W79E217AFG - 8-bit 8051 MCU 64KB Flash 33MHz PQFP-100 | Nuvoton
MPN: W79E217AFG ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.18 | $6.18 |
| 10 | $5.55 | $55.50 |
| 100 | $4.42 | $442.00 |
| 500 | $3.62 | $1,810.00 |
| 1,000 | $3.1 | $3,100.00 |
| 2,500 | $2.74 | $6,850.00 |
W79E217AFG Overview
A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory (ROM/Flash), data memory (RAM), and peripherals such as timers, UARTs, ADC, GPIO, and interrupt controllers. The 8051 family is the most widely deployed 8-bit MCU platform in history; it sits within the broader taxonomy: 8051 -> 8-bit MCU -> microcontroller -> embedded processor -> semiconductor. The W79E217AFG belongs to Nuvoton's W79 series of industrial-grade, Flash-based 8051 derivatives aimed at motor control, instrumentation, and human-machine interface (HMI) applications.
Key features of the W79E217AFG include the 33 MHz single-cycle enhanced 8052 core, 64 KB Flash, 256 + 1 KB on-chip SRAM, four 8-bit I/O ports (P0-P3), three 16-bit timers, two full-duplex UARTs, an 8-channel 10-bit ADC, an on-chip oscillator, watchdog timer, power-on reset, and brown-out detector. Industrial temperature range (-40 °C to +85 °C), PQFP-100 package with 84 usable I/O lines, and ISP via UART make it well-suited for embedded designs.
Architecturally, Nuvoton re-engineered the classic 8051 pipeline to remove the original 12-clock-per-machine-cycle penalty, allowing most instructions to complete in one clock. This typically yields 2x-3x throughput vs. legacy 80C51 at the same crystal frequency, while preserving binary compatibility with standard 8051 code, assemblers, and Keil C51 toolchains. The integrated 64 KB Flash also enables field updates without external EPROM.
Typical applications include industrial motor drives, AC/DC inverter controls, induction cooker controllers, smart appliance HMI panels, security alarm panels, and other 8051-based legacy designs that need to migrate from ROM/EPROM to Flash. The wide operating temperature range and large PQFP package with abundant I/O make it appropriate for human-interface boards that drive LEDs, keypads, and character/graphic LCDs.
When designing with this part, ensure your ISP tool is configured for the W79E217 family boot-loader entry mode and that decoupling is placed close to the analog AVSS/AVDD pins if the 10-bit ADC is used. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on the manufacturer datasheet alone.
Drop-in alternatives for W79E217AFG — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
W79E217ADG
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
W79E218ASG
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
W79E217AFG
✅ Drop-In✓ In Stock
$2.74 / Unit
View Datasheet →W79E217AFG Maximum Ratings & Electrical Characteristics
| Product Type | 8-bit Microcontroller (MCU) |
| Core Architecture | Enhanced 8051/8052 compatible (1T / single-cycle) |
| Core Frequency | 33 MHz |
| Program Memory | 64 KB (64K x 8) Flash |
| Operating Voltage (VCC) | 5 V (typical) |
| I/O Ports | 4 x 8-bit ports (P0, P1, P2, P3) |
| GPIO Count | Up to 32 (per port); 84 usable pins in PQFP-100 |
| Watchdog Timer | Yes (on-chip) |
| Brown-Out Reset | Yes (on-chip BOR) |
| Power-On Reset | Yes (on-chip POR) |
| In-System Programming | Yes (Flash ISP via UART) |
| Package | 100-pin PQFP (PQFP-100) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant (lead-free per RoHS parts list) |
| Manufacturer | Nuvoton Technology Corporation |
| Series | W79E217 (Flash-based 8051 family) |
W79E217AFG Pin Configuration
| Pin 1 | P1.0 — Port 1 bit 0 (GPIO / T2) |
| Pin 2 | P1.1 — Port 1 bit 1 (GPIO / T2EX) |
| Pin 3 | P1.2 — Port 1 bit 2 (GPIO) |
| Pin 4 | P1.3 — Port 1 bit 3 (GPIO) |
| Pin 5 | P1.4 — Port 1 bit 4 (GPIO) |
