ML51UB9AE - 24MHz 16KB Flash 8051 MCU | Nuvoton
MPN: ML51UB9AE ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.8489 | $0.85 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
ML51UB9AE Overview
The 8051 microcontroller is an 8-bit embedded-processing architecture widely used for control-oriented designs because it combines a simple instruction set, broad software heritage, and integrated peripherals. The ML51 series uses a 1T 8051 core, where the T designation refers to the higher-efficiency clocking approach compared with traditional multi-cycle 8051 designs. This allows the ML51UB9AE to reach 24 MHz while retaining compatibility with the established 8051 programming ecosystem.
Key features include up to 24 GPIO pins, a 12-bit analog-to-digital converter, UART, SPI, I²C, PWM timer blocks, a Watchdog Timer, and a Window Watchdog Timer. The 1.8 V to 5.5 V operating range supports both low-voltage battery-powered systems and conventional 5 V equipment. Flash memory supports in-system programming through the dedicated loader ROM, while 1 KB of SRAM provides working memory for embedded control tasks.
The ML51UB9AE is particularly suited to applications requiring moderate processing speed and multiple serial or analog peripherals without the cost and complexity of a larger MCU. Its 24 MHz maximum operating frequency provides useful headroom for protocol handling, state-machine control, signal conditioning, and low-complexity communication. The 12-bit ADC enables direct sensor measurement, reducing the need for external analog front ends in many designs.
Typical applications include smart-home sensor nodes, building-control products, battery-powered instruments, compact motor or actuator controllers, LED-control modules, and low-cost consumer appliances. The 28-SOP package supports conventional through-hole or leaded assembly where appropriate, making the device suitable for both new designs and legacy-style PCB layouts.
Designers should allocate decoupling capacitance close to the supply pins, confirm oscillator and timing requirements against the device documentation, and use the ISP loader flow correctly when programming or updating firmware. Because the ML51UB9AE is an 8051-compatible device, application firmware, bootloader procedures, and peripheral configuration must be checked for exact part and package details.
This page combines verified manufacturer specifications, sourcing information, structured alternatives, and practical design guidance for engineers evaluating the ML51UB9AE.
Drop-in alternatives for ML51UB9AE — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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View Datasheet →ML51UB9AE Maximum Ratings & Electrical Characteristics
| Core Architecture | 1T 8051-based CMOS |
| Maximum Operating Frequency | 24 MHz |
| Operating Voltage Range | 1.8 V to 5.5 V |
| Flash Program Memory | 16 KB |
| SRAM | 1 KB |
| Loader ROM | 4 KB for ISP |
| GPIO Count | Up to 24 GPIO |
| ADC Resolution | 12-bit ADC |
| Serial Interfaces | UART, SPI, I²C |
| Timer Resources | Timers and PWM timers |
| Watchdog Features | Watchdog Timer and Window Watchdog Timer |
| Package | 28-SOP |
| Data Bus Width | 8-bit |
| Programming | ISP supported |
| Normal Run Current | Less than 80 µA/MHz according to series documentation |
| Power-Down Current | Below 1 µA according to series documentation |
| Manufacturer | Nuvoton Technology Corporation |
ML51UB9AE 28-sop Pin Configuration Guide
Pin configuration for ML51UB9AE (28-sop 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 ML51UB9AE.
Refer to the datasheet for full pin configuration.
Typical Applications
ML51UB9AE is suitable for 6 applications: Battery-Powered Sensor Node, Smart Home Control Module, Industrial Sensing and Monitoring, LED Lighting Controller, Compact Actuator Controller, Consumer Appliance Control.
Battery-Powered Sensor Node
The ML51UB9AE fits compact sensor nodes because it combines a 1.8 V to 5.5 V operating range with a 1T 8051 core operating up to 24 MHz. Its 12-bit ADC can measure analog sensor outputs, while UART, SPI, or I²C can connect a sensor or communications module. The low-power characteristics reported for the ML51 series help reduce energy use during idle periods. A practical design would place local decoupling near the supply pins, configure unused peripherals for low power, and use the watchdog functions to recover from unexpected firmware or communication faults.
Recommended
Smart Home Control Module
The ML51UB9AE is suitable for smart-home endpoints that need local control, status reporting, and serial connectivity. Up to 24 GPIO pins can drive indicators, relays, or logic-level interface signals, while the 12-bit ADC supports sensor input. The 16 KB Flash capacity is appropriate for compact protocol handlers, configuration tables, and state machines. Because the device supports both 1.8 V and 5 V class operation, it can simplify designs that include low-voltage sensors, subject to the specific I/O and power-domain limits in the datasheet.
Recommended
Industrial Sensing and Monitoring
The ML51UB9AE can serve as the control MCU in a compact industrial sensing module where a fast 8051 core, ADC, and multiple serial interfaces are valuable. Its 24 MHz maximum frequency provides enough performance for sampling loops, digital filtering, and communication framing, while the 1 KB SRAM accommodates working data for moderate control tasks. The watchdog and window watchdog functions support recovery from stalled software. For production equipment, validate noise immunity, input limits, temperature range, and any required industrial qualification before deployment.
