MK21DN512AVLK5 - 50MHz Cortex-M4 MCU, 512KB Flash | NXP
料号： MK21DN512AVLK5 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $7.2 | $7.20 |
| 10 | $6.55 | $65.50 |
| 100 | $5.9 | $590.00 |
| 500 | $5.35 | $2,675.00 |
| 1,000 | $4.8 | $4,800.00 |
MK21DN512AVLK5 概述
A microcontroller (MCU) is a single integrated circuit that combines a processor core, program memory, data memory, and a rich set of peripherals on one die, forming the lowest level of the embedded-computing hierarchy (microcontroller unit -> embedded processor -> semiconductor device). The Kinetis K21 sub-family targets applications that need both mainstream MCU control and USB connectivity in one chip, with the ARM Cortex-M4 core adding DSP instructions and single-cycle MAC for computationally demanding tasks.
Key features include the 50 MHz Cortex-M4 core with hardware floating-point-assist via DSP/MAC acceleration, 512 KB of on-chip flash with 64 KB of SRAM, an integrated full-speed USB OTG controller, hardware encryption and anti-tamper (DryIce) functionality, and a rich suite of analog (16-bit ADC, 12-bit DAC), communication (UART, SPI, I2C, CAN), timing, and control peripherals. Supply voltage spans 1.8 V, 2.5 V, and 3.3 V operating rails per Arrow and distributor listings.
Technically, the K21D sub-family belongs to NXP (formerly Freescale) Kinetis K-series built around the ARM Cortex-M4 with a crossbar bus architecture connecting multiple bus masters to flash, SRAM, and peripherals, reducing contention in USB-plus-control applications. The anti-tamper detection hardware makes the part suitable for secure equipment where physical attack detection is required, a differentiator versus generic M4 MCUs.
Typical applications include industrial automation control with USB field connectivity, secure building-access and payment terminals leveraging anti-tamper hardware, and medical/instrumentation devices needing 32-bit DSP-class processing with a compact 80-pin footprint. AEC-Q100 qualification (per Arrow product data) extends usage into automotive subsystems.
When designing with the MK21DN512AVLK5, budget the 64 KB SRAM carefully for USB buffers plus application state, and verify the flash programming algorithm matches the K21D family in your debugger/programmer configuration.
This page synthesizes distributor pricing, drop-in alternatives, design notes, and comparison data not found in the manufacturer datasheet, as of 2026-10-18.
直接替换替代料： MK21DN512AVLK5 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： MK21DN512AVLK5 （相同外形与封装尺寸） ——差异在于 Package, Series, USB, Core Architecture, Flash Memory.
快速对比工具——选择替代料号进行并排对比：
MK21DN512VLK5
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MK21DX256AVLK5
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$11 / 个
查看数据手册 →MK21DN128AVLK5
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MK20DX256VLK10
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$8.4 / 个
查看数据手册 →MK11DN512AVLK5
✅ 直接替换📋 参考替代料（不在目录中）
MK21DN512AVLK5 最大额定值与电气特性
| Core Processor | ARM Cortex-M4 |
| Core Size | 32-Bit |
| 最大时钟频率 | 50 MHz |
| Flash Memory | 512 KB (512K x 8) |
| SRAM | 64 KB |
| 电源电压 | 1.8 V / 2.5 V / 3.3 V |
| USB | Full-Speed USB 2.0 device/OTG controller |
| Security Features | Hardware encryption, anti-tamper detection (DryIce) |
| Peripherals | ADC, DAC, PWM, POR, WDT, DMA, CAN, UART, SPI, I2C |
| 工作温度 | -40C to +105C (AEC-Q100 grade, per Arrow data) |
| 封装 | 80-LQFP (12x12 mm) |
| 安装类型 | Surface Mount |
| Qualification | Automotive AEC-Q100 (per Arrow product listing) |
| Packaging | Tray |
| Product Family | Kinetis K21 (K21D sub-family) |
MK21DN512AVLK5 引脚配置
