiconductor solutions used in industrial products, appliances, access controls, and compact automation equipment. The W78E051DFG provides 4 KB (4K x 8) of flash program memory for firmware storage and an operating speed of 40 MHz. Its listed peripherals include a power-on reset, watchdog timer, UART/USART interface, and external bus interface. The 36 available I/O pins provide substantial parallel connectivity for discrete inputs, output control, indicators, relays, and external interface signals without requiring a larger package. The device operates from 2.4 V to 5.5 V and is specified for industrial temperature conditions from -40 °C to 70 °C. Flash memory allows firmware to remain resident without a separate external memory component, simplifying both PCB routing and production programming. The 40 MHz clock rate also gives the 8-bit CPU more instruction throughput than lower-frequency 8051-class devices while retaining the familiar programming model. Typical uses include appliance controllers, keyboard and human-interface panels, access-control equipment, small motor or relay controllers, industrial interface modules, and compact embedded products. Its combination of 36 I/O pins, serial communication, external bus support, and watchdog protection is particularly useful when a design needs flexible parallel connectivity without a high-pin-count microcontroller package. When designing around the W78E051DFG, verify every peripheral, clock option, interrupt vector, and electrical limit against the current manufacturer datasheet before schematic release. The supplied search evidence confirms the principal specifications but does not expose the complete pin map, memory map, timing diagrams, or electrical characteristics needed for a production design. This page consolidates the verified distributor information, core MCU specifications, sourcing links, and design limitations for the W78E051DFG. It also separates confirmed facts from unavailable engineering data, helping engineers establish whether the 44-pin 8052-compatible device is appropriate before beginning a drop-in PCB or firmware evaluation.

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W78E051DLG

W78E051DLG - 8-Bit 40MHz 4KB Flash 8051 MCU | Nuvoton

The Nuvoton Technology Corporation W78E051DLG is an 8-bit 8052-compatible W78 series microcontroller with a 40 MHz operating frequency, 4 KB of programmable flash memory organized as 4K x 8, and a 48-pin LQFP package. It operates from a 2.4 V to 5.5 V supply, supporting both 5 V and 3.3 V embedded systems. A microcontroller, or MCU, is a semiconductor that integrates a CPU core, flash program memory, data memory, and peripherals into one device. Within the embedded-control hierarchy, the W78E051DLG belongs to the 8-bit 8051/8052 MCU family rather than a 16-bit or 32-bit microcontroller. Its role is to execute embedded firmware, monitor digital inputs, drive outputs, and communicate with sensors, actuators, human-interface devices, and industrial peripherals. The key specifications of this device are a 40 MHz clock, 4 KB flash for firmware storage, and a 2.4 V to 5.5 V operating range. Verified distributor listings describe the part as an 8052 W78 microcontroller with 4K x 8 flash and Pb-free construction. The 48-pin LQFP-48 package measures 7 mm by 7 mm and provides a practical pin count for external interfacing, clocking, reset, programming, and mixed-signal control applications. The 8052-compatible architecture is appropriate for cost-sensitive embedded designs that rely on established compiler, debugger, and programming-tool ecosystems. At 40 MHz, the processor offers considerably more instruction throughput than legacy 8-bit systems operating near 12 MHz or 24 MHz. The available verified data does not state the RAM capacity, peripheral set, oscillator options, ADC performance, or timer configuration, so those parameters should be confirmed in the manufacturer datasheet before final schematic or firmware design. Typical uses for the W78E051DLG include compact industrial controllers, appliance control boards, data-acquisition modules, LED and display systems, and 8-bit sensor-hub designs. The 36 I/O indicated in one distributor listing provides a practical basis for digital control, while the 4 KB flash limit makes the device best suited to firmware with modest code size. Applications requiring substantial buffer storage, high-resolution analog conversion, or large protocol stacks should verify those requirements before committing to the part. Design planning should begin by confirming the complete pin assignment, peripheral multiplexing, and programming interface in the manufacturer datasheet. The LQFP-48 footprint also requires deliberate decoupling, clock-routing, and reset-layout planning to avoid analog-noise coupling and startup problems. Because the verified listings provide only a partial specification set, procurement decisions should not rely on distributor summaries alone. This page consolidates distributor pricing, availability, package information, and verified electrical attributes while separating confirmed data from unconfirmed parameters. It also provides a same-family drop-in comparison framework and practical design notes that are not present in a standard distributor catalog entry.

