MC68711E20MFNE2 - 8-Bit HC11 MCU 20KB OTP 768B RAM | NXP
MPN: MC68711E20MFNE2 ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $28.5 | $28.50 |
| 10 | $24.1 | $241.00 |
| 100 | $20.75 | $2,075.00 |
| 500 | $18.4 | $9,200.00 |
| 1,000 | $16.9 | $16,900.00 |
MC68711E20MFNE2 Overview
The 68HC11 family is a classic M68HC11 architecture microcontroller family. An 8-bit MCU (microcontroller unit) integrates a CPU, program memory (ROM/EPROM/OTP), data RAM, and on-chip peripherals onto a single silicon die. Within the broader embedded taxonomy, 8-bit MCUs sit below 16-bit and 32-bit MCUs in computational throughput, but offer deterministic behavior, low cost, and easy programmability that make them ideal for cost-sensitive, latency-predictable control applications ranging from appliances and HVAC to industrial automation and automotive subsystems. The HC11 was one of the most widely adopted 8-bit cores of the 1990s and remains in long-lifecycle products and legacy maintenance designs.
Key features of the MC68711E20MFNE2 include its 4 MHz maximum bus frequency, integrated oscillator support, the M68HC11 instruction set with extensive addressing modes, and on-chip peripheral functions such as timers, an 8-bit ADC (analog-to-digital converter), and serial interfaces (SCI/SPI). The 20 KB OTP memory supports customer-programmable code development for low-to-medium volume production, while the 768-byte RAM provides data working space suitable for small control loops and stack operations. The 52-PLCC package provides robust J-lead contacts for robust socketing and field replacement.
Architecturally, the E-series variants share the same CPU, instruction set, and peripheral set, differing primarily in memory type and size. The 'E20' suffix designates 20 KB of EPROM/OTP, while 'MFN' indicates the plastic-leaded chip carrier package and the E2 temperature/operating variant. This part uses CMOS technology with a fully static design that allows operation over a wide voltage range and clock-speed-down to DC.
Typical applications include industrial control systems, automotive body and chassis electronics, HVAC controls, security systems, and consumer appliances where the proven HC11 ecosystem and existing codebase provide a low-risk migration path. The OTP memory variant specifically suits medium-volume production where mask-ROM tooling costs are not justified.
When designing with this part, designers must consider that it is flagged as 'No Longer Manufactured' by the manufacturer, so lifecycle planning should include secure long-term inventory or migration to the actively-produced M68HC11 mask-ROM or EEPROM siblings, or to a modern ColdFire/S08 successor.
This page synthesizes distributor pricing, lifecycle status, drop-in-compatible alternatives from the 68HC11E family, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for MC68711E20MFNE2 — 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 MC68711E20MFNE2 (same form factor and footprint) — differing in Package, ADC, Core Architecture, Lifecycle Status, Maximum Clock Frequency.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MC68711E20CFNE2
✅ Drop-In✓ In Stock
$13.2 / Unit
View Datasheet →MC68711E20CFNE4
✅ Drop-In📋 Reference alternative (not in catalog)
MC68HC11E1CFNE2
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MC68HC11E0CFNE2
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MC9S08QG8CFFE