Recommended
LED Lighting Controller
The ML51UB9AE is appropriate for small LED-control and display-control boards where PWM timers, GPIO, and serial configuration are more important than high memory capacity. The timer resources can generate adjustable PWM behavior for LED brightness or indicator control, while the 12-bit ADC can monitor a current or supply signal when the analog input arrangement permits. The 16 KB Flash program area is useful for lighting tables, fade sequences, and communication protocols. Firmware should include thermal and current limits appropriate to the LED load rather than relying on the MCU alone for protection.
Recommended
Compact Actuator Controller
The ML51UB9AE can control small relays, solenoids, stepper-related logic, or other actuator interfaces when the board includes the required driver circuitry. Its GPIO and timer resources support command decoding, motion sequencing, and status feedback, while UART provides a simple host-control interface. The 24 MHz operating speed is well suited to real-time control loops that do not require a high-end MCU. Engineers must add transistor, MOSFET, flyback, and current-limiting stages appropriate to the load, and verify that supply transients do not exceed the device limits.
Recommended
Consumer Appliance Control
The ML51UB9AE is a practical fit for cost-sensitive consumer products such as small appliances, timers, simple keypads, and configuration controllers. Its 8-bit 8051 architecture is easy to support, the 16 KB Flash memory can hold application firmware, and the integrated ADC and serial peripherals reduce external component count. The 28-SOP package also suits leaded assembly strategies where appropriate. Product designers should validate mechanical footprint, programming access, EMI behavior, and recovery behavior in the final enclosure and power-supply design.
Recommended
Recommended Products Summary
Engineering reference data for ML51UB9AE — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ML51UB9AE | ML51UB9AE | ML51UB9AE | ML51UB9AE | ML51UB9AE |
|---|---|---|---|---|---|---|
| Brand | Nuvoton Technology | Nuvoton Technology | Nuvoton Technology | Nuvoton Technology | Nuvoton Technology | Nuvoton Technology |
| Package | 28-SOP | 28-SOP | 28-SOP | 28-SOP | 28-SOP | 28-SOP |
| Core | 1T 8051-based CMOS | 1T 8051-based CMOS | 1T 8051-based CMOS | 1T 8051-based CMOS | 1T 8051-based CMOS | 1T 8051-based CMOS |
| Maximum Frequency | 24 MHz | 24 MHz | 24 MHz | 24 MHz | 24 MHz | 24 MHz |
| Operating Voltage | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V |
| Flash Memory | 16 KB | 16 KB | 16 KB | 16 KB | 16 KB | 16 KB |
| SRAM | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB |
| ADC | 12-bit ADC | 12-bit ADC | 12-bit ADC | 12-bit ADC | 12-bit ADC | 12-bit ADC |
| Serial Interfaces | UART, SPI, I²C | UART, SPI, I²C | UART, SPI, I²C | UART, SPI, I²C | UART, SPI, I²C | UART, SPI, I²C |
Key Differentiators
- 1T 8051 core with 24 MHz operation (vs Traditional multi-cycle 8051 designs)
- Wide supply-voltage coverage (vs Fixed 5 V or narrow-voltage MCU designs)
- Integrated mixed-signal and serial peripherals (vs 8051 MCUs requiring multiple external interface devices)
- ISP update support (vs MCUs that require a dedicated external programmer for every update)
- Compact 28-SOP integration (vs Larger-package MCUs with comparable core functionality)
Design Notes
Place the supply bypass capacitor as close as practical to the ML51UB9AE power pins and keep the return path short. The ML51 family is specified for 1.8 V to 5.5 V operation, so the selected regulator must have adequate transient response for GPIO loads, ADC references, and any attached peripherals. Confirm whether all I/O and ADC functions are available at the chosen supply voltage rather than assuming the full device range applies identically to every pin.
Route oscillator and high-speed clock connections away from analog input and serial signal traces. Keep the ISP programming interface accessible without allowing noisy external wiring to couple directly into sensitive ADC or clock nodes. The 28-SOP footprint is leaded, but the same basic separation remains important: analog inputs should have quiet returns, digital switching should stay away from reference paths, and power distribution should remain continuous.
Do not substitute an 8051 device solely because it uses the same instruction set. Confirm the 28-SOP pin assignment, oscillator pins, reset behavior, programming interface, memory size, ADC mapping, and peripheral multiplexing. The available verified data does not identify an independent pin-compatible substitute, so replacement work should begin with a manufacturer comparison and a prototype-level power and peripheral test.
Use the watchdog and Window Watchdog Timer as part of the embedded safety strategy, but initialize and verify them early in firmware. A watchdog is not a substitute for correct brownout behavior, supply filtering, or actuator protection. For battery-powered systems, measure the actual current in active, idle, and power-down modes because the listed ML51 series figures are family-level values and the final consumption depends on peripherals and board leakage.
Reserve the loader ROM and ISP workflow for firmware updates, but protect programming access in production products. Confirm the required ISP interface, reset sequence, flash timing, and firmware version policy before field deployment. The 4 KB loader ROM is a resource defined for ISP support and should not be treated as additional general-purpose application memory.
Compliance Information
The supplied verified data does not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status for ML51UB9AE. Compliance must be confirmed with the manufacturer or the authorized distributor before regulated production use.