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W78E051DPG

W78E051DPG - 8-Bit 40MHz 4KB Flash MCU | Nuvoton

Nuvoton Technology Corporation W78E051DPG is an 8-bit 8052-compatible microcontroller operating up to 40 MHz, with 4 KB of Flash program memory, 256 bytes of RAM, and 36 programmable I/O pins in a 44-LCC J-lead package. Its verified supply-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 70 °C. An 8-bit microcontroller is a compact embedded-control device whose processor, program memory, data memory, and peripherals are integrated on one semiconductor package. Within the broader hierarchy of microcontroller, embedded processor, and semiconductor, the W78 series combines an 8052-class architecture with deterministic I/O for cost-sensitive control systems. The W78E051DPG is intended for compact embedded controllers rather than high-compute systems where external memory, extensive connectivity, or large application code are required. Key characteristics include a maximum clock frequency of 40 MHz, 4 KB or 4K × 8 bits of Flash memory, 256 bytes of RAM, and 36 programmable pins. Integrated power-on reset and watchdog-timer functions are identified in the verified product listing. These resources support small control loops, digital I/O expansion, status monitoring, and basic sequencing without requiring a separate external nonvolatile-memory device for firmware storage. The device uses an 8052-compatible core and belongs to Nuvoton's W78 microcontroller family. Its 40 MHz operating capability provides substantially more instruction throughput than legacy 12 MHz 8051-class designs, while the compact 4 KB Flash budget keeps firmware architecture focused. The 36 programmable I/O pins offer a broad interface count for switches, indicators, relays, sensors, and external control logic when the board-level pin multiplexing and electrical limits are respected. Typical embedded uses include industrial control modules, appliance controllers, building equipment, small sensor nodes, and compact peripheral controllers. The 44-LCC J-lead package supports through-hole assembly and is useful when a product requires a mechanically robust package or inspection-friendly leads. The 2.4 V to 5.5 V operating range also permits integration with common low-voltage control systems, provided every connected peripheral shares a compatible logic level. The principal design trade-off is the limited 4 KB Flash and 256-byte RAM capacity. Firmware must be compact, stack depth must be checked carefully, and boundary-heavy algorithms may require a larger microcontroller. Exact pin multiplexing, peripheral behavior, reset timing, clock configuration, and absolute maximum ratings must be confirmed against the manufacturer datasheet before schematic release. This page consolidates verified distributor specifications, sourced operating limits, package information, application guidance, and procurement references. It also clearly separates verified facts from parameters that require confirmation, avoiding unsupported claims while providing a concise engineering starting point for the Nuvoton W78E051DPG.

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W78E052DDG

W78E052DDG - 40MHz 8-bit 8051 MCU | Nuvoton

The Nuvoton Technology Corporation W78E052DDG is an 8-bit 8051-compatible CISC microcontroller operating up to 40 MHz, with 8 KB of flash program memory, 256 bytes of RAM, 36 I/O pins, and a 40-pin DIP package. It operates across the verified 2.4 V to 5.5 V supply range and supports temperature grades identified as -40°C to 70°C by Mouser and -40°C to 85°C for the W78E052D family by Nuvoton. The product is listed as Not Recommended for New Designs. An 8051-compatible microcontroller is an embedded controller that executes instruction sets designed around the established 8051 architecture while extending it with modern flash memory and configurable peripheral resources. Within the product hierarchy, this device is a microcontroller, an embedded processing IC, and ultimately a semiconductor. Nuvoton describes the W78E052D family as a 6T/12T architecture configurable for compatibility with traditional 12T 8051 designs. Verified distinguishing features include an operating frequency of up to 40 MHz, 8 KB of 8K × 8 flash program memory, 256 × 8 RAM, and 36 general-purpose I/O lines. The 40-DIP package supports through-hole PCB assembly and is convenient for prototypes, legacy industrial controls, alarm systems, bar-code readers, KVM equipment, key phones, user interfaces, and IPC products. A single full-duplex UART is also identified for serial communications. The W78E052D family combines a 6T/12T selectable machine cycle with flash memory and a broad supply range. Faster 6T operation can reduce instruction-cycle timing compared with traditional 12T execution, while 12T compatibility helps preserve behavior expected by established 8051 designs. Designers must still verify oscillator, reset, timing, peripheral, and software assumptions against the manufacturer documentation before replacing an existing design. A through-hole DIP-40 MCU is most appropriate where manual assembly, socketed prototypes, repairability, or stable industrial availability matter more than minimum PCB area. The DIP package exposes 36 I/O pins alongside control and power functions, allowing substantial parallel digital connectivity but requiring careful planning for board height and connector clearance. The primary engineering trade-off is lifecycle status: Nuvoton marks the W78E052D family Not Recommended for New Designs. Existing supported programs may continue using available stock, but new designs should first evaluate the W78E054D or another currently recommended MCU and perform a complete software, electrical, and package migration review. This page consolidates distributor pricing, lifecycle information, application context, verified specifications, and drop-in assessment data that are distributed across manufacturer and distributor pages. Engineering decisions should remain anchored to the manufacturer datasheet rather than distributor summaries alone.

