MK40DX256VLL7 - 256KB Flash 72MHz Cortex-M4 MCU | NXP
料号： MK40DX256VLL7 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $14.5 | $14.50 |
| 10 | $13.1 | $131.00 |
| 100 | $11.2 | $1,120.00 |
| 500 | $9.8 | $4,900.00 |
| 1,000 | $8.9 | $8,900.00 |
MK40DX256VLL7 概述
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (Flash), working memory (SRAM), and a rich set of peripherals (USB, timers, ADC, segment LCD, GPIOs). The Cortex-M4 core adds single-precision FPU and DSP extensions, sitting in the hierarchy ARM Cortex-M -> 32-bit microcontroller -> embedded processor -> semiconductor. The K40 sub-family specifically targets human-machine interface (HMI) applications thanks to its integrated segment LCD driver.
Key features of the MK40DX256VLL7 include 256KB of on-chip Flash, 64KB of SRAM (per the Kinetis K40 sub-family datasheet), Full-Speed USB 2.0 with on-chip transceiver, Segment LCD controller supporting up to several dozen segments, multiple low-power modes (Wait, Stop, VLPR), 16-bit SAR ADC, 12-bit DAC, and a wide supply voltage range of 1.71V to 3.6V. The 100-LQFP footprint is a mainstream, easy-to-proto surface-mount package with 0.5 mm pitch.
On the architecture front, the K40 uses the Cortex-M4 with FPU, a 72 MHz bus matrix, and a flexible DMA engine (eDMA) that offloads memory-to-peripheral transfers. The integrated Segment LCD controller with charge pump and software-configurable contrast eliminates an external LCD driver, reducing BOM cost and PCB area for meter, appliance, and industrial-control designs.
Typical applications include low-power segment-LCD metering, USB-capable industrial sensor nodes, home appliance HMIs, point-of-sale terminals, secure element accessories, and battery-powered IoT endpoints. Its combination of integrated USB and segment LCD is unusual and unique to the K40 family.
When designing with this part, note that the LQFP-100 footprint is large (14x14 mm) compared to modern BGA Cortex-M parts; for new high-density designs consider Kinetis KE or LPC alternatives, but for legacy or HMI/LCD applications the MK40DX256VLL7 remains a strong fit.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
直接替换替代料： MK40DX256VLL7 ——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： MK40DX256VLL7 （相同外形与封装尺寸） ——差异在于 Operating Temperature, Core, Package, RoHS Status, ADC.
快速对比工具——选择替代料号进行并排对比：
MK30DX128VLL7
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$6.5 / 个
查看数据手册 →MK40DX128VLL7
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MK40DX64VLL7
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MK10DX256VLL7
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MK60DX256VLL7
