W78E051DLG - 8-Bit 40MHz 4KB Flash 8051 MCU | Nuvoton
Référence : W78E051DLG ✓ ActifW78E051DLG Présentation
A microcontroller, or MCU, is a semiconductor that integrates a CPU core, flash program memory, data memory, and peripherals into one device. Within the embedded-control hierarchy, the W78E051DLG belongs to the 8-bit 8051/8052 MCU family rather than a 16-bit or 32-bit microcontroller. Its role is to execute embedded firmware, monitor digital inputs, drive outputs, and communicate with sensors, actuators, human-interface devices, and industrial peripherals.
The key specifications of this device are a 40 MHz clock, 4 KB flash for firmware storage, and a 2.4 V to 5.5 V operating range. Verified distributor listings describe the part as an 8052 W78 microcontroller with 4K x 8 flash and Pb-free construction. The 48-pin LQFP-48 package measures 7 mm by 7 mm and provides a practical pin count for external interfacing, clocking, reset, programming, and mixed-signal control applications.
The 8052-compatible architecture is appropriate for cost-sensitive embedded designs that rely on established compiler, debugger, and programming-tool ecosystems. At 40 MHz, the processor offers considerably more instruction throughput than legacy 8-bit systems operating near 12 MHz or 24 MHz. The available verified data does not state the RAM capacity, peripheral set, oscillator options, ADC performance, or timer configuration, so those parameters should be confirmed in the manufacturer datasheet before final schematic or firmware design.
Typical uses for the W78E051DLG include compact industrial controllers, appliance control boards, data-acquisition modules, LED and display systems, and 8-bit sensor-hub designs. The 36 I/O indicated in one distributor listing provides a practical basis for digital control, while the 4 KB flash limit makes the device best suited to firmware with modest code size. Applications requiring substantial buffer storage, high-resolution analog conversion, or large protocol stacks should verify those requirements before committing to the part.
Design planning should begin by confirming the complete pin assignment, peripheral multiplexing, and programming interface in the manufacturer datasheet. The LQFP-48 footprint also requires deliberate decoupling, clock-routing, and reset-layout planning to avoid analog-noise coupling and startup problems. Because the verified listings provide only a partial specification set, procurement decisions should not rely on distributor summaries alone.
This page consolidates distributor pricing, availability, package information, and verified electrical attributes while separating confirmed data from unconfirmed parameters. It also provides a same-family drop-in comparison framework and practical design notes that are not present in a standard distributor catalog entry.
Alternatives de remplacement direct pour W78E051DLG — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec W78E051DLG (même facteur de forme et même empreinte) — différant par Core Architecture, Microcontroller Type.
W78E052DLG
✅ Remplacement direct ⚠️ Spécifications non vérifiéesContactez-nous pour le prix
Voir la fiche technique →W78E054DLG
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
W78E055DLG
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
W78E056DLG
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
W78E051DLG Valeurs maximales et caractéristiques électriques
| Microcontroller Type | 8-bit 8052-compatible W78 microcontroller |
| Fréquence d'horloge maximale | 40 MHz |
| Flash Memory Size | 4 KB |
| Flash Organization | 4K x 8 |
| Tension d'alimentation de fonctionnement | 2.4 V to 5.5 V |
| Number of I/O Pins | 36 pins |
| Package Type | 48-pin LQFP |
| Package Dimensions | 7 mm x 7 mm |
| Plage de température de fonctionnement | -40C to +70C |
| Lead-Free Status | Pb-free |
| Statut RoHS | Compliant |
| Core Architecture | 8052-compatible 8-bit embedded core |
| Type de montage | Surface mount |
Guide de configuration des broches du W78E051DLG 7 mm x 7 mm
Configuration des broches du W78E051DLG (boîtier 7 mm x 7 mm). 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 W78E051DLG.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
W78E051DLG convient pour 6 applications: Compact Industrial Control Boards, Appliance and Household Controller, LED Lighting and Display Control, Serial Data Acquisition Module, RS-485 Field-Bus Sensor Hub, Educational and Embedded Processor Training.
Compact Industrial Control Boards
The W78E051DLG fits compact industrial control boards where an 8-bit controller, 36 reported I/O pins, and a 2.4 V to 5.5 V supply range are sufficient. It can supervise relay outputs, read discrete sensors, and manage machine-state logic without the memory cost of a 32-bit MCU. The 40 MHz operating frequency provides additional instruction headroom over legacy 8051 designs, while the 4 KB flash limit requires a disciplined firmware budget and frequent code-size review. Confirm watchdog, isolation, and EMC requirements during industrial qualification.
Recommandé
Appliance and Household Controller
The W78E051DLG can serve as the central controller in a compact appliance or household device that uses discrete buttons, LEDs, relays, and simple sensors. Its 8052-compatible instruction set supports established embedded toolchains, and the 48-pin LQFP-48 package provides enough connections for control signals without requiring a very large PCB. The 4 KB flash capacity is appropriate for firmware with modest state logic; standby behavior, wake sources, and timer resources should be verified in the manufacturer datasheet. A 3.3 V implementation is possible within the stated 2.4 V to 5.5 V range.
Recommandé
LED Lighting and Display Control
The W78E051DLG is suitable for LED-lighting controllers and compact display-control boards where the required behavior is limited to pattern generation, button handling, and status monitoring. Its 36 reported I/O pins allow multiple LED or switch signals to be managed, while the 40 MHz clock provides useful margin for timed multiplexing or debouncing. Because the 4 KB flash limit restricts graphical rendering and elaborate effects, a larger-flash W78E05 family member may be preferable when assets or complex animation data are required. Verify PWM channels and maximum port drive current before assigning LED loads.