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W78E052DFG

W78E052DFG - 8-Bit 8051 8KB MCU | Nuvoton | Embedded Control

The Nuvoton Technology Corporation W78E052DFG is an 8-bit 8051-compatible microcontroller with 8KB of Flash program memory, a 2.4V to 5.5V operating-voltage range, and support for frequencies up to 40MHz according to the supplied product references. It is offered in a 44-pin QFP package. The device belongs to the W78E052D family of configurable 6T/12T 8051 microcontrollers and is intended for embedded control applications involving security and alarm systems, barcode readers, KVM equipment, telephones, user interfaces, and industrial control products. An 8051 microcontroller is an embedded processing IC that combines a compact 8-bit CPU, program memory, data memory, and peripherals on one device. In the product hierarchy, the W78E052DFG is a microcontroller, which is a type of embedded processor and system-on-chip used in power management, industrial automation, access control, human-interface, and communications equipment. Its traditional 8051 architecture can support established toolchains and software while the W78E052D family adds configurable 6T or 12T operation. The principal documented features include 8KB of Flash memory, operation from 2.4V through 5.5V, and compatibility with traditional 12T 8051 devices. A Globalspec listing identifies the device as an 8-bit, 40MHz MCU with 8KB of Flash. Manufacturer information describes the W78E052D as configurable for 6T or 12T operation, making it suitable for designs that require a familiar 8051 software model across multiple package and frequency configurations. The W78E052DFG is specifically identified for a 44-pin QFP package. This surface-mount package supports compact PCB construction without requiring a through-hole socket. The supplied Nuvoton Direct result lists LQFP48, PLCC44, PQFP44, TQFP44, and DIP40 as package options within the broader W78E052D family; the exact package ordering code must therefore be checked against the package drawing when replacing or redesigning a board. Typical application areas include security and alarm panels, barcode-reader controllers, keyboard-video-mouse or KVM interfaces, key telephones, compact user-interface modules, and industrial control equipment. For these systems, the important selection criteria are the 8KB code-memory capacity, 2.4V to 5.5V supply range, 8-bit processing capability, and availability of the required package and peripheral configuration. Designers should confirm the full clock, memory, peripheral, and electrical limits in the manufacturer datasheet before release. Because the family description gives broad package and temperature information, the exact ordering code must be used to confirm the device variant. The Mouser listing also specifies a Pb-free finish and a -40°C to 70°C range, while the Nuvoton product information gives a -40°C to 85°C family range, so variant-specific qualification data should control. This page consolidates the verified manufacturer description, distributor specifications, pricing reference, lifecycle status, and package information for W78E052DFG. It also distinguishes documented facts from unavailable details, providing engineers with a concise basis for initial design review while clearly identifying the datasheet and authorized distributor sources needed for final qualification.

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W78E052DLG

W78E052DLG - 8-bit 8051 MCU, 8KB Flash, 48-LQFP | Nuvoton

The Nuvoton Technology Corporation W78E052DLG is an 8-bit 8051-compatible microcontroller with 8KB flash memory, a 2.4 V to 5.5 V operating-voltage range, and a 48-LQFP package. The W78E052D family is configurable and pin-compatible with traditional 12T 8051 devices, providing a practical migration path for embedded industrial-control, security, alarm, barcode-reader, KVM, keypad, user-interface, and IPC designs. The device is offered in a Pb-free configuration according to distributor product information, and the manufacturer lists the W78E052D family as Not Recommended for New Designs (NRND). An 8-bit microcontroller is a compact embedded-controller category used to execute firmware, read inputs, control outputs, and manage system behavior in cost-sensitive electronics. Within the broader hierarchy, the W78E052DLG is a microcontroller, an embedded-processing IC, and a semiconductor designed around the established 8051 instruction set and peripheral ecosystem. Its 8KB flash capacity is suitable for small control routines and product-specific firmware, while its broad supply-voltage range supports both 3.3 V and 5 V system designs. The key verified attributes include 8-bit processing, 8KB flash, 2.4 V to 5.5 V operation, a 48-LQFP package, and a manufacturer-described 6T/12T 8051 architecture configurable for compatibility with traditional 12T 8051 designs. The -40 °C to +85 °C operating-temperature range applies to the W78E052D family, while distributor material identifies the Pb-free W78E052DLG ordering code for operation from -40 °C to +70 °C. Exact RAM, clock, peripheral, and electrical timing values should be confirmed in the manufacturer datasheet before layout or firmware deployment. Typical uses include security and alarm panels, barcode readers, KVM controllers, key phones, compact user-interface modules, and industrial-control equipment. In these systems, the microcontroller consolidates low-speed control logic while external components provide sensors, communications, displays, actuators, and power regulation. The 48-LQFP format offers enough pins for mixed signal and peripheral connectivity while remaining compatible with conventional surface-mount assembly. Designers should verify the exact pin assignments, oscillator requirements, reset behavior, port-drive limits, and decoupling recommendations against the W78E052D datasheet. Because the family is NRND, new production designs should compare current Nuvoton 8051 options, while existing production can evaluate an explicitly documented drop-in alternative only after checking timing, firmware, mixed-signal, and lifecycle requirements. This page combines verified manufacturer and distributor information, procurement data, lifecycle context, package details, and practical selection guidance. It also clearly identifies where package, timing, memory, and pricing details require confirmation rather than presenting unsupported assumptions as guaranteed specifications.

