MC908AP32ACBE - 8-bit HC08 MCU 32KB Flash 8MHz | NXP
MPN: MC908AP32ACBE ✗ End of Life| Qty | Unit Price | Extended |
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| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
MC908AP32ACBE Overview
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.
Drop-in alternatives for MC908AP32ACBE — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with MC908AP32ACBE (same form factor and footprint) — differing in Package, Program Memory Size, Mounting Type, Core, Supply Voltage.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MC908AP8ACBE
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$7.15 / Unit
View Datasheet →MC908AP4ACBE
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MC908AP16ACBE
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$5.4 / Unit
View Datasheet →MC908AP64
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MC908AP32ACBE Maximum Ratings & Electrical Characteristics
| 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 |
| Package / Case | 42-SDIP (0.600", 15.24mm) |
| Mounting Type | 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 Pin Configuration Guide
Pin configuration for MC908AP32ACBE (42-pdip 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 MC908AP32ACBE.
Refer to the datasheet for full pin configuration.
Typical Applications
MC908AP32ACBE is suitable for 6 applications: 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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
Recommended Products Summary
Engineering reference data for MC908AP32ACBE — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | 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 |
Key Differentiators
- Largest FLASH density in the through-hole AP family (vs MC908AP8ACBE)
- Cost-reduced option for simple firmware (vs MC908AP16ACBE)
- Crystal-free clocking (vs MC908LJ24CPBER)
Design Notes
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.
Compliance Information
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.
