MCF51MM128CMB - 32-bit ColdFire V1 MCU, 50MHz, 128KB Flash | NXP
MPN: MCF51MM128CMB ✓ Active| 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 |
MCF51MM128CMB Overview
A microcontroller (MCU) is an integrated circuit that combines a CPU, memory, and programmable I/O peripherals on a single die, allowing embedded systems to sense, compute, and actuate in real time. The MCF51MM family belongs to the broader 32-bit ColdFire hierarchy (ColdFire V1 -> ColdFire -> Freescale/NXP 32-bit MCU -> microcontroller -> embedded IC) and is positioned for ultra-low-power, mixed-signal applications. Compared with traditional 8-bit MCUs, the ColdFire V1 brings 32-bit arithmetic performance at modest power and code-size cost, while preserving deterministic interrupt behavior.
Key specifications include 128 KB (128K x 8) of embedded Flash, 32 KB of SRAM, a 50 MHz maximum CPU clock, and 48 user I/O pins. The 81-MAPBGA is a 10x10 mm laminate-based BGA that supports dense PCB escape routing for high-I/O, compact meter designs. Operating voltage is typically 2.5 V to 3.3 V, with the part offered in tray packaging for production assembly lines. The integrated ColdFire V1 core, USB device support, and on-chip analog peripherals remove the need for many external components.
The MCF51MM128CMB is designed for ultra-low-power operation with multiple Stop and Wait modes that reduce quiescent current during metrology idle periods. The 32-bit datapath handles fractional arithmetic commonly used in metering DSP routines (RMS, power factor, energy accumulation) without firmware overload. An internal oscillator infrastructure and an external oscillator option provide the clocking flexibility needed across metering, industrial, and consumer-grade design platforms.
Typical applications include single-phase and multi-phase electricity meters, smart e-meters with LCD/LED display, portable data loggers, low-cost industrial controllers, and USB-tethered measurement accessories. The combination of low power, mixed-signal integration, and a 50 MHz ColdFire V1 core is well suited to handheld metering designs that require both metrology accuracy and a human-machine interface.
When integrating the MCF51MM128CMB, follow reference design decoupling: at minimum a 0.1 µF ceramic and a bulk capacitor on each VDD/VBAT rail, placed as close to the BGA balls as the breakout allows. Because this is a BGA package, use a 4-layer PCB stack-up with via-in-pad or microvia fan-out for proper thermal relief and signal escape; keep analog routing short to avoid injecting noise into measurement ADC inputs. Respect the soldering profile for moisture-sensitive MSL-level handling per the manufacturer datasheet.
This page consolidates distributor pricing, drop-in same-family alternatives, and practical PCB layout guidance not assembled in the manufacturer datasheet.
Drop-in alternatives for MCF51MM128CMB — 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 MCF51MM128CMB (same form factor and footprint) — differing in Core Architecture, Mounting Type, RAM Size, Supply Voltage.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MCF51MM256CMB
✅ Drop-In✓ In Stock
$7.4 / Unit
View Datasheet →MCF51MM64CMB
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MCF51MM128CMB Maximum Ratings & Electrical Characteristics
| Core Architecture | ColdFire V1 RISC 32-bit |
| Family | MCF51MM |
| Program Memory Type | FLASH |
| Program Memory Size | 128 KB (128K x 8) |
| RAM Size | 32 KB |
| Maximum CPU Frequency | 50 MHz |
| Number of I/O | 48 |
| Package / Case | 81-MAPBGA (10x10 mm) |
| Mounting Type | Surface Mount (BGA) |
| Supply Voltage | 2.5 V / 3.3 V |
| Oscillator Type | External |
| Packaging | Tray |
MCF51MM128CMB 81-mapbga (10x10 mm) Pin Configuration Guide
Pin configuration for MCF51MM128CMB (81-mapbga (10x10 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 MCF51MM128CMB.
Refer to the datasheet for full pin configuration.
Typical Applications
MCF51MM128CMB is suitable for 7 applications: Single-Phase Electricity Meter, Multi-Phase Smart Meter with LCD/LED Display, Portable Industrial Data Logger, USB-Tethered Measurement Accessory, Low-Cost Industrial Controller with HMI, Healthcare Metering / Diagnostic Device, Smart Home Sensor Hub.
Single-Phase Electricity Meter
The MCF51MM128CMB serves as the metrology MCU in single-phase electricity meters where its ColdFire V1 32-bit core executes fractional RMS, active/reactive power, and energy accumulation algorithms. The 128 KB Flash accommodates metrology firmware plus a basic HMI LCD/LED stack, while 32 KB SRAM provides buffers for sample-rate ADC input and accumulation registers. Operating at 50 MHz with multiple Stop/Wait low-power modes, the part supports tamper-event logging during line outage without rapidly draining the backup super-cap or battery.
Recommended
Multi-Phase Smart Meter with LCD/LED Display
In multi-phase smart meters and advanced metering infrastructure (AMI) nodes, the MCF51MM128CMB drives a segmented LCD/LED display alongside current/voltage sense processing. The 48 I/O lines support LCD segment drivers, communication isolators, and tamper-switch inputs simultaneously without external expanders. Its 81-MAPBGA (10x10 mm) gives designers extra ball escape routes for EMI-sensitive analog measurement traces, while 2.5 V/3.3 V operation permits direct interface to metrology ADC front-ends and PLC line drivers.
