MK21FX512VLQ12 - 120MHz Cortex-M4 MCU 512KB | NXP
MPN： MK21FX512VLQ12 ✗ 停產MK21FX512VLQ12 概覽
A microcontroller unit (MCU) is a single-chip embedded processor that integrates a CPU core, memory arrays, and a rich set of peripherals on one die, sitting within the broader hierarchy of semiconductor devices as a system-on-chip for embedded control. Unlike a general-purpose processor, an MCU executes dedicated firmware for real-time control, sensing, and connectivity tasks in a power-efficient manner.
Key features of the MK21FX512VLQ12 include hardware cryptography and tamper detection for security-sensitive designs, a USB full-/low-speed On-The-Go controller with on-chip transceiver and device charger-detect capability, and a floating-point unit inherited from the Cortex-M4 core for efficient DSP and motor-control mathematics.
The communication peripheral set comprises two SPI modules, two I2C modules, four UART modules, and an I2S audio interface, enabling multi-bus system designs without external expanders. Analog integration covers high-speed ADCs and comparators per the K21 sub-family datasheet, and flexible clocking supports low-power operation targets typical of cost-sensitive industrial applications.
Typical applications include industrial automation and control nodes, IoT edge devices, robotics controllers, consumer appliances, and secure portable equipment where the anti-tamper and hardware encryption engine reduces bill-of-materials cost for security.
Design consideration: as this device is listed NRND (Not Recommended for New Designs) by NXP, new designs should evaluate pin-compatible successors or confirm long-term supply before committing; the 144-LQFP requires careful decoupling of the multiple VDD/VSS pairs per the manufacturer datasheet.
This page synthesizes distributor listings, lifecycle status, drop-in alternatives, and practical design guidance not found in the manufacturer datasheet alone, with pricing verified as of 2026-10-18.
直接替換替代品，適用於 MK21FX512VLQ12 — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： MK21FX512VLQ12 （相同外形與佔位） — 差異在於 Mounting Type, Package.
MK21FX512VLQ10
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
MK21FN1M0VLQ12
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →MK21DX256VLQ5
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
MK21DN512VLQ5
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
MK22FX512VLQ12
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
MK21FX512VLQ12 最大額定值與電氣特性
| Core Processor | ARM Cortex-M4 (Cortex-M4F) |
| Core Size | 32-bit |
| 最大時脈頻率 | 120 MHz |
| Program Memory Size | 512 KB (512K x 8) Flash |
| FlexMem Size | 128 KB (configurable flash/EEPROM) |
| RAM Size | 128 KB |
| 封裝 | 144-LQFP (20 x 20 mm) |
| 安裝類型 | Surface Mount |
| USB Controller | USB full-/low-speed OTG with on-chip transceiver and charger detect |
| SPI Modules | 2 |
| I2C Modules | 2 |
| UART Modules | 4 |
| I2S Module | 1 |
| Security Features | Hardware encryption, tamper detection |
| MSL 等級 | 3 (168 Hours) |
| HTSUS Code | 8542.31.0001 |
| REACH Status | REACH Unaffected |
| Product Family | Kinetis K21 120 MHz (K21F sub-family) |
MK21FX512VLQ12 144-lqfp (20 x 20 mm) 腳位配置指南
MK21FX512VLQ12（144-lqfp (20 x 20 mm) 封裝）的腳位配置。 此數位 IC 包含 GPIO、通訊介面（UART、SPI、I2C）與電源腳位。替代腳位功能與配置選項請參閱製造商資料表。對嵌入式系統設計與 PCB 佈局至關重要。
無詳細腳位定義資料： MK21FX512VLQ12.
請參閱 資料表 以查看完整腳位配置。
典型應用
MK21FX512VLQ12 適用於 6 應用s: Industrial Automation and Control, IoT Edge Devices, Robotics Controllers, Secure Portable and Payment Devices, Consumer Appliances, Test and Measurement Equipment.
Industrial Automation and Control
The MK21FX512VLQ12 fits industrial control nodes where its 120 MHz Cortex-M4 with hardware FPU executes PID and field-oriented control loops deterministically, while four UARTs and two SPI modules link drives, sensors, and HMIs. The 128 KB SRAM buffers communication stacks and logging data, and industrial operating ratings support factory-floor environments. Designers should note the NRND status and plan migration paths for long-lifetime industrial programs; existing control boards benefit from the rich K21 peripheral mix without external interface chips.
推薦
IoT Edge Devices
For IoT edge nodes, the MK21FX512VLQ12 combines a 120 MHz core with low-power operating modes typical of the Kinetis K21 family, so sensor sampling, protocol translation, and local decision logic run efficiently. The 512 KB flash holds wireless connectivity stacks and OTA bootloader code, while 128 KB FlexMem emulates EEPROM for calibration and configuration storage. Hardware encryption offloads TLS-style cipher workloads from firmware. USB OTG simplifies commissioning and firmware updates in the field via a standard connector.
