MCF51QE128CLK - 32-bit ColdFire V1 MCU 128KB Flash 50MHz | NXP
MPN: MCF51QE128CLK ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
MCF51QE128CLK Overview
A 32-bit MCU is a complete computing system on a single chip, combining a processor core, flash program memory, RAM, clock generation, and multiple peripherals such as ADCs, timers, and serial interfaces. Within the product hierarchy, the MCF51QE128 sits at the low end of the 32-bit ColdFire controller family, bridging the gap between 8-bit microcontrollers and higher-performance 32-bit devices.
Key features include the Version 1 ColdFire CPU delivering up to 50.33 MHz above 2.4 V (40 MHz above 2.1 V and 20 MHz above 1.8 V), approximately 0.94 Dhrystone MIPS/MHz, a 24-channel 12-bit ADC, and operation from 2.5 V or 3.3 V supplies. The QE family's Flexis architecture means 8-bit pin-compatible siblings exist, easing migration as application complexity grows.
Architecturally, the ColdFire V1 core is a resource-efficient implementation of the ColdFire instruction set, offering compact code density and deterministic execution suited to embedded control. The integrated flash and rich analog peripherals reduce external component count and system cost.
Typical applications include industrial control systems, consumer appliances, and motor-control or sensor-interface boards where a 12-bit, 24-channel ADC is valuable.
Design consideration: verify CPU frequency versus supply voltage, since maximum clock scales with VDD per the manufacturer datasheet.
IMPORTANT: this part is marked End of Life by NXP; this page adds drop-in alternatives, comparison data, and sourcing guidance beyond the manufacturer datasheet.
Drop-in alternatives for MCF51QE128CLK — 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 MCF51QE128CLK (same form factor and footprint) — differing in Package, Series, Core Processor, Maximum CPU Frequency, Performance.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MCF51QE128VLK
✅ Drop-In📋 Reference alternative (not in catalog)
MCF51QE64CLK
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MCF51JE128VLK
✅ Drop-In✓ In Stock
$6.95 / Unit
View Datasheet →MCF51MM128VLK
✅ Drop-In✓ In Stock
Contact for price
View Datasheet →MCF51QE128CLK Maximum Ratings & Electrical Characteristics
| Core Processor | 32-bit ColdFire V1 |
| Core Size | 32-bit |
| Maximum CPU Frequency | 50.33 MHz (above 2.4 V); 40 MHz above 2.1 V; 20 MHz above 1.8 V |
| Flash Memory | 128 KB |
| Operating Supply Voltage | 2.5 V / 3.3 V |
| Performance | 0.94 Dhrystone MIPS/MHz |
| ADC Resolution | 12-bit |
| ADC Channels | 24 |
| Package | 80-pin LQFP (QFP 80) |
| Mounting Type | Surface Mount |
| Packaging | Tray |
| Product Family | MCF51QE (Flexis QE series) |
| Lifecycle Status | End of Life (per NXP product page) |
| Data Sheet Revision | Rev. 7 (MCF51QE128 Series Data Sheet) |
MCF51QE128CLK 80-pin lqfp (qfp 80) Pin Configuration Guide
Pin configuration for MCF51QE128CLK (80-pin lqfp (qfp 80) 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 MCF51QE128CLK.
Refer to the datasheet for full pin configuration.
Typical Applications
MCF51QE128CLK is suitable for 6 applications: Industrial Control Systems, Motor Control Boards, Consumer Appliance Control, Sensor Interface and Data Acquisition, Building Automation and Lighting Control, Legacy Embedded System Maintenance.
Industrial Control Systems
The MCF51QE128CLK fits factory automation nodes that need deterministic 32-bit control plus broad analog sensing: its 24-channel 12-bit ADC can digitize limit switches, potentiometers, and temperature sensors without external multiplexers, while the 50.33 MHz ColdFire V1 core executes PID control loops with ample headroom over 8-bit devices. In a typical topology the MCU reads analog inputs through the integrated ADC, drives relays or actuators via GPIO and timers, and communicates over UART or SPI to a supervisory PLC. Because the Flexis QE series pairs pin-compatible 8-bit and 32-bit devices, a control board can start on an 8-bit QE sibling and upgrade to this part with no PCB change, de-risking migration.
Recommended
Motor Control Boards
Motor drives benefit from the MCF51QE128CLK's combination of 12-bit analog acquisition and 32-bit arithmetic throughput. The 24-channel ADC can sample phase currents and bus voltage at 12-bit resolution, while the ColdFire V1 core at up to 50.33 MHz (above 2.4 V) computes field-oriented or trapezoidal commutation in software. Timer peripherals generate PWM outputs with hardware support, reducing CPU interrupt load. Running from a 3.3 V rail keeps logic compatible with common gate-driver and sensor levels. Estimated: at 0.94 Dhrystone MIPS/MHz, the core delivers roughly 47 MIPS at full clock, sufficient for multi-kHz current-loop control in small motor applications. Note that this part is EOL, so new motor-control designs should target an active NXP MCU family.
