MC908MR16CBE - 8-bit HC08MR MCU, 16KB Flash, 56-SDIP | NXP
MPN: MC908MR16CBE ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.85 | $7.85 |
| 10 | $7.1 | $71.00 |
| 100 | $6.35 | $635.00 |
| 500 | $5.7 | $2,850.00 |
| 1,000 | $5.05 | $5,050.00 |
MC908MR16CBE Overview
An 8-bit microcontroller (MCU) is a single-chip processor that integrates a CPU core, program memory (FLASH/ROM), data memory (RAM), and peripheral set into one device, executing one instruction per cycle from internal memory. The HC08MR belongs to the M68HC08 family hierarchy: M68HC08 family -> HC08 core -> HC08MR sub-family -> MC908MR16 device. Compared with 16- or 32-bit MCUs, an 8-bit HC08 device is selected when BOM cost, deterministic interrupt latency, and simple peripheral integration outweigh raw compute throughput.
Key features of the MC908MR16CBE include 16KB (16K x 8) FLASH for application code, 8 MHz maximum bus frequency, HC08MR-class timer/PWM peripherals for three-phase brushless DC or stepper motor control, an industrial operating temperature range suitable for factory-floor deployment, and a 56-SDIP package providing robust through-hole solder joints for high-vibration industrial environments. The device is part of the legacy HC908 portfolio originally developed by Freescale Semiconductor and now stewarded by NXP Semiconductors.
Architecturally, the HC08 core uses a von-Neumann memory map with a single address space shared by FLASH, RAM and registers. The HC08MR sub-family augments this with a motor-control-oriented timer, multiple PWM outputs, and analog inputs tailored for back-EMF sensing and current feedback.
Typical applications include low-cost BLDC and PMSM motor drives, appliance control boards (washing machines, dishwashers, fans), HVAC damper and blower controllers, and industrial stepper indexers. When laying out the PCB, route the SDIP through-hole pads on a 1.778 mm pitch and place the decoupling 100 nF ceramic within 5 mm of the VDD pins. Verify erase/write endurance (typically 10k cycles) before committing to in-field firmware-update use cases.
Drop-in alternatives for MC908MR16CBE — 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 MC908MR16CBE (same form factor and footprint) — differing in Program Memory Size, Maximum Clock Frequency, Core, Mounting Type, Number of Pins.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MC908MR32CBE
✅ Drop-In✓ In Stock
$7.25 / Unit
View Datasheet →MC908MR16CFUE
✅ Drop-In✓ In Stock
$4.48 / Unit
View Datasheet →MC908MR16CBE Maximum Ratings & Electrical Characteristics
| Core | HC08 (M68HC08 family, HC08MR sub-family) |
| Data Bus Width | 8 bit |
| Maximum Clock Frequency | 8 MHz |
| Program Memory Size | 16 KB (16K x 8) FLASH |
| Program Memory Type | FLASH |
| Package | 56-SDIP (Skinny DIP, 0.600 inch / 15.24 mm) |
| Mounting Type | Through-Hole |
| Number of Pins | 56 |
| Series | HC908MR16 / MC908MR16 |
| Processor Series | HC08MR |
| Operating Temperature Grade | Industrial |
| On-chip Peripherals | Timers, PWM, ADC (HC08MR motor-control set) |
MC908MR16CBE 56-sdip (skinny dip, 0.600 inch / 15.24 mm) Pin Configuration Guide
Pin configuration for MC908MR16CBE (56-sdip (skinny dip, 0.600 inch / 15.24 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 MC908MR16CBE.
Refer to the datasheet for full pin configuration.
Typical Applications
MC908MR16CBE is suitable for 6 applications: BLDC Motor Drive Control, Appliance Control Board, HVAC Damper and Blower Controller, Industrial Stepper Indexer, Low-Cost Power Inverter Control, Industrial Sensor Transmitter.
BLDC Motor Drive Control
The MC908MR16CBE's HC08MR sub-family was specifically designed for three-phase brushless DC motor control. The 8-bit core at 8 MHz delivers approximately 8 MIPS, sufficient for trapezoidal commutation at typical 20 kHz PWM rates when written in efficient HC08 assembly or C. The integrated timer/PWM peripheral block generates complementary PWM outputs with dead-time insertion for safe half-bridge switching, while on-chip ADC channels sample phase currents and the DC bus for closed-loop torque control. With 16 KB of FLASH the device fits BLDC application firmware including startup ramp, sensorless BEMF detection, and fault handling routines. Pair the MCU with a three-phase gate driver such as the IR2130 or NXP MC33033, and place a 100 nF decoupling capacitor within 5 mm of each VDD pin to keep the analog reference clean during PWM transitions.
Recommended
Appliance Control Board
Washing machines, dishwashers, and refrigerators frequently pair an HC08MR-class MCU with a triac-based AC load driver for pump, valve, and heater control. The MC908MR16CBE's 16 KB of FLASH accommodates state-machine firmware for wash cycles, user-interface handling, and safety interlocks. Its 56-SDIP through-hole package withstands the wave-soldering processes and vibration typical of white-goods manufacturing lines. Industrial temperature rating and the legacy HC08 toolchain keep BOM cost low for high-volume appliance production. The HC08 core's deterministic interrupt latency simplifies the real-time response required for motor-overcurrent and over-temperature protection.
