W78E051DLG - 8-Bit 40MHz 4KB Flash 8051 MCU | Nuvoton
MPN： W78E051DLG ✓ 啟用中W78E051DLG 概覽
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.
直接替換替代品，適用於 W78E051DLG — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： W78E051DLG （相同外形與佔位） — 差異在於 Core Architecture, Microcontroller Type.
W78E052DLG
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →W78E054DLG
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
W78E055DLG
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
W78E056DLG
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
W78E051DLG 最大額定值與電氣特性
| Microcontroller Type | 8-bit 8052-compatible W78 microcontroller |
| 最大時脈頻率 | 40 MHz |
| Flash Memory Size | 4 KB |
| Flash Organization | 4K x 8 |
| 工作電源電壓 | 2.4 V to 5.5 V |
| Number of I/O Pins | 36 pins |
| Package Type | 48-pin LQFP |
| Package Dimensions | 7 mm x 7 mm |
| 工作溫度範圍 | -40C to +70C |
| Lead-Free Status | Pb-free |
| RoHS 狀態 | Compliant |
| Core Architecture | 8052-compatible 8-bit embedded core |
| 安裝類型 | Surface mount |
W78E051DLG 7 mm x 7 mm 腳位配置指南
W78E051DLG（7 mm x 7 mm 封裝）的腳位配置。 此數位 IC 包含 GPIO、通訊介面（UART、SPI、I2C）與電源腳位。替代腳位功能與配置選項請參閱製造商資料表。對嵌入式系統設計與 PCB 佈局至關重要。
無詳細腳位定義資料： W78E051DLG.
請參閱 資料表 以查看完整腳位配置。
典型應用
W78E051DLG 適用於 6 應用s: Compact Industrial Control Boards, Appliance and Household Controller, LED Lighting and Display Control, Serial Data Acquisition Module, RS-485 Field-Bus Sensor Hub, Educational and Embedded Processor Training.
Compact Industrial Control Boards
The W78E051DLG fits compact industrial control boards where an 8-bit controller, 36 reported I/O pins, and a 2.4 V to 5.5 V supply range are sufficient. It can supervise relay outputs, read discrete sensors, and manage machine-state logic without the memory cost of a 32-bit MCU. The 40 MHz operating frequency provides additional instruction headroom over legacy 8051 designs, while the 4 KB flash limit requires a disciplined firmware budget and frequent code-size review. Confirm watchdog, isolation, and EMC requirements during industrial qualification.
推薦
Appliance and Household Controller
The W78E051DLG can serve as the central controller in a compact appliance or household device that uses discrete buttons, LEDs, relays, and simple sensors. Its 8052-compatible instruction set supports established embedded toolchains, and the 48-pin LQFP-48 package provides enough connections for control signals without requiring a very large PCB. The 4 KB flash capacity is appropriate for firmware with modest state logic; standby behavior, wake sources, and timer resources should be verified in the manufacturer datasheet. A 3.3 V implementation is possible within the stated 2.4 V to 5.5 V range.
推薦
LED Lighting and Display Control
The W78E051DLG is suitable for LED-lighting controllers and compact display-control boards where the required behavior is limited to pattern generation, button handling, and status monitoring. Its 36 reported I/O pins allow multiple LED or switch signals to be managed, while the 40 MHz clock provides useful margin for timed multiplexing or debouncing. Because the 4 KB flash limit restricts graphical rendering and elaborate effects, a larger-flash W78E05 family member may be preferable when assets or complex animation data are required. Verify PWM channels and maximum port drive current before assigning LED loads.
推薦
Serial Data Acquisition Module
The W78E051DLG can act as the supervisory controller in a modest serial data-acquisition module that receives commands, validates basic measurements, and formats output. Its 8052-compatible core and 40 MHz clock are adequate for protocol framing and supervisory logic, while the LQFP-48 footprint leaves more I/O than a small 20-pin package. The confirmed 4 KB flash and unknown RAM capacity make this most appropriate for short firmware with bounded data buffers. Verify UART count, baud-rate tolerance, and the peripheral clocking arrangement in the manufacturer datasheet.
推薦
RS-485 Field-Bus Sensor Hub
The W78E051DLG is a reasonable candidate for a small RS-485 sensor hub that polls digital or simple analog sensors and reports their state to a host. The 40 MHz processor supports responsive serial handling, and the reported 36 I/O pins provide a practical margin for indicators, configuration switches, and bus isolation controls. Firmware must remain within the 4 KB flash limit, and the absence of verified RAM, ADC, and UART details prevents a definitive design release. The -40C to +70C listing supports commercial-temperature indoor equipment rather than unqualified outdoor deployment.
