MK21FX512VMC12-FR - 120MHz Cortex-M4 512KB MCU | NXP
MPN: MK21FX512VMC12-FR ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.0048 | $1.00 |
| 10 | $0.98 | $9.80 |
| 100 | $0.95 | $95.00 |
| 500 | $0.92 | $460.00 |
| 1,000 | $0.88 | $880.00 |
MK21FX512VMC12-FR Overview
A microcontroller (MCU) is a single integrated circuit that combines a processor core, non-volatile program memory, SRAM, and a rich suite of peripherals such as ADCs, timers, and communication interfaces. MCUs form the lowest tier of the embedded processing hierarchy, sitting below application processors and digital signal processors, and are the workhorse of embedded system design for industrial control, consumer products, and IoT nodes.
Key features of the Kinetis K21 family include hardware encryption with tamper detection for security-sensitive designs, a comprehensive analog and communication peripheral suite, and low-power operation targeted at cost-sensitive applications. The Cortex-M4 core with DSP instructions and an FPU accelerates control loops, digital filtering, and audio processing at 120 MHz clock speed.
Technically, the K21F series operates from supply voltages of 1.8V, 2.5V, or 3.3V and uses ARM's Cortex-M4 microarchitecture with Harvard bus structure. The 121-pin MAPBGA array minimizes board space and shortens interconnections, which improves signal integrity and supports compact 8x8 mm layouts with high peripheral integration.
Typical applications include industrial control and automation nodes, audio processing equipment, medical monitoring devices, and IoT gateways where hardware cryptographic acceleration and low power consumption are required.
When designing with this device, note the MSL 3 (168 hours) moisture sensitivity rating: the tray-packed BGA must be baked if floor-life exposure exceeds 168 hours before reflow.
This page synthesizes distributor pricing, drop-in same-family alternatives, compliance data, and practical design notes not found in a single manufacturer datasheet.
Drop-in alternatives for MK21FX512VMC12-FR — 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 MK21FX512VMC12-FR (same form factor and footprint) — differing in Package, Flash Memory, Supply Voltage.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MK21FX512VMC12
✅ Drop-In📋 Reference alternative (not in catalog)
MK21FX512VMD12
✅ Drop-In✓ In Stock
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View Datasheet →MK21FN1M0AVMC12
✅ Drop-In📋 Reference alternative (not in catalog)
MK21DX256VMC12
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MK21DN512VMC12
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MK21FX512VMC12-FR Maximum Ratings & Electrical Characteristics
| Core Processor | ARM Cortex-M4 |
| Core Size | 32-Bit |
| Maximum Clock Frequency | 120 MHz |
| Flash Memory | 512 KB (512K x 8) |
| Supply Voltage | 1.8V / 2.5V / 3.3V |
| Package | 121-MAPBGA (8x8 mm) |
| Mounting Type | Surface Mount |
| Series | Kinetis K21 (K21F) |
| FPU | Yes (Cortex-M4F) |
| Hardware Encryption | Yes |
| Tamper Detection | Yes |
| MSL Level | 3 (168 Hours) |
| Moisture Sensitivity Floor Life | 168 hours |
| Packaging | Tray |
| REACH Status | REACH Unaffected |
| HTSUS Code | 8542.31.0001 |
| Peripherals | Analog, communication, timing and control peripherals |
| Original Manufacturer | Freescale Semiconductor (now NXP Semiconductors) |
| Supply Source | Rochester Electronics authorized continuation (-FR suffix) |
MK21FX512VMC12-FR 121-mapbga (8x8 mm) Pin Configuration Guide
Pin configuration for MK21FX512VMC12-FR (121-mapbga (8x8 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 MK21FX512VMC12-FR.
Refer to the datasheet for full pin configuration.
Typical Applications
MK21FX512VMC12-FR is suitable for 6 applications: Industrial Control and Automation, Audio Processing Equipment, IoT Gateways and Sensor Nodes, Medical Monitoring Devices, Embedded Security and Access Control, Motor Control and Digital Power.
