Arm Cortex-M0+|Kinetis KW40Z 2.4 GHz 32-bit MCUs

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Note: K32W061/41 is preferred for any new Zigbee^®, Thread and Bluetooth^® LE 5.0 design. No new software releases planned

The KW40Z is a highly-integrated single-chip device that enables Bluetooth^® Smart/Bluetooth^® Low Energy v4.1 and IEEE^® 802.15.4-2011 RF connectivity for portable, extremely low-power embedded systems. Applications include portable healthcare devices, wearable sports and fitness devices, AV remote controls, computer keyboards and mice, gaming controllers, access control, security systems, smart energy and home area networks.

The KW40Z MCU integrates a 2.4 GHz transceiver supporting a range of FSK/GFSK and O-QPSK modulations, an Arm^® Cortex^®-M0+ CPU, 160 KB Flash and 20 KB SRAM, Bluetooth Low Energy Link Layer hardware, 802.15.4 packet processor, hardware security and peripherals optimized to meet the requirements of the target applications. The KW40Z has enough on-chip memory to concurrently run both a Bluetooth Low Energy stack and an IEEE 8021.5.4 MAC/PHY for multi-mode applications.

Data Sheet

Reference Manual

Product Details

Block Diagram

Kinetis W Series KW40Z MCUs Block Diagram

Get diagram PDF

Features

Multi-Protocol Radio

2.4 GHz Bluetooth Low Energy version 4.1 Compliant
IEEE Std. 802.15.4-2011 Standard Compliant
Typical Receiver Sensitivity (Bluetooth Low Energy) = -91 dBm
Typical Receiver Sensitivity (802.15.4) = -102 dBm
Programmable Transmitter Output Power: -20 dBm to +5 dBm

Core and Memories

Up to 48 MHz Arm^® Cortex^®-M0+ core
On-chip 160 KB Flash memory
On-chip 20 KB SRAM

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
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)

Security

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

Supported Software

Bluetooth Low Energ Host Stack and Profiles, 802.15.4 MAC and SMAC
Kinetis^® Software Development Kit (SDK)
The FreeRTOS kernel and a bare-metal non-preemptive task scheduler

Comparison Table

Kinetis KW40Z Family Recommended Solutions

Part Number	Wireless Connectivity Protocol	Package Size	Hardware Development Tool
MKW40Z160VHT4	Bluetooth Low Energy and IEEE 802.15.4	7 mm x 7 mm x 1 mm 48-pin Laminate QFN	FRDM-KW40Z USB-KW40Z
MKW30Z160VHM4	Bluetooth Low Energy	5 mm x 5 mm x 1 mm 32-pin Laminate QFN
MKW20Z160VHT4	IEEE 802.15.4	7 mm x 7 mm x 1 mm 48-pin Laminate QFN

MCUXpresso Software and Tools

MCUXpresso Config Tools – A comprehensive suite of system configuration tools, including pins, clocks, SDK builder and more.

MCUXpresso SDK – An open-source software development kit (SDK) built specifically for your processor and evaluation board selections.

MCUXpresso IDE – An easy-to-use integrated development environment (IDE) for creating, building, debugging, and optimizing your application.

Protocol Stacks

Connectivity Software

Kinetis Connectivity Software Version 1.0.1 includes the following components:

KW40Z Bluetooth^® low energy v4.2 stack, v1.1.4
KW40Z IEEE^® 802.15.4-2006/2011 MAC/PHY implementation v5.2.4
KW40Z Simple Media Access Controller (SMAC) v3.2.4
KW40Z-enabled Connectivity Framework

NXP Designs: Reference Design Library

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

Buy/Parametrics

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Documentation

Quick reference to our documentation types

1-10 of 22 documents

Compact List

Compact Planar Antennas for 2.4 GHz Communication[AN2731]

HTML | PDFJul 21, 2025Rev 6.0
MKW4xZ/3xA/2xZ DCDC Power Management[AN5025]

PDFJun 7, 2021Rev 3
Use of 40-bit MAC Address in Kinetis® Wireless Microcontrollers[AN12272]

PDFOct 10, 2018Rev 0
MKW40Z Power Consumption Analysis[AN5272]

PDFSep 25, 2016Rev 1
FRDM-KW40Z Demo Application User's Guide[FRDMKW40ZDAUG]

PDFSep 6, 2016Rev 0
MKW40Z PHY Test Using Direct Test Mode[AN5179]

PDFMar 20, 2016Rev 1
Hardware Design Considerations for MKW40Z/30Z/20Z BLE and IEEE 802.15.4 Devices[AN5202]

PDFOct 28, 2015Rev 1
Wireless Coexistence in the 2.4 GHz Band[AN5185]

PDFSep 17, 2015Rev 0
Reference Oscillator Crystal Requirements for MKW40 and MKW30 Device Series[AN5177]

PDFSep 16, 2015Rev 0

MKW40Z/30Z/20Z Data Sheet[MKW40Z160]

PDFMay 1, 2018Rev 1.2

Kinetis KW40Z/30Z/20Z Wireless MCUs Fact Sheet[KNTSKW40ZFS]Featured

PDFJun 12, 2015Rev 0

MKW40Z/30Z/20Z Reference Manual[MKW40Z160RM]

PDFSep 28, 2022Rev 1.4.1
KW40 ZumoBot API Reference Manual[KW40ZBAPIRM]

