NXP Semiconductors MK51DX128CLH7

Overview

MK51DX128CLH7 from NXP Semiconductors (formerly Freescale) is a Kinetis K51-series ARM Cortex-M4 microcontroller with DSP extension, 128 KB flash, 64 LQFP-10×10 mm package, operating at up to 72 MHz, supporting USB On-The-Go, dual 16-bit SAR ADCs with PGA, and real-time clock - deployed in industrial HMI, portable medical sensors, and low-power metering systems.

For engineers reviewing the MK51DX128CLH7 datasheet, MK51DX128CLH7 pinout, MK51DX128CLH7 application, or MK51DX128CLH7 equivalent, key selection considerations include its -40°C to +85°C temperature grade, 1.71–3.6 V supply range, integrated LCD controller (36×8 or 40×4), TSI touch interface, and hardware CRC module for firmware integrity verification.

Technical Context

The MK51DX128CLH7 implements a 32-bit ARM Cortex-M4 core with DSP instructions and no FPU, paired with a multi-purpose clock generator supporting 3–32 MHz crystal and 32 kHz RTC oscillator inputs. Its memory subsystem includes 128 KB on-chip flash with FlexMemory capability and 16 KB SRAM.

Peripherals are managed via a 16-channel DMA controller with 63 request sources, enabling concurrent operation of USB OTG, three UARTs, two I²C modules, SPI, I²S, and eight-channel PWM timer - all coordinated under multiple low-power modes including VLLS1–VLLS3 and VLPR with sub-μA stop-mode current.

Key Specifications

Pinout & Package

Package: 64-pin LQFP (10 mm × 10 mm, LH suffix), 0.5 mm pitch, exposed thermal pad. RoHS-compliant, moisture sensitivity level 3.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microcontroller applications.

Compared with KL27Z128VLH7 and MKE15Z128VLH7, the MK51DX128CLH7 uniquely delivers USB On-The-Go plus integrated LCD and TSI - making it the only option among the three for portable HMI devices requiring both local display and host-mode USB configuration.

Availability

MK51DX128CLH7 is available at Aetrix Electronics and suitable for industrial HMI, portable medical sensors, and smart energy metering requiring stable component supply, long-lifecycle support, and verified qualification across temperature and voltage extremes.

Supply support for MK51DX128CLH7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications, with roots in Freescale's Kinetis MCU portfolio.

The MK51DX128CLH7 belongs to the Kinetis K51 family - designed specifically for cost-optimized, low-power human-machine interface and sensor-processing applications requiring integrated analog peripherals, USB flexibility, and robust industrial qualification.

FAQ

What is the maximum operating frequency of the MK51DX128CLH7?

The MK51DX128CLH7 operates at a maximum system and core clock frequency of 72 MHz. This is achieved using the internal MCG clock generator in FEE mode with an external 3–32 MHz crystal. The 72 MHz rating applies across the full -40°C to +85°C ambient temperature range and 1.71–3.6 V supply voltage, as specified in the K51 Sub-Family Data Sheet Rev. 3.

Does the MK51DX128CLH7 support USB host functionality?

Yes, the MK51DX128CLH7 integrates a full-/low-speed USB On-The-Go (OTG) controller with an on-chip transceiver, enabling both host and device roles without external PHY components. The MK51DX128CLH7 supports USB CDC, HID, and MSC class drivers, and its OTG capability is validated per USB 2.0 specification in the official K51P64M72SF1 datasheet.

What analog peripherals are integrated into the MK51DX128CLH7?

The MK51DX128CLH7 integrates two independent 16-bit SAR ADCs, each with a programmable gain amplifier (PGA) up to ×64; a 12-bit DAC; two operational amplifiers; one transimpedance amplifier; three analog comparators (each with a 6-bit DAC and programmable reference); and a precision voltage reference. All are documented in Section 6.6 of the K51 Sub-Family Data Sheet.

What low-power modes does the MK51DX128CLH7 support, and what is its lowest current draw?

The MK51DX128CLH7 supports seven low-power modes, including VLLS1–VLLS3. Its lowest active-retention current is 1.47 μA in VLLS1 mode at 3.0 V and -40°C to +25°C ambient, with RTC and selected wakeup sources enabled. This value is measured and guaranteed per Table 6 in the K51P64M72SF1 datasheet Rev. 3.

Is the MK51DX128CLH7 pin-compatible with other Kinetis K51 variants?

No, the MK51DX128CLH7 is not universally pin-compatible across all K51 variants. Pin compatibility depends on identical package type (LH = 64-LQFP) and matching peripheral enablement in the silicon mask. For example, MK51DN128CLH7 (no FlexMemory) shares the same pinout, but MK51DX256CLH7 (256 KB flash) may differ in reset or debug pin behavior. Always verify against the specific variant's pin assignment table in the K51P64M72SF1 document.