| 引脚 1 | PTE0 — GPIO / UART TX / SPI multiplexed pin |
| 引脚 2 | PTE1 — GPIO / UART RX / SPI multiplexed pin |
| 引脚 3 | PTE2 — GPIO multiplexed pin |
| 引脚 4 | PTE3 — GPIO multiplexed pin |
| 引脚 5 | PTE4 — GPIO multiplexed pin |
| 引脚 6 | PTE5 — GPIO multiplexed pin |
| 引脚 7 | VSS — Ground |
| 引脚 8 | VDD — Power supply |
| 引脚 9 | PTE6 — GPIO multiplexed pin |
| 引脚 10 | PTE7 — GPIO multiplexed pin |
| 引脚 11 | PTE8 — GPIO multiplexed pin |
| 引脚 12 | PTE9 — GPIO multiplexed pin |
| 引脚 13 | PTE10 — GPIO multiplexed pin |
| 引脚 14 | PTE11 — GPIO multiplexed pin |
| 引脚 15 | PTC0 — GPIO / UART / multiplexed pin |
| 引脚 16 | PTC1 — GPIO / UART / multiplexed pin |
| 引脚 17 | PTC2 — GPIO multiplexed pin |
| 引脚 18 | PTC3 — GPIO multiplexed pin |
| 引脚 19 | PTC4 — GPIO multiplexed pin |
| 引脚 20 | PTC5 — GPIO multiplexed pin |
| 引脚 21 | VREFH — ADC reference high |
| 引脚 22 | VREFL — ADC reference low |
| 引脚 23 | PTC6 — GPIO multiplexed pin |
| 引脚 24 | PTC7 — GPIO multiplexed pin |
| 引脚 25 | PTC8 — GPIO multiplexed pin |
| 引脚 26 | PTC9 — GPIO multiplexed pin |
| 引脚 27 | PTC10 — GPIO multiplexed pin |
| 引脚 28 | PTC11 — GPIO multiplexed pin |
| 引脚 29 | PTC12 — GPIO multiplexed pin |
| 引脚 30 | PTC13 — GPIO multiplexed pin |
| 引脚 31 | PTB0 — GPIO / ADC input multiplexed pin |
| 引脚 32 | PTB1 — GPIO / ADC input multiplexed pin |
| 引脚 33 | PTB2 — GPIO / ADC input multiplexed pin |
| 引脚 34 | PTB3 — GPIO / ADC input multiplexed pin |
| 引脚 35 | PTB4 — GPIO multiplexed pin |
| 引脚 36 | PTB5 — GPIO multiplexed pin |
| 引脚 37 | PTB6 — GPIO multiplexed pin |
| 引脚 38 | PTB7 — GPIO multiplexed pin |
| 引脚 39 | PTB8 — GPIO multiplexed pin |
| 引脚 40 | PTB9 — GPIO multiplexed pin |
| 引脚 41 | PTB10 — GPIO multiplexed pin |
| 引脚 42 | PTB11 — GPIO multiplexed pin |
| 引脚 43 | PTB16 — GPIO / UART multiplexed pin |
| 引脚 44 | PTB17 — GPIO / UART multiplexed pin |
| 引脚 45 | PTB18 — GPIO multiplexed pin |
| 引脚 46 | PTB19 — GPIO multiplexed pin |
| 引脚 47 | PTA0 — GPIO / SWD / JTAG multiplexed pin |
| 引脚 48 | PTA1 — GPIO / SWD / JTAG multiplexed pin |
| 引脚 49 | PTA2 — GPIO / SWD / JTAG multiplexed pin |
| 引脚 50 | PTA3 — GPIO / SWD / JTAG multiplexed pin |
| 引脚 51 | PTA4 — GPIO / JTAG multiplexed pin |
| 引脚 52 | PTA5 — GPIO / JTAG multiplexed pin |
| 引脚 53 | VDDA — Analog power supply |
| 引脚 54 | VSSA — Analog ground |
| 引脚 55 | PTA6 — GPIO multiplexed pin |
| 引脚 56 | PTA7 — GPIO multiplexed pin |
| 引脚 57 | PTA8 — GPIO multiplexed pin |
| 引脚 58 | PTA9 — GPIO multiplexed pin |
| 引脚 59 | PTA10 — GPIO multiplexed pin |
| 引脚 60 | PTA11 — GPIO multiplexed pin |
| 引脚 61 | PTA12 — GPIO multiplexed pin |
| 引脚 62 | PTA13 — GPIO multiplexed pin |
| 引脚 63 | USB_DP — USB D+ data line |
| 引脚 64 | USB_DM — USB D- data line |
| 引脚 65 | VOUT33 — USB 3.3 V regulator output |
| 引脚 66 | VREGIN — USB regulator input |
| 引脚 67 | PTA16 — GPIO multiplexed pin |
| 引脚 68 | PTA17 — GPIO multiplexed pin |
| 引脚 69 | VBAT — Battery backup supply for RTC |
| 引脚 70 | PTA18 — GPIO / clock multiplexed pin |
| 引脚 71 | PTA19 — GPIO / clock multiplexed pin |
| 引脚 72 | PTC16 — GPIO multiplexed pin |
| 引脚 73 | PTC17 — GPIO multiplexed pin |
| 引脚 74 | PTD0 — GPIO multiplexed pin |
| 引脚 75 | PTD1 — GPIO multiplexed pin |
| 引脚 76 | PTD2 — GPIO multiplexed pin |
| 引脚 77 | PTD3 — GPIO multiplexed pin |
| 引脚 78 | PTD4 — GPIO multiplexed pin |
| 引脚 79 | PTD5 — GPIO multiplexed pin |
| 引脚 80 | PTD6 — GPIO multiplexed pin |
典型应用
MK21DN512AVLK5 适用于 6 应用s: Industrial Automation with USB Connectivity, Secure Access Control and Payment Terminals, Automotive Body and Telematics Subsystems, Medical and Portable Instrumentation, USB Field-Updatable Embedded Devices, Audio and Signal Processing Peripherals.