PDFOct 12, 2015Rev 0

IoT Toolbox Mobile Application User Manual[UM11087]

PDFDec 19, 2017Rev 0
Software Porting From MKW40Z to MKW30Z and MKW20Z Wireless MCUs[MKWSWPUG]

PDFJan 12, 2016Rev 0
KW40 ZumoBot Reference Design User's Guide[KW40ZBRDUG]

PDFJan 6, 2016Rev 1
FRDM-KW40Z Freescale Freedom Development Board[FRDMKW40ZUG]

PDFOct 12, 2015Rev 2
Freescale Reference Design Board KW40-HRM-RD User's Guide[KW40HRMRDUG]

PDFOct 12, 2015Rev 0
KW40 Heart Rate Monitor Using Bluetooth Low Energy User's Guide[KW40HRMUG]

PDFOct 12, 2015Rev 0
Freescale USB Development Board USB-KW40Z User's Guide[USBKW40ZUG]

PDFOct 12, 2015Rev 0
Bluetooth Low Energy Heart Rate Monitor Reference Design[BLEHRMRDUG]

PDFOct 12, 2015Rev 0
IoT Low Power Sensor Node Reference Design Board User's Guide[ILOSENORDUG]

PDFOct 5, 2015Rev 0

Design Resources

Design Files

Quick reference to our design files types.

1 design file

Receive the full breakdown. See the product footprint and more in the eCad file.

Symbols and Footprints
Kinetis^® Symbols, Footprints and Models

INTERNALRev 1.0Nov 27, 2017 11:23:001 KBCAD-SYMBOLFOOTPRINTS

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Hardware

Quick reference to our board types.

1-5 of 8 hardware offerings

Evaluation and Development Boards
Bluetooth Low Energy/IEEE^® 802.15.4 Packet Sniffer USB Dongle for Kinetis^® KW40Z/30Z/20Z MCUsFeatured
Active

USB-KW40Z
Evaluation and Development Boards
FRDM Development Platform for Kinetis^® KW40Z/30Z/20Z MCUsFeatured
Active

FRDM-KW40Z
Emulators, Probes, and Programmers
Universal Multilink Development Interface
Active

UMultilink
Additional hardware available. View our featured partner solutions.
Emulators, Probes, and Programmers
PEmicro Cyclone programmer
Active

CYCLONE
Emulators, Probes, and Programmers
PEmicro Cyclone FX programmer

CYCLONE-FX
Emulators, Probes, and Programmers
LPC-Link2
Active

OM13054
Emulators, Probes, and Programmers
Universal Multilink FX High-Speed Development Interface
Active

U-MULTILINK-FX
Evaluation and Development Boards
Bluetooth Low Energy/IEEE^® 802.15.4 Packet Sniffer/USB Dongle
Active

USB-KW41Z

Show All

1-5 of 12 hardware offerings

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Multilink Debug Probes

Multilink debug probes are BDM/JTAG debug probes for various NXP devices. Universal models support SWO debug in NXP's MCUXpresso IDE. FX model features high-speed com...

By P & E Microcomputer Systems, Inc Gold Partner
Test Accessories and Debugger
Flasher Portable PLUS

Flasher Portable PLUS is an extremely portable flash programmer, specifically designed to meet the needs of production-grade flash programming in the field.

By SEGGER Microcontroller GmbH Gold Partner
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J-Link PRO PoE

J-Link PRO PoE is a specialized programming / debug probe for creating test farms. It can draw power via Ethernet and supplies power to the target either via debug interf...

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J-Link PRO

J-Link PRO is an enhanced version of the SEGGER J-Link. This emulator supports ARM/Cortex devices. This has an Ethernet interface in addition to the USB interface. This ...

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Flasher Hub-12

The Flasher Hub-12 controls up to 12 Flasher Compacts so that they program simultaneously, creating a powerful gang programmer for efficient high-speed parallel programmi...

By SEGGER Microcontroller GmbH Gold Partner
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Flasher PRO

Flasher PRO is SEGGER’s “almost-anything” flash programmer for microcontrollers, SoCs, and (Q)SPI flashes.

By SEGGER Microcontroller GmbH Gold Partner
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TRACE32® Debug and Trace tools for Arm®-based NXP MPUs/MCUs

TRACE32® provides a complete suite of tools for all NXP's Arm®-based microprocessors. All of these provide unparalleled levels of debug capabilities to get the best o...

By Lauterbach GmbH Gold Partner
Test Accessories and Debugger
TRACE32® CombiProbe 2 Compact Trace for NXP Microcontrollers

CombiProbe 2 enables full insight into what an embedded system is doing at run-time. Besides its comprehensive debug capabilities, the trace simplifies system profiling o...

By Lauterbach GmbH Gold Partner
Test Accessories and Debugger
TRACE32® PowerDebug System for NXP Microcontrollers/Microprocessors

PowerDebug is Lauterbach's powerful, modular, flexible debug system. It provides the broadest coverage of supported chips and core architectures in the embedded i...

By Lauterbach GmbH Gold Partner
Test Accessories and Debugger
J-Link ULTRA+

The J-Link ULTRA+ is three times faster than the industry standard J-Link, at a 3 MBytes/s download speed to RAM. It comes complete with J-Flash, and Unlimited Flash Brea...

By SEGGER Microcontroller GmbH Gold Partner