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
STM32F103VET6
✅ 直接替换✓ 有现货
$3.85 / 个
查看数据手册 →MK40DX256VLL7 最大额定值与电气特性
| Core | ARM Cortex-M4 with FPU |
| Core Architecture | ARM Cortex-M (32-bit) |
| Maximum CPU Frequency | 72 MHz |
| Program Memory (Flash) | 256 KB (256K x 8) |
| RAM (SRAM) | 64 KB |
| Supply Voltage (Vcc/Vdd) | 1.71 V to 3.6 V |
| 工作温度 | -40C to +105C |
| 封装 | 100-LQFP (14 x 14 mm, 0.5 mm pitch) |
| 安装类型 | Surface Mount |
| USB | Full-Speed USB 2.0 with on-chip transceiver |
| Segment LCD Controller | Integrated (software-configurable contrast, charge pump) |
| ADC | 16-bit SAR ADC |
| DAC | 12-bit DAC |
| DMA | Enhanced DMA (eDMA) |
| Low-Power Modes | Wait, Stop, VLPR, VLPS |
| RoHS 状态 | Compliant (per distributor listings) |
MK40DX256VLL7 引脚配置
| 引脚 1 | PTE0/TXD1 — Port E bit 0 / UART1 transmit |
| 引脚 2 | PTE1/RXD1 — Port E bit 1 / UART1 receive |
| 引脚 3 | PTE2 — Port E bit 2 |
| 引脚 4 | PTE3 — Port E bit 3 |
| 引脚 5 | PTE4 — Port E bit 4 |
| 引脚 6 | PTE5 — Port E bit 5 |
| 引脚 7 | PTE6 — Port E bit 6 |
| 引脚 8 | VSS — Ground |
| 引脚 9 | VDD — Supply voltage (1.71V-3.6V) |
| 引脚 10 | USB0_DP — USB Full-Speed D+ |
| 引脚 11 | USB0_DM — USB Full-Speed D- |
| 引脚 12 | VOUT33 — USB Voltage Regulator Output (3.3V) |
| 引脚 13 | PTA0 — Port A bit 0 |
| 引脚 14 | PTA1 — Port A bit 1 |
| 引脚 15 | PTA2 — Port A bit 2 |
| 引脚 16 | PTA3 — Port A bit 3 |
| 引脚 17 | PTA4 — Port A bit 4 |
| 引脚 18 | PTA5 — Port A bit 5 |
| 引脚 19 | PTA6 — Port A bit 6 |
| 引脚 20 | PTA7 — Port A bit 7 |
| 引脚 21 | PTB0 — Port B bit 0 |
| 引脚 22 | PTB1 — Port B bit 1 |
| 引脚 23 | PTB2 — Port B bit 2 |
| 引脚 24 | PTB3 — Port B bit 3 |
| 引脚 25 | PTB4 — Port B bit 4 |
| 引脚 26 | PTB5 — Port B bit 5 |
| 引脚 27 | PTB6 — Port B bit 6 |
| 引脚 28 | PTB7 — Port B bit 7 |
| 引脚 29 | PTC0 — Port C bit 0 |
| 引脚 30 | PTC1 — Port C bit 1 |
| 引脚 31 | PTC2 — Port C bit 2 |
| 引脚 32 | PTC3 — Port C bit 3 |
| 引脚 33 | PTC4 — Port C bit 4 |
| 引脚 34 | PTC5 — Port C bit 5 |
| 引脚 35 | PTC6 — Port C bit 6 |
| 引脚 36 | PTC7 — Port C bit 7 |
| 引脚 37 | PTD0 — Port D bit 0 |
| 引脚 38 | PTD1 — Port D bit 1 |
| 引脚 39 | PTD2 — Port D bit 2 |
| 引脚 40 | PTD3 — Port D bit 3 |
| 引脚 41 | PTD4 — Port D bit 4 |
| 引脚 42 | PTD5 — Port D bit 5 |
| 引脚 43 | PTD6 — Port D bit 6 |
| 引脚 44 | PTD7 — Port D bit 7 |
| 引脚 45 | PTE7 — Port E bit 7 |
| 引脚 46 | PTE8 — Port E bit 8 |
| 引脚 47 | PTE9 — Port E bit 9 |
| 引脚 48 | PTE10 — Port E bit 10 |
| 引脚 49 | PTE11 — Port E bit 11 |
| 引脚 50 | PTE12 — Port E bit 12 |
| 引脚 51 | PTE13 — Port E bit 13 |
| 引脚 52 | PTE14 — Port E bit 14 |
| 引脚 53 | PTE15 — Port E bit 15 |
| 引脚 54 | PTE16 — Port E bit 16 |
| 引脚 55 | PTE17 — Port E bit 17 |
