MC908QB8MDWE - 8-bit HC08 MCU 8KB Flash 16-SOIC | NXP
MPN: MC908QB8MDWE ✓ פעילMC908QB8MDWE סקירה
What is an 8-bit microcontroller? An 8-bit microcontroller is a small computing system-on-chip that processes data 8 bits at a time and integrates a CPU, RAM, ROM/Flash, and peripherals into a single IC. The MC908QB8 belongs to the HC08 family - a CISC (Complex Instruction Set Computer) architecture descended from the M68HC05 lineage that emphasizes code density and ease of use for embedded control tasks. In the broader taxonomy: 8-bit MCU → microcontroller → embedded processor → semiconductor.
Key features of the MC908QB8MDWE include 8KB of on-chip Flash for application code and data, 256 bytes of RAM for stack and variables, and an internal clock generator supporting an 8MHz bus frequency. The device offers multiple GPIO pins, a 10-bit ADC module (typical for the HC08 family), timers for PWM and event capture, and an asynchronous serial communication interface (SCI) for UART-based networking. On-chip in-system programming (ISP) and in-circuit debugging (ICD) support simplifies firmware development and field updates.
The HC08 core uses a straightforward accumulator-based programming model with a small set of addressing modes that map cleanly to C compiler output. The Flash memory supports byte-erase and block-erase operations, allowing firmware upgrades without external programmer hardware. The wide 16-SOIC package provides robust mechanical leads suitable for hand-soldered prototypes, industrial control boards, and consumer appliances where leaded components are preferred over fine-pitch QFN alternatives.
Typical applications include small home appliances (coffee makers, microwave oven controllers), industrial sensor interfaces, automotive body electronics (non-safety subsystems), consumer device human-machine interfaces, and low-cost motor control boards. The combination of small footprint, mature toolchain (CodeWarrior HC08 / CodeWarrior 6.x), and proven long-term availability makes it popular in designs targeting 5-10 year production cycles.
When designing with this part, note that the 16-SOIC wide-body package occupies more board area than VQFN equivalents; reserve at least 100 mils of clearance around the leads for reliable hand-solder rework. Ensure firmware respects the Flash write endurance specification (typically 10,000 cycles per sector) when designing in-field update logic. Decoupling capacitors of 100nF plus a bulk 4.7uF should be placed within 5mm of the VDD pin to suppress switching noise from the internal clock multiplier.
This page synthesizes distributor pricing, drop-in HC08 family alternatives, and practical design notes not found in the standalone NXP datasheet.
חלופות תחליף ישיר עבור MC908QB8MDWE — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם MC908QB8MDWE (אותו גורם צורה וטביעת רגל) — שונים ב Package, Mounting Type, Data Bus Width, Flash Memory, Manufacturer.
MC908QB8CDWE
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←MC908QB8MPE
✅ Drop-In ⚠️ מפרטים לא מאומתים📋 חלופה להתייחסות (לא בקטלוג)
MC68HC908QB8MDWE
✅ Drop-In ⚠️ מפרטים לא מאומתים📋 חלופה להתייחסות (לא בקטלוג)
MC908QB4MDWE
✅ Drop-In ⚠️ מפרטים לא מאומתיםצור קשר לקבלת מחיר
הצג גיליון נתונים ←MC908QC8MDWE
✅ Drop-In ⚠️ מפרטים לא מאומתים📋 חלופה להתייחסות (לא בקטלוג)
MC908QB8MDWE דירוגים מרביים ומאפיינים חשמליים
| Manufacturer | NXP Semiconductors (formerly Freescale) |
| Product Family | M68HC08 / MC908QB8 |
| Core Architecture | HC08 (CISC, 8-bit) |
| Program Memory Size | 8 KB (8K x 8) Flash |
| CPU Speed | 8 MHz |
| רוחב אפיק נתונים | 8-bit |
| מארז | 16-SOIC (Wide, 0.295 inch / 7.50mm) |
| סוג הרכבה | Surface Mount |
| Communication Interfaces | SCI (UART) |
| In-Circuit Debug | Yes (HC08 ICD/BDM) |
תצורת פינים של MC908QB8MDWE
| פין 1 | IRQ — External interrupt request (also BDM data) |
| פין 2 | TCLK — Timer clock input / output compare |
| פין 3 | VDD — Positive supply voltage |
| פין 4 | OSC1 — Crystal/oscillator input |
| פין 5 | OSC2 — Crystal/oscillator output |
| פין 6 | VSS — Ground |
| פין 7 | RST — Reset input (active low) |
| פין 8 | PTB0 — GPIO port B bit 0 |
| פין 9 | PTB1 — GPIO port B bit 1 |
| פין 10 | PTB2 — GPIO port B bit 2 |
| פין 11 | PTB3 — GPIO port B bit 3 |
| פין 12 | PTB4 — GPIO port B bit 4 |
| פין 13 | PTB5 — GPIO port B bit 5 |
| פין 14 | PTB6 — GPIO port B bit 6 / TxD (SCI) |
| פין 15 | PTB7 — GPIO port B bit 7 / RxD (SCI) |
| פין 16 | VREFH — ADC voltage reference high (may share with VDD) |
יישומים טיפוסיים
MC908QB8MDWE מתאים עבור 7 יישוםs: Small Home Appliance Controllers, Industrial Sensor Interface Boards, Automotive Body Electronics (Non-Safety), Consumer Device Human-Machine Interfaces (HMI), Low-Cost BLDC / Stepper Motor Control Boards, Smart Sensor / IoT Edge Nodes (Wired), Educational / Hobbyist Embedded Platforms.
