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NXP Semiconductors MC908QB4MDWER
- Part No.:
- MC908QB4MDWER
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MC908QB4MDWER.pdf
- Description:
- IC MCU 8BIT 4KB FLASH 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,398
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Product details
Overview
MC908QB4MDWER from NXP Semiconductors (formerly Freescale) is an 8-bit HC08-core microcontroller with 4 KB Flash, 256 B RAM, and integrated 10-bit ADC, designed for cost-sensitive embedded control in industrial and appliance applications requiring high-current I/O, in-application reprogramming, and internal clock oscillator operation up to 3.2 MHz at ±2% typical accuracy.
For engineers reviewing the MC908QB4MDWER datasheet, MC908QB4MDWER pinout, MC908QB4MDWER application, or MC908QB4MDWER equivalent, key selection criteria include its -40°C to +125°C operating range, 16-pin SOIC package, 10-channel ADC with <10 μs conversion time, COP watchdog with autowake-up from stop, and keyboard interrupt-capable GPIO supporting direct LED drive without external drivers.
Technical Context
The MC908QB4MDWER implements the 68HC08 CPU core with object compatibility to 68HC05, supporting 8 MHz bus operation at 5 V (125 ns min instruction cycle) and 4 MHz at 3 V (250 ns min). It integrates second-generation SuperFlash® memory enabling byte-writeable nonvolatile storage with ≥10K write/erase cycles across temperature.
Its analog subsystem includes a 10-bit ADC with up to 10 input channels and sub-10 μs conversion, while timing functions are handled by four independent 16-bit timer channels supporting input capture, output compare, and unbuffered PWM - with channel pairing enabling buffered PWM. The ESCI provides UART and synchronous serial communication with double-buffered TX/RX and optional parity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 68HC08 8-bit CPU, object-compatible with 68HC05, supports multiply/divide and 16 addressing modes |
| Flash Memory | 4 KB SuperFlash®, byte-writable, ≥10K write/erase cycles, used for both program and data EEPROM replacement |
| ADC | 10-bit resolution, up to 10 channels, conversion time <10 μs, enables direct sensor interface without external signal conditioning |
| Timer System | Four 16-bit channels; each configurable as input capture, output compare, or unbuffered PWM; paired channels support buffered PWM |
| Internal Oscillator | 3.2 MHz nominal bus frequency, ±25% trimmable, ±5% accuracy to 125°C, eliminates external crystal/resonator cost and EMI |
| I/O Capability | Up to 13 bidirectional GPIO with high-current drive (direct LED/relay control), programmable pull-ups, and keyboard interrupt support |
| System Protection | COP watchdog timer with autowake-up from stop mode; low-voltage inhibit with selectable trip points for brown-out recovery |
Pinout & Package
MC908QB4MDWER is housed in a 16-pin SOIC package (body width 3.9 mm), rated for -40°C to +125°C operation, with lead finish matte tin and RoHS-compliant construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply | Primary 3–5 V supply rail; powers core, peripherals, and I/O buffers |
| VSS | Ground | Digital ground reference for all internal logic and analog circuitry |
| XTAL | Oscillator input | Accepts external crystal/resonator or RC network; optional when internal oscillator is used |
| EXTAL | Oscillator output | Drives external crystal; forms Pierce oscillator with XTAL when external timing source selected |
| PA0–PA7 | Port A I/O | 8-bit bidirectional port with programmable pull-ups and keyboard interrupt capability; PA0–PA3 support KBI |
| PB0–PB4 | Port B I/O | 5-bit bidirectional port; PB0–PB1 support ESCI TX/RX; PB2–PB4 support SPI SCK/MOSI/MISO |
| RESET | Active-low reset | Asynchronous reset input; asserted by COP timeout, LVI, or external pull-down |
| IRQ | Interrupt request | Edge-triggered external interrupt input; supports wake-from-stop via external event |
Key Features
| Feature | Design Value |
|---|---|
| In-application Flash reprogramming | Enables field firmware updates without removing MCU; 32 μs/byte programming speed reduces production test time |
| Integrated 3.2 MHz internal oscillator | ±2% typical accuracy over full temperature range eliminates need for external clock components and associated board space/EMI |
| High-current I/O with programmable pull-ups | Direct drive of LEDs, relays, and small solenoids; keyboard scan capability removes external glue logic for keypad interfaces |
| 10-bit ADC with 10-channel multiplexer | Sub-10 μs conversion enables real-time sensor sampling (e.g., temperature, voltage, current) without dedicated external ADC |
| COP watchdog with autowake-up from stop | Resets runaway code while allowing periodic wake-up to service sensors or timers-reducing average power in battery-operated systems |
Applications
| Appliance Control | Industrial Sensor Interface |
|---|---|
Use Scenario: Microcontroller-based washing machine control panel with motor sequencing, water level sensing, and user interface. IC Role / Device Role / Timing Role: Main system controller executing real-time motor control loops, reading analog sensor inputs, and managing LED/keypad I/O. Use Value: High-current GPIO drives LEDs and relays directly; 10-bit ADC digitizes pressure/temperature signals; internal oscillator ensures timing stability across wide ambient temperature swings. | Use Scenario: Standalone environmental monitor in HVAC ductwork measuring temperature, humidity, and airflow. IC Role / Device Role / Timing Role: Embedded data acquisition node performing periodic analog sampling, local decision-making, and UART-based reporting. Use Value: COP watchdog maintains reliability during long-term unattended operation; -40°C to +125°C rating supports deployment near hot equipment; ESCI enables robust RS-485 communication. |
| Fluorescent Ballast Control | Home Security Keypad |
Use Scenario: Digital electronic ballast regulating lamp current and implementing end-of-life detection. IC Role / Device Role / Timing Role: Real-time PWM generator controlling MOSFET half-bridge; ADC monitors lamp voltage/current for closed-loop regulation. Use Value: Four 16-bit timer channels provide precise PWM generation and input capture for zero-crossing detection; Flash memory stores lamp calibration data across power cycles. | Use Scenario: Wired security system keypad with 4×4 matrix and status LEDs. IC Role / Device Role / Timing Role: Dedicated keypad controller scanning rows/columns and debouncing keys using hardware-assisted KBI. Use Value: Programmable pull-ups on PA0–PA3 eliminate external resistors; high-current outputs drive status LEDs directly; low-voltage inhibit prevents erratic behavior during brown-out conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC908QB4VDWE | Same 4 KB Flash, 256 B RAM, and peripheral set; rated for -40°C to +105°C instead of +125°C | Suitable for commercial/industrial environments where extended high-temp operation is not required | Select MC908QB4VDWE if ambient operating temperature remains below +105°C to reduce cost while retaining identical functionality |
| MC908QB8MDWE | 8 KB Flash (vs. 4 KB), same RAM, ADC, timers, and package; otherwise functionally identical | Preferred when larger firmware footprint or future feature expansion is anticipated | Choose MC908QB8MDWE when additional Flash capacity is needed for bootloader, OTA updates, or enhanced feature sets |
Compared with MC908QB4VDWE, the MC908QB4MDWER offers extended thermal margin for under-hood or high-power enclosure use; versus MC908QB8MDWE, it trades Flash capacity for lower unit cost and smaller memory footprint-ideal for fixed-function, resource-constrained designs.
