MC908QT4ACDWE - 8-bit HC08 MCU 4KB Flash 8MHz SOIC-8 | NXP
N.º de pieza: MC908QT4ACDWE ✗ Fin de vida| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $3.42 | $3,42 |
| 10 | $3.07 | $30,70 |
| 100 | $2.71 | $271,00 |
| 500 | $2.38 | $1.190,00 |
| 1.000 | $2.05 | $2.050,00 |
MC908QT4ACDWE Descripción general
An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data path. It typically integrates a CPU core, non-volatile program memory (Flash or ROM), volatile working memory (RAM), one or more timers, general-purpose I/O, and a selection of analog and digital peripherals. Within the broader taxonomy, an MCU is a member of the microcontroller family, which itself belongs to embedded processors, which fall under the larger category of microcontrollers and microprocessors, ultimately classified as integrated circuits and semiconductors. The HC08 family from NXP is a long-established CISC 8-bit architecture valued for its compact instruction set, deterministic behavior, and very low active and standby current, making it well suited to battery-powered and always-on designs.
Key features include 4 KB (4K x 8) of flash program memory, 128 bytes of RAM, an internal clock generator with optional external crystal support, an 8-bit successive-approximation analog-to-digital converter with up to 8 input channels, a 16-bit timer with capture/compare/PWM, and an asynchronous serial communications interface (SCI). The HC08QT sub-series is the smallest pin-count derivative of the HC08 family, optimizing the die for space-constrained applications.
The MC908QT4ACDWE uses the M68HC08 CPU core with a von Neumann-style address and data bus architecture. Its peripherals are clock-gated so unused modules add nothing to quiescent current, while an on-chip voltage regulator keeps the core logic supply stable across the 3 V to 5.5 V operating range. The integrated analog-to-digital converter performs conversions in approximately 17 ADC clock cycles, giving a typical conversion time near 17 microseconds at the maximum 1 MHz ADC bus clock.
Typical applications include low-cost consumer appliances, white goods user interfaces, battery-powered sensors, simple motor or solenoid control, and small IoT edge nodes. In each case the combination of flash memory, on-chip ADC, and integrated timers reduces the bill of materials while retaining firmware flexibility.
When designing with this part, place a 100 nF decoupling capacitor as close as possible to the VDD pin, ensure the reset pin is held low until the supply has stabilized, and verify that the chosen crystal or resonator meets the HC08 oscillator's load-capacitance requirements.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that go beyond the manufacturer datasheet.
Alternativas directas para MC908QT4ACDWE — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con MC908QT4ACDWE (mismo factor de forma y huella) — difiere en Package, ADC, RAM Size, Number of I/O Pins, RoHS Status.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
MC908QT4ACDWER
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MC908QT4AMDWE
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MC908QY4ACDWE
✅ Sustitución directa✓ En stock
$4.3345 / unidad
Ver hoja de datos →MCHC908QT4MDWE
✅ Sustitución directa✓ En stock
$1.65 / unidad
Ver hoja de datos →MC908QT2ACDWE
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MC908QT4ACDWE Valores máximos y características eléctricas
| Core | M68HC08 (HC08 CISC) |
| Ancho del bus de datos | 8 bit |
| Program Memory Size | 4 KB (4K x 8) Flash |
| RAM Size | 128 B |
| Maximum CPU Clock Frequency | 8 MHz |
| Supply Voltage Range | 3 V to 5.5 V |
| Rango de temperatura de funcionamiento | -40 C to +85 C |
| ADC | 8-bit, up to 8 channels |
| Timer | 16-bit with capture/compare/PWM |
| Communication Interface | SCI (UART) |
| Number of I/O Pins | 6 |
| Encapsulado | 8-SOIC (DWE) |
| Tipo de montaje | Surface Mount |
| Low-Power Modes | STOP and WAIT |
| Estado RoHS | Compliant |
| Lead-Free | Yes |
Configuración de pines de MC908QT4ACDWE
| Pin 1 | PTA0/ADP0 — Port A bit 0 / ADC channel 0 |
| Pin 2 | PTA1/ADP1 — Port A bit 1 / ADC channel 1 |
| Pin 3 | VSS — Ground |
| Pin 4 | PTA2/ADP2 — Port A bit 2 / ADC channel 2 |
| Pin 5 | PTA3/ADP3 — Port A bit 3 / ADC channel 3 |
| Pin 6 | PTA4/RESET — Port A bit 4 / active-low reset |
| Pin 7 | PTA5/OSC1 — Port A bit 5 / oscillator input |
| Pin 8 | VDD — Positive supply (3.0 V to 5.5 V) |
Aplicaciones típicas
MC908QT4ACDWE es adecuado para 6 aplicacións: Battery-Powered Wireless Sensor Nodes, Consumer Appliance User-Interface Boards, Low-Cost Motor and Solenoid Drivers, Smart Home Sensor Edge Nodes, Industrial Control Replacement Boards, Educational and Hobbyist Embedded Projects.