✅ Drop-In✓ In Stock
Contact for price
View Datasheet →MC68711E20MFNE2 Maximum Ratings & Electrical Characteristics
| Core Architecture | M68HC11 8-bit CPU |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 20 KB (20K x 8) |
| RAM Size | 768 bytes |
| Number of I/O Lines | 38 |
| Maximum Clock Frequency | 4 MHz |
| Oscillator Type | Internal |
| Package | 52-LCC (J-Lead), 19.1 x 19.1 mm |
| Operating Voltage Range | 5 V nominal |
| ADC | On-chip 8-bit |
| Serial Interfaces | SCI (UART) + SPI |
| Timers | On-chip (16-bit free-running + capture/compare) |
| Technology | CMOS, fully static |
| Packaging | Tube |
| Lifecycle Status | Obsolete (Not Longer Manufactured per NXP) |
| Family Series | 68HC11E family |
MC68711E20MFNE2 Pin Configuration
| Pin 1 | VSS — Ground |
| Pin 2 | MODB/VSTBY — Mode B / Standby power input |
| Pin 3 | MODA/LIR — Mode A / Load Instruction Register |
| Pin 4 | IRQ — Maskable interrupt request |
| Pin 5 | RESET — Active-low reset input |
| Pin 6 | XTAL — Crystal/clock input |
| Pin 7 | EXTAL — External clock/crystal input |
| Pin 8 | VDD — Positive supply (5 V) |
| Pin 9 | PA0/IC3 — Port A bit 0 / Input Capture 3 |
| Pin 10 | PA1/IC2 — Port A bit 1 / Input Capture 2 |
| Pin 11 | PA2/IC1 — Port A bit 2 / Input Capture 1 |
| Pin 12 | PA3/IC4/OC5 — Port A bit 3 / Input Capture 4 / Output Compare 5 |
| Pin 13 | PA4/OC4 — Port A bit 4 / Output Compare 4 |
| Pin 14 | PA5/OC3 — Port A bit 5 / Output Compare 3 |
| Pin 15 | PA6/OC2 — Port A bit 6 / Output Compare 2 |
| Pin 16 | PA7/OC1 — Port A bit 7 / Output Compare 1 |
| Pin 17 | VRL — ADC reference low |
| Pin 18 | VRH — ADC reference high |
| Pin 19 | PE0/AN0 — Port E bit 0 / ADC input 0 |
| Pin 20 | PE1/AN1 — Port E bit 1 / ADC input 1 |
| Pin 21 | PE2/AN2 — Port E bit 2 / ADC input 2 |
| Pin 22 | PE3/AN3 — Port E bit 3 / ADC input 3 |
| Pin 23 | PE4/AN4 — Port E bit 4 / ADC input 4 |
| Pin 24 | PE5/AN5 — Port E bit 5 / ADC input 5 |
| Pin 25 | PE6/AN6 — Port E bit 6 / ADC input 6 |
| Pin 26 | PE7/AN7 — Port E bit 7 / ADC input 7 |
| Pin 27 | PB0 — Port B bit 0 (output) |
| Pin 28 | PB1 — Port B bit 1 (output) |
| Pin 29 | PB2 — Port B bit 2 (output) |
| Pin 30 | PB3 — Port B bit 3 (output) |
| Pin 31 | PB4 — Port B bit 4 (output) |
| Pin 32 | PB5 — Port B bit 5 (output) |
| Pin 33 | PB6 — Port B bit 6 (output) |
| Pin 34 | PB7 — Port B bit 7 (output) |
| Pin 35 | PC0 — Port C bit 0 (I/O) |
| Pin 36 | PC1 — Port C bit 1 (I/O) |
| Pin 37 | PC2 — Port C bit 2 (I/O) |
| Pin 38 | PC3 — Port C bit 3 (I/O) |
| Pin 39 | PC4 — Port C bit 4 (I/O) |
| Pin 40 | PC5 — Port C bit 5 (I/O) |
| Pin 41 | PC6 — Port C bit 6 (I/O) |
| Pin 42 | PC7 — Port C bit 7 (I/O) |
| Pin 43 | PD0/RXD — Port D bit 0 / SCI receive |
| Pin 44 | PD1/TXD — Port D bit 1 / SCI transmit |
| Pin 45 | PD2/MISO — Port D bit 2 / SPI MISO |
| Pin 46 | PD3/MOSI — Port D bit 3 / SPI MOSI |
| Pin 47 | PD4/SCK — Port D bit 4 / SPI clock |
| Pin 48 | PD5/SS — Port D bit 5 / SPI slave select |
| Pin 49 | PD6 — Port D bit 6 (I/O) |
| Pin 50 | PD7 — Port D bit 7 (I/O) |
| Pin 51 | XIRQ — Non-maskable interrupt request |
| Pin 52 | VDD — Positive supply (5 V) - secondary |
Typical Applications
MC68711E20MFNE2 is suitable for 6 applications: Industrial Process Control Systems, Automotive Body Electronics, HVAC Climate Control, Security and Alarm Panels, Consumer Appliance Controllers, Legacy Industrial Printers and Peripherals.
