W78E051DPG - 8-Bit 40MHz 4KB Flash MCU | Nuvoton
料号： W78E051DPG ✓ 量产中W78E051DPG 概述
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.
直接替换替代料： W78E051DPG ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
该产品暂无直接替换替代料。
请求替代料W78E051DPG 最大额定值与电气特性
| Product Type | 8-bit microcontroller |
| Processor Core | 8052-compatible |
| 最大时钟频率 | 40 MHz |
| Flash Program Memory | 4 KB (4K x 8 bits) |
| RAM | 256 bytes |
| Programmable I/O Pins | 36 pins |
| 工作电源电压 | 2.4 V to 5.5 V |
| 工作温度 | -40 °C to 70 °C |
| 封装 | 44-LCC J-lead |
| Power-On Reset | Integrated |
| Watchdog Timer | Integrated |
| Lead-Free Status | Pb-free |
W78E051DPG 44-lcc j-lead 引脚配置指南
W78E051DPG（44-lcc j-lead 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： W78E051DPG.
请参阅 数据手册 以查看完整引脚配置。
典型应用
W78E051DPG 适用于 6 应用s: Industrial Control Module, Appliance Controller, Building Equipment Controller, Compact Sensor Interface, LED Status and Sequencer, Peripheral Sequencer.
Industrial Control Module
The W78E051DPG fits compact industrial control modules that supervise relays, indicators, pushbuttons, and discrete sensors. Its 36 programmable I/O pins reduce the need for separate I/O expanders, while the 40 MHz 8052-compatible core supports responsive state-machine control. The 2.4 V to 5.5 V supply range is suitable for common low-voltage control rails, and the integrated watchdog timer can help recover the controller after a firmware or transient fault. Designers should reserve memory for stack depth and diagnostics because only 4 KB of Flash and 256 bytes of RAM are available.
推荐
Appliance Controller
The W78E051DPG is appropriate for appliance controllers that coordinate buttons, status LEDs, small motors, and safety-related discrete signals. Its integrated 8052-compatible core provides deterministic control in a compact 44-LCC J-lead package, while 36 programmable pins offer enough interface capacity for a mid-range control board. Firmware can implement debouncing, operating-state management, and fault timers without an external microcontroller. The design must remain within the 4 KB Flash and 256-byte RAM limits and should use the watchdog timer and manufacturer-defined reset behavior for dependable recovery.
推荐
Building Equipment Controller
The W78E051DPG can support building-equipment subcontrollers that monitor switches and operate relays, indicators, or low-power actuators. Its 36 programmable I/O pins suit distributed discrete control, and the verified -40 °C to 70 °C range covers many indoor industrial environments. The 2.4 V to 5.5 V operating range allows use of common control-supply levels, although long wiring runs may require protection and filtering. Firmware should include debounce, timeout, and fault-state logic because the MCU's small 4 KB Flash footprint limits complex supervisory algorithms.
推荐
Compact Sensor Interface
The W78E051DPG is suitable for a compact sensor-interface node that reads discrete inputs, applies thresholds, and reports states through simple control signals. Its 40 MHz clock allows responsive digital filtering, and 36 programmable pins provide connections for sensors, logic-level indicators, and an interface controller. The 256 bytes of RAM is adequate for small state and sample buffers but not for large histories, while 4 KB Flash favors concise firmware. Any analog front end should be separated from sensitive control traces and grounded carefully under the board's return-current plan.
推荐
LED Status and Sequencer
The W78E051DPG can implement compact LED sequencing, panel indication, and diagnostic-status logic where many outputs are more important than complex computation. Its 36 programmable I/O pins provide ample discrete output channels, and the 8052-compatible instruction set is straightforward for timing and state-machine code. The 40 MHz clock supports reliable updates even when several indicators are multiplexed. Because the device is not a dedicated LED driver, current limits, series resistance, flicker behavior, and thermal performance of the chosen LED arrangement must be handled by the board design.
推荐
Peripheral Sequencer
The W78E051DPG is appropriate for sequencing peripheral mechanisms, test fixtures, or small actuator chains where deterministic timing and interlocks matter. Its 40 MHz core can execute state tables rapidly, while 36 programmable I/O pins provide outputs for stepper controls, solenoids, lamps, and status feedback. The integrated watchdog timer adds recovery value, but safe actuator design must also include hardware interlocks and appropriate driver circuits. The limited 256-byte RAM and 4 KB Flash make concise tables and layered state logic preferable to large buffered workflows.
推荐
推荐产品汇总
工程参考数据： W78E051DPG ——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 |
|---|---|
| Package | 44-LCC J-lead |
| Brand | Nuvoton Technology Corporation |
| Processor Core | 8052-compatible |
| Maximum Clock Frequency | 40 MHz |
| Flash Program Memory | 4 KB (4K x 8 bits) |
| RAM | 256 bytes |
| Programmable I/O Pins | 36 pins |
| Operating Supply Voltage | 2.4 V to 5.5 V |
| Operating Temperature | -40 °C to 70 °C |
| Lead-Free Status | Pb-free |
关键差异点
- High clock speed for a compact 8-bit controller （对比 ATMEGA328P-MNR)
- Substantial discrete I/O availability （对比 ATTINY20-XUR)
- Integrated system-support functions （对比 ATMEGA328P-MNR)
设计说明
Place the W78E051DPG away from high-current switching nodes and long copper paths that carry motor or relay currents. Keep the 44-LCC J-lead footprint mechanically compatible with the manufacturer's land pattern and verify pin numbering directly against the datasheet. Because the supplied snippets do not provide the complete pin map, do not release the schematic or PCB from distributor summaries alone.
Design the 2.4 V to 5.5 V supply for the MCU and every connected peripheral, including logic-level compatibility at the rails. Follow the manufacturer guidance for decoupling capacitance, power-on reset behavior, and maximum supply ramp rates. The verified snippets identify the voltage range but do not specify the required capacitor values or startup timing, so those values must be taken from the datasheet.
Do not assume that any 8-bit MCU is firmware- or pin-compatible with this device. The W78E051DPG has only 4 KB of Flash and 256 bytes of RAM, so verify code size, stack depth, interrupt nesting, and buffer requirements before committing a complex control algorithm. Also confirm peripheral registers and interrupt-vector organization when migrating existing 8051-family firmware.
Use the integrated watchdog timer and power-on reset as part of the fault-recovery strategy, but do not treat them as substitutes for input validation or actuator interlocks. External switches and relays can introduce bounce, transients, and long wiring noise. Apply suitable filtering and protection consistent with the intended industrial environment, and validate behavior across the full -40 °C to 70 °C operating range.
合规信息
The verified Mouser listing identifies W78E051DPG as Pb-free. The supplied data does not explicitly state RoHS, REACH, AEC-Q100, halogen-free, or conflict-minerals status.