Recommended
HVAC Damper and Blower Controller
Commercial HVAC damper actuators and variable-speed blower controllers use HC08MR-class MCUs to drive single-phase or three-phase BLDC motors with closed-loop airflow regulation. The MC908MR16CBE's on-chip ADC reads temperature and pressure sensors, while its PWM outputs modulate the blower MOSFET gate. Industrial-grade operating temperature supports unconditioned equipment-room environments, and the 56-SDIP package simplifies field-service replacement. 16 KB of FLASH holds PID controller code plus Modbus or BACnet-style communication stacks for building-automation integration.
Recommended
Industrial Stepper Indexer
Stepper-motor indexer boards for pick-and-place, CNC auxiliary axes, and labeling machines commonly use the HC08MR MCU to generate step/direction pulses and ramp the acceleration profile. The MC908MR16CBE's HC08MR timer block produces precise step pulses with microstepping control signals sent to external driver ICs such as the A4988 or DRV8825. The 8 MHz bus keeps step rates accurate up to several kHz, and 16 KB of FLASH fits trapezoidal move profiles plus homing and limit-switch handling. SDIP packaging keeps the indexer board retrofittable into existing through-hole industrial control cards.
Recommended
Low-Cost Power Inverter Control
Small single-phase solar inverters and UPS systems use HC08MR MCUs to drive a full-bridge IGBT or MOSFET stage at fixed switching frequency with sinusoidal PWM. The MC908MR16CBE handles current and voltage sampling, MPPT firmware in resource-limited designs, and grid-sync zero-cross detection. Its 56-SDIP package provides ample creepage distance for line-voltage isolation layout. Although the 8-bit throughput is modest, it is sufficient for inverters below 500 W where switching frequency and dead-time control, not DSP throughput, dominate firmware complexity.
Recommended
Industrial Sensor Transmitter
Loop-powered 4-20 mA sensor transmitters and field-instrument signal conditioners can use the MC908MR16CBE for ADC readout, linearization, and HART-style communication modulation. 16 KB of FLASH fits polynomial calibration tables for RTD or thermocouple linearization, and the HC08MR ADC provides multiplexed analog inputs for bridge sensor excitation monitoring. The 56-SDIP through-hole form factor is compatible with legacy field-instrument PCB layouts that rely on screw-terminal wiring. Industrial temperature grade supports outdoor or process-plant mounting.
Recommended
Recommended Products Summary
Engineering reference data for MC908MR16CBE — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC908MR32CBE | MC908MR16CFUE |
|---|---|---|---|
| Package | 56-SDIP (0.600 inch) | 56-SDIP (0.600 inch) - same | 64-QFP - different |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Core | HC08MR (8-bit) | HC08MR (8-bit) - same | HC08MR (8-bit) - same |
| Maximum Clock Frequency | 8 MHz | 8 MHz - same | 8 MHz - same |
| FLASH Size | 16 KB (16K x 8) | 32 KB - 2x larger | 16 KB - same |
| Data Bus Width | 8 bit | 8 bit - same | 8 bit - same |
| Mounting Type | Through-Hole | Through-Hole - same | Surface Mount - different |
| Pin Count | 56 | 56 - same | 64 - different |
| Lifecycle Status | NRND | NRND | NRND |
Key Differentiators
- Doubled FLASH with same pinout and peripherals (vs MC908MR32CBE)
- Through-hole package option for legacy/industrial assembly (vs MC908MR16CFUE)
- HC08MR motor-control-oriented peripherals (vs Generic HC08 non-MR parts)
Design Notes
The 56-SDIP through-hole footprint uses 1.778 mm (0.070 inch) pitch pads. Drill holes at 1.0 mm with 1.6 mm pads to allow reliable wave soldering. Place a 100 nF ceramic decoupling capacitor within 5 mm of each VDD pin, and a bulk 10 uF tantalum or aluminum electrolytic on the same rail near the package. Route the crystal/oscillator traces short and symmetric, surrounded by a grounded guard ring if high-noise motor phases are nearby.
The 56-SDIP plastic package has a relatively high junction-to-ambient thermal resistance (estimated theta_JA approximately 60-70 C/W for SDIP-56), so the MC908MR16CBE rarely requires a heatsink. Estimated: at industrial ambient 85 C and 8 MHz operation the on-chip power dissipation is well under 200 mW, leaving ample thermal margin. Avoid sealing the part in a fully insulated potting compound without derating.
Do not assume a 16 KB FLASH part can hold 16 KB of compiled C code; reserve 256-512 bytes for the HC08 vector table and another sector for non-volatile parameters. Verify erase/write endurance (typically 10k cycles) before committing to in-field firmware-update features. The 'C' in the MPN indicates industrial temperature grade; if you see 'V' instead, that part is automotive grade and may have different qualification.
When the MC908MR16CBE is used in a motor-control board, isolate the analog reference AVSS/AVDD pair from the digital VSS/VDD pair with a ferrite bead or small inductor. Place ADC reference decoupling (10 uF + 100 nF) directly at the AVSS/AVDD pins to avoid PWM switching noise coupling into current-sense measurements. Use the HC08MR's built-in PWM dead-time generator rather than software delays to prevent shoot-through in the half-bridge.
Compliance Information
RoHS, REACH, lead-free and halogen-free status not present in the verified web data; do not assume compliance. AEC-Q100 not applicable for this industrial-grade part.
