W78I054DDG - 8-Bit 40MHz 8051 MCU | Nuvoton Technology
部品番号: W78I054DDG ✓ 生産中W78I054DDG 概要
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.
ドロップイン代替品: W78I054DDG — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: W78I054DDG （同一形状・フットプリント） — 相違点: Architecture, Package, Flash Memory, Microcontroller Type, Operating Temperature Range.
W78E054DDG
✅ ドロップイン📋 参考代替品（カタログ未掲載）
W78E052DDG
✅ ドロップイン価格はお問い合わせください
データシートを見る →W78I054DDG 最大定格＆電気的特性
| Microcontroller Type | 8-bit 8051-compatible microcontroller |
| Maximum CPU Frequency | 40 MHz |
| Operating Voltage Range | 2.4 V to 5.5 V |
| Flash Memory | 16 KB or 32 KB across verified distributor listings; confirm exact variant |
| パッケージ | 40-pin DIP |
| 実装タイプ | Through-hole |
| 動作温度範囲 | -40°C to 85°C |
| Core Compatibility | 8051-compatible |
| Program Memory Type | Flash |
| Lead-Free Status | Pb-free |
| RoHS ステータス | Compliant |
| Manufacturer Product Family | W78 8-bit 8051 series |
| Architecture | 6T/12T 8051-compatible configurations documented for the W78 family |
| ピン数 | 40 pins |
| Supply Form | Tube or tray availability not specified |
W78I054DDG 40-pin dip ピン配置ガイド
W78I054DDG (40-pin dip パッケージ) のピン配置。 このデジタルICには、GPIO、通信インターフェース (UART、SPI、I2C)、および電源ピンが含まれています。代替ピン機能と設定オプションについては、メーカーのデータシートを参照してください。組み込みシステム設計とPCBレイアウトに不可欠です。
詳細なピン配置データはありません: W78I054DDG.
詳細は データシート をご参照ください。
主な用途
W78I054DDG の用途: 6 件s: Industrial User-Interface Controller, Security and Alarm Panel, Barcode-Reader Interface, KVM and Peripheral Controller, Embedded Control and Automation Module, Educational 8051 Development Platform.
Industrial User-Interface Controller
The W78I054DDG fits compact keypad, display, and menu-control systems because its 8-bit 8051-compatible architecture can manage digital I/O and embedded control tasks while operating from 2.4 V to 5.5 V. Its 40 MHz maximum CPU frequency provides useful headroom for scanning inputs, updating displays, and supervising debouncing or status logic. The DIP-40 package is particularly convenient for socketed industrial-control prototypes and legacy controller refreshes. Before finalizing the design, engineers should confirm the exact flash capacity, RAM, timer count, serial-interface configuration, and interrupt assignments in the manufacturer datasheet.
おすすめ
Security and Alarm Panel
The W78I054DDG is appropriate for alarm and security panels that combine sensor inputs, indicator outputs, keypad scanning, and local event handling. Its operating range of 2.4 V to 5.5 V supports common low-voltage control rails, while the 40 MHz class permits responsive polling and firmware-based debounce logic. The Pb-free listing provides useful production-planning information, but installers may still require surge protection and watchdog behavior beyond the MCU itself. Verify the exact memory configuration and peripheral map because the distributor listings disagree on whether the target has 16 KB or 32 KB flash.
おすすめ
Barcode-Reader Interface
The W78I054DDG can serve as the controller in a barcode-reader or scanner interface where the MCU receives serial data, interprets commands, and drives status indicators. Its 8-bit 8051-compatible instruction set aligns with the Nuvoton family applications listed for barcode readers, and the 40 MHz maximum frequency gives adequate control-loop margin for packet handling. The DIP-40 package simplifies socketed industrial peripherals and serviceable assemblies. Engineers must check UART levels, timing, memory size, and interrupt resources against the exact W78I054DDG datasheet before replacing a lower-frequency legacy design.
おすすめ
KVM and Peripheral Controller
The W78I054DDG is well matched to KVM-style switching and peripheral-control boards that monitor buttons, drive indicators, and coordinate external interfaces. Its 2.4 V to 5.5 V supply range allows integration with low-voltage logic systems, and the DIP-40 footprint simplifies compatibility with socketed controller assemblies. Compared with a larger surface-mount MCU, the 40-pin through-hole device can reduce board-routing pressure for moderate I/O counts. Exact suitability depends on available I/O, memory, timing, and peripheral features, which should be confirmed from the manufacturer documentation rather than inferred from the family overview.
