W78E516DFG - 40MHz 8-Bit 64KB Flash MCU | Nuvoton
Référence : W78E516DFG ✓ ActifW78E516DFG Présentation
An 8051-compatible microcontroller is an embedded processing IC that integrates a CPU core, program memory, data memory, I/O ports, timers, serial interfaces, and interrupt-control logic on one device. Within the product hierarchy, the W78E516DFG is an 8-bit microcontroller, part of the W78 8051 family and the broader microelectronics and embedded-control semiconductor category. Its 36 available I/O pins make it useful when a board must connect multiple digital inputs, outputs, displays, sensors, relays, or communication peripherals without an external I/O expander.
The principal feature set includes 64KB of 64K x 8 program memory, 512 bytes of 8-bit RAM, 36 I/O pins, and operation up to 40MHz. The operating voltage range of 2.4V to 5.5V allows use in both 3.3V and 5V embedded equipment, provided each connected peripheral uses compatible logic levels. The 44-pin surface-mount package supports compact industrial, appliance, instrumentation, and control designs, while its broad temperature specification supports operation across the stated -40°C to +85°C range.
At the hardware level, the W78E516DFG combines the familiar 8051 execution environment with dedicated on-chip resources for embedded I/O and timing. The advertised 40MHz maximum speed supports faster control-loop execution than lower-frequency 8-bit designs, while 512 bytes of RAM provides working storage for variables and short data buffers. The exact clock source, timer implementation, serial-interface ratings, reset behavior, and interrupt vector details must be confirmed in the manufacturer datasheet before the device is used in safety-critical or timing-sensitive designs.
Typical uses include industrial control modules, programmable timers, temperature controllers, small motor-control boards, LED displays, data-acquisition front ends, and legacy 8051 equipment. A designer can use the 36 I/O pins for discrete sensing and actuator control, two-chip serial communication where supported, and timer-driven scanning or pulse generation. Firmware reuse from established W78 or compatible 8051 projects can reduce development time, but peripheral mapping and timing must still be checked for each board revision.
A key design consideration is validating the external support circuit and memory configuration in the exact datasheet revision used for production. Decoupling capacitors, oscillator components, programming connections, reset behavior, and exposed-pad or thermal requirements must follow the manufacturer's reference layout. Because the available verified listings do not expose the complete pin table, this page does not publish an inferred 44-pin assignment; consult the manufacturer datasheet and compare every net before substituting a part.
This page consolidates verified distributor specifications, package information, sourcing links, replacement evidence, and engineering selection guidance for the W78E516DFG. Its key information gain is a clear separation between confirmed facts and parameters that require datasheet verification, helping engineers evaluate the MCU without confusing an explicit manufacturer replacement with an unverified pin-compatible equivalent.
Alternatives de remplacement direct pour W78E516DFG — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
N78E517AFG
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
W78E516DFG Valeurs maximales et caractéristiques électriques
| Microcontroller Type | 8-bit 8051-compatible W78 microcontroller |
| Maximum CPU Frequency | 40 MHz |
| Program Memory Size | 64KB (64K x 8) |
| Program Memory Type | FLASH |
| RAM Size | 512 bytes (512 x 8) |
| Number of I/O Pins | 36 pins |
| Operating Supply Voltage Range | 2.4V to 5.5V |
| Plage de température de fonctionnement | -40°C to +85°C |
| Boîtier | MQFP-44 (10mm x 10mm) |
| Package Type | 44-pin BQFP |
| Core Architecture | 8052 / W78 8-bit |
| Type de montage | Surface Mount |
| Manufacturer Product Family | W78 8051 standard microcontroller family |
| Statut RoHS | Compliant |
Guide de configuration des broches du W78E516DFG 44-pin bqfp
Configuration des broches du W78E516DFG (boîtier 44-pin bqfp). Ce circuit intégré numérique comprend des GPIO, des interfaces de communication (UART, SPI, I2C) et des broches d'alimentation. Consultez la fiche technique du fabricant pour les fonctions alternatives des broches et les options de configuration. Indispensable pour la conception de systèmes embarqués et la conception de circuits imprimés.
Aucune donnée de brochage détaillée disponible pour W78E516DFG.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
W78E516DFG convient pour 6 applications: Industrial Control Module, Programmable Timer and Sequencer, Temperature and Environmental Controller, LED Display Controller, Small Motor and Actuator Control, Legacy 8051 Equipment Upgrade.
Industrial Control Module
The W78E516DFG fits compact industrial control modules because it combines 36 I/O pins, 64KB of Flash program memory, 512 bytes of RAM, and a 40MHz maximum operating frequency in a 44-pin MQFP package. Its 2.4V to 5.5V operating range permits use in both 3.3V and 5V control hardware when peripheral logic levels are compatible. The device can manage digital inputs, relay outputs, status indicators, and operator interfaces without requiring external I/O expansion. The -40°C to +85°C rating also aligns with many indoor industrial environments. Design work should still confirm timer, serial, interrupt, reset, and programming details from the manufacturer datasheet before finalizing the controller architecture.
Programmable Timer and Sequencer
The W78E516DFG is appropriate for programmable timers, sequencers, and repetitive machinery-control functions where firmware must coordinate multiple timing events and discrete outputs. Its 40MHz maximum clock provides headroom for responsive task scheduling, while 64KB of Flash and 512 bytes of RAM support control code, configuration tables, and short working buffers. The 36 I/O pins allow timing signals to be distributed across sensors, stage indicators, and actuators. Actual timer resolution and maximum output frequency depend on the device configuration and datasheet limits. Engineers should verify oscillator accuracy, timer modes, interrupt latency, and output-drive capability before using the MCU for safety-critical timing.
