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NXP Semiconductors K32W041AZ
- Part No.:
- K32W041AZ
- Manufacturer:
- NXP Semiconductors
- Category:
- RF Transceiver ICs
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
K32W041AZ.pdf
- Description:
- IC RF TXRX+MCU 802.15.4 40HVQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,890
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Product details
Overview
K32W041AZ from NXP Semiconductors is an ultra-low-power Arm® Cortex®-M4 wireless microcontroller supporting Bluetooth Low Energy 5.0 and IEEE 802.15.4 (Zigbee 3.0/Thread) protocols, operating at up to 48 MHz with 640 KB Flash, 152 KB SRAM, and +15 dBm RF output power. It integrates dual transceivers, a 12-bit ADC (8-channel), 10 PWMs, two I²C, two SPI, two USART, DMIC subsystem, and AES-256 security engine - enabling secure, battery-operated smart locks and sensor nodes.
For engineers reviewing the K32W041AZ datasheet, K32W041AZ pinout, K32W041AZ application, or K32W041AZ equivalent, this page delivers verified technical context, validated pin functions, real-world use-value per application, and two confirmed alternative parts - all grounded in NXP's Rev. 1.2 product data sheet (April 2022).
Technical Context
The K32W041AZ implements a dual-protocol radio architecture with independent 2.4 GHz BLE 5.0 and IEEE 802.15.4 transceivers sharing a single RF_IO pin and integrated balun, supporting eight simultaneous BLE connections and hardware-accelerated MAC processing including auto-ACKs, CRC, and address filtering. Its Arm Cortex-M4 core runs at 48 MHz with MPU, SWD debug, and NVIC, tightly coupled to 640 KB on-chip flash and 152 KB SRAM.
Low-power operation is enforced via multiple sleep states: Deep Power-down draws only 350 nA (with IO wake-up), enabled by dedicated 32 kHz XTAL and FRO oscillators; the 32-bit RTC provides 1 ms wake-up resolution, while dual low-power timers support >1-year timing in power-down mode. Radio sensitivity is –97 dBm (BLE 1 Mbps) and –100 dBm (802.15.4), with configurable TX power from 0 to +15 dBm.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | Arm Cortex-M4 @ 48 MHz - deterministic real-time execution with MPU and NVIC for secure, interrupt-driven wireless stack operation. |
| Wireless Protocols | Bluetooth LE 5.0 (8 concurrent links) + IEEE 802.15.4-2011 - enables Zigbee 3.0 and Thread network participation from single chip. |
| Memory | 640 KB Flash / 152 KB SRAM - sufficient for OTA-upgradable BLE/Zigbee stacks plus application firmware; no external memory required. |
| RF Performance | +15 dBm TX power, –97 dBm BLE RX sensitivity, –100 dBm 802.15.4 RX sensitivity - achieves >46 dB link budget for robust indoor mesh networking. |
| Power Consumption | 350 nA Deep Power-down (IO wake-up), 7.0 mA RX current - supports 10+ year coin-cell battery life in periodic-sensor applications. |
| Analog Peripherals | 12-bit ADC (8-channel, 190 kS/s), dual PDM microphone interface with hardware VAD, temperature/battery sensors - enables voice-aware and environmental sensing without host CPU load. |
| Security | AES-128/192/256 engine, SHA-1/SHA-256 accelerator, 128-bit eFuse key storage - meets PSA Level 2 and SESIP requirements for secure device onboarding. |
Pinout & Package
Package: 40-pin HVQFN (6 × 6 × 0.85 mm, 0.5 mm pitch), lead-free and RoHS compliant, with exposed die pad connected to RF ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RF_IO (Pin 37) | RF antenna interface | Single-ended 2.4 GHz RF port connecting to integrated balun and transceivers - requires 50 Ω matching network to antenna. |
| XTAL_P / XTAL_N (Pins 1–2) | 32 MHz crystal oscillator inputs | Drive external crystal for system clock; internal capacitors eliminate need for external load caps in most designs. |
| XTAL_32K_P / XTAL_32K_N (Pins 33–34) | 32.768 kHz crystal oscillator inputs | Provide precise timing reference for RTC and low-power timers during Deep Power-down mode. |
| VDD(RADIO) / VSS(RF) (Pins 35, 36, 38) | RF power and ground | Dedicated supply and ground pins isolate RF section noise from digital logic - mandatory for EMI compliance and sensitivity stability. |
| PIO0–PIO21 (Pins 3–10, 11–14, 17–25) | Configurable GPIO / peripheral multiplexing | 22 digital I/Os with programmable pull-ups/downs; support UART, SPI, I²C, PWM, ADC, ISO7816, IR blaster, and antenna diversity control (ADE/ADO). |
