MK12DX128VLF5557 - 50MHz Cortex-M4 MCU 128KB Flash | NXP
MPN: MK12DX128VLF5557 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.95 | $7.95 |
| 10 | $7.16 | $71.60 |
| 100 | $6.36 | $636.00 |
| 500 | $5.72 | $2,860.00 |
| 1,000 | $5.08 | $5,080.00 |
MK12DX128VLF5557 Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, memory (Flash/RAM), peripherals, and I/O into one device, sitting at the taxonomy level of: microcontroller -> microprocessor -> integrated circuit -> semiconductor. Kinetis K-series MCUs are general-purpose Cortex-M devices aimed at industrial and consumer embedded designs, where deterministic real-time control, low power, and rich analog integration matter most.
Key features of the MK12DX128VLF5557 include the ARM Cortex-M4 core with DSP instructions, 128 KB program Flash for application code, a 48-pin LQFP package supporting surface-mount assembly and standard hand-solder rework, and Freescale/NXP legacy Kinetis tooling. The 50 MHz CPU clock is suitable for sensor fusion, motor control loops, and human-machine interface (HMI) applications, while the Flash density supports mid-sized embedded applications with Bluetooth stacks or graphics libraries.
Architecturally, the K12 sub-family uses the Cortex-M4 with a 3-stage pipeline, single-precision FPU, and Memory Protection Unit (MPU), paired with Kinetis peripheral IP including FlexTimer, ADC, and low-power modes. The 48-LQFP (7x7) package offers a manageable pin pitch for hand prototyping while exposing the full peripheral set.
Typical applications include industrial sensor nodes, low-end motor control, building automation, and consumer HMI panels. The K12 family is also seen in smart metering and access-control designs where 128 KB Flash fits the firmware image.
When designing with this part, verify the specific peripheral mix against your firmware's I/O requirements (UART, I2C, SPI, timers, ADC channels) and confirm the 48-LQFP footprint is acceptable for the mechanical enclosure. Note that some K12 Kinetis parts have transitioned through NXP's product lifecycle; sourcing from authorized distributors like Rochester Electronics mitigates supply-chain risk.
This page synthesizes distributor pricing, authorized-channel availability, and pin-compatible Kinetis alternatives not found in the manufacturer datasheet alone, helping engineers evaluate substitution paths for legacy Kinetis K12 designs.
Drop-in alternatives for MK12DX128VLF5557 — 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 MK12DX128VLF5557 (same form factor and footprint) — differing in Core, Core Architecture, Program Memory Size, Series.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MK12DX128VLF5
✅ Drop-In📋 Reference alternative (not in catalog)
MK22DX256VLF5
✅ Drop-In✓ In Stock
$5.38 / Unit
View Datasheet →MKV30F64VLF10
✅ Drop-In✓ In Stock
$3.42 / Unit
View Datasheet →MK12DX128VLF5557 Maximum Ratings & Electrical Characteristics
| Manufacturer | NXP Semiconductors (formerly Freescale) |
| Series | Kinetis K12 |
| Core Architecture | ARM Cortex-M4 |
| Core Count | Single-Core |
| Data Bus Width | 32-bit |
| CPU Max Frequency | 50 MHz |
| Program Memory Type | FLASH |
| Program Memory Size | 128 KB (128K x 8) |
| Package | 48-LQFP (7x7 mm) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Lead Free | Yes |
MK12DX128VLF5557 48-lqfp (7x7 mm) Pin Configuration Guide
Pin configuration for MK12DX128VLF5557 (48-lqfp (7x7 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 MK12DX128VLF5557.
Refer to the datasheet for full pin configuration.
Typical Applications
MK12DX128VLF5557 is suitable for 6 applications: Industrial Sensor Node, Low-End Motor Control, Building Automation Controller, Consumer HMI Panel, Smart Metering Endpoint, Access Control Reader.
Industrial Sensor Node
The MK12DX128VLF5557 fits industrial sensor nodes because its ARM Cortex-M4 core at 50 MHz runs digital filters and sensor-fusion algorithms within the 128 KB Flash budget, while the 48-LQFP (7x7) package is compatible with hand-prototyping and standard SMT lines. With on-chip ADC and Kinetis timers, it can sample multiple analog sensors, run a control loop, and publish results over UART/CAN. Compared to a switching-based design, the Cortex-M4 integrates DSP extensions that handle FIR/IIR filtering without a coprocessor, reducing BOM cost and PCB area. Place it on a 4-layer PCB with decoupling caps within 5 mm of each power pin for clean analog reads in electrically noisy industrial environments.
Recommended
Low-End Motor Control
For low-end brushed DC or stepper motor control the MK12DX128VLF5557's 50 MHz Cortex-M4 executes PWM generation, commutation logic, and current sensing in a single chip without an external DSP. The 128 KB Flash fits a 6-step commutation table plus speed PI loop, while the 48-LQFP package exposes enough GPIO for three-phase PWM, hall-sensor inputs, and fault pins. Kinetis FlexTimer peripherals allow precise center-aligned PWM with dead-time insertion, critical for half-bridge drivers. Estimate: at 48 MHz system clock the Cortex-M4 sustains ~50 MIPS, leaving headroom for a serial command interface alongside the motor control loop.
