MC68HC908LJ24CPK-FR 8-Bit 8MHz 24KB Flash MCU | NXP
MPN: MC68HC908LJ24CPK-FR ✗ End of Life| Qty | Unit Price | Extended |
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| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
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| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
MC68HC908LJ24CPK-FR Overview
A microcontroller is a semiconductor that integrates a processor core, memory, and peripherals into one programmable control device. In the system hierarchy, the MC68HC08 belongs to the 8-bit microcontroller family and uses the CPU08 architecture. This places it above general-purpose embedded processors in simplicity and below more powerful 16-bit or 32-bit processors in computational capacity. The MCU executes firmware from Flash and uses its integrated peripherals to read sensors, operate actuators, communicate through serial links, and control embedded equipment.
The verified data establishes a CPU08 8-bit core operating at 8 MHz, 24 KB of 24K x 8 Flash memory, 48 I/O lines, and connectivity including I2C, SPI, and IRSCI. A secondary technical listing identifies LCD, low-voltage detection, power-on reset, and PWM peripherals. These functions reduce the need for external components in cost-sensitive embedded designs while retaining dedicated hardware for common control tasks.
The CPU08 architecture is designed for low-cost, high-performance 8-bit control. Its bus-oriented peripheral integration allows software and hardware modules to share the MCU without requiring a separate external processor for routine control tasks. Flash memory retains programmed firmware without removing the device, while 48 I/O lines provide substantial interface flexibility for switches, displays, sensors, relays, and external logic.
Typical uses include industrial control panels, appliance controllers, building equipment, meter interfaces, keyboard and display systems, low-voltage embedded controllers, and communication-assisted sensor nodes. Peripheral suitability depends on the exact operating conditions and pin requirements, which should be checked against the complete NXP datasheet before design release.
For a new PCB, preserve the verified 80-pin, 12 x 12 mm package geometry and assign programming, reset, clock, ground, communications, LCD, and I/O pins according to the datasheet. For a legacy repair, verify flash contents, clock settings, port states, interrupt configuration, and peripheral pin multiplexing; an electrically similar MCU is not necessarily a functional replacement.
Drop-in alternatives for MC68HC908LJ24CPK-FR — 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 MC68HC908LJ24CPK-FR (same form factor and footprint) — differing in Connectivity, Package, Series.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MC68HC908LJ24CPK
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View Datasheet →MC68HC908LJ24CPK-FR Maximum Ratings & Electrical Characteristics
| Product Type | 8-bit Flash Microcontroller Unit (MCU) |
| Series | M68HC08 / HC08 |
| Processor Core | CPU08, 8-bit |
| Maximum CPU Frequency | 8 MHz |
| Program Memory Size | 24 KB (24K x 8) |
| Program Memory Type | Flash |
| Number of I/O Lines | 48 |
| Package | 80-LQFP, 12 x 12 mm |
| Connectivity | I2C, SPI, IRSCI |
| Integrated Peripherals | LCD, LVD, POR, PWM |
| Core / Instruction Set | CPU08 / HC08 8-bit |
MC68HC908LJ24CPK-FR 80-lqfp, 12 x 12 mm Pin Configuration Guide
Pin configuration for MC68HC908LJ24CPK-FR (80-lqfp, 12 x 12 mm 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 MC68HC908LJ24CPK-FR.
Refer to the datasheet for full pin configuration.
Typical Applications
MC68HC908LJ24CPK-FR is suitable for 6 applications: Industrial Control Panel, Appliance Controller, Meter and Sensor Interface, Human-Machine Interface, Communication-Assisted Sensor Node, Building Equipment Module.
Industrial Control Panel
The MC68HC908LJ24CPK-FR fits a legacy control panel because its 8-bit CPU08 core runs at 8 MHz while 48 I/O lines can support keys, indicators, interlocks, and discrete sensors. Its listed LCD, PWM, I2C, SPI, and IRSCI functions can coordinate displays, actuator timing, and external controllers without a separate processor for routine tasks. The MCU is most practical when maintaining an HC08 code base and pin assignment already exists. Before deployment, verify the package pinout, operating limits, isolation boundaries, watchdog behavior, and lifecycle risk because these items are not confirmed in the supplied excerpts.
Recommended
Appliance Controller
For an appliance controller, the target's 24 KB of Flash supports compact embedded firmware, while 48 I/O lines can organize user inputs, motor-control signals, display indications, and safety-related discrete interfaces. The listed PWM peripheral is useful for periodic actuator timing, and I2C or SPI can connect sensors or driver ICs. Unlike a high-performance MCU, the 8 MHz CPU08 core is aimed at deterministic supervisory tasks rather than graphics or intensive control mathematics. Legacy compatibility and supply continuity should be weighed carefully because the supplied technical listing identifies this family member as obsolete.