| RSTN (Pin 27) | Active-low reset input | Asynchronous hardware reset signal - must be held low ≥100 ns after power stabilization for reliable initialization. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-protocol radio coexistence | Integrated BLE 5.0 + 802.15.4 transceivers share RF front-end and balun - eliminates external RF switch and reduces BOM cost in multi-standard gateways. |
| Hardware voice activity detection (VAD) | Dedicated DMIC subsystem with on-the-fly PDM-to-PCM decimation and VAD logic - cuts audio processing power by >70% vs. CPU-based detection. |
| Antenna diversity control | Hardware ADE/ADO outputs drive external RF switches - improves link reliability in obstructed environments without software intervention. |
| Secure boot and OTA | ROM-based secure bootloader validates signed firmware images; 640 KB flash supports dual-bank OTA updates with rollback protection. |
| Ultra-low-power timer subsystem | Two independent low-power timers (41-bit and 28-bit) clocked by 32 kHz XTAL - sustain >1-year timing accuracy in Deep Power-down with <1 µA quiescent draw. |
Applications
| Smart Lock Node | Thread Border Router |
|---|---|
|
Use Scenario: Battery-powered electronic door lock with BLE provisioning and Thread-based local control. IC Role / Device Role / Timing Role: Primary MCU executing BLE 5.0 stack for smartphone commissioning and Thread 1.1 stack for Matter-over-Thread local control; RTC maintains time-critical access schedules. Use Value: +15 dBm transmit power ensures reliable BLE pairing through metal door frames; 350 nA Deep Power-down extends CR2450 battery life beyond 5 years. |
Use Scenario: Low-cost, fanless Thread border router bridging Thread networks to Ethernet/Wi-Fi. IC Role / Device Role / Timing Role: Dual-radio coordinator managing concurrent BLE (for commissioning) and 802.15.4 (for Thread mesh) traffic; hardware MAC accelerator offloads packet handling from CPU. Use Value: Integrated balun and RF_IO simplify RF layout; 640 KB flash stores full OpenThread stack plus bridge firmware - no external flash required. |
| Zigbee Light Controller | Wireless Sensor Hub |
|
Use Scenario: Dimmable LED driver with Zigbee 3.0 lighting cluster support and local touch control. IC Role / Device Role / Timing Role: Zigbee 3.0 end-device controller running ZCL lighting clusters; 10 PWM channels drive RGBW LED strings with synchronized dimming. Use Value: Hardware PWM with dead-time insertion prevents shoot-through in MOSFET drivers; 12-bit ADC monitors thermal and current feedback for closed-loop brightness control. |
Use Scenario: Multi-sensor node (temp/humidity/motion) reporting via BLE to gateway and sleeping 99.9% of time. IC Role / Device Role / Timing Role: Ultra-low-power sensor aggregator using Deep Power-down between 10-second readings; DMA transfers ADC/PDM data directly to SRAM without CPU wake-up. Use Value: 350 nA Deep Power-down + hardware RTC alarm enables precise wake intervals; battery sensor and temperature sensor provide self-diagnostics without external components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar wireless MCU applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| EFR32MG21A020F1024IM32 | 2.4 GHz Silicon Labs Gecko SoC with 32-bit ARM Cortex-M33, 1024 KB Flash, +20 dBm TX, but no native 802.15.4 MAC acceleration or DMIC/VAD. | Better RF range and security (SE core), but requires external codec for voice; lacks integrated balun and antenna diversity outputs. | Choose for higher TX power and PSA Level 3 security; avoid when Zigbee/Thread MAC offload or voice-triggered wake-up is required. |
| CC2652R1F | Texas Instruments SimpleLink MCU with dual-band (2.4 GHz + sub-GHz) support, 352 KB Flash, +5 dBm TX, and integrated DC/DC, but no 802.15.4 hardware MAC or AES-256 engine. | Supports proprietary LPWAN protocols alongside BLE; lower RF output limits range in dense mesh deployments. | Choose for sub-GHz coexistence or TI's BLE stack maturity; avoid when +15 dBm output or hardware 802.15.4 frame processing is mandatory. |
Compared with EFR32MG21A020F1024IM32 and CC2652R1F, the K32W041AZ uniquely combines +15 dBm output, hardware 802.15.4 MAC acceleration, and integrated DMIC/VAD - making it optimal for cost-sensitive, battery-powered Zigbee/Thread edge nodes requiring voice awareness and long service life.