Recommandé
Serial Data Acquisition Module
The W78E051DLG can act as the supervisory controller in a modest serial data-acquisition module that receives commands, validates basic measurements, and formats output. Its 8052-compatible core and 40 MHz clock are adequate for protocol framing and supervisory logic, while the LQFP-48 footprint leaves more I/O than a small 20-pin package. The confirmed 4 KB flash and unknown RAM capacity make this most appropriate for short firmware with bounded data buffers. Verify UART count, baud-rate tolerance, and the peripheral clocking arrangement in the manufacturer datasheet.
Recommandé
RS-485 Field-Bus Sensor Hub
The W78E051DLG is a reasonable candidate for a small RS-485 sensor hub that polls digital or simple analog sensors and reports their state to a host. The 40 MHz processor supports responsive serial handling, and the reported 36 I/O pins provide a practical margin for indicators, configuration switches, and bus isolation controls. Firmware must remain within the 4 KB flash limit, and the absence of verified RAM, ADC, and UART details prevents a definitive design release. The -40C to +70C listing supports commercial-temperature indoor equipment rather than unqualified outdoor deployment.
Recommandé
Educational and Embedded Processor Training
The W78E051DLG is well suited to instruction, evaluation boards, and embedded-systems training because it combines a legacy-compatible 8-bit architecture with a modern 40 MHz operating frequency and a readily sourced 48-LQFP footprint. Students can exercise timer-based control, serial communication, interrupt handling, and flash-resident firmware without the complexity of a 32-bit development platform. The small 4 KB flash space also teaches useful embedded budgeting and code-size discipline. A practical lab should still include the programming interface, a regulated supply, decoupling, and a logic-compatible debug adapter confirmed by the manufacturer.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour W78E051DLG — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | W78E052DLG | W78E054DLG | W78E055DLG | W78E056DLG |
|---|---|---|---|---|---|
| Brand | Nuvoton Technology Corporation | Nuvoton Technology Corporation | Nuvoton Technology Corporation | Nuvoton Technology Corporation | Nuvoton Technology Corporation |
| Package | LQFP-48 (7x7 mm) | LQFP-48 (7x7 mm) - same footprint | LQFP-48 (7x7 mm) - same footprint | LQFP-48 (7x7 mm) - same footprint | LQFP-48 (7x7 mm) - same footprint |
| CPU Architecture | 8-bit 8052-compatible W78 core | 8-bit 8052-compatible W78 core | 8-bit 8052-compatible W78 core | 8-bit 8052-compatible W78 core | 8-bit 8052-compatible W78 core |
| Maximum Clock Frequency | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| Flash Memory | 4 KB (4K x 8) | 8 KB | 16 KB | 32 KB | 64 KB |
| Operating Supply Voltage | 2.4 V to 5.5 V | 2.4 V to 5.5 V | 2.4 V to 5.5 V | 2.4 V to 5.5 V | 2.4 V to 5.5 V |
| Number of I/O Pins | 36 pins | 36 pins | 36 pins | 36 pins | 36 pins |
| Operating Temperature Range | -40C to +70C | -40C to +70C | -40C to +70C | -40C to +70C | -40C to +70C |
Principaux différenciateurs
- Smallest confirmed flash option in the compared W78E05 LQFP-48 set (vs W78E052DLG)
- Confirmed 40 MHz operating frequency for the target device (vs W78E054DLG)
- Lower-voltage operation within a 2.4 V to 5.5 V range (vs W78E055DLG)
- Practical 48-pin surface-mount footprint with 36 reported I/O (vs W78E056DLG)
Notes de conception
Place the MCU supply bypass capacitor immediately across the associated VDD and VSS pins rather than at the edge of the board. Route the oscillator and reset signals away from switching nodes and high-current load drivers. The verified data confirms a 48-pin LQFP-48 package but does not provide the numbered pin map, so the land pattern, decoupling positions, exposed supply pins, and programming pins must be taken directly from the manufacturer package drawing before PCB release.
Do not treat the distributor's 40 MHz headline as proof that every clock configuration runs at 40 MHz. Verify the permissible oscillator range and any relationship among supply voltage, machine cycle, and clock speed in the manufacturer datasheet. Likewise, 36 reported I/O pins do not establish that every port can simultaneously source the maximum current needed by relays, LEDs, or displays. Confirm port drive strength and total supply-current limits before assigning loads.
The 2.4 V to 5.5 V operating range supports both 3.3 V and 5 V systems, but every connected device must share a compatible logic level or require level translation. Include local decoupling, a regulator with appropriate transient margin, and a defined power-up sequence. If the board connects to motors, relays, or long external cables, add separate protection and filtering so switching transients do not corrupt the MCU supply or clock reference.
Firmware must be sized against the confirmed 4 KB flash limit, including the bootloader, interrupt vectors, constants, and room for future revisions. Build a release check into the firmware pipeline that fails when code and read-only data exceed the device limit. Because RAM capacity, ADC channels, UART resources, and timer functions were not provided in the verified data, avoid final peripheral allocation until the current manufacturer datasheet and pin multiplexing table have been checked.
Keep sensitive analog or sensor inputs away from oscillator, high-current LED, relay-driver, and switching-power traces. Provide a quiet return path beneath the device and isolate analog routing from digital switching where the board area allows. If the W78E051DLG is used for measurement rather than discrete-only control, obtain the verified ADC architecture, reference voltage, acquisition time, and input-impedance requirements before finalizing the front end.
Informations de conformité
The LCSC product listing identifies the W78E051DLG as RoHS compliant, and the Mouser listing identifies it as Pb-free. The commercial -40C to +70C rating is not an automotive qualification. REACH, halogen-free, and conflict-minerals declarations were not present in the supplied data and are therefore recorded as unknown.