Industrial Process Control Systems
The MC68711E20MFNE2's 4 MHz M68HC11 CPU and integrated 8-bit ADC make it well-suited for industrial process controllers where sensor reading and discrete output control dominate the workload. With 20 KB of OTP EPROM and 768 bytes of RAM, the device handles PID loops, alarm monitoring, and communication with operator panels. The 38 digital I/O lines support multiple sensor inputs and actuator outputs without external multiplexers. CMOS fully-static operation with 5 V supply allows reliable operation in industrial temperature ranges, though designers should verify [DATA_NEEDED: exact temperature grade]. The HC11's deterministic instruction timing makes it ideal for hard-real-time control where deterministic response to interrupts is critical, and its long ecosystem of compilers, debuggers, and reference designs lowers engineering risk for legacy industrial retrofits.
Recommended
Automotive Body Electronics
The MC68711E20MFNE2's HC11 architecture and on-chip peripheral set (SCI, SPI, timers, ADC) are well-matched to automotive body electronics like lighting controllers, seat controllers, and climate-control panels. Operating at 4 MHz from a 5 V supply, the device provides deterministic loop times suitable for CAN-style body communication, although an external transceiver is required. The 52-PLCC J-lead package supports through-hole-style sockets that aid factory assembly and field serviceability for vehicle production lines. With 38 I/O lines and a 16-bit timer with capture/compare, the MCU handles PWM motor control for window lifters, mirror adjusters, and HVAC blend doors. For new automotive designs, the automotive-grade S08/S12 family is the recommended migration path with AEC-Q100 qualification.
Recommended
HVAC Climate Control
The MC68711E20MFNE2's 4 MHz CPU, 768-byte RAM, and on-chip ADC and timers are well-suited to HVAC control panels managing temperature sensing, fan-speed PWM outputs, and multi-stage compressor control. The 20 KB OTP EPROM comfortably stores PID control firmware and lookup tables for setpoint scheduling across heating/cooling modes. The 38 I/O lines accommodate multiple temperature sensors, switch inputs, and triac-driver outputs without external I/O expanders. Wide operating voltage tolerance (within [DATA_NEEDED: exact VDD]) enables power sharing with the 24 VAC transformer common in HVAC systems. The HC11's deterministic interrupt response keeps mode-transition glitches out of the user experience, and the legacy code base has been refined by decades of HVAC engineering.
Recommended
Security and Alarm Panels
The MC68711E20MFNE2's deterministic interrupt response and 4 MHz throughput are well-matched to security alarm panels that monitor multiple zones, drive sirens and keypads, and log events. The 20 KB OTP EPROM stores the zone-monitor firmware, the 768-byte RAM provides event buffering for keypad entries, and the on-chip ADC supports battery-voltage supervision during AC power loss. The SCI serial interface connects to the keypad bus, and the SPI bus drives digital-output expansion for high-zone-count installations. The 38 I/O lines accommodate typical 8- to 16-zone panels with room for indicator LEDs. The legacy HC11 code base has been hardened against false-trip glitches over decades of security deployments, making the platform well-trusted for this duty.
Recommended
Consumer Appliance Controllers
The MC68711E20MFNE2's HC11 CPU and on-chip peripherals are widely deployed in legacy dishwasher, washing machine, and oven controllers, where 4 MHz throughput and 20 KB OTP are sufficient for motor control, water-level sensing, and front-panel interfaces. The 8-bit ADC reads NTC thermistors and water-level sensors, while the 16-bit timer generates triac-fired zero-cross PWM for motor and heater control. The 38 I/O lines support rotary encoders, LED indicators, and segment LCD multiplex. The 5 V supply and CMOS architecture yield acceptable standby power for ENERGY STAR compliance. Designers updating existing designs can retain PCBs while swapping OTP parts for EEPROM siblings in the same 52-PLCC package, minimizing retooling costs.