Industrial Automation with USB Connectivity
The MK21DN512AVLK5 fits industrial automation nodes that need deterministic 32-bit control plus USB service connectivity. Its 50 MHz Cortex-M4 core with DSP/MAC instructions handles motor control loops and protocol processing, while CAN, UART, SPI, and I2C peripherals cover PLC backplane and sensor bus duties. In a typical design, the MCU sits between field I/O and a USB maintenance port, using the 512 KB flash for a large firmware image plus an OTA update loader, and the full-speed USB controller for configuration tools. The trade-off versus a separate USB bridge chip is board space and BOM savings, at the cost of dedicating MCU headroom to USB interrupt servicing.
推荐
Secure Access Control and Payment Terminals
The hardware encryption and anti-tamper (DryIce) features of the MK21DN512AVLK5 make it a strong fit for secure building-access readers and payment terminal controllers. Tamper-detection circuitry monitors the die for physical attack, a differentiator versus generic Cortex-M4 MCUs such as the STM32F407, which rely on external secure elements. The 512 KB flash accommodates cryptographic key stores and secure bootloaders, and the 64 KB SRAM buffers transaction sessions. The MCU runs the user interface, reads credentials via SPI/I2C, and reports over USB. Designers should pair it with a dedicated secure element for the highest assurance levels, using the anti-tamper MCU as the first line of defense rather than the sole security boundary.
推荐
Automotive Body and Telematics Subsystems
Arrow's product data marks the MK21DN512AVLK5 as automotive AEC-Q100 qualified, supporting -40C to +105C operation, which positions it for telematics control units, body-control modules, and infotainment peripheral nodes. The CAN peripheral integrates directly with vehicle buses, the 50 MHz Cortex-M4 core manages gateway filtering and diagnostics, and full-speed USB supports module flashing and diagnostics during production and service. The 12x12 mm 80-LQFP keeps board area compact in space-constrained modules. Designers must implement proper load-dump protection on supplies and follow AEC-Q100 PCB assembly rules; the MCU itself handles the qualified silicon side of the requirement.
推荐
Medical and Portable Instrumentation
Battery-powered medical monitors and portable diagnostic instruments benefit from the MK21DN512AVLK5's combination of the 16-bit ADC, 12-bit DAC, low-power modes, and USB device port for data upload to clinical workstations. The 50 MHz Cortex-M4 performs digital filtering and FFT analysis of biosignals in firmware, while the 512 KB flash stores calibration tables, patient-configuration data, and logged measurement results. USB OTG allows direct connection to hosts without a protocol converter. Power-conscious design should exploit the MCU's low-power stop modes between 50 MHz active bursts, since the analog front-end typically dominates the power budget; the MCU contribution remains modest relative to the sensing circuitry.
推荐
USB Field-Updatable Embedded Devices
Products requiring firmware field updates over USB - such as test instruments, dongles, and accessories - are a natural application for the MK21DN512AVLK5. The integrated full-speed USB 2.0 device/OTG controller enumerates directly to a PC host, and the 512 KB flash allows a resident bootloader plus a dual-bank application image, enabling safe A/B firmware switching with rollback. At 50 MHz the Cortex-M4 sustains full-speed USB throughput while running the application concurrently thanks to the crossbar bus architecture. This removes the need for a dedicated USB bootloader chip or external serial NOR flash, reducing BOM count and board area in cost-sensitive designs.