Recommended
Portable Industrial Data Logger
The MCF51MM128CMB operates in portable industrial data loggers where its 128 KB Flash stores firmware and configuration while 32 KB SRAM buffers instantaneous sensor measurements during acquisition bursts. ColdFire V1's deterministic interrupt latency is reliable for time-stamped acquisition at consistent intervals, and the external oscillator option lets designers meet long-term drift specifications. The 81-MAPBGA package suits compact handheld enclosures, while low-power Wait/Stop modes extend battery operation across multi-week deployment cycles.
Recommended
USB-Tethered Measurement Accessory
Because the MCF51MM family integrates USB device connectivity, the MCF51MM128CMB fits USB-tethered measurement accessories used for diagnostics, calibration upload, or PC-side data visualization. The 50 MHz CPU handles USB bulk transfers and on-board preprocessing without bottlenecks, and the 48 I/O pins drive external sensor multiplexers and status LEDs. 2.5 V/3.3 V supply matches common USB-powered bus-powered device architectures, and the BGA package's short trace lengths cut EMI on high-speed USB lines.
Recommended
Low-Cost Industrial Controller with HMI
The MCF51MM128CMB functions as the supervisor in low-cost industrial controllers with keypads, character LCDs, and indicator LEDs. Its 48 I/O cover encoder quadrature inputs, relay outputs, and serial bridges to peripheral drivers. The 128 KB Flash carries control-loop firmware plus a small menu/UI state machine, and the 50 MHz ColdFire V1 executes 32-bit math for PID-style controllers and sequence logic without external DSP assistance. Tray packaging supports automated SMT on high-volume industrial lines.
Recommended
Healthcare Metering / Diagnostic Device
In compact handheld healthcare metering or diagnostic instruments, the MCF51MM128CMB acts as the central MCU, leveraging 32-bit math for sensor linearization and 128 KB Flash for device firmware and calibration curves. The ultra-low-power Run/Stop modes let the device sleep between readings, extending battery life across patient or clinician shifts. The 81-MAPBGA (10x10 mm) fits handheld enclosures where small form factor and high pin density reduce mechanical design iterations for OEM medical products.
Recommended
Smart Home Sensor Hub
The MCF51MM128CMB can serve as a smart-home sensor hub aggregating inputs from temperature, occupancy, and utility meters via I/O and serial interfaces. Its low-power modes enable wall-powered always-on operation without heat dissipation concerns, while 128 KB Flash stores both sensor-fusion logic and home automation protocol stacks. The BGA package supports compact PCB modules that fit behind wall switches or inside meter-base enclosures.
Recommended
Recommended Products Summary
Engineering reference data for MCF51MM128CMB — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MCF51MM256CMB | MCF51MM64CMB | MCF51MM128VMB |
|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 81-MAPBGA (10x10 mm) | 81-MAPBGA (10x10 mm) - same | 81-MAPBGA (10x10 mm) - same | LQFP-81 - different package |
| Core / Architecture | ColdFire V1 (32-bit) | ColdFire V1 (32-bit) | ColdFire V1 (32-bit) | ColdFire V1 (32-bit) |
| Max CPU Frequency | 50 MHz | 50 MHz | 50 MHz | 50 MHz |
| Flash Memory | 128 KB | 256 KB (+100%) | 64 KB (-50%) | 128 KB (same) |
| Supply Voltage | 2.5 V / 3.3 V | 2.5 V / 3.3 V | 2.5 V / 3.3 V | 2.5 V / 3.3 V |
| Oscillator | External | External | External | External |
Key Differentiators
- Doubled Flash with identical footprint (vs MCF51MM256CMB)
- Larger Flash for metrology plus HMI in same package (vs MCF51MM64CMB)
- Denser 10x10 BGA vs LQFP for compact meters (vs MCF51MM128VMB)
Design Notes
Estimated: the 81-MAPBGA (10x10 mm) with 48 user I/O requires 4-layer stack-up and via-in-pad fan-out for reliable signal escape. Place a 0.1 µF decoupling cap and a 4.7 µF bulk cap on each VDD/VBAT ball within 5 mm of the via pad. Keep analog ADC traces short and away from high-speed I/O to prevent metrology noise injection into measurement inputs.
Estimated: at 50 MHz CPU clock and typical 2.5-3.3 V operation, the BGA junction-to-ambient thermal resistance must be checked against the manufacturer's package thermal model. For tray-packaged surface-mount BGA production, follow the manufacturer-specified reflow profile with peak temperature below MSL rating. Use thermal vias under the central thermal ball array to spread heat into inner copper planes.
Estimated: leverage the Run, Wait, and Stop low-power modes to reduce quiescent current to single-digit µA during metering idle periods. Sequence IO peripheral clocks off when subsystems enter Wait to avoid spurious current draw. Document the wakeup source for Stop mode (LVD, RTC, IRQ) so firmware initializes the appropriate clock tree on resume.
Compliance Information
Compliance status (RoHS, REACH, lead-free, halogen-free) was not surfaced in the verified web data; marking the fields as 'unknown' until they can be verified from the manufacturer datasheet or NXP product page. AEC-Q100 is not applicable - this is a metering/industrial MCU.