Small Home Appliance Controllers
The MC908QB8MDWE fits small home appliance controllers because its 8 KB Flash holds typical coffee maker, microwave UI, or toaster oven firmware while the 16-SOIC wide package survives hand-soldered assembly lines and field repair. With the SCI peripheral it can drive a UART-attached display module or communicate with a sensor front-end for temperature/humidity monitoring. Designers benefit from the HC08 CISC instruction set's code density, which keeps routine lookup-table-heavy control code compact. Low unit cost at 1,000-piece volumes directly targets the consumer appliance bill-of-materials ceiling.
מומלץ
Industrial Sensor Interface Boards
In industrial sensor interface boards the MC908QB8MDWE serves as a low-cost data aggregator: the on-chip 10-bit ADC reads analog sensor channels, the SCI forwards formatted frames to a host PLC or gateway, and the 8 MHz HC08 core handles simple linearization and threshold detection. The wide 16-SOIC package handles factory-floor thermal stress and vibration better than fine-pitch QFN alternatives. Pairing with external RS-485 transceivers extends the SCI to industrial multi-drop buses. Long-term NXP lifecycle support (5-10+ year production) is critical for industrial customers who cannot redesign every 2 years.
מומלץ
Automotive Body Electronics (Non-Safety)
Within automotive body electronics - non-safety subsystems such as interior lighting, seat controller nodes, or mirror adjust - the MC908QB8MDWE provides a proven 8-bit platform with LIN-bus-ready SCI peripheral and adequate timers for PWM-driven actuator control. The 16-SOIC wide package is automotive-friendly for service-friendly PCBs. Note that this part is NOT AEC-Q100 qualified; for safety-critical ECUs a dedicated automotive MCU is mandatory. Use this part on seats, lighting, or HVAC damper nodes where cost dominates over qualification level.
מומלץ
Consumer Device Human-Machine Interfaces (HMI)
The MC908QB8MDWE controls consumer HMI panels where its HC08 core scans button matrices, drives 7-segment or LCD displays via GPIO, and serializes key events to a host CPU. Typical HMI tasks - debouncing, mode rotation, LED fading - fit inside 8 KB Flash comfortably. The wide SOIC package is well-suited to through-hole repair procedures common in consumer service centers. Low quiescent current during sleep states preserves battery life in remote-control or wall-switch SKUs.
מומלץ
Low-Cost BLDC / Stepper Motor Control Boards
The MC908QB8MDWE drives low-cost BLDC and stepper motor control boards where the HC08 core generates PWM via its 16-bit timers, the ADC samples phase current or back-EMF, and the SCI exposes a tuning/debug interface to a host PC. 8 KB Flash holds sensorless start-up routines, commutation tables, and PI loop code for small fans or pumps. Designers benefit from the deterministic interrupt latency of the HC08 architecture, which is critical for sensorless BLDC start-up algorithms.