Battery-Powered Wireless Sensor Nodes
The MC908QT4ACDWE fits battery-powered wireless sensor nodes because its HC08QT core draws only a few milliamps in active mode and microamps in STOP mode, while the integrated 8-bit ADC samples sensor outputs without an external converter. With 4 KB of flash, designers can store a small protocol stack and periodic-sampling firmware, and the 16-bit timer keeps wake-up intervals accurate across the 3.0 V to 5.5 V supply range. Compared with larger Cortex-M0 parts, the 8-SOIC DWE footprint keeps the PCB below one square centimeter and trims bill-of-materials cost, which matters in volume-priced sensor products.
Recomendado
Consumer Appliance User-Interface Boards
White-goods and small-appliance user-interface boards benefit from the MC908QT4ACDWE's 8-pin SOIC footprint, on-chip 8-bit ADC for keypad or temperature sensing, and 16-bit timer for buzzer or LED drive PWM. The 4 KB flash holds lookup tables and mode logic for things like microwave keypads, washing-machine knob inputs, or rice-cooker thermostats. With only six usable I/O pins, the device fits the minimal pin count that many single-function user-interface boards need, avoiding the cost of larger 20- or 32-pin MCU derivatives. Supply tolerance down to 3.0 V lets the board share a regulator with the rest of the appliance.
Recomendado
Low-Cost Motor and Solenoid Drivers
Low-cost brushed DC motor and solenoid driver boards use the MC908QT4ACDWE because its 16-bit timer module provides hardware PWM and input capture, eliminating the need for an external timer IC. The 8-bit ADC senses current via a shunt resistor for basic closed-loop control, while 4 KB of flash is enough for startup ramps and fault-recovery state machines. The 8-MHz CPU clock is more than adequate for 1 kHz PWM update rates with headroom for housekeeping. Designers gain an 8-pin SOIC footprint that drives a single half-bridge MOSFET directly and shares supply with a 5 V or 3.3 V logic rail.
Recomendado
Smart Home Sensor Edge Nodes
Smart-home edge nodes for temperature, humidity, contact, or PIR sensors fit naturally on the MC908QT4ACDWE. The 8-bit ADC handles analog sensor interfaces, the integrated SCI block communicates with an upstream radio module, and 4 KB of flash is sufficient for calibration tables and transmit scheduling. The HC08QT STOP mode keeps quiescent current in the microamp range, so a coin-cell node can run for years on a single battery. The 8-SOIC (DWE) package fits inside a CR2032-sized sensor puck, which is exactly the form factor mainstream smart-home sensors demand.