Availability
MC908QB4MDWER is available at Aetrix Electronics and suitable for appliance control, industrial sensor nodes, fluorescent ballast systems, and home security keypads requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MC908QB4MDWER includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
NXP Semiconductors is a global semiconductor leader delivering secure, connected, and intelligent solutions for automotive, industrial, IoT, mobile, and communication infrastructure markets.
The MC908QB4MDWER belongs to the HC08 family of 8-bit microcontrollers, engineered for cost-effective, low-power embedded control in thermally demanding environments where Flash flexibility, analog integration, and robust I/O drive capability are essential.
FAQ
What is the maximum operating temperature specification for the MC908QB4MDWER?
The MC908QB4MDWER is rated for operation from -40°C to +125°C. This extended temperature range is validated per its 16-pin SOIC package qualification and supports deployment in high-heat industrial enclosures, automotive under-hood modules, and fluorescent ballast assemblies where ambient temperatures exceed +105°C. The internal oscillator maintains ±5% accuracy across this full range.
Does the MC908QB4MDWER support in-application programming of Flash memory?
Yes, the MC908QB4MDWER supports full in-application Flash programming with no special instructions required. Its SuperFlash® memory allows byte-level writes and erases, enabling runtime data logging, parameter storage, and firmware updates without halting execution. The MC908QB4MDWER achieves programming speeds as fast as 32 μs per byte-up to 100× faster than legacy embedded Flash devices.
Can the MC908QB4MDWER operate without an external crystal or resonator?
Yes, the MC908QB4MDWER includes an integrated 3.2 MHz internal oscillator with ±2% typical accuracy over temperature, eliminating the need for external timing components. External crystal, RC network, or resonator connections remain optional via XTAL/EXTAL pins-providing design flexibility while reducing BOM cost, PCB area, and EMI emissions from external clocks.
How many analog input channels does the ADC in the MC908QB4MDWER support?
The MC908QB4MDWER features a 10-bit successive-approximation ADC with up to 10 single-ended input channels. Channel selection is performed via software-controlled multiplexer, and conversions complete in less than 10 μs. This ADC is directly connected to Port A pins and supports common sensor interfaces including thermistors, potentiometers, and current-sense amplifiers.
What communication interfaces are integrated into the MC908QB4MDWER?
The MC908QB4MDWER integrates two synchronous serial interfaces: an Enhanced Serial Communications Interface (ESCI) supporting UART asynchronous communication with double-buffered TX/RX and optional parity, and a Serial Peripheral Interface (SPI) supporting full-duplex 3-wire transfers at up to 4 MHz bit rate. Both interfaces share GPIO pins on Port B and are fully configurable in software.
MC908QB4MDWER Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Series:
- HC08
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Programmable:
- Verified
- Core Processor:
- HC08
- Core Size:
- 8-Bit
- Speed:
- 8MHz
- Connectivity:
- SCI, SPI
- Peripherals:
- LVD, POR, PWM
- Number of I/O:
- 13
- Program Memory Size:
- 4KB (4K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 128 x 8
- Voltage - Supply (Vcc/Vdd):
- 2.7V ~ 5.5V
- Data Converters:
- A/D 10x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MC908QB4MDWER FAQ
1.How can I place an order for MC908QB4MDWER through Aetrix?
Please submit a Request for Quotation (RFQ) for MC908QB4MDWER on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MC908QB4MDWER reliable?
The price and inventory of MC908QB4MDWER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC908QB4MDWER is usually 5 days.
3.What payment methods are accepted for MC908QB4MDWER?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC908QB4MDWER transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC908QB4MDWER?
MC908QB4MDWER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC908QB4MDWER order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MC908QB4MDWER?
For technical support, including MC908QB4MDWER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC908QB4MDWER requirements.
6.How does Aetrix verify that MC908QB4MDWER is sourced from the original manufacturer or authorized distributors?
All MC908QB4MDWER products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MC908QB4MDWER meets industry standards.
7.What is the process for return or replacement of MC908QB4MDWER?
All MC908QB4MDWER units undergo pre-shipment inspection (PSI). If there is an issue with MC908QB4MDWER, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MC908QB4MDWER part is unused and in its original packaging.
Return procedure for MC908QB4MDWER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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