W78E052DFG - 8-Bit 8051 8KB MCU | Nuvoton | Embedded Control
MPN: W78E052DFG ✗ End of LifeW78E052DFG Overview
An 8051 microcontroller is an embedded processing IC that combines a compact 8-bit CPU, program memory, data memory, and peripherals on one device. In the product hierarchy, the W78E052DFG is a microcontroller, which is a type of embedded processor and system-on-chip used in power management, industrial automation, access control, human-interface, and communications equipment. Its traditional 8051 architecture can support established toolchains and software while the W78E052D family adds configurable 6T or 12T operation.
The principal documented features include 8KB of Flash memory, operation from 2.4V through 5.5V, and compatibility with traditional 12T 8051 devices. A Globalspec listing identifies the device as an 8-bit, 40MHz MCU with 8KB of Flash. Manufacturer information describes the W78E052D as configurable for 6T or 12T operation, making it suitable for designs that require a familiar 8051 software model across multiple package and frequency configurations.
The W78E052DFG is specifically identified for a 44-pin QFP package. This surface-mount package supports compact PCB construction without requiring a through-hole socket. The supplied Nuvoton Direct result lists LQFP48, PLCC44, PQFP44, TQFP44, and DIP40 as package options within the broader W78E052D family; the exact package ordering code must therefore be checked against the package drawing when replacing or redesigning a board.
Typical application areas include security and alarm panels, barcode-reader controllers, keyboard-video-mouse or KVM interfaces, key telephones, compact user-interface modules, and industrial control equipment. For these systems, the important selection criteria are the 8KB code-memory capacity, 2.4V to 5.5V supply range, 8-bit processing capability, and availability of the required package and peripheral configuration.
Designers should confirm the full clock, memory, peripheral, and electrical limits in the manufacturer datasheet before release. Because the family description gives broad package and temperature information, the exact ordering code must be used to confirm the device variant. The Mouser listing also specifies a Pb-free finish and a -40°C to 70°C range, while the Nuvoton product information gives a -40°C to 85°C family range, so variant-specific qualification data should control.
This page consolidates the verified manufacturer description, distributor specifications, pricing reference, lifecycle status, and package information for W78E052DFG. It also distinguishes documented facts from unavailable details, providing engineers with a concise basis for initial design review while clearly identifying the datasheet and authorized distributor sources needed for final qualification.
Drop-in alternatives for W78E052DFG — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
No drop-in alternatives available for this product.
Request AlternativesW78E052DFG Maximum Ratings & Electrical Characteristics
| Microcontroller Type | 8-bit 8051-compatible microcontroller |
| CPU Architecture | 8051 |
| Program Memory | 8KB Flash |
| Program Memory Organization | 8K x 8 bits |
| Maximum Listed Clock Frequency | 40MHz |
| Operating Voltage Range | 2.4V to 5.5V |
| Architecture Configuration | Configurable 6T/12T 8051 |
| Package | 44-pin QFP |
| Surface-Mount Package | QFP-44 |
| Distributor Temperature Range | -40°C to 70°C |
| Manufacturer Family Temperature Range | -40°C to 85°C |
| Lead-Free Status | Pb-free |
| Target Applications | Security/Alarm, Bar Code Reader, KVM, Key Phone, UI, IPC |
W78E052DFG qfp-44 Pin Configuration Guide
Pin configuration for W78E052DFG (qfp-44 package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for W78E052DFG.
Refer to the datasheet for full pin configuration.
Typical Applications
W78E052DFG is suitable for 6 applications: Security and Alarm Control, Barcode Reader Interface, KVM and User-Interface Control, Industrial Control Module, Key Telephone Control, Embedded IPC and Peripheral Control.
Security and Alarm Control
The W78E052DFG fits an alarm-panel controller because it combines an 8-bit 8051-compatible processor with 8KB of Flash program memory in a compact 44-pin QFP package. Its documented 2.4V to 5.5V operating range permits integration with conventional low-voltage digital control logic. The MCU can coordinate sensors, status indicators, user inputs, and an alarm interface. Before layout approval, engineers should verify the required timer, interrupt, I/O, watchdog, and programming features against the exact W78E052DFG datasheet, particularly because the family is NRND.
Barcode Reader Interface
A barcode-reader controller can use the W78E052DFG for decoding management, device handshaking, and result forwarding. The controller requires only 8KB of Flash according to the verified distributor specification, while the listed 40MHz capability provides useful headroom for serial data handling and protocol processing. The 44-pin QFP construction also supports compact, surface-mount assembly. Firmware must be reviewed for code-space margin, interrupt latency, UART requirements, and peripheral availability, since those detailed parameters are not present in the supplied search excerpts.