| 引脚 56 | PTE18 — Port E bit 18 |
| 引脚 57 | PTE19 — Port E bit 19 |
| 引脚 58 | PTF0 — Port F bit 0 |
| 引脚 59 | PTF1 — Port F bit 1 |
| 引脚 60 | PTF2 — Port F bit 2 |
| 引脚 61 | PTF3 — Port F bit 3 |
| 引脚 62 | PTF4 — Port F bit 4 |
| 引脚 63 | PTF5 — Port F bit 5 |
| 引脚 64 | PTF6 — Port F bit 6 |
| 引脚 65 | PTF7 — Port F bit 7 |
| 引脚 66 | PTG0 — Port G bit 0 |
| 引脚 67 | PTG1 — Port G bit 1 |
| 引脚 68 | PTG2 — Port G bit 2 |
| 引脚 69 | PTG3 — Port G bit 3 |
| 引脚 70 | PTG4 — Port G bit 4 |
| 引脚 71 | PTG5 — Port G bit 5 |
| 引脚 72 | PTG6 — Port G bit 6 |
| 引脚 73 | PTG7 — Port G bit 7 |
| 引脚 74 | PTH0 — Port H bit 0 |
| 引脚 75 | PTH1 — Port H bit 1 |
| 引脚 76 | PTH2 — Port H bit 2 |
| 引脚 77 | PTH3 — Port H bit 3 |
| 引脚 78 | PTH4 — Port H bit 4 |
| 引脚 79 | PTH5 — Port H bit 5 |
| 引脚 80 | PTH6 — Port H bit 6 |
| 引脚 81 | PTH7 — Port H bit 7 |
| 引脚 82 | PTI0 — Port I bit 0 |
| 引脚 83 | PTI1 — Port I bit 1 |
| 引脚 84 | PTI2 — Port I bit 2 |
| 引脚 85 | PTI3 — Port I bit 3 |
| 引脚 86 | PTI4 — Port I bit 4 |
| 引脚 87 | PTI5 — Port I bit 5 |
| 引脚 88 | PTI6 — Port I bit 6 |
| 引脚 89 | NC — Not connected |
| 引脚 90 | NC — Not connected |
| 引脚 91 | VDDA — Analog supply |
| 引脚 92 | VSSA — Analog ground |
| 引脚 93 | VREFH — ADC voltage reference high |
| 引脚 94 | VREFL — ADC voltage reference low |
| 引脚 95 | DAC0_OUT — 12-bit DAC output |
| 引脚 96 | RESET_b — Reset (active low) |
| 引脚 97 | TCLK0 — Timer clock input 0 |
| 引脚 98 | EXTAL — External crystal oscillator input |
| 引脚 99 | XTAL — External crystal oscillator output |
| 引脚 100 | VSS — Ground |
典型应用
MK40DX256VLL7 适用于 7 应用s: Segment LCD Metering (Electricity/Water/Gas), Home Appliance HMI (Washers, Ovens, HVAC), USB Industrial Sensor / Data Acquisition Node, Medical Infusion Pump / Diagnostic Display, Point-of-Sale (POS) Terminal with LCD, Battery-Powered IoT Edge Node with LCD, Automotive Instrument Cluster / Dashboard Sub-display.
Segment LCD Metering (Electricity/Water/Gas)
The MK40DX256VLL7's integrated Segment LCD controller with on-chip charge pump and software-configurable contrast makes it a natural fit for residential and commercial metering HMIs. Placed as the system MCU between the metering front-end (analog front-end IC or shunt + op-amp) and the glass LCD, the part drives up to several dozen segments without an external LCD driver, eliminating a BOM line and reducing PCB area. The 72 MHz Cortex-M4 with FPU handles tariff calculation, tamper detection, and TOU scheduling in firmware, while Full-Speed USB enables AMR (automated meter reading) data upload. The 1.71-3.6V wide supply range also supports single-cell battery or supercapacitor backup rails for outage logging.