Recommended
Building Automation Controller
In building automation (HVAC, lighting, access control) the MK12DX128VLF5557 acts as a zone controller, running scheduling logic, keypad/display driving, and protocol stacks (Modbus, BACnet) within 128 KB Flash. Its Cortex-M4 DSP extensions accelerate the bit-manipulation routines common in communication stacks. The 48-LQFP (7x7 mm) package fits into small controller enclosures and supports hand rework for low-volume runs. Compared to a Cortex-M0+ design, the M4 provides faster protocol parsing with similar power consumption. Use the Kinetis low-power modes for battery-backed sensor applications in smart home ecosystems.
Recommended
Consumer HMI Panel
The MK12DX128VLF5557 suits consumer HMI panels (appliance UI, simple touch interfaces) because the Cortex-M4 runs LVGL/embedded graphics libraries within 128 KB Flash while leaving room for application logic. The 48-LQFP footprint fits behind the display panel and exposes enough GPIO for capacitive touch I2C, segment/character LCD, and rotary encoders. Kinetis peripherals provide PWM for LED backlight dimming and DMA-driven SPI for display refresh. Trade-off vs Cortex-M7: slower graphics rendering, but lower BOM cost and simpler PCB routing in the 7x7 mm LQFP land pattern.
Recommended
Smart Metering Endpoint
For electricity/water/gas metering endpoints the MK12DX128VLF5557 offers the Cortex-M4 DSP extensions to compute RMS voltage/current and active/reactive power in firmware, eliminating a dedicated metering ASIC. The 128 KB Flash holds DLMS/COSEM or wireless M-Bus protocol stacks while the 48-LQFP fits behind the meter's display. Kinetis low-power modes extend battery life in disconnected/off-grid smart-meter endpoints. The single-precision FPU accelerates power-quality math while keeping MCU power dissipation low.
Recommended
Access Control Reader
Access-control card readers benefit from the MK12DX128VLF5557's Cortex-M4 DSP, which accelerates cryptographic operations (AES, hashing) used in RFID/NFC and OSDP secure channels. The 128 KB Flash fits the secure-element firmware plus application logic, while 48-LQFP leaves room for RS-485, Wiegand, and buzzer/LED I/O. Kinetis timers handle precise Wiegand bit timing without jitter. Compared to M0+ designs, the M4 reduces transaction latency when running crypto libraries - meaningful at peak reader traffic.
Recommended
Recommended Products Summary
Engineering reference data for MK12DX128VLF5557 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MK12DX128VLF5 | MK22DX256VLF5 | MK22FX512AVLK12 | MKV30F64VLF10 |
|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 48-LQFP (7x7 mm) | 48-LQFP (7x7 mm) - same | 48-LQFP (7x7 mm) - same | 80-LQFP - different | 48-LQFP (7x7 mm) - same |
| Core | ARM Cortex-M4 | ARM Cortex-M4 | ARM Cortex-M4 | ARM Cortex-M4 | ARM Cortex-M4 |
| Max CPU Frequency | 50 MHz | 50 MHz | 50 MHz | 120 MHz | 50 MHz |
| Flash Memory | 128 KB | 128 KB | 256 KB | 512 KB | 64 KB |
| Pin Count | 48 | 48 | 48 | 80 | 48 |
| Family | Kinetis K12 | Kinetis K12 | Kinetis K22 | Kinetis K22 | Kinetis KV30 |
Key Differentiators
- K12 family balance of Flash density and 48-LQFP footprint (vs MK22FX512AVLK12)
- Same-family variant for drop-in replacements (vs MK12DX128VLF5)
- Direct K22 migration path on the same footprint (vs MK22DX256VLF5)
Design Notes
At 50 MHz with all peripherals active, the MK12DX128VLF5557 in 48-LQFP (7x7 mm) typically dissipates under 200 mW in normal embedded workloads. The exposed-pad-less LQFP has a modest theta_JA around 60-70 C/W; verify junction rise in enclosed enclosures. Estimated: at 25 C ambient and 150 mW dissipation, junction rises roughly 9-11 C - well within the industrial operating window. Forced airflow is rarely required at this power, but derate for ambient above 70 C.
Place 100 nF decoupling caps within 5 mm of every VDD pin and a bulk 4.7 uF tantalum or ceramic near the package. Route the SWD clock and SWDIO as short, impedance-controlled traces (50 ohm) and keep them at least 3x trace-width away from analog and PWM signals to avoid coupling. For noise-sensitive ADC applications, dedicate one VDD pin to analog supply and add a ferrite bead between digital and analog VDD rails.
Verify the exact peripheral mix against the K12 sub-family datasheet before committing layout: some K12 Kinetis parts disable peripherals or differ in timer/ADC channel count vs K10/K20. When migrating from MK12DX128VLF5557 to MK22DX256VLF5, confirm that all K12-only signals (FlexTimer channels, low-power pin wakeup) are remapped - the K22 die has a different peripheral mux. Lastly, source through authorized channels (Rochester Electronics, JLCPCB, DigiKey Marketplace) to avoid counterfeit Kinetis parts.
Compliance Information
RoHS and lead-free per NXP product page. Not AEC-Q100 qualified (general-purpose industrial/consumer). Halogen-free status not surfaced in distributor listings.