Industrial Control and Automation
Industrial control nodes benefit from the MK21FX512VMC12-FR's rich suite of analog, communication, and timing peripherals, which allow a single 120 MHz Cortex-M4 device to replace separate interface and control ICs. The hardware FPU accelerates PID control loops and digital filtering executed locally at the machine level, while multiple communication interfaces link PLC backplanes, motor drives, and HMI panels. In retrofit projects, the Rochester Electronics continuation supply keeps existing automation boards serviceable without redesign. A key consideration is the 1.8V/2.5V/3.3V supply architecture, which pairs naturally with 3.3V industrial logic while reducing I/O switching power versus 5V systems.
Recommended
Audio Processing Equipment
The 120 MHz Cortex-M4 with hardware FPU and DSP instructions makes the MK21FX512VMC12-FR well suited to digital audio paths: it can run I2S transports, sample-rate conversion, and audio effect processing in firmware. The compact 8x8 mm 121-ball MAPBGA keeps the controller footprint small on mixer, amplifier, and audio-interface PCBs where board area is constrained. Hardware encryption also protects licensed audio content streams. Designers should budget SRAM carefully, as audio buffering consumes the on-chip SRAM quickly; for large buffers, attach external memory via the available bus interfaces. Pair with a dedicated audio DAC and low-noise supply rails for best signal-to-noise performance.
Recommended
IoT Gateways and Sensor Nodes
IoT gateways require local intelligence, secure communications, and low idle power - three areas where the MK21FX512VMC12-FR fits. The 120 MHz core handles protocol stacks and edge preprocessing, while built-in hardware encryption and tamper detection secure firmware and credentials without the cost of a separate secure element. The Kinetis low-power modes reduce average consumption in battery-buffered sensor aggregators. The 512 KB flash accommodates a bootloader plus a full application with room for OTA update images in dual-bank schemes. Designers should validate antenna-adjacent routing on the BGA footprint and verify the 3.3V rail sequencing during cold start to avoid brownout resets.
Recommended
Medical Monitoring Devices
Portable medical monitors - vital-sign recorders, patient-worn sensors, and diagnostic peripherals - need a compact, low-power MCU with dependable data integrity. The MK21FX512VMC12-FR's hardware encryption protects patient data at rest, its tamper detection guards physical access to sensitive interfaces, and the Cortex-M4 FPU accelerates bio-signal algorithms such as filtering and feature extraction. The 121-ball 8x8 mm BGA supports small wearable form factors. Because the device is EOL with continuation supply through Rochester Electronics, medical product teams should lifetime-buy for the remaining service life of their platform or qualify an active Kinetis successor in the same footprint. Pair precision delta-sigma conversion for physiological signal chains.
Recommended
Embedded Security and Access Control
Security-centric applications - access control panels, encrypted data loggers, and point-of-sale terminals - exploit the K21F hardware encryption engine and tamper detection directly, offloading symmetric cryptography from software and enabling secure key storage behavior. The 120 MHz core sustains authentication protocols and network stacks concurrently, and the 512 KB flash holds firmware plus certificates with room to spare. Using the -FR continuation supply keeps certified legacy designs in production without requalification of a new MCU. Designers should route tamper-detect lines on inner PCB layers with guarding, and confirm that the crypto peripheral configuration matches the Kinetis K21 family reference manual for the exact security feature set.
Recommended
Motor Control and Digital Power
The Cortex-M4 DSP instructions and hardware FPU let the MK21FX512VMC12-FR execute field-oriented control (FOC) for BLDC and PMSM motors at 120 MHz with headroom for supervisory logic. On-chip timing peripherals generate complementary PWM with dead-time insertion, while fast analog channels sample phase currents for closed-loop control. This suits pumps, fans, small servo drives, and digital power supplies where cost targets preclude dedicated motor-control DSPs. The 3.3V I/O domain simplifies interfacing with gate-driver ICs. Engineers must keep the high-current gate-drive loops physically separated from MCU sensing traces on the BGA fanout layer and verify ADC sampling timing against the PWM period for accurate current reconstruction.
