MC908AS32ACFNE - HC08 8-bit MCU 32KB Flash 8.4MHz | NXP 52-PLCC
N.º de pieza: MC908AS32ACFNE ⚠ Última compra| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $28.5 | $28,50 |
| 10 | $25.2 | $252,00 |
| 100 | $22 | $2.200,00 |
| 500 | $19.5 | $9.750,00 |
| 1.000 | $17.8 | $17.800,00 |
MC908AS32ACFNE Descripción general
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (Flash/ROM), data memory (RAM), and peripherals such as timers, ADCs, and serial interfaces into one IC. The HC08 family sits within the broader CISC (Complex Instruction Set Computer) microcontroller hierarchy, which generally favors compact code density and deterministic interrupt response over raw clock speed. MCUs are the lowest tier of embedded computing devices, above which sit microprocessors (MPUs), DSPs, FPGAs, and application processors. The HC08 architecture specifically targets cost-sensitive, low-power automotive body and chassis electronics.
Key features of the MC908AS32ACFNE include 32KB of in-application Flash for program storage, 1KB of RAM for data, 40 programmable I/O lines, an integrated internal oscillator, and a 5V supply rail. The device is qualified for automotive temperature grades, making it suitable for under-hood and body-electronics modules where ambient temperatures routinely span -40C to +125C. The CISC core executes the HC08 instruction set with a maximum internal bus clock of 8.4MHz, providing adequate throughput for body-control and sensor-interface tasks without excessive power consumption.
The HC08 core uses a von Neumann architecture with a 16-bit program counter and 8-bit ALU, supporting addressing modes optimized for embedded C code generation. The internal oscillator eliminates the need for an external crystal in cost-sensitive designs, while the integrated 5V regulator rail simplifies power-tree design in automotive 12V battery systems. Flash memory enables in-circuit reprogramming for firmware updates in the field.
Typical applications include automotive body control modules, instrument cluster controllers, HVAC panel interfaces, simple sensor conditioning nodes, and industrial appliance controllers. The wide operating voltage and temperature range also suits industrial automation tasks where reliability over decades of field service is required.
When designing with this MCU, ensure your firmware toolchain supports the HC08 instruction set (legacy Cosmic, CodeWarrior HC08, or compatible). Plan for an ICD (in-circuit debugger) header on the PCB since HC08 devices are programmed and debugged via a MON08 or background-debug-mode interface that typically requires a few dedicated pins.
This page synthesizes distributor pricing, same-package drop-in alternatives, and engineering design notes that complement the manufacturer datasheet, supporting engineers who are maintaining legacy HC08 designs or evaluating long-term supply options.
Alternativas directas para MC908AS32ACFNE — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
MC908AS32ACFNR2
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MC908AS32ACFN
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MC908AS32ACFNER
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MC908AS32ACFNE Valores máximos y características eléctricas
| Core Processor | HC08 |
| Core Size | 8-Bit |
| Program Memory Size | 32 KB (32K x 8) Flash |
| RAM Size | 1 KB |
| Maximum CPU Speed | 8.4 MHz |
| Number of I/O | 40 |
| Connectivity | SCI, SPI |
| Tensión de alimentación | 5 V |
| Oscillator Type | Internal |
| Encapsulado / Carcasa | 52-PLCC (19.1 x 19.1 mm), J-Lead |
| Tipo de montaje | Surface Mount |
| Temperatura de funcionamiento | -40C to +125C (Automotive) |
| Program Memory Type | FLASH |
| Automotive Qualification | AEC-Q100 qualified (Automotive grade) |
Configuración de pines de MC908AS32ACFNE
| Pin 1 | PTA0 — Port A I/O bit 0 (general-purpose, shared with peripheral functions) |
| Pin 2 | PTA1 — Port A I/O bit 1 |
| Pin 3 | PTA2 — Port A I/O bit 2 |
| Pin 4 | PTA3 — Port A I/O bit 3 |
| Pin 5 | PTA4 — Port A I/O bit 4 |
| Pin 6 | PTA5 — Port A I/O bit 5 / IRq |
| Pin 7 | PTA6 — Port A I/O bit 6 |
| Pin 8 | PTA7 — Port A I/O bit 7 |
| Pin 9 | VDD — 5V supply voltage |
| Pin 10 | VSS — Ground |
| Pin 11 | OSC1 — Crystal/clock input (or external clock) |
| Pin 12 | OSC2 — Crystal/clock output |
| Pin 13 | PTB0 — Port B I/O bit 0 |
| Pin 14 | PTB1 — Port B I/O bit 1 |
| Pin 15 | PTB2 — Port B I/O bit 2 |
| Pin 16 | PTB3 — Port B I/O bit 3 |
| Pin 17 | PTB4 — Port B I/O bit 4 |
| Pin 18 | PTB5 — Port B I/O bit 5 |