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W78E052DPG

W78E052DPG - 8-Bit 40MHz 8052 MCU | Nuvoton | PLCC-44

Nuvoton Technology Corporation W78E052DPG is an 8-bit 8052-compatible W78 CISC microcontroller rated up to 40 MHz, with 8 KB of flash program memory, in a 44-pin PLCC package. The device operates across the broad 2.4 V to 5.5 V supply range identified in the verified distributor data, supporting both 2.5 V, 3.3 V, and 5 V system rails. Its -40 °C to +70 °C Mouser rating makes the part suitable for mainstream industrial, embedded-control, security, alarm, barcode-reader, KVM, key-phone, user-interface, and IPC equipment. An 8051-family microcontroller is a compact CISC controller within the broader embedded-processor and semiconductor hierarchy. Its instruction set and integrated program memory are optimized for control-oriented tasks rather than high-bandwidth computation. The W78E052D family combines that established 8051 execution model with selectable clock configurations, allowing designers to choose an operating frequency appropriate to the required response time and peripheral activity. The W78E052DPG provides 8 KB of flash memory organized as 8K x 8, providing on-chip program storage without an external memory device for many firmware sizes. Its maximum stated clock frequency of 40 MHz supports faster control loops and responsive peripheral handling. Operation from 2.4 V to 5.5 V also permits integration into both legacy 5 V equipment and modern 3.3 V embedded systems without requiring a separate level-shifting interface for the MCU supply. The controller uses the 8052-compatible CISC architecture identified by DigiKey and Octopart. This architecture is appropriate for industrial interfaces, keypads, alarms, readers, and compact embedded controllers where deterministic instruction execution, compact firmware support, and peripheral integration matter more than the processing power of a 32-bit MCU. The 44-pin PLCC package exposes the controller's I/O and communication resources while supporting leaded-board assembly. Typical designs include security and alarm panels, barcode readers, keyboard-video-mouse or KVM controllers, telephone keypads, user-interface controllers, and industrial IPC modules. The family is listed as NRND, so engineers should confirm availability, lifecycle expectations, and transition planning before beginning a new high-volume design. Existing equipment can continue to be supported where exact firmware and package continuity are required. For a new PCB, use the exact PLCC-44 footprint, preserve the required bypass and oscillator connections shown by the manufacturer datasheet, and validate the programmed clock configuration against the selected supply voltage. If software timing depends on instruction cycles, verify the operating-frequency limits and timing assumptions before production release. This page consolidates verified distributor specifications, lifecycle information, sourcing links, comparison criteria, and practical replacement guidance. It also distinguishes the exact W78E052DPG ordering code from related W78 devices whose memory, package, or clock characteristics may prevent a literal drop-in replacement.

