Kinetis® KW41Z-2.4 GHz Dual Mode: Bluetooth® Low Energy and 802.15.4 Wireless Radio Microcontroller (MCU) based on Arm® Cortex®-M0+ Core

Click over video to play

Block Diagram

Kinetis® W Series KW40Z MCUs Block Diagram

Kinetis<sup>&#174;</sup> W Series KW41Z MCUs Block Diagram


Multi-Protocol Radio

  • 2.4 GHz Bluetooth Low Energy version 4.2 Compliant
  • IEEE Std. 802.15.4 Standard Compliant
  • Typical Receiver Sensitivity (Bluetooth Low Energy) = -95 dBm
  • Typical Receiver Sensitivity (802.15.4) = -100 dBm
  • Programmable Transmitter Output Power up to +3.5 dBm

Core and Memories

  • Up to 48 MHz Arm® Cortex®-M0+ core
  • Up to 512 KB Flash memory
  • Up to 128 KB SRAM
  • Excellent coexistence performance
  • Integrated balun to reduce system cost and PCB board area

Low Power Consumption and Operating Voltage Ranges

  • Nine low-power modes to provide power optimization based on application requirements
  • Typical Rx/Tx Current (DC/DC Enabled): 6.5 mA / 8.4 mA
  • Typical Rx/Tx Current (DC/DC Enabled): 6.8/6.1 mA
  • Bypass Voltage: 1.71V to 3.6V
  • DCDC Converter Buck Configuration: 2.1V to 4.2V
  • DCDC Converter Boost Configuration: 0.9V to 1.795V

Analog modules

  • 16-bit Analog-to-Digital Converter (ADC)
  • 12-bit Digital-to-Analog Converter (DAC)
  • 6-bit High Speed Analog Comparator (CMP)


  • AES-128 Accelerator (AESA), True Random Number Generator (TRNG)

Supported Software

  • Bluetooth Low Energy Host Stack and Profiles
  • Generic FSK Link Layer Software
  • Thread
  • Thread + Bluetooth Low Energy Stack
  • Zigbee 3.0
  • Zigbee 3.0 + Bluetooth Low Energy Stack
  • Kinetis® Software Development Kit (SDK)
  • FreeRTOS kernel and a bare-metal non-preemptive task scheduler
  • Support for MCUXpresso and IAR

Comparison Table

Kinetis KW41Z Family Solutions

Part Number Wireless Connectivity Protocol Memory Package Size Hardware Development Tool
MKW41Z512VHT4 Bluetooth Low Energy and IEEE 802.15.4 512 KB Flash,
128 KB RAM
7 mm x 7 mm x 1 mm
48-pin Laminate QFN
MKW41Z256VHT4 256 KB Flash,
MKW41Z512CAT4R 512 KB Flash,
128 KB RAM
3.9 mm x 3.8 mm
75-pin WLCSP
MKW31Z512VHT4 Bluetooth Low Energy 512 KB Flash,
128 KB RAM
7 mm x 7 mm x 1 mm
48-pin Laminate QFN
MKW31Z256VHT4 256 KB Flash,
MKW31Z512CAT4R 512 KB Flash,
128 KB RAM
3.9 mm x 3.8 mm
75-pin WLCSP
MKW21Z512VHT4 IEEE 802.15.4 512 KB Flash,
128 KB RAM
7 mm x 7 mm x 1 mm
48-pin Laminate QFN
MKW21Z256VHT4 256 KB Flash,

MCUXpresso Software and Tools

Protocol Stacks

Connectivity Software

MCUXpresso SDK for KW41Z includes the following components:

  • KW41Z Bluetooth® low energy v4.2 stack, v1.2.8
  • KW41Z Thread® stack v1.2.8
  • KW41Z Zigbee® stack, v6.0.9
  • KW41Z IEEE® 802.15.4-2006/2011 MAC/PHY implementation v5.3.8
  • KW41Z Generic FSK link layer software v1.0.7
  • KW41Z Simple Media Access Controller (SMAC) v3.3.7
  • KW41Z-enabled Connectivity Framework v5.3.8

NXP Designs: Reference Design Library

Technical content and expertise to help jump-start your design and get you to production faster.


Quick reference to our documentation types.

1-5 of 21 documents

Show All

Design Resources

Select a section:

Design Files

1 design file

  • Design Files - miscellaneous

    KW41Z/31Z/21Z Design in check-list


1-5 of 10 hardware offerings

Show All


1-5 of 15 software files

Show All

Note: For better experience, software downloads are recommended on desktop.