OBS421 series

Stand-alone dual-mode Bluetooth modules

OBS421 series is an older generation product. For new designs see:

Stand-alone Bluetooth 5.0 low energy modules with NFC

Stand-alone dual-mode Bluetooth modules

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

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

Standard

Professional

Automotive

CB-OBS421i-24

Internal antenna

CB-OBS421x-24

U.FL antenna connector

Product Selection

Documentation & resources

Product variants	CB-OBS421i-24	CB-OBS421x-24
Interfaces
UART	✓
GPIO x 9	✓
Electrical data
Maximum supply [V]	6
Minimum supply [V]	3
Environmental data, quality & reliability
Maximum temperature [°C]	85
Minimum temperature [°C]	-30
Features
AT command support	✓
Extended data mode protocol	✓
General features
Antennas	Internal antenna	Connector (active) for external antenna
Dimensions
Dimensions [mm]	36 x 16 x 2.6