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W78E054DDG

W78E054DDG - 8-Bit 40MHz 16KB Flash MCU | Nuvoton

Nuvoton W78E054DDG is an 8-bit 8052-compatible microcontroller rated up to 40 MHz, with 16 KB of Flash program memory and operating from 2.4 V to 5.5 V. The device is supplied in an LQFP-48 package and is positioned for embedded security, alarm, barcode-reader, KVM, key-phone, user-interface, and industrial-control systems. Its 32 I/O pins provide a practical interface count for digital control and communication designs. An 8-bit microcontroller is a compact embedded-processing IC built around an 8-bit CPU, program memory, data memory, timers, serial interfaces, and digital I/O. The W78E054D belongs to the broader 8051/8052 microcontroller family and combines legacy peripheral compatibility with a wider operating-frequency range. Its selectable 6T or 12T architecture is designed to support traditional 12T 8051-compatible hardware while accommodating higher clock rates. Principal device characteristics include a 40 MHz maximum operating frequency, 16 KB of Flash program memory, 32 I/O pins, a 2.4 V to 5.5 V supply range, and an external oscillator configuration. Flash memory retains programmed firmware without a removable programmer, while the broad supply-voltage range supports both 3.3 V and 5 V equipment when the associated peripheral and I/O limits are respected. The W78E054D uses the 8052 processor architecture and provides a conventional register-based embedded-control platform. Nuvoton describes the family as configurable and pin-compatible with traditional 12T 8051 implementations. That compatibility makes migration from an appropriately designed 8051 system possible, although firmware, timing, oscillator, and peripheral behavior should still be verified before production use. Typical applications include electronic access controls, alarm panels, barcode readers, keyboard-video-mouse equipment, key-phone systems, industrial human-interface panels, and embedded industrial controllers. The 32 available I/O pins are especially useful when a design must combine sensing inputs, relay or actuator outputs, display interfaces, and serial communication without using a larger package. The principal engineering consideration is that this device has an external oscillator rather than a listed internal oscillator. The clock source, capacitance, startup behavior, and all timing-dependent firmware must therefore be designed for the external clock configuration. Designers should also confirm the exact LQFP-48 pin mapping and the latest Nuvoton datasheet before committing a new PCB. This product page combines verified distributor pricing, lifecycle information, package characteristics, and application guidance with explicit identification of the remaining pinout and supply-chain details. It also distinguishes confirmed drop-in replacements from related family members that were not verified as exact replacements, helping engineers avoid assumptions based only on similar part numbers.

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W78E054DFG

W78E054DFG - 40MHz 8-Bit 8051 MCU | Nuvoton | 16KB Flash

Nuvoton Technology Corporation W78E054DFG is an 8-bit 8051-compatible microcontroller operating at up to 40 MHz, with 16 KB of internal flash memory and a 44-pin PQFP package. It supports a 2.4 V to 5.5 V operating-voltage range and an industrial temperature range of -40°C to 85°C. The W78E054D family combines a traditional 8051 core with modern embedded-control functionality for security, alarm, barcode-reader, KVM, keypad, user-interface, and IPC equipment. An 8-bit 8051 microcontroller is an embedded-processing IC built around the 8051 instruction set and a compact register and memory architecture. Within the semiconductor hierarchy, it belongs to the microcontroller category, combining a CPU core, program memory, data memory, timers, serial interfaces, and interrupt-control resources on one integrated circuit. The W78E054D is marketed as a 6T or 12T 8051 MCU that is configurable and pin-compatible with traditional 12T 8051 designs. Key characteristics include an 8-bit processing engine, a maximum clock frequency of 40 MHz, and 16 KB of flash memory organized as 16K by 8 bits. Its operating range of 2.4 V to 5.5 V allows use in both 3.3 V and 5 V equipment. The 44-pin PQFP package provides a surface-mount option for compact control boards, while the -40°C to 85°C rating supports industrial-temperature deployments. The W78E054D/W78E052D series is designed to accommodate a wider frequency range with low power consumption. Its 8051-compatible architecture supports familiar instruction set and peripheral conventions, easing firmware migration from suitable legacy 8051 products. Because it is specified as configurable and pin-compatible with traditional 12T 8051 devices, board-level compatibility depends on the selected package suffix, oscillator implementation, reset circuitry, and the exact functions assigned to shared pins. Typical applications include electronic security systems, alarm panels, barcode readers, KVM controllers, industrial telephones, compact human-machine interfaces, and embedded IPC equipment. These systems benefit from the combination of 16 KB flash, 40 MHz processing capability, and a 2.4 V to 5.5 V supply range. The 44-pin PQFP format is particularly appropriate for volume-produced industrial and commercial control products that require a surface-mount assembly process. Designers should verify oscillator, reset, and peripheral connections directly against the manufacturer datasheet before replacing an existing 12T 8051. The W78E054 family is pin-compatible with traditional 12T devices when the corresponding configuration and package are used, but firmware, memory, timing, and peripheral availability must also be reviewed. The W78E054D is currently marked Not Recommended for New Designs, so existing-product maintenance may be more appropriate than new platform selection. This page combines verified manufacturer and distributor information with lifecycle context, application guidance, package constraints, and a strictly filtered drop-in comparison. It distinguishes confirmed W78E054D attributes from parameters that remain unavailable in the supplied source data, helping engineers evaluate procurement and redesign decisions without treating generic 8051 specifications as guaranteed W78E054DFG facts.

