MCF51AC256BCLKE - 32-bit ColdFire V1 MCU, 256KB Flash, 50MHz | NXP
N.º de pieza: MCF51AC256BCLKE ✗ Fin de vida| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $4.08 | $4,08 |
| 10 | $3.85 | $38,50 |
| 100 | $3.55 | $355,00 |
| 500 | $3.25 | $1.625,00 |
| 1.000 | $3.05 | $3.050,00 |
MCF51AC256BCLKE Descripción general
A microcontroller (MCU) is a single integrated circuit that combines a processor core, program memory, data memory, and peripherals such as timers, serial interfaces, and watchdogs into one chip. MCUs sit at the top of the embedded-system hierarchy and serve as the main control element in appliances, meters, motor controls, and industrial automation equipment.
Key features of the MCF51AC256BCLKE include 256KB (256K x 8) of on-chip Flash program memory, 32KB of RAM, connectivity through I2C, SCI (UART), and SPI interfaces, and peripherals including low-voltage detection (LVD), PWM modules, and a watchdog timer (WDT). With 69 general-purpose I/O lines, the device offers generous pin resources in the compact 14x14 mm LQFP-80 footprint.
Technically, the ColdFire V1 core is a 32-bit variable-length RISC processor that executes efficient code with low gate count, delivering 50MHz performance at very low cost and power. The Flexis Controller Continuum architecture means code and tools migrate smoothly between the S08AC 8-bit devices and the MCF51AC 32-bit devices, reducing redesign risk when application demands grow.
Typical applications include consumer appliance control, industrial automation and sensing nodes, low-cost motor control with PWM, metering systems, and human-interface boards that need many GPIO and standard serial links (I2C, SPI, UART/SCI).
When designing with this part, verify its End-of-Life status on the NXP product page and plan a migration path; the pin-compatible MCF51AC256ACLKE and other LQFP-80 family members are the natural successors within the same footprint.
This page synthesizes verified distributor pricing, drop-in family alternatives, application guidance, and design notes not found in the manufacturer datasheet.
Alternativas directas para MCF51AC256BCLKE — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con MCF51AC256BCLKE (mismo factor de forma y huella) — difiere en Package, Core Processor, Mounting Type, ADC, Core Size.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
MCF51AC256ACLKE
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MCF51AC256BCLKER
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MCF51AC128BCLKE
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
MCF51AC256BCLKE-QF
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
MCF51AC256BCLKE Valores máximos y características eléctricas
| Core Processor | ColdFire V1 |
| Core Size | 32-bit |
| Maximum Clock Speed | 50 MHz |
| Program Memory Size | 256 KB (256K x 8) |
| Program Memory Type | FLASH |
| RAM Size | 32 KB |
| EEPROM Size | N/A |
| Connectivity | I2C, SCI, SPI |
| Peripherals | LVD, PWM, WDT |
| Number of I/O | 69 |
| Encapsulado | LQFP-80 (14x14 mm) |
| Tipo de montaje | Surface Mount |
| Series | MCF51AC (Flexis) |
| Part Status | End of Life (per NXP product page) |
Guía de configuración de pines de MCF51AC256BCLKE lqfp-80 (14x14 mm)
Configuración de pines para MCF51AC256BCLKE (encapsulado lqfp-80 (14x14 mm)). Este CI digital incluye GPIO, interfaces de comunicación (UART, SPI, I2C) y pines de alimentación. Consulte la hoja de datos del fabricante para conocer las funciones alternativas de los pines y las opciones de configuración. Esencial para el diseño de sistemas embebidos y el diseño de PCB.
No hay datos detallados de patillaje disponibles para MCF51AC256BCLKE.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
MCF51AC256BCLKE es adecuado para 6 aplicacións: Appliance Control Boards, Industrial Automation and Sensing Nodes, Low-Cost Motor Control, Metering and Data Loggers, Human Interface and Display Controllers, Legacy System Maintenance and BOM Continuity.
Appliance Control Boards
The MCF51AC256BCLKE fits appliance control such as washers, cookers, and HVAC controllers because its 256KB Flash holds feature-rich firmware including UI logic and communication stacks, while the 50MHz ColdFire V1 core executes control loops deterministically. The 69 GPIO drive relays, buttons, LEDs, and displays directly, and I2C/SPI connect sensors and EEPROMs. PWM outputs handle heater or fan control. Because Flexis parts are tool-compatible with S08AC 8-bit devices, appliance makers can scale designs up or down without changing toolchains. Note the EOL status: design updates should target the pin-compatible family successors.
Recomendado
Industrial Automation and Sensing Nodes
In factory automation nodes, the MCF51AC256BCLKE combines a 32-bit 50MHz ColdFire V1 core with I2C, SPI, and SCI (UART) links suited to MODBUS-style serial communication and sensor acquisition. The 32KB RAM buffers sensor data and protocol frames, while the watchdog timer (WDT) and low-voltage detection (LVD) improve field robustness - both are mandatory features in industrial environments where brownouts and hangs must be handled autonomously. With 256KB Flash, protocol stacks plus diagnostics coexist comfortably. Choose the pin-compatible MCF51AC256ACLKE for new sourcing given the EOL designation of the 'B' part.
