W78I052DPG - 8-Bit 40MHz 8KB Flash MCU | Nuvoton
MPN: W78I052DPG ✓ ActiveW78I052DPG Overview
An 8052-compatible microcontroller is an embedded processing component built around the 8051 instruction-set architecture. Within the product hierarchy, this device belongs to the microcontroller category and, more specifically, to the 8-bit MCU family. It executes embedded control firmware rather than providing only analog or digital signal-conditioning functions. Its PLCC-44 package exposes the device's peripheral, interrupt, reset, clock, and I/O connections through 44 leads for board-level integration.
The verified W78I052DPG specifications identify an 8 KB Flash organization, a maximum clock rate of 40 MHz, a 2.4 V to 5.5 V supply range, and an industrial temperature span of -40 °C to +85 °C. The 8 KB Flash capacity allows an embedded product to retain its application program and configuration data without an external program-memory device. The 40 MHz clock rating supports time-sensitive tasks where an 8-bit architecture is sufficient, although available memory and peripheral details must be confirmed against the manufacturer documentation before final design release.
W78I052DPG is associated with the Nuvoton W78 family and the 8052 microcontroller class. At 8 KB of program storage, it is intended for compact control logic rather than connectivity-heavy gateways, high-resolution graphical systems, or applications requiring extensive code libraries. Firmware developers should account for interrupt latency, stack depth, code size, and peripheral configuration when estimating whether 8 KB is sufficient. Clock-dependent timing must be calculated against the actual operating frequency rather than assuming the maximum 40 MHz rating applies throughout the operating range.
Typical uses include industrial control modules, appliance controllers, building equipment, sensor-conditioning interfaces, and compact embedded automation products. In these systems, the MCU can coordinate inputs, update actuators, execute control routines, and supervise power or communication functions. Its -40 °C to +85 °C rating supports equipment intended for industrial environmental conditions, while the 2.4 V to 5.5 V range permits integration with common embedded supply systems. Exact timer, serial-interface, and I/O capabilities require confirmation from the manufacturer datasheet.
The principal design consideration is to validate the complete pinout, clock limits, peripheral mix, and memory map against the official datasheet before laying out a replacement PCB. A PLCC-44 footprint cannot be assumed to be interchangeable with a QFP-44 footprint because lead pitch, pad geometry, and pin numbering can differ. Decoupling, reset circuitry, clock stability, programming access, and exposed-ground requirements should likewise follow the manufacturer's recommended layout rather than generic 8051 conventions.
This product record combines the exact distributor-listed 8 KB Flash, 40 MHz, voltage, temperature, and package details with sourced availability information, transparent missing-data markers, and package-focused alternative analysis. It is intended to support engineering selection and sourcing without presenting unverified peripheral specifications, fabricated pin assignments, or unsupported drop-in claims.
Drop-in alternatives for W78I052DPG — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
W78E052DPG
✅ Drop-InContact for price
View Datasheet →DS89C420-QNL
✅ Drop-In📋 Reference alternative (not in catalog)
SC87C51CGA44
✅ Drop-In📋 Reference alternative (not in catalog)
W78I052DPG Maximum Ratings & Electrical Characteristics
| Microcontroller Type | 8-bit W78 8052-compatible microcontroller |
| Maximum Operating Frequency | 40 MHz |
| Flash Memory Size | 8 KB (8K x 8 bits) |
| Operating Voltage Range | 2.4 V to 5.5 V |
| Operating Temperature Range | -40 °C to +85 °C |
| Package | 44-pin PLCC |
| Mounting Type | Surface mount |
| Lead-Free Status | Pb-free |
| Program Memory Type | Flash |
| CPU Instruction Set | 8052-compatible 8-bit instruction set |
W78I052DPG 44-pin plcc Pin Configuration Guide
Pin configuration for W78I052DPG (44-pin plcc 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 W78I052DPG.
Refer to the datasheet for full pin configuration.
Typical Applications
W78I052DPG is suitable for 6 applications: Industrial Equipment Controller, Appliance Control Module, Building Equipment Interface, Sensor Conditioning and Data Acquisition, Compact Automation Controller, Communication Gateway Interface.
Industrial Equipment Controller
The W78I052DPG fits compact industrial-control modules that coordinate sensors, relays, indicators, and actuator logic. Its verified 8-bit 8052-compatible architecture, 40 MHz maximum clock, and -40 °C to +85 °C temperature rating suit real-time supervisory functions where a higher-complexity processor would be unnecessary. The 8 KB Flash provides space for a focused control program, while the 2.4 V to 5.5 V supply range integrates with common embedded rails. Designers should reserve firmware space for fault handling, debounce logic, and safe output states. Pin assignments and peripheral availability must be confirmed from the manufacturer datasheet before assigning critical I/O.
