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MRF24WB0MA/MRF24WB0MB
Data Sheet
2.4 GHz, IEEE Std. 802.11b™
RF Transceiver Module
© 2010 - 2011 Microchip Technology Inc.
DS70632B

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Note the following details of the code protection feature on Microchip devices:
• Microchip products meet the specification contained in their particular Microchip Data Sheet.
• Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the
intended manner and under normal conditions.
• There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our
knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data
Sheets. Most likely, the person doing so is engaged in theft of intellectual property.
• Microchip is willing to work with the customer who is concerned about the integrity of their code.
• Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not
mean that we are guaranteeing the product as “unbreakable.”
Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our
products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts
allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.
Information contained in this publication regarding device
applications and the like is provided only for your convenience
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
MICROCHIP MAKES NO REPRESENTATIONS OR
WARRANTIES OF ANY KIND WHETHER EXPRESS OR
IMPLIED, WRITTEN OR ORAL, STATUTORY OR
OTHERWISE, RELATED TO THE INFORMATION,
INCLUDING BUT NOT LIMITED TO ITS CONDITION,
QUALITY, PERFORMANCE, MERCHANTABILITY OR
FITNESS FOR PURPOSE. Microchip disclaims all liability
arising from this information and its use. Use of Microchip
devices in life support and/or safety applications is entirely at
the buyer’s risk, and the buyer agrees to defend, indemnify and
hold harmless Microchip from any and all damages, claims,
suits, or expenses resulting from such use. No licenses are
conveyed, implicitly or otherwise, under any Microchip
intellectual property rights.
DS70632B-page 2
Trademarks
The Microchip name and logo, the Microchip logo, dsPIC,
KEELOQ, KEELOQ logo, MPLAB, PIC, PICmicro, PICSTART,
PIC32 logo, rfPIC and UNI/O are registered trademarks of
Microchip Technology Incorporated in the U.S.A. and other
countries.
FilterLab, Hampshire, HI-TECH C, Linear Active Thermistor,
MXDEV, MXLAB, SEEVAL and The Embedded Control
Solutions Company are registered trademarks of Microchip
Technology Incorporated in the U.S.A.
Analog-for-the-Digital Age, Application Maestro, chipKIT,
chipKIT logo, CodeGuard, dsPICDEM, dsPICDEM.net,
dsPICworks, dsSPEAK, ECAN, ECONOMONITOR,
FanSense, HI-TIDE, In-Circuit Serial Programming, ICSP,
Mindi, MiWi, MPASM, MPLAB Certified logo, MPLIB,
MPLINK, mTouch, Omniscient Code Generation, PICC,
PICC-18, PICDEM, PICDEM.net, PICkit, PICtail, REAL ICE,
rfLAB, Select Mode, Total Endurance, TSHARC,
UniWinDriver, WiperLock and ZENA are trademarks of
Microchip Technology Incorporated in the U.S.A. and other
countries.
SQTP is a service mark of Microchip Technology Incorporated
in the U.S.A.
All other trademarks mentioned herein are property of their
respective companies.
© 2010 - 2011, Microchip Technology Incorporated, Printed in
the U.S.A., All Rights Reserved.
Printed on recycled paper.
ISBN: 978-1-61341-261-9
Microchip received ISO/TS-16949:2002 certification for its worldwide
headquarters, design and wafer fabrication facilities in Chandler and
Tempe, Arizona; Gresham, Oregon and design centers in California
and India. The Company’s quality system processes and procedures
are for its PIC® MCUs and dsPIC® DSCs, KEELOQ® code hopping
devices, Serial EEPROMs, microperipherals, nonvolatile memory and
analog products. In addition, Microchip’s quality system for the design
and manufacture of development systems is ISO 9001:2000 certified.
© 2010 - 2011 Microchip Technology Inc.

