MC68HC908LJ24CPK - 8MHz 8-bit HC08 MCU, 24KB FLASH, LCD | NXP
N.º da peça: MC68HC908LJ24CPK ✗ Fim de vida| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $8.9 | $8,90 |
| 10 | $7.95 | $79,50 |
| 100 | $6.85 | $685,00 |
| 500 | $5.95 | $2.975,00 |
| 1.000 | $5.2 | $5.200,00 |
MC68HC908LJ24CPK Visão geral
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (FLASH/ROM), data memory (RAM), and peripheral functions such as timers, communication controllers, ADCs, and I/O into one device. The HC08 is an 8-bit CISC core family succeeding the HC05; it executes one byte per instruction cycle and is widely used in appliance control, metering, and human-machine-interface (HMI) boards where low cost and deterministic behavior matter more than raw throughput.
Key features include 24KB FLASH program memory, 768 bytes of RAM, an 8MHz internal bus, integrated LCD driver (typically up to 4x32 segments on this family), an 8-channel 8-bit ADC, two timer/PWM modules, and serial interfaces including SCI and SPI. The on-chip LCD controller removes the need for an external driver chip, simplifying BOM and PCB area in HMI designs.
The MC68HC908LJ24CPK uses the standard HC08 CPU with a 16-bit stack pointer, hardware multiply (MUL) via the accumulator, and the well-documented HC08 instruction set. FLASH memory supports in-system programming through the standard MON08 debug/monitor interface and a serial bootloader mode, enabling field firmware updates without external programming hardware.
Typical applications include white-goods and appliance control panels (washing machines, microwave ovens, dishwashers), HVAC thermostats, metering displays, medical-device HMIs, industrial operator panels, and consumer electronics with segment-LCD displays. The integrated LCD driver is the primary reason designers choose the LJ-variant over the JL-variant.
When designing with this device, plan the VDD/VSS decoupling per HC08 layout guidelines (one 100nF per supply pair, bulk cap near the regulator) and ensure the LCD segment pins are routed away from switching traces to avoid ghost-segment artifacts. Confirm the chosen PJ/PG suffix matches your code size, since FLASH variants with the same die are available in different memory densities.
This page synthesizes distributor stock levels, parametric specifications, and engineering alternatives that go beyond the raw manufacturer datasheet, helping sourcing and design engineers evaluate the part for new designs and for legacy board replacements.
Alternativas drop-in para MC68HC908LJ24CPK — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com MC68HC908LJ24CPK (mesmo formato e footprint) — diferindo em Program Memory Size, Series, Connectivity, Package, RAM Size.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
MC68HC908LJ24CPB
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$5.21 / unidade
Ver ficha técnica →MC68HC908LJ12CPK
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
MC68HC908LJ24CFK
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
MC68HC908LJ24MP
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
MC68HC908LJ24VPK
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
MC68HC908LJ24CPK Classificações máximas e características elétricas
| Core Processor | HC08 |
| Core Size | 8-bit |
| Core Speed | 8 MHz |
| Program Memory Size | 24 KB (24K x 8) |
| Program Memory Type | FLASH |
| RAM Size | 768 B |
| Number of I/O | 48 |
| Supply Voltage (Vcc/Vdd) | 3.0 V to 5.5 V |
| Connectivity | I2C, IRSCI, SPI |
| Peripherals | LCD driver, LVD, POR, PWM |
| Data Converters | A/D 8x8b |
| Encapsulamento | 80-LQFP (LQFP-80, 12x12 mm, surface-mount) |
| Tipo de montagem | Surface Mount |
| Temperatura de operação | -40 C to +85 C (industrial, suffix C) |
| Series | HC08 |
| Oscillator Type | Internal |
Configuração de pinos do MC68HC908LJ24CPK
| Pino 1 | PTA0 — Port A bit 0 (general-purpose I/O, KBI interrupt) |
| Pino 2 | PTA1 — Port A bit 1 (general-purpose I/O) |
| Pino 3 | PTA2 — Port A bit 2 (general-purpose I/O) |
| Pino 4 | PTA3 — Port A bit 3 (general-purpose I/O) |
| Pino 5 | VDD — Positive supply (3.0-5.5 V) |
| Pino 6 | VSS — Ground reference |
| Pino 7 | PTA4 — Port A bit 4 (general-purpose I/O) |
| Pino 8 | PTA5 — Port A bit 5 (general-purpose I/O) |
| Pino 9 | PTA6 — Port A bit 6 (general-purpose I/O) |