Recomendado
Low-Cost Motor Control
The integrated PWM peripherals of the MCF51AC256BCLKE make it a fit for fan, pump, and small motor control. The 50MHz 32-bit core runs PID or commutation firmware with margin, PWM outputs drive power stages through gate drivers, and the LVD protects against unsafe operation during supply dips. 69 GPIO allow interfacing with hall sensors, encoders, and fault-feedback lines simultaneously. Since 256KB Flash exceeds typical motor-control needs, firmware growth (diagnostics, fieldbus) is absorbed without a redesign - a common constraint on smaller MCUs. Respect the EOL status in new designs and validate the MCF51AC256ACLKE as successor.
Recomendado
Metering and Data Loggers
Utility metering and data-logging products benefit from the MCF51AC256BCLKE's 256KB Flash (firmware plus calibration tables plus logging headroom) and 32KB RAM for record buffers. SCI/UART handles meter-bus style communication, I2C connects RTCs and EEPROMs, and SPI interfaces precision ADC front ends for measurement channels. The 50MHz ColdFire V1 core performs accumulation and scaling math faster than typical 8-bit parts at a similar cost point, thanks to the Flexis positioning at the low end of the 32-bit ColdFire family. Power and temperature limits should be confirmed in the NXP datasheet for the meter environment.
Recomendado
Human Interface and Display Controllers
With 69 GPIO, the MCF51AC256BCLKE can directly drive segmented LCD alternatives such as LED matrices, keypads, and indicator arrays, while SCI/I2C links talk to host processors. The 256KB Flash accommodates graphics tables and multi-language strings, and the 50MHz core keeps scan and debounce loops responsive. PWM channels support backlight dimming and buzzer tones. The Flexis tool compatibility allows a single engineering team to maintain both 8-bit (S08AC) low-cost HMI variants and this 32-bit variant with shared code. For new layouts, source the pin-compatible MCF51AC256ACLKE instead of the EOL 'B' version.
Recomendado
Legacy System Maintenance and BOM Continuity
A major remaining use of the MCF51AC256BCLKE is sustaining production of existing designs after NXP declared End of Life. Because the Flexis MCF51AC256 family is pin-, peripheral-, and tool-compatible, boards can be re-populated with the MCF51AC256ACLKE (same LQFP-80 footprint, same 256KB/32KB memory) with minimal revalidation. The tape-and-reel MCF51AC256BCLKER remains available at DigiKey, extending buy time. Engineers should secure last-time-buy stock now and prepare firmware regression tests against the 'A' variant to de-risk the transition, documenting any errata differences between revisions.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para MCF51AC256BCLKE — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | MCF51AC256ACLKE | MCF51AC256BCLKER | MCF51AC128BCLKE | MCF51AC256BCLKE-QF |
|---|---|---|---|---|---|
| Package | LQFP-80 (14x14 mm) | LQFP-80 (14x14 mm) - same | LQFP-80 (14x14 mm) - same | LQFP-80 (14x14 mm) - same | LQFP-80 (14x14 mm) - same |
| Brand | NXP Semiconductors (Freescale legacy) | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Core / Speed | ColdFire V1, 32-bit, 50 MHz | ColdFire V1, 32-bit, 50 MHz | ColdFire V1, 32-bit, 50 MHz | ColdFire V1, 32-bit, 50 MHz | ColdFire V1, 32-bit, 50 MHz |
| Flash | 256 KB | 256 KB | 256 KB | 128 KB | 256 KB |
| RAM | 32 KB | 32 KB | 32 KB | 16 KB | 32 KB |
| GPIO Count | 69 | 69 | 69 | 69 | 69 |
Diferenciadores clave
- Larger memory than 128KB family siblings (frente a MCF51AC128BCLKE)
- Newer 'B' silicon revision (frente a MCF51AC256ACLKE)
- Flexis tool compatibility (frente a MC9S08AC family 8-bit devices)
Notas de diseño
The MCF51AC256BCLKE is officially End of Life per the NXP product page. Before committing any new PCB spin, confirm remaining lifetime buys and validate the pin-compatible MCF51AC256ACLKE (same LQFP-80 footprint, same 256KB Flash) on your board. Keep at least one full production lot of the 'B' part as a reference lot for regression comparison, and record errata differences between the 'A' and 'B' silicon revisions in your design documentation.
The LQFP-80 (14x14 mm) footprint uses 0.5 mm pitch gull-wing leads; specify the land pattern per the NXP MCF51AC256 datasheet package drawing rather than generic IPC calculators. Decouple the VDD pins with 100 nF ceramics placed within 2 mm of each supply pin plus one bulk 4.7-10 uF per rail (estimated values - confirm against the datasheet power recommendations). The exposed no-connect corners of the LQFP should remain free of traces to aid inspection of all 80 joints.
Use the on-chip low-voltage detection (LVD) and watchdog timer (WDT) in every build - they are free features on this MCU and protect field units from brownout-induced corruption. Estimated: at 50MHz the ColdFire V1 core current is in the tens of mA range (exact figure available in the NXP datasheet), so a single 3.3V LDO rated at 100-150 mA covers the MCU plus typical I2C/SPI peripherals with margin. Sequence power so GPIO do not back-drive unpowered peripherals through the 69 I/O lines.
Información de cumplimiento
The NXP product page includes an Environmental Quality tab, but compliance specifics for this MPN were not present in the verified web data and are marked unknown.