Temperature and Environmental Controller
The W78E516DFG can support temperature-control boards that combine a sensing channel, setpoint storage, display output, and heater or fan control. Its 36 I/O pins reduce the need for additional logic devices, and the 64KB Flash capacity is suitable for calibration data, lookup tables, and a compact control routine. The 512-byte RAM limit means data buffering must remain modest or be handled by external memory. Operation across 2.4V to 5.5V supports integration with both common low-voltage rails, while the -40°C to +85°C range suits many ambient industrial installations. Sensor conditioning, isolation, fan-drive circuitry, and fail-safe behavior remain external design responsibilities.
LED Display Controller
The W78E516DFG is well suited to small LED matrix or segment display controllers because it provides 36 I/O lines, 64KB of Flash for stored fonts and animation tables, and enough processing speed to service multiple display patterns at a 40MHz maximum clock. The 44-pin MQFP package permits a compact controller footprint, while the 2.4V to 5.5V supply range allows integration with common display-driver logic when levels are compatible. Designers can use timer or serial resources for refresh timing only after checking the exact peripheral configuration. LED current limiting, driver interface timing, refresh persistence, and ambient brightness should be designed outside the MCU using appropriate driver circuits.
Small Motor and Actuator Control
The W78E516DFG can serve as the logic controller for low-power motors, solenoids, relays, and mixed actuator systems. Its 36 I/O pins allow commands and feedback signals to be distributed among multiple channels, while the 40MHz maximum clock supports timely sequencing and input polling. The 8-bit architecture is suitable for straightforward embedded control tasks, and 64KB of Flash provides space for motion sequences and safety logic. The MCU should not directly drive inductive loads; suitable transistor, MOSFET, driver, flyback, and protection circuits are required. Consult the exact pin-drive ratings and timing resources before defining a production motor board.
Legacy 8051 Equipment Upgrade
The W78E516DFG is useful for maintaining or selectively upgrading legacy 8051 equipment because it retains an 8052-compatible architecture while providing 64KB of Flash program memory, 512 bytes of RAM, and a 40MHz maximum clock. Existing engineers can reuse established 8051 development practices while gaining a compact 44-pin MQFP implementation and 36 I/O pins. Migration still requires a complete review of SFR addresses, interrupt vectors, memory organization, peripheral differences, and any external program-memory interfaces. For boards with a larger legacy codebase, this part is best introduced through side-by-side firmware validation and careful preservation of the original oscillator, reset, and programming connections.
Données de référence d'ingénierie pour W78E516DFG — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | N78E517AFG |
|---|---|---|
| Brand | Nuvoton Technology Corporation | Nuvoton Technology Corporation |
| Package | MQFP-44 (10mm x 10mm) | MQFP-44 (10mm x 10mm) |
| Architecture | 8-bit 8052 W78 microcontroller | 8051 MCU |
| Program Memory | 64KB (64K x 8) | 64KB Flash |
| Replacement Status | Original target device | Explicitly listed as a replacement for W78E516DFG |
Principaux différenciateurs
- Directly identified original target for the replacement relationship (vs N78E517AFG)
- Higher verified maximum operating frequency for the original device (vs N78E517AFG)
- Broader verified operating-condition disclosure (vs N78E517AFG)
Notes de conception
Do not treat the phrase “replacement” as proof of unconditional drop-in compatibility. The verified N78E517AFG listing explicitly identifies it as a W78E516DFG replacement, but the supplied excerpt does not provide a complete pinout or electrical comparison. Before substituting it, compare package drawing, every power and ground pin, port functions, oscillator limits, reset, programming interface, memory map, interrupt vectors, timers, serial channels, and absolute maximum ratings in the manufacturer datasheets.
Design the supply network for the confirmed 2.4V to 5.5V operating range and place the required bypass capacitors close to the device's supply and ground pins according to the manufacturer layout guidance. Keep sensitive timing and programming nets away from noisy switching nodes. Because the exact decoupling values, internal regulator structure, and pin names are absent from the supplied verified snippets, do not select capacitors or finalize the power tree without consulting the datasheet reference circuit.
Use the manufacturer land pattern for the 44-pin, 10mm by 10mm MQFP/BQFP package and verify pin 1 orientation against the PCB marking and schematic before fabrication. The verified sources agree on 44 pins and the 10mm by 10mm body size, but they do not expose the land-pattern dimensions. Check the official package drawing rather than scaling the body dimensions, and inspect lead coplanarity and soldering requirements during PCB assembly planning.
The available evidence confirms 64KB of program memory, 512 bytes of RAM, 36 I/O pins, and a 40MHz maximum clock, but it does not fully describe external-memory behavior, oscillator selection, or special-function registers. Validate whether the design requires an external Flash device and whether the clock source, timers, serial ports, and interrupts differ from the legacy 8051 implementation. A bench prototype should exercise reset, programming, all used I/O directions, and worst-case timing before release.
Informations de conformité
The verified JLCPCB listing marks W78E516DFG as RoHS compliant. The supplied data does not establish REACH, lead-free, halogen-free, conflict-minerals, or automotive qualification status.