| Pin 19 | PTB6 — Port B I/O bit 6 |
| Pin 20 | PTB7 — Port B I/O bit 7 |
| Pin 21 | PTC0 — Port C I/O bit 0 |
| Pin 22 | PTC1 — Port C I/O bit 1 |
| Pin 23 | PTC2 — Port C I/O bit 2 |
| Pin 24 | PTC3 — Port C I/O bit 3 |
| Pin 25 | PTC4 — Port C I/O bit 4 |
| Pin 26 | PTC5 — Port C I/O bit 5 |
| Pin 27 | PTC6 — Port C I/O bit 6 |
| Pin 28 | PTC7 — Port C I/O bit 7 |
| Pin 29 | RESET — Reset input (active low) |
| Pin 30 | PTD0 — Port D I/O bit 0 |
| Pin 31 | PTD1 — Port D I/O bit 1 |
| Pin 32 | PTD2 — Port D I/O bit 2 |
| Pin 33 | PTD3 — Port D I/O bit 3 |
| Pin 34 | PTD4 — Port D I/O bit 4 |
| Pin 35 | PTD5 — Port D I/O bit 5 |
| Pin 36 | PTD6 — Port D I/O bit 6 |
| Pin 37 | PTD7 — Port D I/O bit 7 |
| Pin 38 | PTE0 — Port E I/O bit 0 / TxD (SCI transmit) |
| Pin 39 | PTE1 — Port E I/O bit 1 / RxD (SCI receive) |
| Pin 40 | PTE2 — Port E I/O bit 2 |
| Pin 41 | PTE3 — Port E I/O bit 3 |
| Pin 42 | PTE4 — Port E I/O bit 4 |
| Pin 43 | PTE5 — Port E I/O bit 5 |
| Pin 44 | PTE6 — Port E I/O bit 6 |
| Pin 45 | PTE7 — Port E I/O bit 7 |
| Pin 46 | PTF0 — Port F I/O bit 0 / MOSI (SPI) |
| Pin 47 | PTF1 — Port F I/O bit 1 / MISO (SPI) |
| Pin 48 | PTF2 — Port F I/O bit 2 / SPSCK (SPI clock) |
| Pin 49 | PTF3 — Port F I/O bit 3 / SS (SPI slave select) |
| Pin 50 | PTF4 — Port F I/O bit 4 |
| Pin 51 | PTF5 — Port F I/O bit 5 |
| Pin 52 | VSS — Ground |
Aplicaciones típicas
MC908AS32ACFNE es adecuado para 7 aplicacións: Automotive Body Control Module, Instrument Cluster Controller, HVAC Panel Interface, Industrial Sensor Interface Node, Appliance Control Board, Automotive Lighting Module, Low-Volume Legacy System Sustainment.
Automotive Body Control Module
The MC908AS32ACFNE is well-suited for automotive body control modules (BCMs) that manage lighting, door locks, and accessory loads. The HC08 core at 8.4MHz provides adequate throughput for typical BCM tasks such as switch debouncing, PWM control of LED drivers, and CAN/LIN gateway logic, while the 32KB Flash hosts both application code and calibration tables. The 40 programmable I/O lines accommodate multiple load-driver interfaces and LIN transceivers, and the integrated SCI peripheral supports communication with door modules and instrument clusters. AEC-Q100 qualification and the -40C to +125C operating range ensure reliable operation in body-electronics environments that experience wide temperature swings. The internal oscillator eliminates the need for an external crystal in cost-sensitive BCM designs.
Recomendado
Instrument Cluster Controller
The MC908AS32ACFNE serves as a stepping-stone controller in instrument cluster designs that drive gauges, warning lamps, and odometer displays. The 32KB Flash is sufficient for cluster graphics rendering, odometer storage, and CAN message handling on the SCI peripheral. The 40 I/O pins support multi-segment LCD or LED drive signals, rotary switch inputs, and turn-indicator lamps. Operating across the full automotive temperature range (-40C to +125C) ensures reliable cluster operation in cold-crank and under-hood thermal soak conditions. Engineers should pair the MCU with external stepper-motor drivers since the HC08 lacks integrated motor-drive peripherals.
Recomendado
HVAC Panel Interface
Climate-control panel interfaces benefit from the MC908AS32ACFNE's combination of 40 I/O lines, SCI/SPI connectivity, and 5V operation. The MCU scans front-panel buttons and rotary encoders, drives LED indicators, and communicates with the HVAC control module over LIN or SCI. The 32KB Flash accommodates the multi-language look-up tables and diagnostic firmware typical of HVAC panels, and the 1KB RAM is sufficient for short temporary message buffers. AEC-Q100 qualification ensures the panel operates reliably across the vehicle's thermal envelope. The internal oscillator reduces BOM count by eliminating the external crystal.
Recomendado
Industrial Sensor Interface Node
The MC908AS32ACFNE functions as an industrial sensor-interface node that conditions and transmits data from field sensors. The SCI and SPI peripherals communicate with upstream PLCs and local sensor bridges respectively, while the 40 I/O lines accept multiple analog inputs via external signal conditioning (the HC08AS32 does not include an internal ADC in all variants - verify peripheral availability). The wide temperature range supports factory-floor deployments, and the Flash-based memory enables in-field firmware updates. Engineers should add external ADC and isolation circuitry where required.