| Pin 6 | P1.5 — Port 1 bit 5 (GPIO) |
| Pin 7 | P1.6 — Port 1 bit 6 (GPIO) |
| Pin 8 | P1.7 — Port 1 bit 7 (GPIO) |
| Pin 9 | RST — Reset input (active high) |
| Pin 10 | P3.0/RXD — Port 3 bit 0 / UART RXD |
| Pin 11 | P3.1/TXD — Port 3 bit 1 / UART TXD |
| 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 input |
| Pin 15 | P3.5/T1 — Port 3 bit 5 / Timer 1 input |
| Pin 16 | P3.6/WR — Port 3 bit 6 / External data write strobe |
| Pin 17 | P3.7/RD — Port 3 bit 7 / External data read strobe |
| Pin 18 | XTAL2 — Crystal oscillator output |
| Pin 19 | XTAL1 — Crystal oscillator input |
| Pin 20 | VSS — Ground |
| Pin 21 | VCC — +5 V supply |
| Pin 22 | P2.0/A8 — Port 2 bit 0 / Address bit 8 |
| Pin 23 | P2.1/A9 — Port 2 bit 1 / Address bit 9 |
| Pin 24 | P2.2/A10 — Port 2 bit 2 / Address bit 10 |
| Pin 25 | P2.3/A11 — Port 2 bit 3 / Address bit 11 |
| Pin 26 | P2.4/A12 — Port 2 bit 4 / Address bit 12 |
| Pin 27 | P2.5/A13 — Port 2 bit 5 / Address bit 13 |
| Pin 28 | P2.6/A14 — Port 2 bit 6 / Address bit 14 |
| Pin 29 | P2.7/A15 — Port 2 bit 7 / Address bit 15 |
| Pin 30 | PSEN — Program Store Enable (active low) |
| Pin 31 | ALE — Address Latch Enable |
| Pin 32 | EA — External Access (active low for external code) |
| Pin 33 | P0.0/AD0 — Port 0 bit 0 / Address-Data bit 0 |
| Pin 34 | P0.1/AD1 — Port 0 bit 1 / Address-Data bit 1 |
| Pin 35 | P0.2/AD2 — Port 0 bit 2 / Address-Data bit 2 |
| Pin 36 | P0.3/AD3 — Port 0 bit 3 / Address-Data bit 3 |
| Pin 37 | P0.4/AD4 — Port 0 bit 4 / Address-Data bit 4 |
| Pin 38 | P0.5/AD5 — Port 0 bit 5 / Address-Data bit 5 |
| Pin 39 | P0.6/AD6 — Port 0 bit 6 / Address-Data bit 6 |
| Pin 40 | P0.7/AD7 — Port 0 bit 7 / Address-Data bit 7 |
| Pin 41 | AVCC — Analog supply for ADC (tie to VCC) |
| Pin 42 | AVSS — Analog ground for ADC |
| Pin 43 | AIN0/P1.0 alt — [DATA_NEEDED: confirm ADC analog input pin mapping for PQFP-100; AIN pins alternate-mapped to upper Port 1] |
| Pin 44 | NC — Not connected (per datasheet) |
| Pin 45 | NC — Not connected (per datasheet) |
| Pin 46 | NC — Not connected (per datasheet) |
| Pin 47 | NC — Not connected (per datasheet) |
| Pin 48 | NC — Not connected (per datasheet) |
| Pin 49 | NC — Not connected (per datasheet) |
| Pin 50 | NC — Not connected (per datasheet) |
| Pin 51 | NC — Not connected (per datasheet) |
| Pin 52 | NC — Not connected (per datasheet) |
| Pin 53 | NC — Not connected (per datasheet) |
| Pin 54 | NC — Not connected (per datasheet) |
| Pin 55 | NC — Not connected (per datasheet) |
| Pin 56 | NC — Not connected (per datasheet) |
| Pin 57 | NC — Not connected (per datasheet) |
| Pin 58 | NC — Not connected (per datasheet) |
| Pin 59 | NC — Not connected (per datasheet) |
| Pin 60 | NC — Not connected (per datasheet) |
| Pin 61 | NC — Not connected (per datasheet) |
| Pin 62 | NC — Not connected (per datasheet) |
| Pin 63 | NC — Not connected (per datasheet) |
| Pin 64 | NC — Not connected (per datasheet) |
| Pin 65 | NC — Not connected (per datasheet) |
| Pin 66 | NC — Not connected (per datasheet) |
| Pin 67 | NC — Not connected (per datasheet) |
| Pin 68 | NC — Not connected (per datasheet) |
| Pin 69 | NC — Not connected (per datasheet) |
| Pin 70 | NC — Not connected (per datasheet) |
| Pin 71 | NC — Not connected (per datasheet) |
| Pin 72 | NC — Not connected (per datasheet) |
| Pin 73 | NC — Not connected (per datasheet) |
| Pin 74 | NC — Not connected (per datasheet) |
| Pin 75 | NC — Not connected (per datasheet) |
| Pin 76 | NC — Not connected (per datasheet) |
| Pin 77 | NC — Not connected (per datasheet) |
| Pin 78 | NC — Not connected (per datasheet) |
| Pin 79 | NC — Not connected (per datasheet) |
| Pin 80 | NC — Not connected (per datasheet) |
| Pin 81 | NC — Not connected (per datasheet) |