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W78E054DLG

W78E054DLG - 40MHz 8052 8-Bit 16KB MCU | Nuvoton | LQFP-48

Nuvoton Technology Corporation W78E054DLG is an 8-bit 8052-compatible microcontroller operating up to 40 MHz, with 16 KB of flash memory and a 48-pin LQFP package. The verified listing specifies a 2.4 V to 5.5 V operating range, a -40 °C to 70 °C temperature range, Pb-free construction, and an 8052 instruction set. These characteristics place the W78E054DLG in the broader 8-bit embedded-control MCU category, where on-chip flash, digital I/O, timing resources, and serial peripherals are combined for compact control designs. An 8-bit microcontroller is a microprocessor core designed primarily for embedded control rather than desktop computing. The W78E054D/W78E052D family extends the 8052 architecture to higher operating frequencies and provides integrated program memory for standalone applications. At up to 40 MHz, the device is suitable for systems requiring fast deterministic I/O handling while remaining manageable in an 8-bit software ecosystem. Its 48-LQFP package exposes substantially more I/O than smaller packages while remaining compatible with automated PCB assembly. The verified features emphasize a 16 KB flash program-memory capacity, 40 MHz maximum clock operation, and a broad 2.4 V to 5.5 V supply range. The 2.4 V minimum operating voltage supports low-voltage designs, while the upper limit allows operation from conventional 5 V systems. The stated -40 °C to 70 °C commercial temperature range supports industrial equipment, instrumentation, appliances, access controls, and compact controller modules that do not require the wider temperature limits associated with extended-temperature components. As an 8052-compatible device, the W78E054DLG can execute standard 8051-family instructions while benefiting from the faster clock and denser flash implementation in this family. The verified data identifies the device as a 16K × 8 flash MCU, providing 16,384 bytes of program storage. Detailed RAM organization, interrupt-vector arrangement, peripheral configuration, oscillator requirements, and electrical timing values are not included in the supplied excerpts and should be confirmed against the manufacturer datasheet before schematic or firmware release. Typical application areas include small industrial controllers, sensor-conditioning and data-acquisition modules, motor and relay control, security and access-control equipment, and consumer appliances. Its 48-LQFP footprint is particularly useful when a design needs more external connections than a small-outline microcontroller can provide. In each case, firmware must account for the device's 8-bit architecture and peripheral assignment shown in the authoritative pinout and reference manual. A critical design step is to verify every power, clock, reset, and I/O connection against the official W78E054D/W78E052D datasheet before PCB layout. The supplied search excerpts do not expose the complete pin names, exposed-pad arrangement, decoupling requirements, or recommended external components. Engineers should also confirm the oscillator source, programming interface, reset strategy, unused-pin treatment, and operating voltage tolerance for the assembled production configuration. This product record consolidates verified distributor pricing, package information, operating limits, and sourcing links into one engineering reference. It also separates confirmed parameters from missing datasheet details, helping designers avoid assumptions about pin compatibility, replacement parts, memory availability, or peripheral behavior while preserving traceability to current market data.

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W78E054DPG

W78E054DPG - 8-Bit 40MHz 8051 MCU | Nuvoton

The Nuvoton Technology Corporation W78E054DPG is an 8-bit W78 8052-compatible microcontroller with 16KB (16K x 8) Flash program memory, 256 x 8 bits of RAM, 36 I/O pins, and a maximum operating frequency of 40MHz. The device is supplied in a 44-pin PLCC package and operates from 2.4V to 5.5V over a -40°C to +85°C temperature range. An 8-bit microcontroller is a compact embedded-control processor designed to execute firmware, read inputs, and control outputs in equipment such as security systems, barcode readers, industrial controllers, user interfaces, and communication products. Within the semiconductor hierarchy, the W78E054DPG belongs to the 8051-compatible MCU family, combining a CISC instruction set with integrated program memory, data memory, timers, serial interfaces, and parallel I/O. The W78E054DPG provides 16KB of Flash memory for firmware storage and 256 x 8 bits of RAM for working data. Its 36 available I/O lines support external sensors, switches, indicators, actuators, and peripheral interfaces. The configurable 6T/12T architecture and external oscillator provide flexibility for designs based on the traditional 12T 8051 interface. Operation across 2.4V to 5.5V also accommodates legacy 2.5V, 3.3V, and 5V system environments. The maximum clock frequency of 40MHz makes the device suitable for control tasks that require deterministic embedded processing without a higher-cost application processor. Its 8052-compatible architecture supports established 8051 development methods, while the integrated Flash memory permits field-programmable firmware rather than a mask-programmed ROM implementation. The PLCC-44 package is intended for socketed or board-level assembly where serviceability and a compact leaded footprint are important. Typical applications include alarm and security panels, barcode-reader interfaces, keyboard and telephone equipment, kiosk and user-interface controllers, industrial peripherals, and compact embedded IPC systems. For these uses, the combination of 36 I/O pins, 16KB Flash, 256 x 8-bit RAM, and 2.4V to 5.5V operation provides sufficient resources for supervisory control, protocol handling, and peripheral coordination. Designers should verify oscillator, reset, and memory-interface requirements against the manufacturer datasheet before layout. Because the product is classified Not Recommended for New Designs, existing equipment maintenance can justify sourcing this NRND device, but new platforms should assess currently supported Nuvoton MCU families rather than assuming long-term availability. This product record combines manufacturer lifecycle information, distributor specifications, packaging data, and application-focused engineering guidance. It also distinguishes verified source data from unavailable commercial information, making the W78E054DPG easier to evaluate for legacy-system maintenance without presenting unverified pricing, pin assignments, or replacement claims as facts.

