Microchip Technology Inc.

RN-42 Class 2 Bluetooth Module

The RN-42 is a small form factor, low power, class 2 Bluetooth radio. It was engineered specifically for designers who want to add wireless capability to their products without adding a lot of complexity and cycle time. The RN-42 supports multiple interface protocols, is simple to design in, and is fully certified, so it doesn’t add to medical device designers’ regulatory burden. It is a complete embedded Bluetooth solution. The RN-42 is functionally compatible with the Class 1 RN 41. With its high-performance, on-chip antenna and support for Bluetooth EDR, the RN-42 delivers up to a 3 Mbps data rate for distances up to 20 meters.

The RN-42 is also available in a package without an antenna (RN-42-N). Useful when the application requires an external antenna, the RN-42-N is shorter in length and has RF pads to route the antenna signal.

For maximum compatibility with installed Bluetooth-enabled medical devices, the RN-42 supports Bluetooth version 2.1 + Enhanced Data Rate (EDR) and is backwards-compatible with Bluetooth version 2.0, 1.2, and 1.1 as well as Bluetooth data link to iPhone/iPad/iPod Touch.


  • Agency-certified in the USA, Canada and Europe for minimal regulatory hassles
  • Complete Bluetooth SIG qualified radio module adds wireless capability without RF design
  • 128-bit encryption for secure data communications
  • Programmable low power modes for portable/handheld devices
  • On-board embedded Bluetooth stack allows use with or without a host processor



  • Class 2 radio, 60’ (20m) distance, 4 dBm output transmitter, -80dBm typical receive sensitivity
  • Sustained SPP data rates: 240 Kbps (slave), 300 Kbps (master)
  • HCI data rates: 1.5 Mbps sustained, 3.0 Mbps burst in HCI mode
  • 3.3/5V logic CMOS I/O (RS-232 as well)


Many clinical and home use medical devices can be realized or improved by the addition of wireless technology, including patient monitors, weight scales, portable data terminals and blood pressure meters.


The RN-41 and RN-42 Bluetooth Modules are available in full production today. In addition, the RN-42-SM evaluation board and RN-42-HID-RD1 reference design are available to support new designs.

Contact Information

Microchip Technology Inc.

2355 W. Chandler Blvd.
Chandler, AZ, 85224

tele: 480.792.7200
toll-free: 888.MCU.MCHP
fax: 480.792.7277

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