MC908AP32ACBE - 8-bit HC08 MCU 32KB Flash 8MHz | NXP
MPN： MC908AP32ACBE ✗ 停產MC908AP32ACBE 概覽
An 8-bit microcontroller is an integrated circuit that combines a processor core, memory, and peripherals on a single chip, executing instructions on 8-bit data words. Within the power-management and control hierarchy, an MCU sits above discrete logic and below 32-bit application processors, making it the workhorse for embedded control systems. The HC08 family from Motorola/Freescale (now NXP) is a legacy architecture descended from the popular 6805 core, widely used in appliance, automotive, and industrial designs throughout the 1990s and 2000s.
Key features of the MC908AP32ACBE include 32KB (32K x 8) of in-circuit-programmable FLASH program memory, 2KB (2K x 8) of RAM, and an internal oscillator rated for 8MHz bus operation, which eliminates the need for an external crystal in many designs. The device provides 30 general-purpose I/O lines, giving ample connectivity for switches, relays, displays, and serial peripherals in through-hole systems.
Architecturally, the part is based on the enhanced M68HC08 CPU core with a von Neumann memory map, stack pointer-based C-friendly programming model, and a low-power WAIT and STOP mode set. The internal high-speed oscillator (HS OSC) simplifies clocking, while FLASH non-volatility allows field firmware updates. Because it is a mature HC08 device, mature development toolchains and third-party programmers remain available from legacy-support channels.
Typical applications include white-goods appliance control boards, industrial sensor and actuator controllers, automotive body-electronics sub-modules, battery chargers, and legacy-equipment maintenance where a through-hole 42-pin SDIP footprint must be preserved. The 5V supply range makes it directly compatible with legacy 5V industrial logic families.
A key design consideration is availability: this is a mature product primarily supplied through aftermarket and authorized excess channels such as Rochester Electronics, so new designs should evaluate the newer S08 family. Verify exact peripheral configuration (timers, ADC, SCI) against the manufacturer datasheet before design reuse.
This page synthesizes distributor listings, cross-reference guidance, and lifecycle notes for the MC908AP32ACBE that are not consolidated in any single manufacturer document, helping engineers secure obsolete inventory or identify drop-in same-family alternatives.
直接替換替代品，適用於 MC908AP32ACBE — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： MC908AP32ACBE （相同外形與佔位） — 差異在於 Package, Program Memory Size, Mounting Type, Core, Supply Voltage.
MC908AP8ACBE
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →MC908AP4ACBE
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
MC908AP16ACBE
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →MC908AP64
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
MC908AP32ACBE 最大額定值與電氣特性
| Core Architecture | 8-bit HC08 |
| Core Family | HC08 |
| Maximum Clock Speed | 8 MHz |
| Oscillator Type | Internal |
| Program Memory Size | 32 KB (32K x 8) FLASH |
| RAM Size | 2 KB (2K x 8) |
| Number of I/O | 30 |
| Operating Voltage Range | 4.5 V to 5.5 V |
| 封裝 / 外殼 | 42-SDIP (0.600", 15.24mm) |
| 安裝類型 | Through Hole |
| Packaging | Tube |
| Supplier Device Package | 42-PDIP |
| Program Memory Type | FLASH |
| Product Category | 8-bit Microcontrollers - MCU |
| Description | MCU 32K FLSH HS OSC |
MC908AP32ACBE 42-pdip 腳位配置指南
MC908AP32ACBE（42-pdip 封裝）的腳位配置。 此數位 IC 包含 GPIO、通訊介面（UART、SPI、I2C）與電源腳位。替代腳位功能與配置選項請參閱製造商資料表。對嵌入式系統設計與 PCB 佈局至關重要。
無詳細腳位定義資料： MC908AP32ACBE.
請參閱 資料表 以查看完整腳位配置。
典型應用
MC908AP32ACBE 適用於 6 應用s: Appliance Control Boards, Industrial Sensor and Actuator Controllers, Legacy Equipment Maintenance and Repair, Battery Charger Controllers, Automotive Body Electronics Sub-Modules, Educational and Prototyping Systems.
Appliance Control Boards
The MC908AP32ACBE fits appliance control applications such as washing machines, dishwashers, and refrigerator controllers because its 32KB FLASH holds complete control state machines, its 30 I/O lines drive relays, buttons, and seven-segment displays directly, and its 4.5V to 5.5V supply matches legacy 5V industrial logic. In these designs the MCU typically reads NTC temperature sensors via an external ADC or comparator, sequences motor relays and valves, and drives a user interface. The internal 8MHz oscillator removes the cost and failure points of an external crystal, a major benefit in vibration-prone white-goods environments. Through-hole SDIP packaging also simplifies repair-oriented, double-sided wave-soldered PCBs.
推薦
Industrial Sensor and Actuator Controllers
In factory-floor control panels, the MC908AP32ACBE serves as a compact programmable controller for conveyors, pumps, and simple sequencing tasks. Its 32KB FLASH accommodates lookup tables, PID routines, and communication handlers, while the 2KB RAM buffers sensor history and state. The 5V supply interfaces directly with legacy 24V-referred I/O conditioning built from optocouplers and transistor drivers at 5V logic levels. The through-hole 42-pin SDIP package withstands the thermal cycling and handling of industrial panel maintenance, where field technicians replace sockets-mounted ICs. Firmware stored in FLASH can be reprogrammed in the field using standard HC08 monitor-mode tools, extending equipment service life without hardware changes.
