W78L365A24FL - 24MHz 8-Bit 64KB MCU | Nuvoton | 44-LQFP
部品番号: W78L365A24FL ✓ 生産中W78L365A24FL 概要
An 8-bit microcontroller is a programmable control IC that executes firmware from embedded program memory and reads inputs from sensors, switches, communication interfaces, and human-interface circuits. The W78L365A24FL belongs to the W78 family and uses a standard 8052-compatible instruction set, placing it within the hierarchy of 8-bit MCU, embedded controller, integrated circuit, and semiconductor.
Key features include 64 KB of in-system programmable flash for firmware storage, a 4 KB boot block for application loading, 1,024 bytes of general-purpose RAM plus 256 bytes of additional RAM, 36 I/O pins, and a maximum clock frequency of 24 MHz. The 2.4 V to 4.5 V operating range supports low-voltage embedded systems, while the Pb-free package designation identifies lead-free assembly.
The W78L365A family architecture separates the main 64 KB program area from the auxiliary 4 KB boot area. A loader program can use the boot block to update the main program memory, making the device suitable for products requiring field firmware upgrades. Its 8052-compatible instruction set supports established 8051/8052 development methods, while the additional RAM and I/O capacity provide more working space than basic entry-level 8051 devices.
Typical applications include industrial control panels, appliance controllers, building equipment, data-collection terminals, communication modules, and compact embedded products. The combination of 36 I/O pins, a 24 MHz clock, and bootloader-supported flash is useful when a controller must combine multiple digital interfaces with in-system firmware maintenance.
When designing around the W78L365A24FL, confirm that the 44-BQFP land pattern and exposed programming interface match the PCB design. Follow the manufacturer datasheet for oscillator, reset, memory programming, decoupling, and pin-assignment requirements; the 2.4 V minimum operating voltage must also be respected throughout power-up and brownout conditions.
This product page combines core device specifications, verified package information, bootloader considerations, practical application guidance, and same-family replacement analysis. It is designed to help engineers evaluate firmware compatibility, PCB footprint reuse, operating-voltage constraints, and upgrade requirements before selecting the W78L365A24FL for an embedded design.
ドロップイン代替品: W78L365A24FL — 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。
W78L365A20FL
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
W78L365A16FL
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
W78L365A24FL 最大定格＆電気的特性
| Product Type | 8-bit 8052-compatible flash microcontroller |
| 最大クロック周波数 | 24 MHz |
| Program Memory Size | 64 KB (64K x 8) |
| Boot Block Size | 4 KB |
| Program Memory Type | In-system programmable Flash EPROM |
| RAM Size | 1.25 KB (1K x 8 plus 256 bytes) |
| Number of I/O Pins | 36 pins |
| Operating Voltage Range | 2.4 V to 4.5 V |
| Core Processor | 8052 |
| Core Architecture | 8-bit |
| パッケージ | 44-pin BQFP |
| 実装タイプ | Surface mount |
| Lead-Free Status | Pb-free |
| Instruction Set Compatibility | Standard 8052-compatible |
W78L365A24FL 44-pin bqfp ピン配置ガイド
W78L365A24FL (44-pin bqfp 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: W78L365A24FL.
詳細は データシート をご参照ください。
主な用途
W78L365A24FL の用途: 6 件s: Appliance Control Panels, Building Equipment Controllers, Data Collection Terminals, Communication Modules, Programmable Logic Controllers, Smart Home Interface Modules.
Appliance Control Panels
The W78L365A24FL fits appliance control panels that require many discrete inputs and outputs, moderate firmware storage, and field firmware maintenance. Its 36 I/O pins can support keys, indicators, relays, sensor inputs, and communication signals, while the 24 MHz clock gives an 8052-compatible control loop additional timing headroom. The separate 4 KB boot block allows a loader to update the 64 KB main flash during production or service. In a 2.4 V to 4.5 V embedded design, the MCU can coordinate front-panel behavior while the boot area preserves an approved recovery path.
Building Equipment Controllers
Building equipment controllers often combine multiple digital inputs with status indicators, relay outputs, and local service interfaces. The W78L365A24FL provides 36 I/O pins, 64 KB of flash, and 1.25 KB of RAM for coordinating such functions in a compact 44-pin BQFP package. Its 8052-compatible instruction set supports established embedded control patterns, while the bootloader architecture can facilitate firmware revisions without replacing the controller. Confirm the environmental temperature and qualification requirements for the installation site before selecting this device for exposed or safety-related equipment.
