OBS421 - Stand-alone Dual-mode Bluetooth modules

Proven dual-mode Bluetooth modules with best performance and multi-point functionality

The powerful stand-alone Bluetooth module OBS421 is a dual-mode Bluetooth module complete with embedded Bluetooth dual mode stack and serial port application. The OBS421 features a UART interface for transparent serial data transmissions. It can be used as a dual-mode Bluetooth client for any host and it can access any dual-mode Bluetooth device that implements services based on the Generic Attribute Profile (GATT).

The OBS421 can also be used in devices connected to smartphones, tablets and laptops via the Serial Port Profile.

The module is fully Bluetooth qualified and provides modular radio type approvals for the US, Canada, Europe, Japan and China. The OBS421 is also compliant with EMC, Safety and Medical standards.


  • Bluetooth v4.0 with Bluetooth low energy and Bluetooth BR/EDR (dual‑mode Bluetooth)
  • Embedded stack (SPP, DUN, PAN, GATT)
  • Low Emission Mode® limits interference with other 2.4GHz RF
  • u‑blox Low Energy Serial Port Service
  • High throughput of 1.3 Mbps
  • Advanced multipoint capability with 7 slaves
  • High speed iAP2 connectivity

For sales and technical development support from our in-house engineering team, please contact the Alpha Micro team.

OBS421_Product Selector

Click here for the u-blox Short Range Radio modules linecard.

Part No. Description Pack Size
CB-OBS421I-24 OBS421 module (Rev. B) with on-board antenna, supports Apple iOS connections (Bluetooth Low Energy only). Reel of 250
CB-OBS421X-24 OBS421 module (Rev. B) with U.FL connector for external antenna, supports Apple iOS connections (Bluetooth Low Energy only) Reel of 250
Modules with iAP support for Classic Bluetooth connections to Apple iOS devices*
CB-OBS421I-I4 OBS421 module with iAP support and on-board antenna Reel of 250
CB-OBS421X-I4 OBS421 module with iAP support and U'FL connector for external antenna Reel of 250

* All current OBS421 module versions support Apple iOS connections via Bluetooth low energy. Classic Bluetooth connections are supported only by OBS421 versions with iAP support, but other special requirements also apply, see http://tinyurl.com/ndk6vj2.

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Last updated: 19 February 2018