W78I052DFG - 8KB 40MHz 8051 MCU | Nuvoton | BQFP-44
料号： W78I052DFG ✓ 量产中W78I052DFG 概述
An 8051 microcontroller is an 8-bit embedded-processing component within the broader microcontroller and semiconductor hierarchy. It integrates program memory, data memory, digital I/O, timers, serial communication functions, and interrupt control into one package. Compared with larger 32-bit microcontrollers, the W78I052DFG focuses on deterministic control of digital systems with modest flash requirements, lower implementation complexity, and a broad base of compatible development tools and peripherals.
The verified key characteristics are 8KB Flash, 40MHz operation, 2.4V-to-5.5V supply voltage, 256 bytes of RAM, and a 44-pin BQFP package. These values position the device for embedded products that require more general-purpose firmware storage than a very small 8-bit controller while retaining the cost and simplicity associated with the 8051 architecture. The 40MHz clock rating provides additional execution headroom for protocol handling and multi-task control.
Within the Nuvoton W78 8-bit product family, the W78E052D is a closely related 8051 MCU described as configurable and pin-compatible with traditional 12T 8051 devices. Its documented operating range is also 2.4V to 5.5V at -40°C to 85°C. Available family packages include PQFP-44 and other form factors, so the DFG package suffix and footprint must be checked carefully before treating a related W78E052D ordering code as a board-level replacement.
Typical application directions include security and alarm controllers, barcode-reader interfaces, keyboard and telephone user-interface modules, KVM equipment, and compact industrial-control panels. These systems benefit from the MCU's 8KB Flash, 256-byte RAM, multiple I/O pins, and ability to operate across a voltage range compatible with 5V-oriented embedded logic.
PCB design should preserve the exact PQFP-44/BQFP-44 footprint, pin assignment, oscillator requirements, reset behavior, and decoupling requirements from the applicable Nuvoton datasheet. Because the supplied search data does not expose the complete pin table or confirmed replacement matrix, engineers should verify pin-level continuity and peripheral multiplexing before production substitution.
This page consolidates the verified distributor specifications, package information, pricing evidence, related-family references, and practical engineering caveats. It also distinguishes confirmed drop-in candidates from family-level options that still require schematic, footprint, clock, and peripheral compatibility checks.
直接替换替代料： W78I052DFG ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： W78I052DFG （相同外形与封装尺寸） ——差异在于 Architecture, Maximum Clock Frequency, Microcontroller Type, Mounting Type, Operating Voltage Range.
W78E052DFG
✅ 直接替换联系询价
查看数据手册 →W78E052DDG
✅ 直接替换 ⚠️ 规格未核验联系询价
查看数据手册 →W78I052D
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
W78E051D
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
W78E052A
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
W78I052DFG 最大额定值与电气特性
| Microcontroller Type | 8-bit 8051-family microcontroller |
| Architecture | 51 Series |
| Flash Memory | 8KB |
| RAM | 256 Byte |
| 最大时钟频率 | 40MHz |
| Operating Voltage Range | 2.4V to 5.5V |
| 工作温度范围 | -40°C to 85°C |
| 封装 | 44-pin BQFP |
| Package Family | PQFP-44 (10x10 mm) |
| 安装类型 | Surface Mount |
| Lead-Free Status | Pb-free |
| RoHS 状态 | Compliant |
| Program Memory Type | FLASH |
W78I052DFG pqfp-44 (10x10 mm) 引脚配置指南
W78I052DFG（pqfp-44 (10x10 mm) 封装）的引脚配置。 该数字 IC 包含 GPIO、通信接口（UART、SPI、I2C）和电源引脚。请参阅制造商数据手册以了解复用引脚功能和配置选项。对嵌入式系统设计和 PCB 布局至关重要。
暂无详细引脚数据： W78I052DFG.
请参阅 数据手册 以查看完整引脚配置。
典型应用
W78I052DFG 适用于 6 应用s: Security and Alarm Controllers, Barcode Reader Interfaces, KVM Control Modules, Key Telephone User Interfaces, Compact Industrial Control Panels, Human-Interface Embedded Products.
