MC68HC11D0CFB2 - 8-Bit 2MHz ROMless MCU 44-QFP | Freescale
MPN: MC68HC11D0CFB2 ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.11 | $7.11 |
| 10 | $7.11 | $71.10 |
| 100 | $7.11 | $711.00 |
| 500 | $7.11 | $3,555.00 |
| 1,000 | $7.11 | $7,110.00 |
| 10,000 | $7.11 | $71,100.00 |
MC68HC11D0CFB2 Overview
An 8-bit microcontroller is an integrated circuit that combines a CPU core, memory, timing logic, and general-purpose I/O on a single die. The M68HC11 family extends the classic Motorola 6800 architecture with additional on-chip peripherals and low-power HCMOS process technology, sitting within the broader hierarchy of embedded microcontroller units (MCUs) alongside the later HC08, HCS08, and S12 families.
Key features of the MC68HC11D0CFB2 include the 2 MHz bus operation that delivers predictable, deterministic instruction timing, ROMless program storage for externally supplied code, and the well-documented M68HC11 instruction set that remains in wide use in industrial maintenance and education. The 44-QFP (10x10 mm) footprint provides a reasonable pin count for external address and data buses while remaining hand-solderable in prototype and repair contexts.
Architecturally, the device executes the M68HC11 instruction set over the 6800 CPU core, using HCMOS fabrication for reduced power consumption compared with earlier NMOS parts. Because the part is ROMless, system designers supply program storage externally, which simplifies firmware updates during development and allows the same silicon to serve multiple code images.
Typical applications include legacy industrial control equipment, automotive subsystem maintenance, motor control retrofit boards, and test fixtures built around the M68HC11 ecosystem. Many long-life industrial machines still depend on this family, driving continued demand for authorized replacements.
Design consideration: since the MCU is ROMless, verify that your board provides external EPROM/Flash and address latching, and confirm bus timing at your chosen crystal frequency against the 2 MHz maximum rating.
This page synthesizes distributor pricing (as of 2026-10-18), drop-in alternatives including Tekmos engineered replacements, and practical sourcing notes not found in the manufacturer datasheet.
Drop-in alternatives for MC68HC11D0CFB2 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MC68HC11D0CFB3
✅ Drop-In📋 Reference alternative (not in catalog)
TK68HC11D0CFB2
✅ Drop-In📋 Reference alternative (not in catalog)
MC68HC11D0CFB2 Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit M680x0 (68HC11 CPU) |
| Core Processor | M68HC11 |
| Maximum Clock Frequency | 2 MHz |
| Program Memory Type | ROMless (external memory) |
| Process Technology | HCMOS |
| Package | 44-QFP (10x10 mm) / PQFP-44 |
| Mounting Type | Surface Mount |
| Standard Package Quantity | 1 (Bulk per distributor listing) |
| Manufacturer Series | M68HC11 D Series |
| Lifecycle Status | Obsolete - supported via Rochester Electronics LLC authorized continued production |
| Packaging | Bulk |
MC68HC11D0CFB2 1 (bulk per distributor listing) Pin Configuration Guide
Pin configuration for MC68HC11D0CFB2 (1 (bulk per distributor listing) 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 MC68HC11D0CFB2.
Refer to the datasheet for full pin configuration.
Typical Applications
MC68HC11D0CFB2 is suitable for 6 applications: Legacy Industrial Control Systems, Automotive ECU Maintenance and Retrofit, Test and Measurement Fixtures, Embedded Systems Education and Training, Motor Control Legacy Boards, Obsolescence Management and Last-Time-Buy Programs.
Legacy Industrial Control Systems
Many programmable logic controllers, process controllers, and factory automation boards built in the 1990s and 2000s were designed around the M68HC11 family and remain in service today. The MC68HC11D0CFB2 fits these repairs exactly: its 8-bit 68HC11 core, 2 MHz deterministic bus timing, and 44-QFP (10x10 mm) footprint match the original board design pin-for-pin, so no PCB rework is required. Because the device is ROMless, the board's existing external EPROM/Flash with the original firmware continues to operate unchanged, preserving cycle-accurate timing that some industrial loops depend on. With original stock limited (42 units at DigiKey as of 2026-10-18), pair repairs with the Tekmos TK68HC11D replacement for future service events.
Recommended
Automotive ECU Maintenance and Retrofit
The M68HC11 family was widely deployed in engine controllers, transmission modules, and body-control units of the era, and independent repair shops still restore these ECUs. The MC68HC11D0CFB2 provides the authentic 8-bit 68HC11 instruction execution at 2 MHz that factory firmware expects, in the same 44-QFP package, allowing direct socket-in replacement without reprogramming. Its HCMOS process keeps power dissipation within the original thermal envelope of sealed under-hood enclosures. Because replacement ECUs are often unavailable or prohibitively expensive, component-level repair with an authorized Rochester Electronics part at $7.11 per unit (as of 2026-10-18) is frequently the only economical path. Verify supply voltage and bus timing against the vehicle harness before installation.
