MC68HC705L5FUE - 8-Bit HC05 MCU 8KB EPROM 80-QFP | NXP
MPN: MC68HC705L5FUE ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $22.5 | $22.50 |
| 10 | $19.8 | $198.00 |
| 100 | $17.25 | $1,725.00 |
| 500 | $15.1 | $7,550.00 |
| 1,000 | $13.4 | $13,400.00 |
MC68HC705L5FUE Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (ROM/EPROM/Flash), working RAM, and a range of peripheral interfaces (timers, serial ports, GPIO, ADCs) into one package. Within the broader semiconductor hierarchy, an MCU sits below microprocessors (MPUs, which need external memory) and above generic logic ICs; the HC05 family specifically belongs to the 8-bit CISC category originally introduced by Motorola and now maintained by NXP. The 'HC705' prefix denotes an EPROM/OTP-programmable derivative of the masked-ROM HC05, intended for prototyping and low-volume production.
Key features of the MC68HC705L5FUE include 8KB of user-programmable EPROM with on-chip charge pump for in-circuit programming, 176 bytes of on-chip RAM, a 16-bit programmable timer with input-capture/output-compare, an 8-bit A/D converter (per family datasheet), a Serial Communications Interface (SCI), and a Serial Peripheral Interface (SPI). The 80-pin QFP (QFP-80, 14x14 mm, gull-wing) package provides ample I/O for LCD drive, keypad scanning, and bus expansion.
The architecture is a fully static CMOS design with low-power STOP and WAIT modes, supporting operation from a single 3.3 V or 5 V supply. The M68HC05 instruction set is well documented and supported by legacy assemblers and C compilers from Cosmic, IAR, and Metrowerks.
Typical applications include industrial control panels, low-end consumer appliances, security/keypad systems, and legacy instrumentation where the HC05 ecosystem is already deployed. The EPROM windowed package (UV-erasable) is most useful for engineering development and low-volume programming iterations. As of 2026-10-09, the part is in mature/legacy status with NXP/Freescale; new designs should evaluate ColdFire or Kinetis replacements.
Drop-in alternatives for MC68HC705L5FUE — 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:
MC68HC05L5FU
✅ Drop-In📋 Reference alternative (not in catalog)
MC68HC705L5FU
✅ Drop-In📋 Reference alternative (not in catalog)
MC68HC705L5CFU
✅ Drop-In📋 Reference alternative (not in catalog)
MC68HC705L5VFU
✅ Drop-In📋 Reference alternative (not in catalog)
MC68HC705L5FUE Maximum Ratings & Electrical Characteristics
| Core | M68HC05 (8-bit CISC) |
| Program Memory | 8 KB (8K x 8) EPROM, UV-erasable |
| RAM | 176 bytes |
| CPU Clock Speed | 2.1 MHz |
| Bus Width | 8-bit |
| Package | 80-QFP (14x14 mm), gull-wing |
| Number of Pins | 80 |
| Mounting Type | Surface Mount (SMD) |
| Terminal Form | GULL WING |
| Temperature Grade | COMMERCIAL |
| Timers | 16-bit programmable timer with input capture / output compare |
| Serial Interfaces | SCI (UART), SPI |
| Low-Power Modes | STOP, WAIT |
| Processor Series | HC05 |
MC68HC705L5FUE 80-qfp (14x14 mm), gull-wing Pin Configuration Guide
Pin configuration for MC68HC705L5FUE (80-qfp (14x14 mm), gull-wing 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 MC68HC705L5FUE.
Refer to the datasheet for full pin configuration.
Typical Applications
MC68HC705L5FUE is suitable for 7 applications: Industrial Control Panels, Legacy Consumer Appliance Controllers, Security and Keypad Systems, Test and Measurement Instrumentation, Automotive Body Electronics (Legacy), Educational and Hobbyist Development, IoT Sensor Nodes (Retrofit / Legacy).
Industrial Control Panels
The MC68HC705L5FUE suits industrial control panels because its 8-bit M68HC05 core at 2.1 MHz easily handles keypad scanning, relay control loops, and indicator updates within cycle budgets. The 80-QFP package exposes enough parallel I/O to drive 7-segment displays and matrix keypads directly, while the integrated 16-bit timer provides input-capture for pulse counting from flow or rotation sensors. The EPROM-based program memory allows last-minute firmware customization for OEM panel variants without retooling.
Recommended
Legacy Consumer Appliance Controllers
The MC68HC705L5FUE is a natural fit for legacy consumer appliances such as washing machines, microwave ovens, and dishwasher control boards where the HC05 firmware base is already deployed. The 8 KB EPROM is sufficient for state-machine appliance logic, and the SCI/SPI interfaces connect to motor drivers and sensor ICs without extra glue logic. The STOP and WAIT low-power modes allow standby current to drop below typical appliance standby budgets. Designers maintain the existing firmware investment while replacing obsolete ceramic-windowed stock.
Recommended
Security and Keypad Systems
The MC68HC705L5FUE is well suited to security keypad and access-control systems that need reliable debounced key scanning, PIN storage in EPROM, and serial reporting to a central panel. The 176-byte RAM holds temporary scratch buffers while 8 KB of EPROM stores the full PIN database and protocol stack. The SCI (UART) peripheral communicates with the central controller, while the 16-bit timer drives real-time clock tick generation. The ceramic windowed package supports secure code erasure during maintenance.
