W78E051C40PL - 8-bit 8051 MCU, 4KB Flash, 40MHz, 44-PLCC | Nuvoton
Teilenummer: W78E051C40PL ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $2.95 | $2,95 |
| 10 | $2.55 | $25,50 |
| 100 | $1.95 | $195,00 |
| 500 | $1.62 | $810,00 |
| 1.000 | $1.38 | $1.380,00 |
W78E051C40PL Übersicht
An 8051 microcontroller (technically an MCS-51 family MCU) is an 8-bit Harvard-architecture CISC microcomputer originally introduced by Intel in 1980; despite its age the family remains popular in cost-sensitive, deterministic, deeply embedded applications because of its tiny footprint, predictable interrupt latency, and unparalleled third-party tool support. As a Flash EPROM variant the W78E051C family sits at the highest tier of the classic 8051 hierarchy: mask-ROM < OTP EPROM < Flash EPROM, with Flash enabling ISP and field-upgradeable firmware. In the broader taxonomy, an MCU is a programmable subset of a microprocessor and, more generally, a digital integrated circuit under power management and embedded-computing classifications.
Key features include 4 KB Flash program memory, 128 bytes internal RAM, 36 general-purpose digital I/O lines, two 16-bit timers/counters, one UART with framing-error detection, six interrupt sources with two priority levels, on-chip oscillator with external crystal, power-saving Idle and Power-Down modes, and an in-system programming (ISP) interface through the serial port. According to the datasheet the device supports a wide operating frequency range, allowing software to reduce clock speed dynamically for power-sensitive applications.
Architecturally, the W78E051C uses a 12-clock-per-machine-cycle core (the classic 8051 convention) with separate 64 KB program and 64 KB external-data address spaces, plus a 256-byte internal RAM space split between register banks, bit-addressable area, and user RAM. The Flash memory subsystem provides on-chip page-erase and byte-program capability, supporting in-application firmware updates via the UART bootloader on PLCC-package variants.
Typical applications include industrial control subsystems, home appliance mainboards, keyboard/mouse scanners, sensor signal conditioning, low-cost USB bridges, LED display drivers, and legacy 8051 firmware upgrades. The wide frequency range and low-power Idle/Power-Down modes make it suitable for both mains-powered controllers and battery-backed utilities.
Design-wise, ensure the EA/VPP pin is tied to VCC for internal-Fetch operation, or driven to +12 V only during parallel programming. Decouple VCC and AVCC (if present) with 0.1 microfarad ceramic capacitors placed within 5 mm of the pins to suppress switching noise during oscillator start-up and ISP writes.
This page synthesizes distributor pricing, cross-reference drop-in alternatives (Nuvoton W78E052 and W78E058 variants) and practical PCB layout notes not consolidated in the manufacturer datasheet.
Drop-in-Alternativen für W78E051C40PL – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
W78E052C40PL
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
W78E058DPG
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
W78E052BU40PL
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
W78E052BUX40PL
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
W78E052DPG
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
W78E051C40PL Grenzwerte & elektrische Eigenschaften
| Core Architecture | 8-bit 8051 (MCS-51 compatible) |
| Program Memory (Flash) | 4 KB (4K x 8) |
| Internal RAM | 128 bytes |
| Maximale Taktfrequenz | 40 MHz |
| I/O Pins | 36 (4 x 8-bit ports P0-P3, plus 4-bit P4) |
| Timers/Counters | 2 x 16-bit |
| UART | 1 x full-duplex |
| Interrupt Sources | 6 sources / 2 priority levels |
| Gehäuse | 44-PLCC (PL) |
| Montageart | Surface Mount (PLCC socket or direct solder) |
| Machine Cycle | 12 clocks per instruction cycle |
| Power-Saving Modes | Idle and Power-Down |
| On-chip Oscillator | Yes (external crystal/ceramic resonator) |
| RoHS-Status | Compliant |
| Lead-Free | Yes |
W78E051C40PL Pin-Konfiguration
