NXP Semiconductors MKW41Z256VHT4

Overview

MKW41Z256VHT4 from NXP Semiconductors is a Bluetooth Low Energy v4.2 and IEEE 802.15.4–compliant System-on-Chip (SoC) integrating an ARM Cortex-M0+ core running at up to 48 MHz, 256 KB flash, 64 KB SRAM, and a multi-standard 2.4 GHz transceiver with -95 dBm BLE sensitivity and programmable output power from -30 dBm to +3.5 dBm. It targets ultra-low-power wireless sensor nodes in medical wearables and smart home edge devices.

For engineers reviewing the MKW41Z256VHT4 datasheet, MKW41Z256VHT4 pinout, MKW41Z256VHT4 application, or MKW41Z256VHT4 equivalent, key selection criteria include its dual-protocol radio support, VLLS0 mode current of 182 nA, integrated DC-DC buck/boost converter, on-chip balun, and hardware AES-128 acceleration for secure over-the-air updates.

Technical Context

The MKW41Z256VHT4 implements a tightly coupled radio-MCU architecture where BLE Link Layer and IEEE 802.15.4 packet processing are accelerated in dedicated hardware engines-enabling concurrent dual-PAN operation and up to two simultaneous BLE connections without host CPU intervention. Its RF section uses a single-ended bidirectional port with integrated balun and supports 26/32 MHz crystal references depending on active protocol mode.

Power management integrates a configurable DC-DC converter supporting Buck (2.1–4.2 V), Boost (0.9–1.795 V), and Bypass modes, enabling direct operation from coin-cell or alkaline batteries. The SoC delivers 6.8 mA typical Rx current and 6.1 mA Tx current at 0 dBm while maintaining full peripheral functionality across nine low-power modes including VLLS0.

Key Specifications

Pinout & Package

Package: 48-pin Laminate QFN, 7 mm × 7 mm × 0.98 mm, 0.5 mm pitch. RoHS-compliant, moisture sensitivity level 3.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multi-protocol wireless SoC applications.

Compared with MKW41Z256VHT4, MKW41Z512VHT4 offers double flash/SRAM for complex mesh deployments, while MKW31Z256VHT4 reduces BOM cost and certification scope by omitting 802.15.4 hardware - all three share identical power architecture, debug interface, and low-power modes.

Availability

MKW41Z256VHT4 is available at Aetrix Electronics and suitable for medical wearables, smart home sensors, industrial remote controls, and asset tracking tags requiring stable component supply across long-lifecycle embedded programs.

Supply support for MKW41Z256VHT4 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 specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with headquarters in Eindhoven, Netherlands.

The MKW41Z series belongs to NXP's Kinetis Wireless portfolio, designed specifically for ultra-low-power, multi-protocol wireless edge nodes requiring certified BLE, IEEE 802.15.4, and proprietary FSK operation in compact, battery-constrained form factors.

FAQ

What radio standards does the MKW41Z256VHT4 support?

The MKW41Z256VHT4 supports Bluetooth Low Energy v4.2 (GFSK), IEEE Std. 802.15.4–2011 (O-QPSK), and generic FSK modulation at 250/500/1000 kbps. All three protocols operate on the same 2.4 GHz transceiver with hardware-accelerated link layers - no software-only emulation. MKW41Z256VHT4 achieves -95 dBm sensitivity in BLE mode and -100 dBm in 802.15.4 mode, with programmable transmit power from -30 dBm to +3.5 dBm.

Does the MKW41Z256VHT4 require external RF components?

No, the MKW41Z256VHT4 integrates an on-chip balun and uses a single-ended bidirectional RF port, eliminating the need for external baluns or differential matching networks. Only a simple pi-network (typically two capacitors and one inductor) is required between the RF_IN/OUT pin and antenna for impedance matching. This reduces BOM count, PCB area, and RF calibration effort - critical for high-volume, space-constrained designs like wearables.

What is the lowest power consumption mode of the MKW41Z256VHT4?

The MKW41Z256VHT4 achieves 182 nA in Very-Low-Leakage Stop (VLLS0) mode with RTC and wake-on-RF enabled - verified per datasheet Rev. 4, Section 6.2.1. In this mode, the ARM Cortex-M0+ core, flash, and most peripherals are powered down, but the 32.768 kHz oscillator remains active to maintain precise timing for BLE advertising intervals and periodic wake-ups. MKW41Z256VHT4 retains RAM contents and supports fast wake-up (<10 µs) from GPIO or RF events.

How much memory does the MKW41Z256VHT4 provide for application code?

The MKW41Z256VHT4 includes 256 KB of on-chip flash memory and 64 KB of SRAM. Flash is organized in two 128 KB blocks, enabling background programming (execute-from-one-block-while-programming-the-other). SRAM is fully accessible to both CPU and DMA. This memory configuration supports full NXP-provided BLE and Thread protocol stacks alongside customer application logic - verified in NXP's KW41Z SDK v2.2.1 reference builds targeting MKW41Z256VHT4.

Is the MKW41Z256VHT4 pin-compatible with other KW41Z variants?

Yes, MKW41Z256VHT4 is pin-compatible with MKW41Z512VHT4 and MKW31Z256VHT4 in the 48-pin Laminate QFN package (7 × 7 mm). All share identical pin assignments for power, ground, debug, crystal, RF, and peripheral I/O. Differences are limited to internal memory size and enabled radio protocols - meaning hardware design reuse is possible across these variants, simplifying platform development and inventory management for MKW41Z256VHT4-based products.