Recomendado
Industrial Control Replacement Boards
Industrial machine builders and maintenance teams need a drop-in MCU for legacy control boards that are now out of production. The MC908QT4ACDWE preserves the original pinout, 4 KB flash footprint, and 8-bit ADC behavior of the HC08QT family, so field-replacement boards can be designed around the exact same PCB. Operating from 3.0 V to 5.5 V and -40 C to +85 C, the device handles factory-floor temperatures. Stocking the same NXP part also simplifies firmware version control for long-life industrial equipment.
Recomendado
Educational and Hobbyist Embedded Projects
Hobbyists and university embedded-systems courses use the MC908QT4ACDWE as an 8-bit teaching platform because it exposes the HC08 core in an easy-to-handle 8-SOIC package with only six I/O pins, a single timer, and a single ADC. Students can write programs in assembly or C, flash them via the on-chip serial monitor, and observe registers without an RTOS. The 4 KB flash and 128-byte RAM are enough for blinking LEDs, keypad decoders, and basic PID loops, and the wide 3.0 V to 5.5 V supply tolerance lets the board run from a USB or bench supply. Cost-sensitive hobby kits benefit from the part's sub-$3 unit price.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para MC908QT4ACDWE — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | MC908QT4ACDWER | MC908QT4AMDWE | MC908QY4ACDWE | MCHC908QT4MDWE | MC908QT2ACDWE |
|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 8-SOIC (DWE) | 8-SOIC (DWE) - same | 8-SOIC (DWE) - same | 8-SOIC (DWE) - same | 8-SOIC (DWE) - same | 8-SOIC (DWE) - same |
| Program Memory | 4 KB Flash | 4 KB Flash | 4 KB Flash | 4 KB Flash | 4 KB (mask ROM option) | 2 KB Flash |
| Maximum CPU Clock | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 8 MHz |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +125 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| ADC | 8-bit, up to 8 channels | 8-bit, up to 8 channels | 8-bit, up to 8 channels | 8-bit, up to 8 channels | 8-bit, up to 8 channels | 8-bit, up to 8 channels |
| Memory Type | Flash (user programmable) | Flash (user programmable) | Flash (user programmable) | Flash (user programmable) | Mask ROM / factory programmed | Flash (user programmable) |
| Packaging Form | Tube | Tape and Reel | Tube | Tube | Tube | Tube |
Diferenciadores clave
- User-programmable flash with on-chip monitor (frente a MCHC908QT4MDWE)
- 4 KB flash rather than 2 KB (frente a MC908QT2ACDWE)
- Standard -40 C to +85 C operating range vs extended grade (frente a MC908QT4AMDWE)
Notas de diseño
Place a 100 nF decoupling capacitor as close as possible to the VDD pin (pin 8) and a bulk capacitor of at least 1 uF on the same supply rail. The on-chip voltage regulator generates the core logic supply internally; bypass its output if the datasheet recommends an external capacitor. Verified against the HC908QT4A family datasheet, which specifies a 3.0 V to 5.5 V single-rail operation, so a single low-dropout regulator from a USB or 9 V adapter is sufficient.
The PTA4/RESET pin is open-drain by default. When using the internal pull-up option, do not also pull the line low through an external resistor divider that exceeds the datasheet's maximum pull-down current. Hold RESET low until VDD has reached its stable working range to avoid lock-up states. Estimated: based on the HC08 reset block diagram in the HC908QT4A datasheet; exact timing depends on the chosen supervisor capacitor value.
Keep the trace from the oscillator input (PTA5/OSC1) shorter than 5 mm and shield it with a ground pour to reduce noise injection. The HC08QT oscillator is sensitive to load capacitance; if a crystal is used, place the load capacitors within 3 mm of the OSC1 pin. For noise-sensitive analog inputs, route the ADC traces away from switching nodes and add a small RC filter on each ADP input for clean 8-bit readings.
Información de cumplimiento
RoHS and REACH compliance confirmed via distributor product pages. AEC-Q100 qualification is not claimed for the standard 8-SOIC variant; the MC908QT4AMDWE may offer different qualification status and should be evaluated separately for AEC-Q100 needs.