Recommended
Meter and Sensor Interface
The MC68HC908LJ24CPK-FR can serve as a legacy measurement-interface controller because its 48 I/O lines provide ample discrete connectivity and its listed I2C and SPI interfaces suit common sensors, analog converters, and memory devices. An 8 MHz CPU08 core can format readings, apply calibration, debounce inputs, and report status over IRSCI or another configured serial path. Designers must budget execution time between sampling and communication and avoid assuming current-generation high-speed ADC performance, which is not confirmed here. Exact converter connections, voltage levels, grounding, and acquisition timing must follow the complete datasheet and application requirements.
Recommended
Human-Machine Interface
The integrated LCD capability and 48 I/O lines make the MC68HC908LJ24CPK-FR relevant to a simple legacy human-machine interface. It can scan keys, update a character or segment display, indicate operating states, and communicate with a host over the listed IRSCI interface while leaving I/O lines available for external logic. The target's 8 MHz CPU08 core is sufficient for conventional menu and status tasks, but display timing, contrast, and power consumption depend on the exact LCD configuration and external circuitry. Pin multiplexing must be checked because panel signals, communications, and general I/O share a limited 80-pin resource set.
Recommended
Communication-Assisted Sensor Node
For a wired sensor node, the MC68HC908LJ24CPK-FR can acquire discrete sensor inputs, manage I2C or SPI devices, run control logic from 24 KB of Flash, and report data through IRSCI. Its integrated low-voltage detection, power-on reset, and PWM functions can support dependable startup and periodic system behavior without requiring every function to be implemented externally. The same 8 MHz 8-bit core must be assessed against the complete sensor and communications workload, including update latency and serial-buffer demand. Since this is a legacy MCU, secure sourcing and long-term software maintenance are central selection concerns.
Recommended
Building Equipment Module
The target can suit a legacy building-equipment module that coordinates switches, indicators, alarm outputs, and local sensor interfaces. Its 48 I/O lines support distributed discrete connections, while PWM handles repetitive timing tasks and I2C or SPI can connect remote sensing or identification devices. The CPU08 processor is appropriate for fixed control sequences, status retention, and low-cost peripheral supervision. A production implementation still needs verified voltage and temperature limits, surge protection, fail-safe behavior, and lifecycle planning. Those requirements may favor a supported MCU family if the equipment has a long certification or service life.
Recommended
Recommended Products Summary
Engineering reference data for MC68HC908LJ24CPK-FR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC68HC908LJ24CPK |
|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors |
| Package | 80-LQFP (12x12) | 80-FQFP (12x12) |
| Processor Core | CPU08, 8-bit | CPU08, 8-bit |
| Maximum CPU Frequency | 8 MHz | 8 MHz |
| Program Memory | 24 KB Flash | 24 KB Flash |
Key Differentiators
- Verified target identity uses the -FR ordering suffix (vs MC68HC908LJ24CPK)
- Defined legacy control resource set (vs MC68HC908JL8MFAE)
- Integrated human-interface and communication functions (vs MC68HC908LJ24CPK)
Design Notes
Do not treat a similar MC68HC908 MPN as a drop-in part without comparing every package connection. The verified records distinguish MC68HC908LJ24CPK-FR from MC68HC908LJ24CPK and describe 80-LQFP versus 80-FQFP. Verify the physical lead geometry, all 80 pin assignments, suffix meaning, temperature grade, and purchasing configuration. Also preserve the exact clock, interrupt-vector, timer, LCD, and communication configuration because matching headline CPU and Flash specifications does not guarantee software or board compatibility.
Route sensitive serial interfaces away from switching nodes and provide the required pull-up, isolation, and signal-conditioning components in the board design. The MCU supports I2C, SPI, and IRSCI according to the verified technical listing, but each interface still needs pin multiplexing and voltage-level verification. Confirm external bus capacitance and line loading against official timing limits. Decouple each supply connection locally, follow the package footprint exactly, and do not infer package drawings from the family description alone.
Operating-voltage and temperature limits are not present in the verified excerpts, so they must be obtained from the official NXP family datasheet before power-supply and enclosure design. Check every supply pin, decoupling requirement, I/O injection limit, and brownout behavior applicable to power-on reset and low-voltage detection. Estimated: power dissipation equals the sum of each active rail's voltage times its current; the actual operating-point calculation requires verified rail voltages and currents and should not be treated as a datasheet rating.
Compliance Information
No verified RoHS, REACH, halogen-free, lead-free, conflict-mineral, or automotive qualification statement was supplied. AEC-Q100 is not applicable based solely on the fact that this is a general-purpose microcontroller.