Recommended
Test and Measurement Instrumentation
The MC68HC705L5FUE serves as a controller in entry-level test and measurement instruments such as handheld multimeters, insulation testers, and process calibrators, where its 2.1 MHz core and 8 KB program memory are enough for measurement sequencing, range switching, and LCD drive. The A/D interface (per the HC05L5 family) reads sensor outputs, while SCI outputs data to PCs or printers. EPROM programmability allows calibration-table updates per instrument variant without changing the PCB. As of 2026-10-09, this remains a stable application for legacy HC05 stock.
Recommended
Automotive Body Electronics (Legacy)
The MC68HC705L5FUE is used in legacy automotive body-electronics modules (mirror controllers, climate nodes, seat controllers) where HC05 firmware is certified and validated for long-life vehicle platforms. The 80-QFP footprint supports the wiring-harness connector count and switch inputs typical of body modules, while the SCI peripheral talks to the vehicle bus. Extended-temperature variants of the same die (HC705L5VFU) cover under-hood conditions. New automotive designs should evaluate NXP S32K or S08 family instead.
Recommended
Educational and Hobbyist Development
The MC68HC705L5FUE is a useful educational platform for learning 8-bit CISC programming, EPROM-based code development, and QFP soldering techniques because it combines the M68HC05 instruction set with UV-erasable program memory. Students can develop, program, UV-erase, and re-run code on the same part, mirroring how engineers prototyped in the 1990s. Legacy development boards, assemblers, and simulators are still available from Cosmic, P&E Micro, and community archives.
Recommended
IoT Sensor Nodes (Retrofit / Legacy)
The MC68HC705L5FUE can act as the controller in retrofit or brownfield IoT sensor nodes where the 8 KB EPROM holds a small sensor-fusion or polling algorithm and the SCI/SPI peripherals drive radio or modem modules. With external radios, the node integrates into existing HC05 fleet deployments without firmware overhaul. Note that modern low-power IoT designs typically prefer Cortex-M0+ parts, but the HC05 remains valid where fleet uniformity and proven firmware are paramount.
Recommended
Recommended Products Summary
Engineering reference data for MC68HC705L5FUE — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC68HC05L5FU | MC68HC705L5FU | MC68HC705L5CFU | MC68HC705L5VFU |
|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 80-QFP (14x14 mm) | 80-QFP (14x14 mm) | 80-QFP (14x14 mm) | 80-QFP (14x14 mm) | 80-QFP (14x14 mm) |
| Program Memory | 8 KB EPROM (UV) | 8 KB Masked ROM | 8 KB EPROM (OTP, no window) | 8 KB EPROM (UV, comm. temp) | 8 KB EPROM (UV, ext. temp) |
| CPU Core | M68HC05 (8-bit) | M68HC05 (8-bit) | M68HC05 (8-bit) | M68HC05 (8-bit) | M68HC05 (8-bit) |
| Max CPU Clock | 2.1 MHz | 2.1 MHz | 2.1 MHz | 2.1 MHz | 2.1 MHz |
| RAM | 176 bytes | 176 bytes | 176 bytes | 176 bytes | 176 bytes |
| Program Memory Type | UV-EPROM (windowed) | Masked ROM (factory programmed) | OTP EPROM (no window) | UV-EPROM (windowed) | UV-EPROM (windowed) |
| Temperature Grade | Commercial | Commercial | Commercial | Commercial | Extended / Automotive |
Key Differentiators
- UV-erasable windowed package for code iteration (vs MC68HC05L5FU)
- Same-package second source for inventory continuity (vs MC68HC705L5FU)
- Commercial temperature grade availability (vs MC68HC705L5VFU)
Design Notes
The MC68HC705L5FUE operates from a single 5 V supply (per the HC05 family datasheet) and integrates STOP and WAIT low-power modes. Decouple VDD/VSS pairs with a 100 nF ceramic capacitor placed within 5 mm of each supply pin, and add a bulk 10 uF electrolytic or tantalum capacitor near the package. Use STOP mode for sub-uA standby current; ensure the IRQ pin is correctly configured to wake the part from STOP. Refer to the HC05 Family Reference Manual for the exact register sequence to enter and exit STOP safely.
The 80-QFP (14x14 mm) package has gull-wing leads at 0.8 mm pitch; design the land pattern per IPC-7351 nominal-QFP footprints to ensure reliable assembly. Place the external crystal or oscillator within 10 mm of the OSC1/OSC2 pins, route the crystal traces over a continuous ground plane, and guard them with ground traces to minimize EMI pickup. Keep the RESET pin trace short and add a 1 kohm pull-up to VDD plus a 1 nF cap to ground for noise immunity.
Common pitfalls on the MC68HC705L5FUE include: (1) confusing the FUE (UV windowed) suffix with FU (OTP, no window) - erasing the OTP part is impossible; (2) forgetting the HC05's 8-bit stack pointer limits and recursion depth - the on-chip stack is tiny; (3) misprogramming the EPROM security bit - once set, the EPROM cannot be re-verified; (4) using too-large decoupling caps on the IRQ/reset network - slows the edge; (5) neglecting the IRQ vector mapping, which differs from later HC08/HCS08 parts. Always refer to the device-specific datasheet alongside the HC05 family reference manual.
Compliance Information
The MC68HC705L5FUE is a legacy NXP/Freescale MCU originally introduced in the 1990s; full RoHS/REACH compliance status for this specific windowed ceramic package is not confirmed by the verified web data. The VFU variant is automotive-grade but is not AEC-Q100 qualified in the traditional sense (HC05 predates AEC-Q100 documentation in many cases).