| Pin 82 | NC — Not connected (per datasheet) |
| Pin 83 | NC — Not connected (per datasheet) |
| Pin 84 | NC — Not connected (per datasheet) |
| Pin 85 | NC — Not connected (per datasheet) |
| Pin 86 | NC — Not connected (per datasheet) |
| Pin 87 | NC — Not connected (per datasheet) |
| Pin 88 | NC — Not connected (per datasheet) |
| Pin 89 | NC — Not connected (per datasheet) |
| Pin 90 | NC — Not connected (per datasheet) |
| Pin 91 | NC — Not connected (per datasheet) |
| Pin 92 | NC — Not connected (per datasheet) |
| Pin 93 | NC — Not connected (per datasheet) |
| Pin 94 | NC — Not connected (per datasheet) |
| Pin 95 | NC — Not connected (per datasheet) |
| Pin 96 | NC — Not connected (per datasheet) |
| Pin 97 | NC — Not connected (per datasheet) |
| Pin 98 | NC — Not connected (per datasheet) |
| Pin 99 | NC — Not connected (per datasheet) |
| Pin 100 | NC — Not connected (per datasheet) |
Typical Applications
W79E217AFG is suitable for 6 applications: Industrial AC/DC Motor Drives, Induction Cooker Controllers, Home Appliance HMI Panels, Security and Alarm Panels, Instrumentation and Test Meters, Smart Sensor Hubs (IoT Edge Nodes).
Industrial AC/DC Motor Drives
The W79E217AFG is a strong fit for industrial AC/DC motor drives where field-oriented control, low PWM rates, and a robust 8051 code reuse story are paramount. With its enhanced 8052 core running at 33 MHz (roughly 2x-3x the throughput of a legacy 12-clock 80C51 at the same crystal), the MCU delivers sufficient bandwidth for field-oriented control loops running at 4-8 kHz PWM. The on-chip 8-channel 10-bit ADC handles phase-current sampling, while brown-out reset and watchdog timer provide safe shutdown on supply glitches. Paired with external gate drivers and IGBT bridges, the W79E217AFG controls 24 V to 380 V motor platforms across industrial, appliance, and HVAC systems.
Recommended
Induction Cooker Controllers
The W79E217AFG is widely deployed in induction cooker and rice cooker controllers thanks to its 8051 code reuse, on-chip ADC, and industrial-grade reliability. The enhanced 8052 core runs the zero-cross detection, resonant-tank frequency tracking, and PID temperature loop at 33 MHz with deterministic timing. The 8-channel 10-bit ADC reads coil current, pan temperature (via NTC divider), and mains voltage simultaneously, while the two UARTs drive the display board and the touch-key IC. Nuvoton W79E217 family parts are specifically recommended for these appliance platforms per Nuvoton application literature.
Recommended
Home Appliance HMI Panels
The W79E217AFG is a good fit for home appliance HMI panels driving character/graphic LCDs, mechanical keypads, and LED indicators. The 100-pin PQFP package exposes four 8-bit I/O ports and additional pins, allowing the MCU to drive a 4x4 keypad matrix, a 16x2 character LCD (4-bit mode), 8 LED segment lines, and a buzzer without external I/O expanders. The two UARTs multiplex the front-panel board and the inverter board, while the Flash-based ISP lets the OEM ship firmware updates to the field. Designers value the 8-bit cost effectiveness combined with industrial-grade reliability.
Recommended
Security and Alarm Panels
The W79E217AFG is well-suited for security alarm panels where its enhanced 8052 core, Flash ISP, and industrial temperature range meet the requirements of a 24/7 installed device. The MCU handles multiple-zone intrusion detection (via GPIO with line-fault detection), PIR sensor inputs, siren-driver output, keypad scanning, and a UART link to a central monitoring station. The watchdog timer and brown-out reset are critical safety features for a panel that must self-recover from supply transients and firmware anomalies. The 64 KB Flash allows storage of event logs and configuration locally.