Security and Alarm Controllers
The W78I052DFG fits compact security and alarm-control modules because its 8KB Flash provides room for control firmware, while its 256-byte RAM and 40MHz clock support responsive state-machine handling. The 2.4V-to-5.5V operating range permits integration with common low-voltage and 5V peripheral arrangements. In a practical alarm panel, the MCU can supervise sensors, drive indicators, and coordinate keypad events. The 44-pin BQFP package also offers more connection options than a small-package 8051. Before layout approval, engineers should verify the exact I/O assignments, interrupt sources, oscillator arrangement, and reset behavior from the Nuvoton datasheet, since those details were not included in the supplied distributor excerpts.
推荐
Barcode Reader Interfaces
W78I052DFG is suitable for a barcode-reader interface because barcode scanners commonly require deterministic digital control, serial communication, and compact firmware rather than a high-performance application processor. The MCU's 40MHz maximum clock provides execution margin for decoding support, status handling, and communication routines, while 8KB Flash stores the device's control program. It can be placed between a scan engine and a host interface, translating trigger, data-ready, and error signals. The exact UART or other serial-resource configuration must be confirmed from the datasheet. Engineers should also account for the 256-byte RAM limit, external I/O levels, and the need for local bypass capacitors around the 2.4V-to-5.5V supply rail.
推荐
KVM Control Modules
The W78I052DFG can serve as the controller in a compact KVM module that coordinates keyboard, video, or peripheral selection signals. Its 8KB Flash is appropriate for self-contained firmware handling switch states, LEDs, button inputs, and a communication protocol, and the 40MHz clock supports deterministic multitasking. The 44-pin BQFP package provides a practical number of external connections for control outputs and status indicators. A production design should verify whether all required UART, timer, and interrupt resources are simultaneously available. Signal conditioning may also be needed for the selected interface, while the 2.4V-to-5.5V range and -40°C-to-85°C rating support mainstream industrial operating environments without requiring an extended-temperature variant.
推荐
Key Telephone User Interfaces
W78I052DFG is appropriate for key-phone and telephone user-interface modules that must scan keys, update displays, control indicators, and respond to call or hook events. The microcontroller's 8KB Flash can retain keypad mapping, state-machine code, and sound-control routines, while 40MHz operation provides useful timing headroom for debouncing and display updates. Its 44-pin BQFP package allows a practical number of I/O connections for keys and indicators. Designers should confirm the available timer channels, serial functions, and interrupt mapping against the actual firmware requirements. The 256-byte RAM may require careful buffer management, and the board must maintain clean power and clock signals across the full 2.4V-to-5.5V supply range.
推荐
Compact Industrial Control Panels
The W78I052DFG is suitable for compact industrial control panels that monitor discrete inputs and operate relays, lamps, or other digital actuators. Its 8KB Flash supports a focused control program, and the 40MHz clock allows responsive debouncing and state updates. The -40°C-to-85°C rating covers many industrial environments, while the 2.4V-to-5.5V operating range supports common embedded supply levels. The 44-pin BQFP package provides a larger I/O and power-pin budget than the smallest controller packages. Designers should use the manufacturer pin map to allocate I/O, avoid loading outputs beyond their specified drive limits, and isolate inductive or high-current actuator paths from the MCU. Exact I/O counts and timing characteristics are not present in the supplied excerpts and must be verified before schematic release.
推荐
Human-Interface Embedded Products
W78I052DFG can support human-interface products such as keypad controllers, menu panels, and compact equipment-control modules. Its 8KB Flash is sufficient for many focused firmware workloads, and its 40MHz maximum clock helps maintain responsive interaction without a more complex processor. The 44-pin BQFP package accommodates keypad scanning, display-control outputs, indicators, and serial communication. Because the device has 256 bytes of RAM, the firmware should use buffers carefully and avoid unnecessary simultaneous display copies. Hardware design should account for switch-bounce timing, connector protection, and logic-level compatibility with the attached display or keypad. The confirmed -40°C-to-85°C range and 2.4V-to-5.5V supply specification support many commercial and industrial implementations, subject to the missing pin and peripheral details being checked in the datasheet.