推薦
Educational and Embedded Processor Training
The W78E051DLG is well suited to instruction, evaluation boards, and embedded-systems training because it combines a legacy-compatible 8-bit architecture with a modern 40 MHz operating frequency and a readily sourced 48-LQFP footprint. Students can exercise timer-based control, serial communication, interrupt handling, and flash-resident firmware without the complexity of a 32-bit development platform. The small 4 KB flash space also teaches useful embedded budgeting and code-size discipline. A practical lab should still include the programming interface, a regulated supply, decoupling, and a logic-compatible debug adapter confirmed by the manufacturer.
推薦
推薦產品摘要
工程參考資料，適用於 W78E051DLG — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | W78E052DLG | W78E054DLG | W78E055DLG | W78E056DLG |
|---|---|---|---|---|---|
| Brand | Nuvoton Technology Corporation | Nuvoton Technology Corporation | Nuvoton Technology Corporation | Nuvoton Technology Corporation | Nuvoton Technology Corporation |
| Package | LQFP-48 (7x7 mm) | LQFP-48 (7x7 mm) - same footprint | LQFP-48 (7x7 mm) - same footprint | LQFP-48 (7x7 mm) - same footprint | LQFP-48 (7x7 mm) - same footprint |
| CPU Architecture | 8-bit 8052-compatible W78 core | 8-bit 8052-compatible W78 core | 8-bit 8052-compatible W78 core | 8-bit 8052-compatible W78 core | 8-bit 8052-compatible W78 core |
| Maximum Clock Frequency | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| Flash Memory | 4 KB (4K x 8) | 8 KB | 16 KB | 32 KB | 64 KB |
| Operating Supply Voltage | 2.4 V to 5.5 V | 2.4 V to 5.5 V | 2.4 V to 5.5 V | 2.4 V to 5.5 V | 2.4 V to 5.5 V |
| Number of I/O Pins | 36 pins | 36 pins | 36 pins | 36 pins | 36 pins |
| Operating Temperature Range | -40C to +70C | -40C to +70C | -40C to +70C | -40C to +70C | -40C to +70C |
主要差異化特點
- Smallest confirmed flash option in the compared W78E05 LQFP-48 set (對比W78E052DLG)
- Confirmed 40 MHz operating frequency for the target device (對比W78E054DLG)
- Lower-voltage operation within a 2.4 V to 5.5 V range (對比W78E055DLG)
- Practical 48-pin surface-mount footprint with 36 reported I/O (對比W78E056DLG)
設計說明
Place the MCU supply bypass capacitor immediately across the associated VDD and VSS pins rather than at the edge of the board. Route the oscillator and reset signals away from switching nodes and high-current load drivers. The verified data confirms a 48-pin LQFP-48 package but does not provide the numbered pin map, so the land pattern, decoupling positions, exposed supply pins, and programming pins must be taken directly from the manufacturer package drawing before PCB release.
Do not treat the distributor's 40 MHz headline as proof that every clock configuration runs at 40 MHz. Verify the permissible oscillator range and any relationship among supply voltage, machine cycle, and clock speed in the manufacturer datasheet. Likewise, 36 reported I/O pins do not establish that every port can simultaneously source the maximum current needed by relays, LEDs, or displays. Confirm port drive strength and total supply-current limits before assigning loads.
The 2.4 V to 5.5 V operating range supports both 3.3 V and 5 V systems, but every connected device must share a compatible logic level or require level translation. Include local decoupling, a regulator with appropriate transient margin, and a defined power-up sequence. If the board connects to motors, relays, or long external cables, add separate protection and filtering so switching transients do not corrupt the MCU supply or clock reference.
Firmware must be sized against the confirmed 4 KB flash limit, including the bootloader, interrupt vectors, constants, and room for future revisions. Build a release check into the firmware pipeline that fails when code and read-only data exceed the device limit. Because RAM capacity, ADC channels, UART resources, and timer functions were not provided in the verified data, avoid final peripheral allocation until the current manufacturer datasheet and pin multiplexing table have been checked.
Keep sensitive analog or sensor inputs away from oscillator, high-current LED, relay-driver, and switching-power traces. Provide a quiet return path beneath the device and isolate analog routing from digital switching where the board area allows. If the W78E051DLG is used for measurement rather than discrete-only control, obtain the verified ADC architecture, reference voltage, acquisition time, and input-impedance requirements before finalizing the front end.
合規資訊
The LCSC product listing identifies the W78E051DLG as RoHS compliant, and the Mouser listing identifies it as Pb-free. The commercial -40C to +70C rating is not an automotive qualification. REACH, halogen-free, and conflict-minerals declarations were not present in the supplied data and are therefore recorded as unknown.