KVM and User-Interface Control
The W78E052DFG is suitable for KVM switches, key telephones, and compact user-interface controllers because it integrates an 8-bit 8051-compatible core, 8KB of Flash, and operation from 2.4V to 5.5V in one 44-pin QFP device. Such systems generally require deterministic control of keys, indicators, communication ports, and external interface logic. The established 8051 architecture may simplify migration from legacy code, although engineers must confirm pin multiplexing, timing, programming, and peripheral compatibility before treating it as a modern platform.
Industrial Control Module
For a small industrial-control module, the W78E052DFG provides an established 8-bit control platform with 8KB of Flash, configurable 6T/12T operation, and a 2.4V to 5.5V supply range. It can execute sequencing logic, monitor discrete inputs, and coordinate actuator outputs when the required timer and I/O resources are available. The listed 40MHz frequency can improve responsiveness over slower legacy implementations, but system qualification should include a complete electrical review, firmware resource budget, and an NRND availability plan.
Key Telephone Control
The W78E052DFG can support the embedded control function of a key telephone or similar keypad-based terminal because the 8051-compatible architecture is suited to established embedded-control code and the 8KB Flash capacity covers compact keypad, display, and communication-handling logic. Its 44-pin QFP package allows automated surface-mount production, while the 2.4V to 5.5V operating range supports low-voltage integration. Designers must verify the required UART, timer, I/O, display, and interrupt resources for the exact ordering code before schematic release.
Embedded IPC and Peripheral Control
The W78E052DFG can act as a peripheral controller in an embedded IPC or industrial controller that retains legacy 8051 software. Nuvoton identifies configurable 6T/12T operation and compatibility with traditional 12T 8051 devices, making the MCU relevant to cost-conscious embedded-control tasks. The documented 8KB Flash capacity and 2.4V to 5.5V supply make it practical for compact secondary controllers, but required peripherals, oscillator configuration, programming method, and thermal performance must be confirmed from the manufacturer datasheet.
Engineering reference data for W78E052DFG — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product |
|---|---|
| Brand | Nuvoton Technology Corporation |
| Package | 44-pin QFP |
| Microcontroller Type | 8-bit 8051-compatible microcontroller |
| Program Memory | 8KB Flash |
| Program Memory Organization | 8K x 8 bits |
| Maximum Listed Clock Frequency | 40MHz |
| Operating Voltage Range | 2.4V to 5.5V |
| Architecture | Configurable 6T/12T 8051 |
| Lifecycle Status | NRND |
| Verified Starting Price | $1.0410 as of 2026-10-28 |
Key Differentiators
- Established 8051-compatible embedded-control architecture (vs General-purpose 8-bit MCUs)
- Compact memory configuration in a 44-pin QFP (vs Larger-package general-purpose MCUs)
- Wide low-voltage operating range (vs Fixed 5V legacy 8051 devices)
Design Notes
Do not substitute the W78E052DFG solely because another member of the W78E05xD family has a similar ordering code. The verified manufacturer result confirms several package options in the W78E052D family, while the target is specifically identified as a 44-pin QFP. Confirm the exact footprint, exposed pad requirements where applicable, programming pins, oscillator connections, reset behavior, and every peripheral signal against the W78E052DFG package drawing before authorizing a replacement.
Design the 2.4V to 5.5V supply path so the W78E052DFG remains within the limits defined for the exact variant. Place the required input, output, and decoupling capacitors at the pins specified by the manufacturer and keep high-current return paths away from sensitive oscillator and programming traces. The supplied excerpts do not include capacitor values or layout constraints, so those values must be taken directly from the manufacturer datasheet rather than inferred from generic 8051 designs.
Treat the NRND status as a sourcing and lifecycle constraint, not merely an informational label. The W78E052D family is marked not recommended for new designs, and the verified stock indication does not guarantee multi-year production availability. For an existing product, obtain a written supply commitment and secure adequate safety stock. For a new design, compare the W78E052DFG with currently recommended Nuvoton devices before committing the PCB, tooling, and long-term maintenance plan.
Compliance Information
The supplied Mouser listing identifies W78E052DFG as Pb-free. No verified RoHS, REACH, AEC-Q100, halogen-free, or conflict-minerals declaration was included in the supplied data.