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MRF24WB0MA/MRF24WB0MB
MRF24WB0MA/MRF24WB0MB Data Sheet
2.4 GHz IEEE Std. 802.11b™
Features:
• IEEE Std. 802.11-compliant RF Transceiver
• Serialized unique MAC address
• Data Rate: 1 and 2 Mbps
• IEEE Std. 802.11b/g/n compatible
• Small size: 21mm x 31mm 36-pin Surface Mount
Module
• Integrated PCB antenna (MRF24WB0MA)
• External antenna option (MRF24WB0MB) with
ultra miniature coaxial (U.FL) connector
• Range: up to 400m (1300 ft.)
• Easy integration into final product – accelerates
product development, provides quicker time to
market
• Radio regulation certification for United States
(FCC), Canada (IC), Europe (ETSI) and Japan
(ARIB)
• Wi-Fi® certified (WFA ID: WFA7150)
• Designed for use with Microchip microcontroller
families (PIC18, PIC24, dsPIC33, and PIC32) with
downloadable Microchip TCP/IP Stack
Operational:
• Single operating voltage: 2.7V–3.6V (3.3V typical)
• Temperature Range: -20° C to +85° C extended
commercial
• Simple, four-wire SPI interface with interrupt
• Low-current consumption:
- RX mode – 85 mA (typical)
- TX mode – 154 mA (+10 dBm typical)
- Sleep – 250 µA (typical)
- Hibernate – <0.1 µA (typical)
RF/Analog Features:
• ISM Band 2.400–2.484 GHz operation
• 14 Channels selectable individually or domain-
restricted
• DSSS Modulation
• Data Rate – 1000 kbps
• -91 dBm Typical sensitivity at 1 Mbps
• +10 dBm Typical output power with control
• Integrated low phase noise VCO, RF frequency
synthesizer, PLL loop filter and PA
• Digital VCO and filter calibration
• Integrated RSSI ADC and I/Q DACs, RSSI
readings available to host
• Balanced receiver and transmitter characteristics
for low power consumption
MAC/Baseband Features:
• Hardware CSMA/CA access control, automatic
ACK, and FCS creation and checking
• Automatic MAC packet retransmit
• Hardware Security Engine for AES and
RC4-based ciphers
• Supports 802.1x, 802.1i security: WEP,
WPA-PSK, and WPA-2-PSK.
Applications:
• Utility and Smart Energy
- Thermostats
- Smart Meters
- White Goods
- HVAC
• Consumer Electronics
- Remote Control
- Internet Radio
- Home Security
- Toys
• Industrial Controls
- Chemical Sensors
- HVAC
- Security Systems
- M2M Communication
• Remote Device Management
- Location and Asset Tracking
- Automotive
- Code Update
• Retail
- POS Terminals
- Wireless Price Tags
- Digital Remote
• Medical, Fitness, and Health care
- Glucose Meters
- Fitness Equipment
- Patient Asset Tracking
© 2010–2011 Microchip Technology Inc.
DS70632B-page 3

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MRF24WB0MA/MRF24WB0MB
Pin Diagram
Note: Antenna connector on MRF24WB0MB only.
DS70632B-page 4
© 2010–2011 Microchip Technology Inc.

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MRF24WB0MA/MRF24WB0MB
Table of Contents
1.0 Devices Overview......................................................................................................................................................................... 7
2.0 Circuit Description ...................................................................................................................................................................... 13
3.0 Regulatory Approval................................................................................................................................................................... 23
4.0 Electrical Characteristics ............................................................................................................................................................ 27
Appendix A: Revision History............................................................................................................................................................... 31
The Microchip Web Site ....................................................................................................................................................................... 33
Customer Change Notification Service ................................................................................................................................................ 33
Customer Support ................................................................................................................................................................................ 33
Reader Response ................................................................................................................................................................................ 34
Product Identification System .............................................................................................................................................................. 35
TO OUR VALUED CUSTOMERS
It is our intention to provide our valued customers with the best documentation possible to ensure successful use of your Microchip
products. To this end, we will continue to improve our publications to better suit your needs. Our publications will be refined and
enhanced as new volumes and updates are introduced.
If you have any questions or comments regarding this publication, please contact the Marketing Communications Department via
E-mail at docerrors@microchip.com or fax the Reader Response Form in the back of this data sheet to (480) 792-4150. We
welcome your feedback.
Most Current Data Sheet
To obtain the most up-to-date version of this data sheet, please register at our Worldwide Web site at:
http://www.microchip.com
You can determine the version of a data sheet by examining its literature number found on the bottom outside corner of any page.
The last character of the literature number is the version number, (e.g., DS30000A is version A of document DS30000).
Errata
An errata sheet, describing minor operational differences from the data sheet and recommended workarounds, may exist for current
devices. As device/documentation issues become known to us, we will publish an errata sheet. The errata will specify the revision
of silicon and revision of document to which it applies.
To determine if an errata sheet exists for a particular device, please check with one of the following:
• Microchip’s Worldwide Web site; http://www.microchip.com
• Your local Microchip sales office (see last page)
When contacting a sales office, please specify which device, revision of silicon and data sheet (include literature number) you are
using.
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© 2010–2011 Microchip Technology Inc.
DS70632B-page 5