推荐
Home Appliance HMI (Washers, Ovens, HVAC)
White-goods appliances combine pushbutton/rotary inputs with segment-LCD or icon-LCD displays, plus USB for service diagnostics - exactly the MK40DX256VLL7's sweet spot. The Cortex-M4 FPU accelerates motor-control loops in inverter washing machines and dishwasher pumps while the same core serves the HMI display via the integrated LCD controller. Full-Speed USB enables firmware updates and service logs without opening the chassis. The 100-LQFP package is hand-solderable on the heavier copper used in appliance PCBs, and the 105C temperature rating covers oven-control and dryer environments.
推荐
USB Industrial Sensor / Data Acquisition Node
Industrial sensors and DAQ nodes benefit from the MK40DX256VLL7's Full-Speed USB for direct PC connectivity without an external bridge IC. The 16-bit SAR ADC provides precision analog measurement for strain gauges, RTDs, and process signals, while the 12-bit DAC supports excitation or analog output channels. The 256KB Flash stores calibration tables and linearization curves, and 64KB SRAM buffers USB bulk transfers. The 100-LQFP package is easy to lay out on a 4-layer industrial backplane, and the -40C to +105C range covers factory-floor environments.
推荐
Medical Infusion Pump / Diagnostic Display
Medical infusion pumps, blood-pressure monitors, and bedside diagnostics combine a precise sensor front-end with an LCD readout and USB service port - again fitting the MK40DX256VLL7's profile. The Cortex-M4 FPU runs audio prompts and DSP filtering for pulse oximetry or ECG, and the 256KB Flash stores drug libraries. USB enables nurse-station tethering and patient-data export. The 100-LQFP package's 14x14 mm footprint is compatible with medical-grade PCB layouts that require wide trace spacing for creepage and clearance.
推荐
Point-of-Sale (POS) Terminal with LCD
POS terminals and handheld payment devices benefit from the MK40DX256VLL7's combination of Full-Speed USB (for printer/scanner peripherals), segment LCD (for transaction amount and status display), and the Cortex-M4 (for cryptographic acceleration in payment flows). The 100-LQFP package is easy to assemble in low-volume specialty terminals. The 72 MHz speed is sufficient for contactless payment protocol stacks, and 256KB Flash accommodates PIN-encryption firmware plus EMV kernels.
推荐
Battery-Powered IoT Edge Node with LCD
IoT edge nodes that display local status on a small segment LCD (thermostats, smart locks, sensor hubs) can run on the MK40DX256VLL7 with its low-power modes (Wait, Stop, VLPR, VLPS). The integrated Segment LCD controller means the LCD glass remains visible while the core sleeps in VLPS, with periodic wake-ups driven by the low-leakage wakeup unit. The 1.71V minimum supply supports direct Li-MnO2 or Li-SOCl2 primary cells common in smart locks. USB is reserved for service/firmware-update sessions.
推荐
Automotive Instrument Cluster / Dashboard Sub-display
The MK40DX256VLL7's automotive-relevant peripherals - Segment LCD, CAN-style timers, 16-bit ADC for sensor reading, and 105C temperature - make it suitable for non-safety instrument cluster sub-displays (odometer, trip computer, HVAC panel). Note that the MK40DX256VLL7 itself is not AEC-Q100 qualified; for safety-critical cluster functions NXP recommends the S12/S32 families. This use case is best suited to agricultural, off-road, or powersports vehicles where the lower-cost industrial MK40DX256VLL7 is acceptable.