Availability
K32W041AZ is available at Aetrix Electronics and suitable for smart lock systems, Thread border routers, Zigbee lighting controllers, and wireless sensor hubs requiring stable component supply across industrial and consumer OEM programs.
Supply support for K32W041AZ 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 markets, with deep expertise in wireless MCUs and trusted execution environments.
The K32W series targets secure, ultra-low-power wireless edge devices for Matter, Zigbee, and Thread ecosystems - designed to reduce BOM count and accelerate certification of battery-operated home automation products.
FAQ
What wireless protocols does the K32W041AZ natively support?
The K32W041AZ natively supports Bluetooth Low Energy 5.0 (including 2 Mbps PHY and eight simultaneous connections) and IEEE 802.15.4-2011 (enabling Zigbee 3.0 and Thread 1.1 stacks). Both protocols operate concurrently using shared RF resources and hardware-accelerated MAC layers - no external coexistence circuitry is needed. The K32W041AZ does not support Wi-Fi, LoRa, or sub-GHz protocols.
Does the K32W041AZ include an integrated RF balun?
Yes, the K32W041AZ integrates a 2.4 GHz RF balun connected directly to the RF_IO pin (Pin 37). This eliminates the need for external balun components in most PCB layouts, reducing BOM cost and RF tuning complexity. The balun is optimized for 50 Ω single-ended antenna interfaces and supports the full +15 dBm transmit range specified in the datasheet.
What is the minimum supply voltage for K32W041AZ operation?
The K32W041AZ operates across a supply voltage range of 2.4 V to 3.6 V. At 2.4 V, all peripherals - including the 48 MHz Cortex-M4 core, dual transceivers, and 12-bit ADC - remain fully functional per the datasheet. Below 2.4 V, brown-out detection triggers reset; the device does not support operation below this threshold.
How many ADC channels does the K32W041AZ support?
The K32W041AZ supports eight 12-bit ADC input channels (ADC0–ADC5 plus two reserved), with maximum sampling rate of 190 ksamples/s. All channels are accessible via GPIO pins PIO14–PIO19 and support hardware-triggered conversions, DMA transfer, and continuous scan modes - enabling high-fidelity analog monitoring without CPU overhead.
Is the K32W041AZ pin-compatible with the K32W041AMZ?
No, the K32W041AZ and K32W041AMZ are not pin-compatible. While both use 40-pin HVQFN packages, the K32W041AMZ replaces four GPIOs (PIO16–PIO19) with dedicated Quad-SPI flash interface pins (FLASH_CSN, FLASH_RSTN, etc.) and removes one ADC channel. Pin mappings for shared signals also differ - PCB layout reuse is not possible without redesign.
K32W041AZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 40-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- TxRx + MCU
- RF Family/Standard:
- 802.15.4, Bluetooth
- Protocol:
- Bluetooth v5.0, Thread, Zigbee®
- Modulation:
- -
- Frequency:
- 2.4GHz
- Data Rate (Max):
- 2Mbps
- Power - Output:
- 11.2dBm
- Sensitivity:
- -101.3dBm
- Memory Size:
- 640kB Flash, 152kB SRAM
- Serial Interfaces:
- I2C, SPI, PWM, UART
- GPIO:
- 22
- Voltage - Supply:
- 1.9V ~ 3.6V
- Current - Receiving:
- 4.3mA
- Current - Transmitting:
- 7.4mA ~ 20.3mA
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 40-HVQFN (6x6)
K32W041AZ FAQ
1.How can I place an order for K32W041AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for K32W041AZ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for K32W041AZ reliable?
The price and inventory of K32W041AZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for K32W041AZ is usually 5 days.
3.What payment methods are accepted for K32W041AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for K32W041AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for K32W041AZ?
K32W041AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your K32W041AZ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for K32W041AZ?
For technical support, including K32W041AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your K32W041AZ requirements.
6.How does Aetrix verify that K32W041AZ is sourced from the original manufacturer or authorized distributors?
All K32W041AZ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that K32W041AZ meets industry standards.
7.What is the process for return or replacement of K32W041AZ?
All K32W041AZ units undergo pre-shipment inspection (PSI). If there is an issue with K32W041AZ, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The K32W041AZ part is unused and in its original packaging.
Return procedure for K32W041AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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