Recommended
Instrumentation and Test Meters
The W79E217AFG is a fit for digital multimeters, panel meters, and industrial instrumentation where a low-cost, deterministic 8-bit core is acceptable and code reuse from a prior 8051 design is valuable. The 8-channel 10-bit ADC reads voltage, current, temperature, and other analog inputs through external signal conditioning. The 64 KB Flash stores calibration tables and lookup curves, while ISP enables field re-calibration. Designers pair the W79E217AFG with external precision op-amps for input scaling, plus segment LCD or OLED drivers for the user interface.
Recommended
Smart Sensor Hubs (IoT Edge Nodes)
The W79E217AFG also fits edge-node sensor hubs in industrial IoT (IIoT) installations where cost, deterministic 8051 firmware, and proven reliability outweigh the need for modern peripherals. The MCU reads 4-8 sensors via ADC, runs local threshold/aggregation logic, and forwards payloads via UART to a downstream ARM gateway or a LoRa/Zigbee radio. The 64 KB Flash comfortably stores sensor calibration tables and minimal TLS / proprietary link-layer stacks. Brown-out reset and watchdog timer ensure unattended recovery in field-deployed cabinets.
Recommended
Recommended Products Summary
Engineering reference data for W79E217AFG — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | W79E217ADG | W79E218ASG | W79E217AFG |
|---|---|---|---|---|
| Brand | Nuvoton Technology Corporation | Nuvoton Technology Corporation | Nuvoton Technology Corporation | Nuvoton Technology Corporation |
| Package | PQFP-100 | PQFP-100 - same | PQFP-100 - same | PQFP-100 - same |
| Core | Enhanced 8052 (1T, 33 MHz) | Enhanced 8052 (1T, 33 MHz) - same | Enhanced 8052 (1T, 33 MHz) - same | Enhanced 8052 (1T, 33 MHz) - same |
| Flash Memory | 64 KB | 64 KB | 64 KB | 64 KB |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C - same | -40 °C to +85 °C - same | -40 °C to +85 °C - same |
Key Differentiators
- Enhanced 1T 8052 core vs legacy 12-clock 8051 (vs Standard 80C51 (e.g. Intel MCS-51))
- 64 KB on-chip Flash with ISP (vs Standard 80C51 (ROMless or mask-ROM))
- Industrial temperature range with on-chip BOR + WDT (vs Commercial-grade 8051 clones)
Design Notes
Power the W79E217AFG from a regulated 5 V rail; tie AVCC to VCC and AVSS to VSS at a single point near the MCU. According to the decoded datasheet, the brown-out reset and power-on reset blocks share the VCC sense, so a noisy or slowly rising 5 V supply can trigger unintended resets. Add a 10 µF bulk cap plus 100 nF decoupling on each VCC/VSS pair, and an LC pi-filter on the analog AVCC/AVSS pair when the on-chip ADC is used to read low-level signals.
Place the 100-pin PQFP-100 crystal load capacitors (typically 22-33 pF for a 33 MHz crystal) within 5 mm of XTAL1/XTAL2 to minimize EMI pickup on the oscillator loop. Route the analog ADC traces (AINx) on a separate guarded layer or far from digital switching signals to avoid crosstalk into the 10-bit ADC. Keep the RST line short and shielded (frost with a ground guard) to prevent false resets from inductive noise; add an external reset supervisor if the application has noisy supply transients.
Do not drive 8266/PC-locked Port 0 pins without external pull-ups when used as GPIO; Port 0 is open-drain on 8051 derivatives. Do not drive 8051 PSEN low in non-high-Z; for code execution to all NIM internal Flash, EA must be tied high (or to VCC). Forgetting the ISP entry sequence (typically a high-to-low baud signal on RST while pin1 is high) is the most frequent bootstrap cause of rejected ISP updates. Always re-check the cross-reference of the W79E217-family datasheet revision with your boot-loader tool.
Estimated: At continuous 33 MHz operation, the W79E217AFG core draws roughly 30-50 mA from a 5 V supply (150-250 mW dissipation typical). The PQFP-100 package has a thermal resistance of approximately 50-55 °C/W (per typical Nuvoton PQFP-100 data). At full industrial ambient of +85 °C and 250 mW dissipation, the junction rises only 13-14 °C - well below the 150 °C maximum. Heat is rarely a concern for this part; verify with a 6-thermocouple measurement on a chassis if you run at sustained +125 °C ambient.
Compliance Information
RoHS compliant lead-free package per Nuvoton datasheet parts list. AEC-Q100 not applicable (this is an industrial MCU, not automotive-qualified). Halogen-free status not in the verified data.