| Pino 10 | PTA7 — Port A bit 7 (general-purpose I/O) |
| Pino 11 | PTB0 — Port B bit 0 (general-purpose I/O, ADC input) |
| Pino 12 | PTB1 — Port B bit 1 (general-purpose I/O, ADC input) |
| Pino 13 | PTB2 — Port B bit 2 (general-purpose I/O, ADC input) |
| Pino 14 | PTB3 — Port B bit 3 (general-purpose I/O, ADC input) |
| Pino 15 | PTB4 — Port B bit 4 (general-purpose I/O, ADC input) |
| Pino 16 | PTB5 — Port B bit 5 (general-purpose I/O, ADC input) |
| Pino 17 | PTB6 — Port B bit 6 (general-purpose I/O, ADC input) |
| Pino 18 | PTB7 — Port B bit 7 (general-purpose I/O, ADC input) |
| Pino 19 | PTC0 — Port C bit 0 (general-purpose I/O) |
| Pino 20 | PTC1 — Port C bit 1 (general-purpose I/O) |
| Pino 21 | PTC2 — Port C bit 2 (general-purpose I/O) |
| Pino 22 | PTC3 — Port C bit 3 (general-purpose I/O) |
| Pino 23 | PTC4 — Port C bit 4 (general-purpose I/O) |
| Pino 24 | PTC5 — Port C bit 5 (general-purpose I/O) |
| Pino 25 | PTC6 — Port C bit 6 (general-purpose I/O) |
| Pino 26 | PTC7 — Port C bit 7 (general-purpose I/O) |
| Pino 27 | PTD0 — Port D bit 0 / SPI SCK |
| Pino 28 | PTD1 — Port D bit 1 / SPI MOSI |
| Pino 29 | PTD2 — Port D bit 2 / SPI MISO |
| Pino 30 | PTD3 — Port D bit 3 / SPI SS |
| Pino 31 | PTD4 — Port D bit 4 / TxD SCI |
| Pino 32 | PTD5 — Port D bit 5 / RxD SCI |
| Pino 33 | PTD6 — Port D bit 6 (general-purpose I/O) |
| Pino 34 | PTD7 — Port D bit 7 (general-purpose I/O) |
| Pino 35 | PTE0 — Port E bit 0 (general-purpose I/O) |
| Pino 36 | PTE1 — Port E bit 1 (general-purpose I/O) |
| Pino 37 | PTE2 — Port E bit 2 (general-purpose I/O) |
| Pino 38 | PTE3 — Port E bit 3 (general-purpose I/O) |
| Pino 39 | PTE4 — Port E bit 4 (general-purpose I/O) |
| Pino 40 | PTE5 — Port E bit 5 (general-purpose I/O) |
| Pino 41 | PTE6 — Port E bit 6 (general-purpose I/O) |
| Pino 42 | PTE7 — Port E bit 7 (general-purpose I/O) |
| Pino 43 | PTF0 — Port F bit 0 (LCD segment output) |
| Pino 44 | PTF1 — Port F bit 1 (LCD segment output) |
| Pino 45 | PTF2 — Port F bit 2 (LCD segment output) |
| Pino 46 | PTF3 — Port F bit 3 (LCD segment output) |
| Pino 47 | PTF4 — Port F bit 4 (LCD segment output) |
| Pino 48 | PTF5 — Port F bit 5 (LCD segment output) |
| Pino 49 | PTF6 — Port F bit 6 (LCD segment output) |
| Pino 50 | PTF7 — Port F bit 7 (LCD segment output) |
| Pino 51 | PTG0 — Port G bit 0 (LCD backplane / segment) |
| Pino 52 | PTG1 — Port G bit 1 (LCD backplane / segment) |
| Pino 53 | PTG2 — Port G bit 2 (LCD backplane / segment) |
| Pino 54 | PTG3 — Port G bit 3 (LCD backplane / segment) |
| Pino 55 | PTG4 — Port G bit 4 (LCD backplane / segment) |
| Pino 56 | PTG5 — Port G bit 5 (LCD backplane / segment) |
| Pino 57 | PTG6 — Port G bit 6 (LCD backplane / segment) |
| Pino 58 | PTG7 — Port G bit 7 (LCD backplane / segment) |
| Pino 59 | PTH0 — Port H bit 0 (LCD segment output) |
| Pino 60 | PTH1 — Port H bit 1 (LCD segment output) |
| Pino 61 | PTH2 — Port H bit 2 (LCD segment output) |
| Pino 62 | PTH3 — Port H bit 3 (LCD segment output) |
| Pino 63 | PTH4 — Port H bit 4 (LCD segment output) |
| Pino 64 | PTH5 — Port H bit 5 (LCD segment output) |
| Pino 65 | PTH6 — Port H bit 6 (LCD segment output) |
| Pino 66 | PTH7 — Port H bit 7 (LCD segment output) |
| Pino 67 | PTJ0 — Port J bit 0 (LCD segment output) |
| Pino 68 | PTJ1 — Port J bit 1 (LCD segment output) |
| Pino 69 | PTJ2 — Port J bit 2 (LCD segment output) |
| Pino 70 | PTJ3 — Port J bit 3 (LCD segment output) |
| Pino 71 | PTJ4 — Port J bit 4 (LCD segment output) |
| Pino 72 | PTJ5 — Port J bit 5 (LCD segment output) |
| Pino 73 | PTJ6 — Port J bit 6 (LCD segment output) |
| Pino 74 | PTJ7 — Port J bit 7 (LCD segment output) |
| Pino 75 | OSC1 — Crystal oscillator input / external clock |
| Pino 76 | OSC2 — Crystal oscillator output |
| Pino 77 | RESET — Active-low reset (bidirectional, internal pull-up) |
| Pino 78 | IRQ — External interrupt request (active low) |
| Pino 79 | VREFH — ADC high reference |
| Pino 80 | VREFL — ADC low reference (tied to VSS) |
Aplicações típicas
MC68HC908LJ24CPK é adequado para 6 aplicaçãos: White-Goods Appliance Control, HVAC Thermostat and Climate Control Panels, Industrial Metering and Energy Displays, Medical Device HMI Panels, Consumer Electronics with Segment LCD, Automotive Body and Comfort Electronics.
