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

Part numbers include: MKW41Z256VHT4, MKW41Z512CAT4, MKW41Z512VHT4.

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

Design Files

1 design file


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.

Engineering Services

1-5 of 16 engineering services

Show All

To find a complete list of our partners that support this product, please see our Partner Marketplace.