Recommended
Recommended Products Summary
Engineering reference data for MK21FX512VMC12-FR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MK21FX512VMC12 | MK21FX512VMD12 | MK21FN1M0AVMC12 | MK21DX256VMC12 | MK21DN512VMC12 |
|---|---|---|---|---|---|---|
| Package | 121-MAPBGA (8x8 mm) | 121-MAPBGA (8x8 mm) - same | 121-MAPBGA (8x8 mm) - same | 121-MAPBGA (8x8 mm) - same | 121-MAPBGA (8x8 mm) - same | 121-MAPBGA (8x8 mm) - same |
| Brand | NXP Semiconductors (orig. Freescale, Rochester -FR) | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Core / Frequency | Cortex-M4, 120 MHz | Cortex-M4, 120 MHz | Cortex-M4, 120 MHz | Cortex-M4, 120 MHz | Cortex-M4, 120 MHz | Cortex-M4, 120 MHz |
| Flash Memory | 512 KB | 512 KB | 512 KB | 1 MB | 256 KB | 512 KB (FlexNVM/Dflash architecture) |
| Supply Voltage | 1.8V / 2.5V / 3.3V | 1.8V / 2.5V / 3.3V | 1.8V / 2.5V / 3.3V | 1.8V / 2.5V / 3.3V | 1.8V / 2.5V / 3.3V | 1.8V / 2.5V / 3.3V |
| Hardware Encryption / Tamper | Yes | Yes | Yes | Yes | Yes | Yes |
| Lifecycle / Supply Channel | EOL - Rochester Electronics continuation (-FR) | EOL - remaining NXP channel stock | EOL - remaining stock / cross-reference | EOL - remaining stock | EOL - remaining stock | EOL - remaining stock |
Key Differentiators
- Doubled flash in the same footprint (vs MK21FN1M0AVMC12)
- Authorized continuation supply security (vs MK21FX512VMC12)
- Cost-optimized memory point (vs MK21DX256VMC12)
- Honest trade-off: EOL lifecycle (vs MK21FX512VMD12)
Design Notes
The 121-ball MAPBGA at 8x8 mm requires controlled-impedance fanout; typical ball pitch on this package allows via-in-pad or dog-bone escape with 0.1 mm microvias on a 4+ layer stack. Follow the NXP Kinetis K21 hardware design application guidance for power-plane segmentation of the 1.8V/2.5V/3.3V domains. Route the fast bus and crystal traces on inner layers with adjacent ground planes to protect signal integrity at 120 MHz operation.
This part is MSL 3 (168 hours): once the moisture-barrier bag is opened, floor life before reflow is limited to 168 hours. Tray-packed Rochester continuation units may carry older date codes - bake before reflow if exposure history is unknown, per standard SMT practice. Also confirm firmware flash-allocation maps before substituting the 1 MB MK21FN1M0AVMC12 or the 256 KB MK21DX256VMC12, as linker scripts assume the 512 KB map.
Supply the device from a regulated 3.3V rail (1.8V and 2.5V operation are supported per the datasheet but 3.3V is the standard configuration). Decouple each VDD ball with 0.1 uF ceramics placed within 2 mm of the ball via, plus bulk 10 uF per domain. Verify power-up ramp rate and rail sequencing against the Kinetis K21 family reference manual to avoid brownout during cold start, especially in battery-powered nodes.
If using the hardware encryption and tamper detection features, route tamper-detect mesh lines on inner PCB layers with guarding, and keep the crystal and oscillator traces short and shielded. This preserves the integrity of the physical security boundary the K21F was designed for and avoids false tamper events from crosstalk on densely routed security lines.
Compliance Information
REACH status listed as REACH Unaffected; HTSUS 8542.31.0001 per Rochester Electronics datasheet record. RoHS and lead-free status not stated in provided data - confirm with Rochester Electronics documentation.