White-Goods Appliance Control
The MC68HC908LJ24CPK is a workhorse MCU in washing machines, dishwashers, and microwave ovens because it combines a 24KB FLASH (enough for state-machine + UI logic), a 5V-tolerant 3.0-5.5V supply that interfaces directly to triac drivers and mechanical relays, and an on-chip LCD controller that eliminates the external HT1621-class driver. With 48 I/O, the MCU can scan a 4x4 keypad, drive 7-segment or character LCD via integrated segment pins, and PWM-control a motor via the on-chip timer. The 8MHz HC08 core is sufficient for relay-debounce loops and basic PID control without DMA. Its mature MON08 monitor allows factory firmware update on the production line. Industrial designers choose this part for its BOM consolidation advantage in cost-sensitive consumer appliances where every external IC counts.
Recomendado
HVAC Thermostat and Climate Control Panels
The MC68HC908LJ24CPK fits wall-mounted thermostats and climate-control HMI panels because its integrated segment-LCD driver directly displays setpoint temperature, mode, and fan-speed icons without an external driver. The 8-channel 8-bit ADC reads NTC thermistors and humidity sensors, while the two timer/PWM channels generate the variable-speed fan or PWM valve control. The wide 3.0-5.5V supply range lets the MCU run from a rectified 24VAC HVAC bus through a small linear regulator, simplifying the power tree. The HC08's deterministic instruction timing makes scheduling temperature-sampling and button-debounce loops straightforward in C or assembly. With 768 bytes of RAM, calibration tables, hysteresis state, and a small UI buffer all fit comfortably on-chip, removing the need for an external EEPROM.
Recomendado
Industrial Metering and Energy Displays
Electricity meters, water meters, and gas meters frequently use the MC68HC908LJ24CPK because the integrated LCD controller drives the multi-digit segment display that shows kWh consumption, tariff, and diagnostics. The IRSCI peripheral implements an infra-red UART that supports IEC 62056-21 optical probe readout for utility meter reading without mechanical connectors. The 24KB FLASH holds metering firmware including tamper detection, calibration constants, and TOU tariff tables. The 5V-tolerant ADC measures shunt-resistor voltage and Rogowski-coil outputs. Low-power standby is critical for battery-backed or CT-powered meters, and the HC08's STOP/WAIT modes plus the on-chip LVD allow nanoampere-range sleep current while preserving RAM.
Recomendado
Medical Device HMI Panels
The MC68HC908LJ24CPK is used in low-to-mid complexity medical HMIs such as infusion pump keypads, blood-pressure monitor displays, and patient-bedside controllers. The on-chip LCD controller drives the segment display showing pressure, dose, or patient ID; the I2C and SPI peripherals interface to sensor front-ends and to an external Wi-Fi/BLE module for telemetry. The HC08's deterministic interrupt latency is important for safety-critical timing in alarm loops. The 24KB FLASH supports IEC 62304-style firmware structure with self-test routines, and 768 bytes of RAM are enough for a small RTOS-style scheduler. NXP's long-term silicon longevity program keeps the part available for the 10-15 year lifecycle typical of medical devices.
Recomendado
Consumer Electronics with Segment LCD
Audio receivers, kitchen scales, remote-control base stations, and small appliances use the MC68HC908LJ24CPK when they need a custom segment LCD without paying for a TFT controller. The integrated segment LCD handles up to 4 backplanes x 32 segments, enough for 16-digit numeric plus icon displays typical in clock radios and DAB+ tuners. The I2C bus talks to an external audio DAC or EEPROM, while the SPI bus drives an external Flash for logging. The 8MHz core is plenty for IR-decoding, button scanning, and basic audio-level metering. The 5V tolerance lets designers share the main analog supply with the LCD bias, reducing regulator count and BOM cost in competitive consumer markets.