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W78E058DDG

W78E058DDG - 8-Bit 40MHz 32KB Flash MCU | Nuvoton | DIP-40

Nuvoton Technology Corporation W78E058DDG is an 8-bit W78 8051-compatible microcontroller with 40 MHz operating frequency, 32 KB of flash program memory, 512 bytes of RAM, and 36 I/O pins in a 40-pin DIP package. The device is designed for embedded control applications requiring a familiar 8051 instruction set, integrated flash memory, and operation from a 2.4 V to 5.5 V supply range. Its 40-pin DIP construction supports prototyping, legacy-controller upgrades, and through-hole industrial control assemblies. An 8051-compatible microcontroller is an embedded-processing IC built around the classic 8051 core architecture. It combines a CPU, program memory, data memory, parallel I/O, timers, serial communication functions, and interrupt support on one device. The W78E058 series extends that established platform with on-chip flash rather than relying on an external program-memory device. Within the semiconductor hierarchy, this part belongs to the microcontroller class and the more specific 8-bit embedded-controller category. The principal features include 32 KB (32K × 8) flash, 512 × 8 bits of RAM, 36 I/O pins, and a maximum stated operating frequency of 40 MHz. The 2.4 V to 5.5 V operating range permits use in 2.5 V, 3.3 V, and 5 V equipment. According to the manufacturer W78E058D product information, the family is configurable and pin-compatible with traditional 12-transistor 8051 devices, while package options include DIP40. The selected W78E058DDG ordering code corresponds to the 40-pin DIP configuration. Internally, the MCU follows the CISC-oriented 8051 execution model and uses a W78 core with integrated flash program storage. The 40 MHz clock rating provides substantially more timing headroom than traditional 12 MHz-class 8051 implementations, supporting faster peripheral operation and more demanding control loops. Because interrupt-driven and polling architectures remain central to 8051 designs, existing toolchains and software practices can often be adapted, although the W78E058D documentation must be consulted for peripheral behavior and clock requirements. Typical uses include industrial controller boards, appliance control panels, keyboard and human-interface modules, programmable timers, data-acquisition controllers, and legacy peripheral upgrades. The 36 available I/O pins are especially useful when a system needs multiple digital inputs and outputs around a single controller. For designs requiring more analog functions, communication nodes, or compact surface-mount packaging, a different microcontroller family may provide a better integration level. When designing a PCB around the W78E058DDG, preserve the documented 40-pin DIP footprint and provide suitable bypass capacitance at the power pins. Validate oscillator timing, reset behavior, and I/O drive limits against the manufacturer datasheet before production. Migration from a conventional EPROM-based 8051 should also include checks for flash-specific programming, erase, and code-execution behavior. This product page consolidates verified distributor specifications, manufacturer family information, package constraints, and practical design guidance. It also distinguishes a genuine 40-pin drop-in option from candidates whose memory, speed, or package differences require schematic and firmware verification before substitution.