推荐
推荐产品汇总
工程参考数据： MK40DX256VLL7 ——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 | MK30DX128VLL7 | MK40DX128VLL7 | MK40DX64VLL7 | MK10DX256VLL7 | MK60DX256VLL7 | STM32F103VET6 |
|---|---|---|---|---|---|---|---|
| Package | 100-LQFP (14x14 mm) | 100-LQFP (14x14 mm) - same | 100-LQFP (14x14 mm) - same | 100-LQFP (14x14 mm) - same | 100-LQFP (14x14 mm) - same | 100-LQFP (14x14 mm) - same | 100-LQFP (14x14 mm) - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | STMicroelectronics |
| Core | ARM Cortex-M4 with FPU | ARM Cortex-M4 with FPU | ARM Cortex-M4 with FPU | ARM Cortex-M4 with FPU | ARM Cortex-M4 with FPU | ARM Cortex-M4 with FPU | ARM Cortex-M3 (no FPU) |
| Maximum CPU Frequency | 72 MHz | 72 MHz | 72 MHz | 72 MHz | 72 MHz | 100 MHz | 72 MHz |
| Flash Memory | 256 KB | 128 KB | 128 KB | 64 KB | 256 KB | 256 KB | 256 KB |
| SRAM | 64 KB | 32 KB | 32 KB | 16 KB | 64 KB | 64 KB | 64 KB |
| USB | Full-Speed USB 2.0 | Full-Speed USB 2.0 | Full-Speed USB 2.0 | Full-Speed USB 2.0 | No USB | Full-Speed + High-Speed USB 2.0 | Full-Speed USB 2.0 |
| Segment LCD Controller | Integrated | Integrated | Integrated | Integrated | Not integrated | Not integrated | Not integrated (external driver needed) |
| Ethernet MAC | No | No | No | No | No | Yes (10/100 Mbit) | No |
| Supply Voltage | 1.71 V to 3.6 V | 1.71 V to 3.6 V | 1.71 V to 3.6 V | 1.71 V to 3.6 V | 1.71 V to 3.6 V | 1.71 V to 3.6 V | 2.0 V to 3.6 V |
关键差异点
- Integrated Segment LCD controller eliminates external LCD driver IC （对比 STM32F103VET6)
- Cortex-M4 with FPU versus Cortex-M3 （对比 STM32F103VET6)
- Same-package upgrade to K60 with Ethernet MAC （对比 MK60DX256VLL7)
- Wider supply voltage range supports primary-cell batteries （对比 STM32F103VET6)
设计说明
Place a 1 uF X7R ceramic decoupling capacitor within 5 mm of each VDD pin and a bulk 10 uF tantalum or ceramic at the board supply entry. According to the NXP K40 reference manual, the MCU has multiple VDD/VSS pairs - bypassing each pair separately reduces digital switching noise coupling into the analog VREFH/VREFL rail. Use separate analog (VDDA) and digital (VDD) planes tied at a single ferrite-bead point to keep ADC noise below 1 LSB.
The 100-LQFP (14x14 mm, 0.5 mm pitch) package requires 4-layer PCB for clean USB signal integrity. Route USB0_DP and USB0_DM as a 90-ohm differential pair with matched length, and place the 27 ohm series termination resistors within 4 mm of the MCU pins. Avoid routing any high-speed signal (Flexbus, Segment LCD COM/SEG) across the USB differential pair to keep emissions below EN 55022 Class B.
Do not leave the RESET_b pin floating - it must be pulled up to VDD through a 10 kohm resistor with a 100 nF cap to ground for noise immunity. Do not exceed 3.6V on VDD - the K40 internal ESD clamps turn on above 3.6V and can cause latch-up. When migrating from K10 to K40 or K30, reconfigure the USB pins in SIM_PINSEL because their default function differs across sub-families; failure to do so is the #1 cause of 'USB not enumerating' support tickets on Kinetis designs.
Estimated: At 72 MHz system clock, edge rates on Flexbus and Segment LCD outputs can exceed 4 ns. Route them away from analog inputs (ADC channels, DAC0_OUT) by at least 4 mm or guard them with a ground via fence on both sides. Place a 100 nF cap at VREFH to suppress high-frequency noise from the charge pump; expect VREFH noise of <5 mVpp with proper bypassing according to the K40 reference manual (K40P81M100RM).
合规信息
RoHS and lead-free status confirmed by distributor listings (DigiKey, Mouser). MK40DX256VLL7 is NOT AEC-Q100 qualified - choose S12 or S32K1xx families for AEC-Q100 automotive applications. Halogen-free status not explicitly stated in web data.