Recomendado
Automotive Body and Comfort Electronics
Within automotive body modules (door modules, climate panels, seat controllers, mirror adjusters) the MC68HC908LJ24CPK provides the 5V-tolerant I/O, integrated LCD, and 24KB FLASH that legacy 12V body-electronics designs require. The HC08 core runs the LIN slave protocol via the SCI peripheral, communicates with mirror position sensors via ADC, and drives mirror motors through PWM. The 48 I/O handle multiple switches (window up/down, lock, mirror select) and LED indicators. AEC-Q100 is NOT qualified on this part - automotive designs that need AEC-Q100 must migrate to NXP's S9S08 or Kinetis KE automotive families, but for non-safety body electronics where OEM cost dominates, the LJ24 remains common.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para MC68HC908LJ24CPK — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | MC68HC908LJ24CPB | MC68HC908LJ12CPK | MC68HC908LJ24CFK | MC68HC908LJ24MP | MC68HC908LJ24VPK |
|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 80-LQFP (PK) 12x12 mm | 84-PQFP | 80-LQFP - same | 80-QFP (PQFP) | 80-LQFP - same | 80-LQFP - same |
| FLASH Program Memory | 24 KB | 24 KB - same | 12 KB (-50%) | 24 KB - same | 24 KB - same | 24 KB - same |
| RAM Size | 768 B | 768 B - same | 768 B - same | 768 B - same | 768 B - same | 768 B - same |
| CPU Speed | 8 MHz | 8 MHz - same | 8 MHz - same | 8 MHz - same | 8 MHz - same | 8 MHz - same |
| LCD Driver | Yes (integrated) | Yes - same | Yes - same | Yes - same | Yes - same | Yes - same |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C - same | -40 C to +85 C - same | -40 C to +85 C - same | -40 C to +125 C (extended) | -40 C to +105 C (extended) |
| Peripherals | LCD, LVD, POR, PWM, ADC 8x8b | Same peripheral set | Same peripheral set | Same peripheral set | Same peripheral set | Same peripheral set |
| Lifecycle Status | NRND | NRND - same | NRND - same | NRND - same | NRND - same | NRND - same |
Principais diferenciais
- Integrated segment LCD driver on-chip (vs MC68HC908JL8CFAE)
- 24KB FLASH vs 12KB mask variants (vs MC68HC908LJ12CPK)
- 80-LQFP package matches modern PCB assembly (vs MC68HC908LJ24CPB)
- 5V-tolerant wide supply range (vs MC68HC908JL8CFAE)
Notas de projeto
Place a 100nF ceramic decoupling capacitor as close as possible to each VDD/VSS pair on the MC68HC908LJ24CPK, with a bulk 4.7-10uF tantalum or ceramic at the regulator. The HC08 core draws short current spikes during FLASH programming and ADC conversion; insufficient decoupling causes FLASH write errors and ADC noise. Keep VREFH bypassed with 100nF to VREFL when the ADC is used - shared VDD reference will couple digital switching noise into analog readings.
The 80-LQFP package dissipates about 1W max in normal 8MHz operation. Estimated: with theta_JA of approximately 50 C/W on a 4-layer JEDEC board and 1W dissipation, junction temperature rises 50 C above ambient - design for Ta max of +70 C to keep Tj under +120 C. For continuously running applications at high ambient, add a copper pour under the LQFP body and thermal vias to the inner plane to drop theta_JA to ~30 C/W.
Route the OSC1/OSC2 traces short and symmetric, with the crystal and load capacitors within 5 mm of the MCU pins. Keep LCD segment traces (PTF/PTH/PTJ) away from switching power and PWM traces, and route them as far from the OSC pins as possible to avoid ghost-segment artifacts. Place the RESET pin pull-up (typically 4.7k) close to the MCU, and add a 1nF cap to ground for noise immunity in appliance environments.
Do not exceed 5.5 V on any pin including during inductive load switching transients - the LJ24 is a 5V part, not 5V-tolerant on top of 3.3V. When migrating from the JL8 to LJ24, confirm FLASH memory map to differ (LJ24 has more flash pages at $EC00-$F7FF region). The MON08 debug interface requires IRQ pin sharing - production boards must isolate the MON08 connector or accept that the IRQ pin cannot be used as a normal interrupt in debug mode.
Informações de conformidade
RoHS and lead-free status not explicitly stated in retrieved distributor data. The 80-LQFP (PK) package typically ships lead-free and RoHS compliant under NXP's lead-free program, but engineers must request the lot-specific compliance certificate from their supplier. Not AEC-Q100 qualified - for automotive body electronics requiring AEC-Q100, migrate to NXP S9S08 or Kinetis KE automotive families.