推荐
推荐产品汇总
工程参考数据： W78I052DFG ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | W78E052DFG | W78E052D | W78I052D | W78E051D | W78E052A |
|---|---|---|---|---|---|---|
| Package | PQFP-44 (10x10 mm) | PQFP-44 (10x10 mm) | PQFP-44 (10x10 mm) | PQFP-44 (10x10 mm) | PQFP-44 (10x10 mm) | PQFP-44 (10x10 mm) |
| Brand | Nuvoton | Nuvoton | Nuvoton | Nuvoton | Nuvoton | Nuvoton |
| Processor Architecture | 8-bit 8051-family | Configurable 6T/12T 8051 | Configurable 6T/12T 8051 | 8051-family | W78E 8051-family | W78E052 8051-family |
| Operating Voltage Range | 2.4V to 5.5V | 2.4V to 5.5V | 2.4V to 5.5V | 2.4V to 5.5V | 2.4V to 5.5V | 2.4V to 5.5V |
| Operating Temperature Range | -40°C to 85°C | -40°C to 85°C | -40°C to 85°C | -40°C to 85°C | -40°C to 85°C | -40°C to 85°C |
| Special Configuration | W78I052 family | Configurable 6T/12T 8051 | Configurable 6T/12T 8051 | W78I052 family | W78E051 family | W78E052A family |
关键差异点
- Directly verified 8KB Flash configuration （对比 W78E051D)
- Explicit 40MHz maximum operating frequency （对比 W78E052A)
- Documented 44-pin BQFP package （对比 W78E052D)
- Same 2.4V-to-5.5V and -40°C-to-85°C operating envelope （对比 W78E052DFG)
设计说明
Treat W78I052DFG as a PQFP-44/BQFP-44 surface-mount device with a 10x10 mm body. Place the decoupling capacitor or capacitors directly between the device supply and ground pins, keep the loop short, and route high-current return paths away from clock and sensitive control inputs. Because the canonical SVG library provided for this task has no PQFP-44 or LQFP-44 key, the package diagram uses the default key; engineers must use the Nuvoton mechanical drawing and exact DFG land pattern rather than a generic QFP template.
Do not assume that every W78-family 44-pin device is a drop-in replacement merely because its package outline matches. W78E052DFG and W78E052D are described as configurable 6T/12T 8051 devices, while W78I052DFG is the specified W78I052 device. Before substitution, compare every power and ground pin, oscillator pins, reset input, interrupt-capable pins, serial functions, timer channels, I/O direction, pull states, and any programming or test pins. Also recompile and test the firmware because instruction timing and register organization can differ across 6T and 12T configurations.
Route the oscillator and reset networks away from switching nodes and noisy peripheral outputs, and provide local return paths for every supply connection in the 44-pin footprint. If the MCU drives relays, lamps, display lines, or long cables, separate those outputs from sensitive timing and communication nets. Verify external logic levels because the device supports a 2.4V-to-5.5V operating range, but the exact I/O thresholds, output-drive ratings, and maximum transition rates were not included in the supplied verified excerpts and must be obtained from the manufacturer datasheet.
Design the supply for the full 2.4V-to-5.5V operating range, including voltage tolerance, startup ramp, and transient behavior. Place bulk capacitance near the source or power-entry point and local high-frequency bypass at the MCU pins. Do not use the catalog listing as evidence of a safe continuous-current or power-dissipation rating. Check the datasheet for internal-block current, I/O loading, and operating conditions at 40MHz because those values were not present in the supplied search data.
合规信息
The verified LCSC listing marks W78I052DFG RoHS compliant, while the Mouser listing identifies it as Pb-free. No explicit REACH, halogen-free, conflict-minerals, or automotive-qualification statement was provided. AEC-Q100 is not applicable based on the absence of an automotive qualification claim.