おすすめ
Embedded Control and Automation Module
The W78I054DDG can serve as the central controller in a compact automation module that sequences actuators, reads discrete sensors, and reports status. Its 40 MHz maximum operating frequency is appropriate for deterministic embedded logic, while the 2.4 V to 5.5 V range supports common industrial control voltages. The through-hole DIP-40 package is useful during prototyping, education, and maintenance-oriented legacy upgrades. Designers must add appropriate driver circuitry for relays, motors, or high-voltage interfaces and must verify reset, watchdog, memory, and peripheral resources from the exact datasheet.
おすすめ
Educational 8051 Development Platform
The W78I054DDG is a practical choice for educational and prototype platforms built around the 8051 ecosystem because it combines an 8-bit 8051-compatible core, up to 40 MHz operation, and a socket-friendly DIP-40 package. Students can work directly with pushbuttons, LEDs, displays, timers, and serial interfaces without adopting a fine-pitch surface-mount footprint. The 2.4 V to 5.5 V supply range also simplifies many breadboard-level power arrangements. For dependable laboratory results, instructors should standardize on the verified datasheet and explicitly resolve the 16 KB versus 32 KB flash discrepancy between distributor listings.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: W78I054DDG — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | W78E054DDG | W78E052DDG |
|---|---|---|---|
| Package | DIP-40 | DIP-40 | DIP-40 |
| Brand | Nuvoton Technology Corporation | Nuvoton Technology Corporation | Nuvoton Technology Corporation |
| CPU Architecture | 8-bit 8051-compatible | 8-bit 8052-based | 8-bit 8051-compatible W78 series |
| Maximum CPU Frequency | 40 MHz | 40 MHz | 40 MHz |
| Operating Voltage Range | 2.4 V to 5.5 V | 2.4 V to 5.5 V | 2.4 V to 5.5 V |
| Flash Memory | 16 KB or 32 KB across distributor listings; confirm exact target | 16 KB | 8 KB |
| Special Feature | Pb-free | 8052-based W78 microcontroller | 6T/12T 8051-compatible W78 microcontroller |
主な差別化要因
- Closest verified same-package W78-family replacement （vs W78E054DDG)
- Higher memory option among the verified same-brand alternatives （vs W78E052DDG)
- Through-hole serviceability for legacy designs （vs W78E054DDG)
- Verified family voltage and temperature compatibility （vs W78E054DDG)
設計ノート
Design the W78I054DDG supply for the confirmed 2.4 V to 5.5 V operating range and place local ceramic decoupling close to the device's supply and ground pins. Do not infer the exact pin numbers from generic 8051 diagrams because the complete pin table was not present in the verified snippets. Check the manufacturer datasheet for the recommended capacitor values, allowable supply ripple, and whether the selected peripheral configuration requires particular voltage levels. A stable supply is especially important when the DIP-40 socket and long PCB traces introduce additional resistance and inductance.
Resolve the flash-memory conflict before allocating code or data space: the verified LCSC snippet reports 16 KB, while the Mouser snippet describes 32 KB. Compile against the confirmed value and avoid assuming that a software image developed for a 16 KB device will fit if the exact part is the 32 KB variant. Also compare interrupt vectors, peripheral addresses, reset sources, and timer behavior between W78I054DDG and W78E054DDG; matching package dimensions and CPU frequency do not prove that legacy firmware will operate unchanged.
The DIP-40 footprint is well suited to prototypes, socketed assemblies, and serviceable industrial controls. Preserve adequate clearance around adjacent components so the socket and IC can be removed without disturbing nearby capacitors or connectors. Route high-current or switching-node wiring away from the MCU and its supply decoupling. If replacing the through-hole device with a surface-mount equivalent later, verify the manufacturer's land pattern and pin numbering explicitly because a mechanically similar package may not preserve the same electrical pinout.
Use the manufacturer pinout as the controlling document for every net because a complete verified DIP-40 pin table was unavailable. Cross-check oscillator, reset, programming, ground, and supply connections before fabrication. Keep sensitive analog or sensor interfaces away from switching regulators and long high-current paths, even though the MCU itself operates from a relatively low 2.4 V to 5.5 V range. Where a crystal or other timing component is used, follow the datasheet's placement and grounding guidance rather than relying on generic 8051 layouts.
コンプライアンス情報
The verified Mouser listing identifies W78I054DDG as Pb-free, and the verified Nuvoton datasheet result references lead-free RoHS parts information. REACH, halogen-free, and conflict-minerals declarations were not supplied. AEC-Q100 is not applicable because this is an industrial/embedded microcontroller rather than an automotive-qualified device.