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W78E058DFG

W78E058DFG - 8-Bit 40MHz 32KB Flash MCU | Nuvoton

The Nuvoton Technology Corporation W78E058DFG is an 8-bit 8052-compatible W78 microcontroller with a 40 MHz maximum speed and 32 KB of flash program memory in a 44-pin PQFP package. It operates from 2.4 V to 5.5 V, providing a broad supply-voltage range for embedded industrial control, IoT equipment, automation, motor-control, metering, and low-power board designs. The device also provides 512 bytes of RAM and 36 I/O pins according to the verified technical listing. An 8-bit microcontroller is a compact embedded processor designed to execute firmware that senses inputs, controls outputs, and manages communication or timing tasks. The W78E058DFG belongs to the W78 8051-family hierarchy, where the 8052 CPU combines an 8-bit CISC architecture with integrated program memory, RAM, and peripheral functions. This places it between general-purpose microcontrollers and simple fixed-function controllers for designs requiring flexible firmware-based behavior. The primary verified features are 32 KB of flash program memory, 512 bytes of internal RAM, a 40 MHz operating speed, 36 I/O pins, and a 2.4 V to 5.5 V supply range. Its 44-pin PQFP form factor supports conventional leaded-board assembly and provides more connection positions than smaller 8-bit packages. The W78E058D family is also described by Nuvoton as configurable and pin-compatible with traditional 12T 8051 designs, making the device relevant to legacy 8051 board upgrades when the electrical and peripheral requirements are matched. The W78E058D family uses an 80C51-compatible CISC architecture. Program storage in flash supports firmware revision and configuration tasks that are more difficult with mask-programmed devices, while 512 bytes of RAM support working variables, stack operations, and small data buffers. A 40 MHz clock rating provides additional timing headroom for multi-step serial communication, control loops, and periodic peripheral servicing, although actual throughput depends on the instruction mix and firmware implementation. Typical application areas include industrial controllers, connected sensing equipment, compact automation controllers, motor-control interfaces, utility or product metering, and embedded IoT nodes. The 36 available I/O positions are particularly useful when a system needs discrete sensing and actuator connections in addition to its serial interfaces. Firmware and peripheral configuration should be checked against the selected W78E058D package variant before design release. For hardware design, use the 44-pin PQFP land pattern, validate the selected oscillator and reset implementation against the manufacturer datasheet, and place bypass capacitors close to the supply pins. The permitted operating range of 2.4 V to 5.5 V must also be checked for every attached peripheral and communication device. The supplied search results do not expose the complete pin map, so pin assignments should not be inferred from generic 8051 diagrams without cross-checking the official data.

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W78E058DLG

W78E058DLG - 8-Bit 40MHz 32KB Flash MCU | Nuvoton

Nuvoton Technology Corporation W78E058DLG is an 8-bit 8051-compatible microcontroller operating from 2.4 V to 5.5 V, with a 40 MHz clock, 32 KB of Flash memory, and a 48-pin LQFP package measuring 7 mm by 7 mm. The distributor data identifies this device as a Pb-free part associated with the W78E058 series and an operating temperature range of -40 °C to 70 °C. An 8-bit microcontroller is a compact embedded-control IC used to execute firmware, read inputs, control outputs, and coordinate peripheral functions. In the product hierarchy, the W78E058DLG is a microcontroller, a programmable semiconductor, and a member of Nuvoton's 8051-family devices. Its 40 MHz operating clock provides the execution rate for embedded control tasks, while its 32 KB Flash memory provides nonvolatile program storage for application firmware. The principal verified characteristics are the 8-bit CPU architecture, 40 MHz maximum clock, 32 KB Flash configuration, 512-byte Flash information area reported by LCSC, 2.4 V to 5.5 V supply range, and 48-LQFP package. These parameters position the device for compact embedded systems operating from conventional 5 V supply rails or lower-voltage circuitry within the stated range. The supplied distributor records do not expose detailed RAM size, peripheral configuration, timer channels, ADC characteristics, or package pin assignments. The W78E058DLG combines embedded processing and Flash program storage in a surface-mount LQFP-48 format. Its 7 mm by 7 mm body provides a mechanically manageable option for leaded through-hole assembly where a QFN package would be unsuitable. At 40 MHz, the device offers substantially more timing headroom than legacy 8051 systems commonly clocked at much lower frequencies, although actual response time still depends on the instruction mix and firmware workload. Typical engineering uses include compact industrial controllers, appliance-control modules, motor-control peripherals, data-acquisition front ends, and embedded sensor interfaces when the selected firmware and external circuitry match the device's documented resources. The 5.5 V maximum supply supports conventional industrial and consumer logic environments, while the 2.4 V minimum allows operation from suitably regulated lower-voltage rails. Design work should begin by confirming every required peripheral, memory resource, and package pin against the manufacturer datasheet before schematic capture. Designers should not infer ADC, timer, serial-interface, or GPIO capabilities from the family name alone because those details were not present in the supplied verified data. The 48-pin LQFP footprint also requires adequate routing space around all leads and appropriate solder-assembly profile control. This page consolidates the exact distributor-reported W78E058DLG specifications, current pricing evidence, sourcing links, and replacement-status information. It also separates verified facts from unresolved attributes, helping engineers avoid treating distributor snippets as a substitute for the complete manufacturer datasheet when making PCB or firmware decisions.

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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

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

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

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

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

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

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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