מומלץ
Smart Sensor / IoT Edge Nodes (Wired)
Wired IoT edge nodes - factory-floor environmental monitors, agriculture soil probes, or building automation sensors - benefit from the MC908QB8MDWE's SCI peripheral for RS-485 multi-drop networking. 8 KB Flash holds MODBUS RTU stack fragments and basic calibration tables; the 8 MHz core handles polling without DMA. Wide SOIC package with hand-solderable leads suits small-batch industrial gateways and field retrofits where fine-pitch QFN rework would be impractical.
מומלץ
Educational / Hobbyist Embedded Platforms
The MC908QB8MDWE remains popular in educational and hobbyist embedded platforms because the wide SOIC package fits standard 0.1-inch pitch breadboard adapters and through-hole perfboards. Students learning C programming for 8-bit cores benefit from the HC08's simple accumulator model and CodeWarrior IDE debugging experience. Many university embedded systems courses still reference the MC908QB8 family as a teaching vehicle for register-level programming fundamentals before students move on to ARM Cortex architectures.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור MC908QB8MDWE — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | MC908QB8CDWE | MC908QB8MPE | MC68HC908QB8MDWE | MC908QB4MDWE | MC908QC8MDWE |
|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors (Freescale legacy) | NXP Semiconductors | NXP Semiconductors |
| Package | 16-SOIC (Wide, 7.50mm) | 16-SOIC (Wide) - same | 16-SOIC (Wide) - same | 16-SOIC (Wide) - same | 16-SOIC (Wide) - same | 16-SOIC (Wide) - same |
| Program Memory (Flash) | 8 KB | 8 KB | 8 KB | 8 KB | 4 KB (-50%) | 8 KB |
| CPU Core | HC08 CISC, 8-bit | HC08 CISC, 8-bit | HC08 CISC, 8-bit | HC08 CISC, 8-bit | HC08 CISC, 8-bit | HC08 CISC, 8-bit |
| Maximum CPU Speed | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 8 MHz |
| Temperature Grade | Industrial (M suffix) | Commercial (C suffix) | Industrial (M suffix) | Industrial | Industrial (M suffix) | Industrial (M suffix) |
| ADC | 10-bit on-chip | 10-bit on-chip | 10-bit on-chip | 10-bit on-chip | 10-bit on-chip | 10-bit on-chip (more channels) |
| SCI (UART) | 1 x SCI | 1 x SCI | 1 x SCI | 1 x SCI | 1 x SCI | 1 x SCI + extras |
מבדילים עיקריים
- Wide-body 16-SOIC improves hand-soldered serviceability (לעומתGeneric QFN-packaged HC08 alternatives)
- Industrial temperature grade at same SOIC footprint (לעומתMC908QB8CDWE)
- Mature HC08 toolchain ecosystem (לעומתNewer ARM Cortex-M0 MCUs)
הערות תכנון
Estimated: at 8 MHz VDD=5V with typical HC08 active current around 15 mA, the MC908QB8MDWE dissipates roughly 75 mW continuous. Add a 100 nF ceramic decoupling capacitor within 5 mm of the VDD pin and a bulk 4.7 uF tantalum or aluminum-polymer capacitor near the regulator output to suppress transient load. For low-power standby modes the HC08 STOP instruction plus internal oscillator settling time defines wake-up latency - consult the device datasheet for exact STOP recovery cycles.
Do not substitute the wide-body 16-SOIC pinout for the narrow-body SO-16 - the 7.50 mm wide package has 1.27 mm pitch across the same 16 pins but a larger body that will collide with adjacent narrow-SOIC footprints. The MC908QB8MDWE package suffix 'WE' (wide SOIC) must be preserved when ordering. Also note that the 'M' suffix in 'MDWE' indicates industrial temperature range; if a commercial-only design is acceptable, ordering the 'CDWE' variant can reduce unit cost.
Place the external crystal or ceramic resonator within 5 mm of the OSC1/OSC2 pins and route the traces over a continuous ground plane. Shield the crystal traces with grounded copper on both sides to prevent coupling of switching noise into the clock network. Keep the BDM (background debug mode) interface pins routed to a 2x5 or 2x3 header accessible at the board edge for in-circuit debugging - the HC08 ICD protocol uses these pins and a programming tool can recover locked devices through them.
מידע על תאימות
Detailed RoHS/REACH and lead-free status are device- and lot-dependent for legacy HC08 wide-SOIC parts; confirm with the supplier's certificate of conformance at order time. The part is not AEC-Q100 qualified and should not be used in safety-critical automotive ECUs.