| Pin 1 | P1.0 — Port 1 bit 0 (bidirectional I/O) |
| Pin 2 | P1.1 — Port 1 bit 1 |
| Pin 3 | P1.2 — Port 1 bit 2 |
| Pin 4 | P1.3 — Port 1 bit 3 |
| Pin 5 | P1.4 — Port 1 bit 4 |
| Pin 6 | P1.5 — Port 1 bit 5 |
| Pin 7 | P1.6 — Port 1 bit 6 |
| Pin 8 | P1.7 — Port 1 bit 7 |
| Pin 9 | RST — Reset input (active high) |
| Pin 10 | P3.0 (RXD) — Port 3 bit 0 / UART receive |
| Pin 11 | P3.1 (TXD) — Port 3 bit 1 / UART transmit |
| Pin 12 | P3.2 (INT0) — Port 3 bit 2 / External interrupt 0 |
| Pin 13 | P3.3 (INT1) — Port 3 bit 3 / External interrupt 1 |
| Pin 14 | P3.4 (T0) — Port 3 bit 4 / Timer 0 external input |
| Pin 15 | P3.5 (T1) — Port 3 bit 5 / Timer 1 external input |
| Pin 16 | P3.6 (WR) — Port 3 bit 6 / External data memory write strobe |
| Pin 17 | P3.7 (RD) — Port 3 bit 7 / External data memory read strobe |
| Pin 18 | XTAL2 — Crystal oscillator output |
| Pin 19 | XTAL1 — Crystal oscillator input |
| Pin 20 | GND — Ground |
| Pin 21 | P2.0 — Port 2 bit 0 (A8 address bus when external memory used) |
| Pin 22 | P2.1 — Port 2 bit 1 |
| Pin 23 | P2.2 — Port 2 bit 2 |
| Pin 24 | P2.3 — Port 2 bit 3 |
| Pin 25 | P2.4 — Port 2 bit 4 |
| Pin 26 | P2.5 — Port 2 bit 5 |
| Pin 27 | P2.6 — Port 2 bit 6 |
| Pin 28 | P2.7 — Port 2 bit 7 |
| Pin 29 | PSEN — Program Store Enable (external ROM read strobe) |
| Pin 30 | ALE — Address Latch Enable |
| Pin 31 | EA/VPP — External Access / Programming voltage (tie to VCC for internal ROM) |
| Pin 32 | P4.0 — Port 4 bit 0 (additional I/O) |
| Pin 33 | P4.1 — Port 4 bit 1 |
| Pin 34 | P4.2 — Port 4 bit 2 |
| Pin 35 | P4.3 — Port 4 bit 3 |
| Pin 36 | P0.0 — Port 0 bit 0 (AD0 multiplexed address/data when external memory used) |
| Pin 37 | P0.1 — Port 0 bit 1 |
| Pin 38 | P0.2 — Port 0 bit 2 |
| Pin 39 | P0.3 — Port 0 bit 3 |
| Pin 40 | P0.4 — Port 0 bit 4 |
| Pin 41 | P0.5 — Port 0 bit 5 |
| Pin 42 | P0.6 — Port 0 bit 6 |
| Pin 43 | P0.7 — Port 0 bit 7 |
| Pin 44 | VCC — Positive power supply |
Typische Anwendungen
W78E051C40PL ist geeignet für 6 Anwendungs: Industrial Control Subsystems, Home Appliance Mainboards, Keyboard and Mouse Scanners, Sensor Signal Conditioning and Display Drivers, Legacy 8051 Firmware Upgrades, Low-Cost LED Display Drivers.
Industrial Control Subsystems
The W78E051C40PL's deterministic 8051 core, 36 digital I/O lines, and wide operating frequency range suit it for industrial control subsystems such as relay driving, motor start/stop logic, and sensor multiplexing. Its 4 KB Flash holds typical ladder-replacement code, while the bit-addressable ports enable single-pin manipulation crucial for opto-isolated I/O. The MCU's Power-Down mode drops quiescent to microampere levels for always-on industrial nodes, and the 44-PLCC package survives legacy factory-floor retrofits where sockets simplify field replacement.
Empfohlen
Home Appliance Mainboards
White-goods designs (washing machines, microwave ovens, dishwashers, induction cookers) lean on the W78E051C40PL for its 8051 toolchain maturity, abundant bit-addressable I/O for button matrices and seven-segment displays, and low-cost Flash EPROM that supports field firmware revisions. The 40 MHz clock drives PWM routines for motor-speed loops and the full-duplex UART links to inverter modules or BLE add-on boards. Power-Down mode plus the wide frequency range allows a single MCU to manage both standby (<1 mA) and active (<10 mA) states in Energy-Star compliant appliances.
Empfohlen
Keyboard and Mouse Scanners
HID input devices like PS/2-era keyboards and optical mice run comfortably on the W78E051C40PL because the bit-addressable ports scan key matrices efficiently and the two hardware timers debounce switches without software overhead. The UART delivers PS/2-to-USB bridging or wireless dongle protocols, while the 4 KB Flash comfortably holds scan-code translation tables plus macro logic. ISP via the UART bootloader lets manufacturers update keymaps post-production without a programmer socket, and the PLCC socket option accelerates RMA field replacements.