Recommended
Test and Measurement Fixtures
Bench instruments, data loggers, and automated test fixtures from the HC11 era use the 68HC11 core for sequencer and communication tasks. The MC68HC11D0CFB2 suits these fixtures because its 2 MHz bus delivers fixed-cycle instruction timing, which matters when fixture timing routines were calibrated against original HC11 cycle counts. The ROMless architecture is an advantage in fixture service: firmware lives in a socketed external EPROM, so a fixture can be re-tasked by swapping memory without touching the MCU. The 44-QFP surface-mount package matches the original land pattern exactly. For new fixture builds, engineers should instead select a modern MCU; this part is recommended strictly for keeping existing capital equipment running.
Recommended
Embedded Systems Education and Training
Universities and technical colleges continue to teach the M68HC11 architecture because of its clean 6800-derived instruction set, extensive textbook coverage, and simple external-memory development model. The MC68HC11D0CFB2 is ideal for lab boards: being ROMless, students program external EPROM or use monitor code in external memory, gaining hands-on understanding of address latching, bus timing at 2 MHz, and memory maps. The 44-QFP (10x10 mm) package exposes enough pins for full bus observation with logic analyzers. Stock from Rochester Electronics at $7.11 per unit (as of 2026-10-18) supports classroom procurement, and the Tekmos TK68HC11D replacement guarantees availability for future semesters without course redesign.
Recommended
Motor Control Legacy Boards
Older DC and stepper motor controllers used HC11 microcontrollers for closed-loop sequencing, and many of these drives still operate in material handling and packaging lines. The MC68HC11D0CFB2 fits these drive boards with its original 44-QFP footprint and cycle-accurate 2 MHz execution, ensuring PWM and step timing remain identical to the design intent. HCMOS technology keeps drive-board thermal behavior unchanged, and the ROMless design means the control firmware in external memory is untouched by the MCU swap. Obtaining the authorized Rochester Electronics part avoids the functional risk of unverified gray-market chips. For drives being redesigned, the S12 family provides a modernization path with richer peripherals.
Recommended
Obsolescence Management and Last-Time-Buy Programs
Companies operating long-lifecycle equipment (medical, avionics ground support, energy) run obsolescence-management programs that must secure genuine parts before stocks vanish. The MC68HC11D0CFB2 illustrates the typical program pattern: manufacturer discontinued, authorized continued production via Rochester Electronics at $7.11 per unit flat pricing (as of 2026-10-18), and only 42 units of open-market stock reported. Procurement teams should lock supply via Rochester build-to-order agreements or qualify the Tekmos TK68HC11D-series functional replacement, which is actively manufactured and eliminates recurring obsolescence events. Both options use the identical 44-QFP (10x10 mm) footprint, so no PCB redesign or requalification of the board layout is needed.
Recommended
Recommended Products Summary
Engineering reference data for MC68HC11D0CFB2 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC68HC11D0CFB3 | TK68HC11D0CFB2 |
|---|---|---|---|
| Package | 44-QFP (10x10 mm) | 44-QFP (10x10 mm) - same | 44-QFP (10x10 mm) - same |
| Brand | Freescale Semiconductor (Rochester Electronics continued production) | Freescale Semiconductor | Tekmos Inc. |
| Core | 8-bit M68HC11 (6800 CPU) | 8-bit M68HC11 (6800 CPU) | 8-bit M68HC11 (6800 CPU), reimplemented |
| Max Clock Frequency | 2 MHz | 2 MHz (verify grade suffix) | 2 MHz |
| Program Memory | ROMless (external) | ROMless (external) | ROMless (external); Flash versions also offered in D series |
| Process Technology | HCMOS | HCMOS | HCMOS-equivalent (modern fabrication) |
| Lifecycle / Supply | Obsolete - Rochester Electronics continued production, 42 units at DigiKey (2026-10-18) | Obsolete - Rochester Electronics continued production | Actively manufactured by Tekmos - no obsolescence risk |
Key Differentiators
- Genuine original silicon availability (vs TK68HC11D0CFB2)
- Long-term supply security (vs MC68HC11D0CFB3)
- Flat pricing across all volumes (vs MC68HC11D0CFB3)
Design Notes
The MC68HC11D0CFB2 is ROMless: it will not execute anything without external program memory. Confirm your board provides EPROM/Flash, address latches (typically 74HC373/573), and correct MODE signals for expanded-bus operation before assuming a failed MCU is the fault. When replacing a socketed part, inspect for bus contention from a partially failed external memory device, a frequent misdiagnosis on HC11 boards.
Verify the supply voltage applied to the replacement device against the original board regulator output. Distributor summary data for this part did not publish the supply voltage range, so consult the Motorola/Freescale MC68HC11 D-series datasheet (150-page PDF on Alldatasheet) for absolute maximum ratings before powering up a repaired board. HCMOS parts tolerate neither overvoltage nor floating inputs on the external bus.
At the full 2 MHz bus rate, external address/data bus traces on HC11-era boards were laid out with relaxed rules by modern standards. When substituting a reimplemented part such as the Tekmos TK68HC11D0, keep crystal loading capacitors per the original board values and confirm AC timing (address setup, data setup, E-clock edges) with an oscilloscope during first power-up, since modern fabrications may have slightly different output edge rates.
Compliance Information
Compliance data was not published in the verified distributor listings for this legacy discontinued part. Legacy HC11 devices predate modern RoHS declarations; consult Rochester Electronics for continued-production compliance documentation.