Data Collection Terminals
A compact data-collection terminal can use the W78L365A24FL to sample digital sensors, manage local status, and stage information for a serial communications link. Its 64 KB program area accommodates application firmware and protocol handling, while 1,024 bytes of RAM plus a 256-byte RAM area support short working buffers. The 24 MHz operating speed provides additional margin for interrupt-driven I/O and communication routines. The bootloader-supported flash architecture is also useful when deployed devices need configuration or firmware updates during maintenance.
Communication Modules
The W78L365A24FL can serve as the embedded controller in a low-voltage communication module that manages a transceiver, configuration pins, indicators, and a host interface. Its 36 I/O pins provide ample parallel connectivity, and the 8052-compatible 24 MHz core is suitable for interrupt-driven serial handling and protocol framing. The 64 KB main flash and 4 KB boot area allow firmware and a controlled update path to coexist. Validate protocol timing and peripheral interface voltage levels against the manufacturer datasheet.
Programmable Logic Controllers
Small programmable logic controllers can use the W78L365A24FL to execute digital logic, monitor discrete sensors, and control relays or other field devices. The 36 available I/O pins suit compact terminal blocks and limited-channel machines, while the 24 MHz clock supports more responsive task scheduling than a slower 8-bit variant. Its 8052-compatible instruction set makes it practical to adapt existing control code, and the in-system-programmable flash supports production programming and field revisions. Use the manufacturer documentation for watchdog, reset, and peripheral operation.
Smart Home Interface Modules
The W78L365A24FL is applicable to compact smart-home interface modules that translate switches, sensors, relays, and status LEDs into a connected control system. Its 36 I/O pins and 1.25 KB RAM support several concurrent digital functions, while the 64 KB flash provides room for protocol and application logic. The 24 MHz clock helps service multiple interrupt-driven tasks, and the 4 KB boot block can support controlled firmware maintenance. Confirm radio-module supply requirements, standby behavior, and the exact peripheral functions before finalizing the board design.
エンジニアリング参考データ: W78L365A24FL — 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 | W78L365A20FL | W78L365A16FL |
|---|---|---|---|
| Package | 44-pin BQFP | 44-pin BQFP | 44-pin BQFP |
| Brand | Nuvoton Technology Corporation | Nuvoton Technology Corporation | Nuvoton Technology Corporation |
| Maximum Clock Frequency | 24 MHz | 20 MHz | 16 MHz |
| Core Architecture | 8-bit 8052-compatible | 8-bit 8052-compatible | 8-bit 8052-compatible |
| Program Memory Size | 64 KB | 64 KB | 64 KB |
| Boot Block Size | 4 KB | 4 KB | 4 KB |
| RAM Size | 1.25 KB | 1.25 KB | 1.25 KB |
| Number of I/O Pins | 36 | 36 | 36 |
| Operating Voltage Range | 2.4 V to 4.5 V | 2.4 V to 4.5 V | 2.4 V to 4.5 V |
主な差別化要因
- Higher clock speed within the same pin-compatible family （vs W78L365A20FL)
- Additional timing margin over the lower-speed W78 variant （vs W78L365A16FL)
- Full-speed option preserves maximum family performance （vs W78L365A20FL)
設計ノート
Confirm every signal against the pin-description table in the W78L(E)365(A) manufacturer datasheet before releasing the PCB. The 44-pin BQFP footprint is not represented by a dedicated package diagram in the package library, so do not infer pad numbering from a visually similar 44-pin component. Preserve the manufacturer-recommended land pattern, pin-1 orientation, exposed programming interface, and separate analog or timing-sensitive connections where applicable.
Design the supply for the full 2.4 V to 4.5 V operating range, including startup and brownout behavior. Place the decoupling network close to the supply and ground pins using the values and topology specified in the manufacturer datasheet. Because the MCU shares its supply domain with sensors, relays, or communications devices, calculate their worst-case current together rather than designing the regulator only for the nominal MCU load.
Do not treat the W78L365A20FL as an exact functional equivalent to the W78L365A24FL. Its 20 MHz maximum clock is 4 MHz lower, so review baud-rate timing, interrupt latency, control-loop deadlines, and any assembly code that assumes a 24 MHz clock. The shared package and core architecture simplify hardware reuse, but timing validation remains necessary before production substitution.
Protect the bootloader workflow by keeping the programming interface accessible and following the manufacturer requirements for firmware update entry and verification. Avoid placing noisy switching nodes or long high-impedance traces near oscillator and reset circuitry. Validate signal levels and isolation between the programming connector, external peripherals, and powered-down states of the W78L365A24FL before field updates are authorized.
コンプライアンス情報
Distributor product information identifies W78L365A24FL as Pb-free. RoHS, REACH, halogen-free, and conflict-minerals declarations are not established for this exact ordering code.