Empfohlen
Sensor Signal Conditioning and Display Drivers
The W78E051C40PL fronts analog sensor arrays with its 36 digital I/O driving multiplexers and 7-segment / LCD digit drivers, while the two 16-bit timers generate precise PWM excitation for temperature, pressure, and humidity transducers. The 6-source / 2-level interrupt controller prioritizes fast sensor-alert responses alongside UART telemetry. The 4 KB Flash accommodates lookup-table linearization for thermocouples and RTDs in HVAC and metering applications, and the wide frequency range lets the same MCU serve battery-powered meters and mains-powered controllers.
Empfohlen
Legacy 8051 Firmware Upgrades
Designers retrofitting older 8051-based boards turn to the W78E051C40PL because it drops into standard 8051 PLCC-44 sockets while upgrading OTP/mask ROM parts to in-system programmable Flash. Existing firmware compiles unchanged thanks to MCS-51 binary compatibility, and the ISP feature enables remote firmware revision via the UART without swapping the chip. The 40 MHz ceiling accelerates legacy routines, the Power-Down mode matches older standby budgets, and the same PLCC-44 footprint preserves PCB layout, heatsinking provisions, and connector placement for legacy industrial enclosures.
Empfohlen
Low-Cost LED Display Drivers
Scrolling message signs, elevator floor displays, and traffic indicators use the W78E051C40PL to drive multiplexed LED matrices because the bit-addressable ports provide column/row control, while the two hardware timers generate refresh intervals without software jitter. The 4 KB Flash holds font tables and animation routines, the UART accepts command packets from a host controller, and the Power-Down mode keeps mains-fail standby power below regulatory thresholds. The PLCC-44 package supports through-hole mounting on large display PCBs where surface-mount fine-pitch QFP would be impractical.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für W78E051C40PL – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | W78E052C40PL | W78E058DPG | W78E052BU40PL | W78E052BUX40PL | W78E052DPG |
|---|---|---|---|---|---|---|
| Brand | Nuvoton Technology Corporation | Nuvoton Technology Corporation | Nuvoton Technology Corporation | Nuvoton Technology Corporation | Nuvoton Technology Corporation | Nuvoton Technology Corporation |
| Package | 44-PLCC | 44-PLCC (same) | 44-PLCC (same) | 44-PLCC (same) | 44-PLCC (same) | 44-PLCC (same) |
| Flash Program Memory | 4 KB | 8 KB | 32 KB | 8 KB | 8 KB | 8 KB |
| Maximum Clock Frequency | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| I/O Pins | 36 | 36 | 36 | 36 | 36 | 36 |
| Timers/Counters | 2 x 16-bit | 2 x 16-bit | 3 x 16-bit | 2 x 16-bit | 2 x 16-bit | 3 x 16-bit |
| ISP Bootloader | Yes (UART) | Yes (UART) | Yes (UART) | Yes (enhanced) | Yes (latest rev) | Yes (UART) |
Wichtigste Unterscheidungsmerkmale
- Lowest Flash-memory entry point in the W78E052 family (vs. W78E052C40PL)
- Smaller code footprint than W78E058 for cost-sensitive designs (vs. W78E058DPG)
- Original PLCC-44 8051 Flash with stable Rev A4 datasheet (vs. W78E052BUX40PL)
Designhinweise
Decouple the W78E051C40PL VCC pin with a 0.1 microfarad ceramic capacitor placed within 5 mm of the package pin and a 10 microfarad bulk electrolytic on the same supply rail. Add a series ferrite bead if the supply is shared with relays or high-side drivers, because the 8051 core is sensitive to VCC droop during ISP writes. Tie the EA/VPP pin to VCC for internal program fetch and avoid leaving it floating. Estimated: total quiescent current remains below 1 mA at 5V in Power-Down mode.
Route the XTAL1/XTAL2 traces symmetrically and keep them short to minimize stray capacitance, which detunes the crystal oscillator and can push the W78E051C40PL off its 40 MHz maximum. Place the load capacitors immediately adjacent to the XTAL pins and provide a ground guard ring on both sides of the crystal traces to suppress noise coupling into adjacent analog inputs. Avoid routing high-speed digital signals parallel to the crystal traces to prevent oscillator jitter on UART baud timing.
Do not drive EA/VPP above VCC during normal operation, because the W78E051C40PL enters parallel programming mode if EA is raised to approximately +12 V. Always ground unused pins on port 0 (which has no internal pull-ups) to prevent floating inputs that draw supply current and may latch into metastable states during reset. When migrating from an older 8051 mask-ROM part, verify that PSEN is not being driven by external memory at boot, otherwise the internal Flash boot path is bypassed.
Compliance-Informationen
RoHS compliance per Nuvoton product page. AEC-Q100 not applicable for this general-purpose industrial MCU. Halogen-free status not stated in the verified datasheet excerpt.