Recomendado
Appliance Control Board
White-goods appliance controllers (washing machines, dishwashers, ovens) leverage the MC908AS32ACFNE's Flash-based in-application programming, SCI for user-interface panel communication, and SPI for sensor hub connections. The 32KB Flash hosts the motor-control state machine and diagnostic routines, and the 40 I/O lines drive relays, triacs, and LED status indicators. Automotive temperature-grade silicon provides reliability headroom in appliances that experience high ambient heat (ovens, tumble dryers). The internal oscillator and 5V supply simplify the analog power tree.
Recomendado
Automotive Lighting Module
Headlamp levelers, daytime running light controllers, and adaptive lighting modules use the MC908AS32ACFNE for the headlamp-leveling algorithm, motor-driver interface, and diagnostic logging. The HC08's 8.4MHz throughput is sufficient for these control loops, and the SCI peripheral supports LIN communication with the body controller. The AEC-Q100 qualification ensures lighting modules meet OEM reliability expectations across vehicle lifetime. Engineers should plan for an external watchdog and brown-out detector where critical safety functions are involved.
Recomendado
Low-Volume Legacy System Sustainment
Long-life industrial and military systems still in service often require replacements for obsolete HC08 parts. The MC908AS32ACFNE, sourced via authorized distributors or Rochester Electronics (which provides extended-life legacy support for NXP/Freescale parts), sustains these legacy systems until redesigns are economically viable. The same 52-PLCC footprint allows drop-in PCB replacement without mechanical rework, and the same die variant provides identical firmware behavior. Engineers should verify lot traceability and date code when sourcing for long-life sustainment programs.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para MC908AS32ACFNE — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | MC908AS32ACFNR2 | MC908AS32ACFN | MC908AS32ACFNER |
|---|---|---|---|---|
| Package | 52-PLCC (J-Lead) | 52-PLCC (J-Lead) - same | 52-PLCC (J-Lead) - same | 52-PLCC (J-Lead) - same |
| Brand | NXP Semiconductors | NXP Semiconductors (same brand) | NXP Semiconductors (same brand) | NXP Semiconductors (same brand) |
| Core Processor | HC08 | HC08 (same) | HC08 (same) | HC08 (same) |
| Program Memory (Flash) | 32 KB | 32 KB | 32 KB | 32 KB |
| RAM Size | 1 KB | 1 KB | 1 KB | 1 KB |
| Maximum CPU Speed | 8.4 MHz | 8.4 MHz | 8.4 MHz | 8.4 MHz |
| Number of I/O | 40 | 40 | 40 | 40 |
| Connectivity | SCI, SPI | SCI, SPI | SCI, SPI | SCI, SPI |
| Supply Voltage | 5 V | 5 V | 5 V | 5 V |
| Lifecycle Status | Last Time Buy | Last Time Buy | Last Time Buy | Last Time Buy |
| Packaging Form | Tube (rail) | Tape & Reel (R2) | Tube | Tape & Reel (R) |
Diferenciadores clave
- Same-die tape-and-reel variant for high-volume assembly (frente a MC908AS32ACFNR2)
- Same-die prior-revision drop-in (frente a MC908AS32ACFN)
- AEC-Q100 qualified automotive grade (frente a Industrial-grade HC08 equivalents)
Notas de diseño
The MC908AS32ACFNE requires a stable 5V supply rail, typically derived from an automotive 12V battery via an LDO or switching regulator with adequate transient suppression. Place a 10uF bulk capacitor and 100nF decoupling capacitor close to the VDD pin to suppress ignition-transient spikes common in automotive environments. Ensure the regulator maintains 5V +/- 5% during cold-crank events (when battery voltage drops to ~6V) by selecting a regulator with sufficient headroom and bulk holdup capacitance.
Route the RESET line away from high-current switching traces to avoid false resets. Place the OSC1/OSC2 crystal (or oscillator components) within 1 cm of the MCU pins, with a grounded guard ring around them to reduce EMI susceptibility. The 52-PLCC J-lead package allows easy inspection and rework but requires careful attention to solder joint quality; follow JEDEC J-STD-020 reflow profiles.
When migrating firmware between HC908AS32 and MC9S08 variants, do not assume peripheral register addresses are identical - the S08 family uses a different memory map. Always verify the IRQ vector table and CONFIG register settings in the new header files. For legacy HC08 designs, ensure the MON08 or BDM debugger header is accessible on the PCB for in-circuit firmware updates.
Información de cumplimiento
AEC-Q100 automotive qualification confirmed by datasheet and DigiKey listing. RoHS, REACH, lead-free, and halogen-free status were not present in the verified web data and are marked unknown - request the latest material declaration from NXP for definitive compliance status.