Recommended
Consumer Appliance Control
Appliances such as cooktops, HVAC controllers, and small home machines demand low system cost, flash configurability, and multi-sensor monitoring - all met by the MCF51QE128CLK in one chip. The 128 KB flash stores user interfaces, fault logs, and communication stacks, while the integrated ADC reads thermistors and user controls directly. The 80-pin LQFP supplies ample GPIO for seven-segment displays, relays, and touch or button inputs, minimizing external logic. Its 2.5 V/3.3 V operation simplifies power-tree design in cost-sensitive products. The Flexis architecture also allows an 8-bit QE variant to be substituted for cost-optimized SKUs on the identical PCB, letting one board serve multiple product tiers without a respin.
Recommended
Sensor Interface and Data Acquisition
Multi-channel data acquisition is a natural fit: the integrated 24-channel, 12-bit ADC digitizes up to two dozen sensor inputs with 4096-count resolution, eliminating external analog front-end multiplexers. The 128 KB flash buffers configuration tables, calibration coefficients, and firmware for protocol conversion, while the ColdFire V1 core performs averaging, filtering, and linearization in software at up to 50.33 MHz. Typical usage places the MCU as a bridge between raw analog sensors and a digital backhaul such as UART, SPI, or I2C to a gateway. Designers should budget sampling time across channels, since a single ADC shared by 24 inputs constrains per-channel rate; multiplexed sampling suits slow process variables rather than high-speed vibration analysis.
Recommended
Building Automation and Lighting Control
Building controllers need many I/O points, moderate compute, and long product availability - the 80-pin LQFP package of the MCF51QE128CLK provides the GPIO density for relay banks, dimming outputs, keypads, and sensor busses on a single controller. The 12-bit ADC reads occupancy, temperature, and light-level sensors, while UART/SPI/I2C interfaces connect to DALI-style or RS-485 style field busses through external transceivers. The 128 KB flash accommodates scheduling engines, communication stacks, and OTA-style field update loaders with room to spare. Since the part is End of Life, integrators maintaining installed fleets should secure stock now and plan a footprint-compatible or redesign migration to an active NXP MCU family for future product revisions.
Recommended
Legacy Embedded System Maintenance
A primary real-world use of the MCF51QE128CLK today is sustaining existing products whose firmware and PCB were designed around the Flexis QE family. Because the part is EOL, maintenance engineers use this page to source remaining distributor inventory - Eiyu lists over 8000 units ready to ship - and to identify drop-in family substitutes such as the MCF51QE64 for lower-memory board variants. In a typical repair or small-batch production scenario, the same footprint accepts any QE-series 80-pin LQFP member, allowing firmware-matched substitution without respinning the PCB. We recommend qualifying each substitute against the original firmware's flash, RAM, and peripheral requirements, and documenting an end-of-life migration plan to an active NXP device family.
Recommended
Recommended Products Summary
Engineering reference data for MCF51QE128CLK — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MCF51QE128VLK | MCF51QE64CLK | MCF51JE128VLK | MCF51MM128VLK |
|---|---|---|---|---|---|
| Package | 80-LQFP | 80-LQFP - same | 80-LQFP - same | 80-LQFP - same | 80-LQFP - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Flash Memory | 128 KB | 128 KB | 64 KB | 128 KB | 128 KB |
| Core / Max Clock | ColdFire V1 / 50.33 MHz | ColdFire V1 / 50.33 MHz | ColdFire V1 / 50.33 MHz | ColdFire V1 / 50.33 MHz | ColdFire V1 / 50.33 MHz |
| Key Differentiator | EOL; full 128 KB QE flagship in LQFP-80 | Extended temperature/packaging option | Lower flash/cost variant | USB-centric Flexis JE family | Signal-conditioning-centric Flexis MM family |
| Lifecycle Status | End of Life | EOL | EOL | EOL | EOL |
Key Differentiators
- Full 128 KB flash in the QE family LQFP-80 package (vs MCF51QE64CLK)
- Flexis 8/32-bit pin compatibility (vs MCF51QE128VLK and 8-bit QE siblings)
- Voltage-scaled clock up to 50.33 MHz (vs MCF51QE64CLK)
Design Notes
The maximum CPU frequency is supply-voltage dependent: 50.33 MHz requires VDD above 2.4 V, 40 MHz above 2.1 V, and 20 MHz above 1.8 V per the MCF51QE128 Series data sheet. Configure the clock generator (FLL multiplier) so the system clock never exceeds the limit for the actual rail voltage, including brownout dips. For designs targeting 50 MHz, power from a regulated 3.3 V rail with local 100 nF decoupling at each supply pin plus a bulk 10 uF capacitor.
The MCF51QE128CLK is End of Life per the NXP product page. Do not start new designs on this part. For sustaining production, qualify the pin-compatible MCF51QE64 (verify your firmware fits 64 KB flash) or the VLK temperature-grade variant of the same die. For new designs, NXP's Kinetis ARM Cortex-M family is the supported migration path but requires a PCB redesign. Confirm flash and RAM requirements of your firmware image before selecting any substitute.
The 80-pin LQFP has 0.5 mm pin pitch; use a fine-pitch soldering process and inspect for bridging under magnification. Provide generous analog grounding around the ADC input pins to preserve 12-bit performance - route analog traces away from fast clock and PWM nets, and use a single solid ground plane where possible. Decouple VDDA separately from VDD with an RC or ferrite filter to reduce digital noise coupling into the 24-channel ADC.
Compliance Information
Compliance data not present in the retrieved web data; verify on the NXP product page for MCF51QE128CLK (Environmental Quality section).