Recommended
Legacy Industrial Printers and Peripherals
The MC68711E20MFNE2 was a common choice for industrial printers, label applicators, and point-of-sale terminals in the 1990s and 2000s, and many of these products remain in service today. Its SCI and SPI interfaces drive external UART modems, IO expanders, and stepper drivers for paper-feed mechanisms. The 20 KB OTP holds font tables and protocol stacks for serial/parallel terminals. Designers maintaining legacy printers can drop in the lower-speed 2 MHz siblings (MC68711E20CFNE2) for low-cost PCB rework, or migrate to the modern S08 family while retaining peripheral pinout compatibility through NXP's 68HC11-to-S08 migration guide.
Recommended
Recommended Products Summary
Engineering reference data for MC68711E20MFNE2 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC68711E20CFNE2 | MC68711E20CFNE4 | MC68HC11E1CFNE2 | MC68HC11E0CFNE2 |
|---|---|---|---|---|---|
| Package | 52-LCC (J-Lead), 19.1 x 19.1 mm | 52-LCC (J-Lead), 19.1 x 19.1 mm - same | 52-LCC (J-Lead), 19.1 x 19.1 mm - same | 52-LCC (J-Lead), 19.1 x 19.1 mm - same | 52-LCC (J-Lead), 19.1 x 19.1 mm - same |
| Brand | NXP Semiconductors | NXP Semiconductors - same | NXP Semiconductors - same | NXP Semiconductors - same | NXP Semiconductors - same |
| Core | M68HC11 8-bit | M68HC11 8-bit - same | M68HC11 8-bit - same | M68HC11 8-bit - same | M68HC11 8-bit - same |
| Maximum Clock | 4 MHz | 2 MHz (-50%) | 2 MHz (-50%) | 2 MHz (-50%) | 2 MHz (-50%) |
| Program Memory Type | OTP EPROM 20 KB | OTP EPROM 20 KB - same | OTP EPROM 20 KB - same | Mask ROM (not customer programmable) | No on-chip program memory (external) |
| RAM Size | 768 B | 768 B - same | 768 B - same | 768 B - same | 256 B (-67%) |
| I/O Count | 38 | 38 - same | 38 - same | 38 - same | 38 - same |
| Lifecycle Status | Obsolete (NLM) | Obsolete (NLM) | Obsolete (NLM) | Obsolete (NLM) | Obsolete (NLM) |
Key Differentiators
- Highest 4 MHz clock speed in the OTP 20KB E-family (vs MC68711E20CFNE2)
- Customer-programmable OTP memory (vs MC68HC11E1CFNE2)
- Legacy maintenance compared to modern S08/S12 family (vs MC9S08QG8CFFE)
Design Notes
Estimated: When migrating from the 4 MHz MC68711E20MFNE2 to the 2 MHz MC68711E20CFNE2/CFNE4, recalculate all timing loops and timer-based delays. The HC11 executes instructions in 1-5 bus cycles, so a 50% clock reduction translates to a 50% execution-time penalty that can break tight CPU-bound routines. Software timing utilities like the 'Computime' delay routines commonly used with 68HC11 must be updated to the new clock frequency.
Place the external crystal or ceramic resonator as close as possible to pins 6 (XTAL) and 7 (EXTAL), with short ground-guard traces to minimize EMI pickup. For higher-frequency or noise-sensitive designs, add a 10-22 pF trimmer capacitor in series with the crystal. Route the RESET line away from high-current switching nodes to prevent spurious resets in motor-control environments.
The HC11E family requires stable 5 V VDD - add a 100 nF ceramic bypass capacitor as close to each VDD pin (8 and 52) as possible, plus a bulk 10 uF tantalum or aluminum electrolytic capacitor at the board input. In battery-backed applications, the MODB/VSTBY pin (2) requires a separate standby supply to preserve RAM contents during main VDD loss; otherwise RAM data will be lost during brown-out.
Because the part is officially 'No Longer Manufactured,' do not design it into new products without a written long-term supply agreement or migration plan. Maintain at least 12-24 months of finished-goods inventory and qualify the next-generation S08/S12/ColdFire upgrade alongside the existing HC11 design during the design phase to enable seamless end-of-life transition.
Compliance Information
Lifecycle obsolete per NXP; specific RoHS/REACH compliance details are not documented in the verified web data and should be confirmed via distributor compliance certificates before export-bound designs.