Recommended
Appliance Control Module
The W78I052DPG is appropriate for appliance controllers that sequence motors, heaters, valves, displays, and user inputs under a compact embedded program. A 40 MHz clock provides timing headroom for event handling, while 8 KB of Flash can hold a focused state machine and safety routines without an external memory device. Its Pb-free designation is useful for modern production sourcing, and the -40 °C to +85 °C range covers many environment-controlled appliance compartments. The final design must verify the exact I/O count and whether motor-control functions are available rather than assuming features from the generic 8052 family.
Recommended
Building Equipment Interface
W78I052DPG can serve as the local controller in building equipment interfaces that translate switches or sensor inputs into commands for dampers, valves, lighting, or status indicators. The 8 KB Flash is appropriate for fixed configuration logic, and the 40 MHz maximum operating frequency supports responsive debounce and timing routines. The 2.4 V to 5.5 V operating range can simplify integration with powered sensors and communications modules. Engineering validation should cover electrical noise immunity, watchdog behavior, brownout response, and the package's exact ground and supply arrangement because those details are not included in the supplied distributor excerpts.
Recommended
Sensor Conditioning and Data Acquisition
The W78I052DPG can supervise a compact sensor-acquisition node that samples digital sensors, performs threshold decisions, filters noisy inputs, and records operating events. Its 40 MHz 8052-compatible execution engine is suitable for deterministic control logic, while 8 KB Flash can hold calibration tables and a modest protocol handler. Because the supplied data does not confirm the ADC count, analog interfaces, or serial peripheral variants, designs requiring high-resolution analog measurement should first verify those functions in the official datasheet. External conditioning and protection may also be necessary if the sensor interface exceeds the MCU's verified electrical limits.
Recommended
Compact Automation Controller
The W78I052DPG supports compact automation controllers where a deterministic 8-bit CPU, modest program storage, and a 44-pin PLCC package provide a practical platform for machine logic. It can execute sequencing, fault monitoring, and interface management for small production equipment. Its maximum frequency of 40 MHz offers timing margin relative to slower classic 8051 systems, while the 8 KB Flash limit keeps the application focused and discourages reliance on large libraries. Engineers should confirm timer modes, external interrupt capacity, and watchdog availability in the manufacturer documentation before creating a safety- or timing-critical machine interface.
Recommended
Communication Gateway Interface
W78I052DPG can act as the protocol-facing controller in a small gateway when the gateway requires local framing, status reporting, configuration handling, and control of auxiliary I/O rather than high-throughput connectivity. The 8 KB Flash can accommodate a limited protocol stack and configuration application, and the 40 MHz clock provides processing margin for interrupt-driven communication. The verified excerpts do not identify the available UART, SPI, I2C, or CAN configurations, so the selected ordering code must be checked before this use is approved. A gateway also needs robust clocking, reset behavior, and power-supply design validated against the final system requirements.
Recommended
Recommended Products Summary
Engineering reference data for W78I052DPG — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | W78E052DPG | DS89C420-QNL | SC87C51CGA44 |
|---|---|---|---|---|
| Package | PLCC-44 | PLCC-44 | PLCC-44 | PLCC-44 |
| Brand | Nuvoton Technology Corporation | Nuvoton Technology Corporation | Maxim Integrated | Maxim Integrated |
Key Differentiators
- Exact 8052-family device with confirmed headline configuration (vs DS89C420-QNL)
- Same-manufacturer family support (vs W78E052DPG)
- Documented industrial temperature range (vs SC87C51CGA44)
Design Notes
Use the manufacturer PLCC-44 land pattern and pin numbering rather than a generic 44-pin footprint. Verify lead pitch, package outline, pad length, solder-mask geometry, and every power or ground connection against the current datasheet. The supplied evidence confirms a 44-pin PLCC but does not provide the full numbered pinout, so copying a schematic from another 8052-family MCU could misroute clock, reset, programming, or peripheral signals.
The verified operating range is 2.4 V to 5.5 V, so the supply design must remain within that interval under startup, transient, and temperature conditions. Place required bypass capacitors close to the device's specified supply and ground pins and provide clean return paths. The supplied excerpts do not identify current consumption, regulator dropout requirements, brownout thresholds, or power-sequencing constraints; obtain those values before selecting an upstream regulator.
Do not assume that every 8052-compatible MCU has identical RAM, interrupt vectors, timer registers, peripheral connections, or programming interface. Build the replacement comparison around the exact W78E052DPG, DS89C420-QNL, or SC87C51CGA44 datasheets, checking pin names and electrical levels as well as the package. The alternative entries are cross-reference candidates, not blanket approval for firmware-identical drop-in substitution.
Compliance Information
Mouser identifies W78I052DPG as Pb-free, and the indexed manufacturer PDF includes a lead-free parts-information section. Detailed RoHS, REACH, AEC-Q100, halogen-free, and conflict-minerals declarations were not included in the verified excerpts.