推荐
Audio and Signal Processing Peripherals
The Cortex-M4 DSP instructions and single-cycle MAC in the MK21DN512AVLK5 enable real-time audio filtering, AGC, and simple effects processing for USB audio accessories and industrial sound-processing modules. I2S-capable serial peripherals (via the flexible SPI/port multiplexing per the K21 datasheet) connect to audio codecs, while the full-speed USB controller implements a USB Audio Class device endpoint. The 64 KB SRAM constrains buffer depth for high channel counts, so applications beyond a stereo 48 kHz pipeline should use a dedicated DSP or audio MCU; within that envelope, the 512 KB flash holds the USB stack, DSP coefficient tables, and application logic comfortably.
推荐
推荐产品汇总
工程参考数据： MK21DN512AVLK5 ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | MK21DN512VLK5 | MK21DX256AVLK5 | MK20DX256VLK10 | MK11DN512AVLK5 |
|---|---|---|---|---|---|
| Package | 80-LQFP (12x12 mm) | 80-LQFP (12x12 mm) - same | 80-LQFP (12x12 mm) - same | 80-LQFP (12x12 mm) - same | 80-LQFP (12x12 mm) - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Core / Frequency | Cortex-M4, 50 MHz | Cortex-M4, 50 MHz | Cortex-M4, 50 MHz | Cortex-M4, 100 MHz core option (VLK10) | Cortex-M4, 50 MHz |
| Flash | 512 KB | 512 KB | 256 KB | 256 KB | 512 KB |
| SRAM | 64 KB | 64 KB | 64 KB | 64 KB | 64 KB |
| USB | Full-Speed USB 2.0 device/OTG | Full-Speed USB device/OTG | Full-Speed USB device/OTG | Full-Speed USB device | No USB |
| Anti-Tamper Security | Yes (DryIce, hardware encryption) | Yes (DryIce) | Yes (DryIce) | No | Yes (DryIce) |
关键差异点
- Integrated anti-tamper (DryIce) hardware （对比 MK20DX256VLK10)
- Full USB connectivity with 512 KB flash （对比 MK11DN512AVLK5)
- Double the flash of the value-tier sibling （对比 MK21DX256AVLK5)
设计说明
Decouple each VDD pin with a 100 nF ceramic capacitor placed within 2 mm of the pin, plus one 4.7 uF bulk capacitor near the MCU. Keep the VDDA/VSSA analog supply on a separate filtered feed (ferrite bead plus 1 uF) because the ADC reference quality directly sets measurement accuracy. VREFH/VREFL should be routed as a quiet analog pair away from USB and switching signals. The USB D+/D- pair must be routed as a 90-ohm differential pair with length matching within 1 mm.
The part operates at 1.8 V, 2.5 V, or 3.3 V rails. If powering from USB VBUS (5 V), feed the on-chip regulator through VREGIN and use VOUT33 (3.3 V) to supply the chip, adding a 4.7 uF capacitor on VOUT33 and 1 uF on VREGIN per the K21 datasheet typical application. Do not load VOUT33 with external circuitry beyond the specified current, as the internal regulator is sized for the MCU only.
Budget the 64 KB SRAM carefully: a USB device stack (CDC or MSC class) with double buffering plus an RTOS can consume 15-25 KB before application variables. The 512 KB flash erase granularity means large parameter tables cause erase-latency stalls - wear-level small writes or buffer them in SRAM. Configure SWD/JTAG pins (PTA0-PTA5) correctly before remapping them as GPIO, or you can lock yourself out of debug access on assembled boards.
Estimated: at 50 MHz with all peripherals active, typical core current is on the order of 20-30 mA at 3.3 V (verify against the datasheet power tables for your exact configuration), giving roughly 66-99 mW dissipation. The 80-LQFP theta_JA of approximately 50-60 C/W (estimate - confirm datasheet value) yields a junction rise of only a few degrees Celsius above ambient, so no heatsinking is required for this MCU in normal operation.
合规信息
AEC-Q100 qualification stated in Arrow product listing ('Automotive AEC-Q100'). RoHS/REACH/lead-free status not stated in provided data - verify on the NXP product page under Environmental Quality.