推薦
Legacy Equipment Maintenance and Repair
The most common present-day use of the MC908AP32ACBE is repairing and sustaining equipment originally designed around the HC08 AP family: medical auxiliary devices, test instruments, automotive service tools, and industrial machines. Because the part is socketed in many of these designs, a direct SDIP replacement restores function without PCB modification. Its exact die-level compatibility with original firmware is guaranteed by the unchanged HC08 architecture and memory map, so no reprogramming is needed when replacing a failed device with an identical pre-programmed part. Aftermarket suppliers such as Rochester Electronics supply the device with original-manufacturer tooling, making it a certified continuity solution for end-of-service-life fleets.
推薦
Battery Charger Controllers
The MC908AP32ACBE is well suited to smart battery chargers for industrial and consumer packs. The 32KB FLASH holds charge-curve algorithms including constant-current, constant-voltage, and trickle phases, while 30 I/O lines handle LED status indication, key detection, and charging-FET drive. The 5V rail is typically generated from an offline supply secondary, and the internal oscillator keeps the timing budget for termination timers without external clock components. The MCU monitors battery voltage and current through a low-cost serial ADC, terminating charge on -dV/dt or temperature criteria. WAIT and STOP modes reduce standby consumption when charging is complete, an important feature for always-plugged adapters.
推薦
Automotive Body Electronics Sub-Modules
HC08 AP-series MCUs were widely deployed in automotive sub-modules such as seat controllers, mirror adjusters, lighting modules, and window lifters. The MC908AP32ACBE's 32KB FLASH supports diagnostic code, LIN-like polling routines, and failure logging, while its robust 5V operation tolerates the load-dump-conditioned 5V regulator outputs used in vehicle electronics. Its through-hole SDIP package was favored in modules reflowed with mixed technology or service-replaceable boards. Present use is dominated by aftermarket repair of these modules, where matching the original programmed MCU preserves immobilizer and configuration data. When sourcing replacements, verify temperature grade against the original marking, as automotive variants carried different suffixes.
推薦
Educational and Prototyping Systems
The HC08 family remains a teaching platform for 8-bit embedded fundamentals, and the MC908AP32ACBE fits breadboard-friendly prototyping because its through-hole 42-pin SDIP package plugs into standard 0.6-inch-wide DIP sockets. The internal 8MHz oscillator means a minimal working system needs only 5V, decoupling, and a monitor-mode entry circuit, letting students focus on GPIO, timers, and serial communication. The 32KB FLASH gives generous room for C-compiled exercises, and free HC08 assembler and C toolchains remain downloadable from community archives. Compared with modern S08 or ARM parts, the HC08's simpler register model makes it an effective stepping stone for learning memory-mapped peripheral programming from first principles.
推薦
推薦產品摘要
工程參考資料，適用於 MC908AP32ACBE — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | MC908AP8ACBE | MC908AP4ACBE | MC908AP16ACBE |
|---|---|---|---|---|
| Package | 42-SDIP (0.600", 15.24mm) | 42-SDIP - same | 42-SDIP - same | 42-SDIP - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Program FLASH | 32 KB | 8 KB | 4 KB | 16 KB |
| Core | HC08 8-bit | HC08 8-bit | HC08 8-bit | HC08 8-bit |
| Max Clock Speed | 8 MHz | 8 MHz | 8 MHz | 8 MHz |
| Oscillator Type | Internal (HS OSC) | Internal (HS OSC) | Internal (HS OSC) | Internal (HS OSC) |
| Number of I/O | 30 | 30 | 30 | 30 |
| Operating Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V |
主要差異化特點
- Largest FLASH density in the through-hole AP family (對比MC908AP8ACBE)
- Cost-reduced option for simple firmware (對比MC908AP16ACBE)
- Crystal-free clocking (對比MC908LJ24CPBER)
設計說明
Do not assume availability from NXP factory channels. The MC908AP32ACBE is a legacy HC08 part supplied mainly through Rochester Electronics and excess distributors; Octopart shows only 2 franchised sources. Before committing a repair or build, confirm stock and lot date codes, and qualify MC908AP8ACBE or MC908AP16ACBE as backup options since the AP family shares the same 42-pin SDIP footprint. Programmed devices containing customer firmware must be ordered pre-programmed, as blank parts require monitor-mode entry tooling.
Design the 5V rail to stay within 4.5V to 5.5V under all load and brownout conditions. In appliance and industrial environments, add bulk capacitance (typically 100uF electrolytic plus 0.1uF ceramic at VDD) to ride through relay-actuation droop, since relay coils sharing the 5V rail commonly cause reset events. Verify the internal oscillator tolerance if using it as a timebase for UART communication; for precise baud rates, follow the HC08 reference manual guidance on external clock options.
For socketed legacy boards, inspect socket contacts during MCU replacement: oxidized dual-wipe sockets are a leading cause of intermittent HC08 failures mimicking firmware faults. Keep the RESET line pulled up per the datasheet recommendation and route it away from relay and motor drive traces, since the HC08 monitor mode enters via RESET and is susceptible to false entry from noise spikes. Place 0.1uF ceramic decoupling within 10mm of the VDD pin per standard HC08 reference designs.
合規資訊
Compliance data was not present in the retrieved distributor listings for this legacy device. As a mature HC08 product originally released before Pb-free transitions, both leaded and lead-free suffix variants may exist; verify with the supplier for the specific date code.