推薦
Robotics Controllers
Robotics motion controllers benefit from the MK21FX512VLQ12's 120 MHz Cortex-M4F floating-point core, which executes kinematics and servo loop mathematics in hardware rather than software emulation. Multiple SPI and UART channels coordinate encoders, motor drivers, and host links simultaneously, while high-speed ADCs sample current shunts for torque control. The 144-LQFP exposes ample GPIO for limit switches and safety interlocks. Its industrial portfolio heritage (Freescale Kinetis) provides mature toolchain and SDK support for robotics teams.
推薦
Secure Portable and Payment Devices
The K21F sub-family's differentiator is on-chip hardware encryption plus tamper detection, making the MK21FX512VLQ12 attractive for portable terminals, metering, and licensed equipment that must protect keys and firmware. The USB OTG controller with charger detect enables both data transfer and charging negotiation from one port, important in battery-powered handhelds. The 128 KB FlexMem stores transaction logs in emulated EEPROM with wear leveling. Its 120 MHz core keeps cryptographic and UI response times short without a second processor.
推薦
Consumer Appliances
Cost-sensitive appliance control boards use the MK21FX512VLQ12 for its balance of 120 MHz performance, generous 512 KB flash for UI frameworks and communication stacks, and integrated analog for temperature and current sensing. Four UARTs handle touch panels, Wi-Fi modules, and cloud gateways concurrently; I2C manages sensors and EEPROMs. The 144-LQFP package provides the I/O count for displays, relays, and keypad matrices in a single controller, reducing board-level component count versus multi-chip alternatives.
推薦
Test and Measurement Equipment
Bench instruments and data loggers exploit the MK21FX512VLQ12's high-speed ADCs, precise timing peripherals, and USB OTG port for PC connectivity. The 120 MHz Cortex-M4 with FPU performs calibration math, FFT-based analysis, and trigger logic in real time, while 128 KB SRAM sustains deep sample buffering. Two SPI modules stream results to displays or external converters, and I2S supports audio-band measurement front ends. The 144-pin LQFP delivers the pin count needed for multi-channel analog front ends on one controller.
推薦
推薦產品摘要
工程參考資料，適用於 MK21FX512VLQ12 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | MK21FX512VLQ10 | MK21FN1M0VLQ12 | MK21DX256VLQ5 | MK21DN512VLQ5 | MK22FX512VLQ12 |
|---|---|---|---|---|---|---|
| Package | 144-LQFP (20 x 20 mm) | 144-LQFP - same | 144-LQFP - same | 144-LQFP - same | 144-LQFP - same | 144-LQFP - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Core / Max Clock | Cortex-M4, 120 MHz | Cortex-M4, 100 MHz | Cortex-M4, 120 MHz | Cortex-M4, 100 MHz | Cortex-M4, 100 MHz | Cortex-M4, 120 MHz |
| Flash | 512 KB | 512 KB | 1 MB | 256 KB | 512 KB (split program/FlexNVM) | 512 KB |
| SRAM | 128 KB | 128 KB | 128 KB | 64 KB | 128 KB | 128 KB |
主要差異化特點
- Hardware encryption with tamper detection (對比MK21DX256VLQ5)
- Fastest K21 144-LQFP speed grade (對比MK21FX512VLQ10)
- Balanced memory without over-provisioning (對比MK21FN1M0VLQ12)
設計說明
The 144-LQFP (20 x 20 mm) exposes multiple VDD/VSS pairs that must each be decoupled with 100 nF ceramic capacitors placed within 2-3 mm of the pins, plus bulk capacitance near the regulator. Follow the power connection guidelines in the K21 technical data sheet (K21P80M50SF4 Rev. 4.1): keep VDDA/VSSA on a quiet analog island with an RC or ferrite filter from the digital rail to preserve ADC accuracy. Use 0.5 mm pitch escape routing and allow at least 4 mil trace/space.
This part is NRND per the NXP product page. Before releasing a new PCB revision around the MK21FX512VLQ12, confirm supply lifetime with NXP and arrange a last-time-buy buffer, or pre-qualify a drop-in K21 family variant (e.g., MK21FX512VLQ10 in the same 144-LQFP footprint). Also note the SWD/JTAG debug muxing and EZPORT boot modes: pull the appropriate boot configuration pins correctly at reset or the device may enter bootloader instead of executing flash code.
Estimated: at 120 MHz with all peripherals active, K21-family core current is typically in the tens of mA (verify exact IDD from the datasheet power tables for your configuration). At 3.3 V and ~50 mA, dissipation is ~0.17 W; the 144-LQFP theta_JA of roughly 40-50 C/W over a standard JEDEC 4-layer board yields only ~8 C junction rise, so no heatsink is required. Ensure your board follows the datasheet-recommended thermal pad/via pattern if operating at the top of the industrial temperature range.
合規資訊
REACH status: REACH Unaffected (per Rochester Electronics listing). HTSUS: 8542.31.0001. RoHS/lead-free status not stated in provided data - verify on NXP product page.