OBS418 / OBS419 - Classic Bluetooth modules

The OBS418 and OBS419 are stand-alone Classic Bluetooth modules with UART logic level interface for fast, secure, and transparent serial data transmissions up to 150 meters.

The OBS418 and OBS419 are stand-alone Classic Bluetooth modules with UART logic level interface for fast, secure, and transparent serial data transmissions up to 150 meters. With the embedded Bluetooth stack, you can be up and running quickly as there is no need for a driver or stack in your host.

The modules are easily configured via AT commands, offer Google Android connectivity and have implemented the u-blox Low Emission Mode® to make sure that Classic Bluetooth operates smoothly in parallel with other wireless technologies.

The OBS418 features Bluetooth v2.1 (SPP, DUN), 350 kbps throughput, and one-slave connectivity.

The OBS419 features Bluetooth v2.1+EDR (SPP, DUN, PAN), deep power save mode, 950 kbps throughput, and three-slave multipoint connectivity. Further features implemented include Wireless Multidrop™ and Extended Data Mode™ for individually controlled multipoint data channels.

Options include internal antenna versions or versions with connector for external antenna. There is also a wide selection of certified external antennas to choose from.

The modules are fully Bluetooth qualified and provide modular radio type approvals for the US, Europe, Japan and Canada (FCC, R&TTE, MIC, IC). The modules are also compliant with EMC, Safety and Medical standards.

The operating temperature range is -30° C to +85° C.


  • Bluetooth v2.1 / v2.1 + EDR
  • Embedded Bluetooth stack
  • Serial port application firmware for UART serial data
  • Up to 1 Mbps throughput
  • Advanced multipoint capability with up to three slavesbluetooth-logo--120px
  • u-blox Low Emission Mode®


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

Parameters Specifications

OBS418: v2.1 (Classic Bluetooth)

OBS419: v2.1 + EDR (Classic Bluetooth)


75m, internal antenna

150m, external antenna

Output power

6 dBm, internal antenna

8 dBm, external antenna


OBS418: 350 kbps

OBS419: 950 kbps

Electrical data
RF power supply 3.0 to 6.0VDC
Power consumption

OBS418: 12 mA @ 3.0 V (min.)

OBS419: 0.6 mA @ 3.0 V (min.) 20 mA @ 3.0 V (average Tx)

Software features
Embedded software

u-blox Bluetooth stack

Serial port application

Bluetooth profiles

OBS418/419: Serial Port Profile (SPP)

OBS418/419: Dial-up networking Profile (DUN GW, DUN DT) OBS419: Personal Area Networking Profile (PAN) roles: PANU & NAP

Max. number of slaves

OBS418: 1

OBS419: 3

Configuration tools

AT commands via Bluetooth or serial port

Serial Port Toolbox (Windows-based SW)

Low Emission Mode®

Prevent disrupting other 2.4GHz radios

Wireless Multidrop¹

Possible with simultaneous connections to several devices without adding software to the host system.

Extended Data Mode¹ Individually controlled multipoint data channels
Quality of Service (QoS) Yes
Repeater functionality¹ Extended range
Security Simple Pairing
Android connectivity SPP Classic Bluetooth with Android devices
¹ Applies to OBS419 only
UART Logic level
RS232 (option via external transceiver)
RS422/485 (option via external transceiver)
Baud rate

OBS418: 460.8 kbit/s (max.)

OBS419: 1.25 Mbit/s (max.)

Support for non-standard baud rates

Flow control CTS/RTS (hardware) or none
GPIO pins 9
U.FL antenna connector (external antenna version only)



16.0 x 36.0 x 3.2 mm (internal antenna)

16.0 x 36.0 x 2.6 mm (external antenna)




Mounting holes

Machine mountable

Board-to-board connector

Solder land pads

Environmental data, quality & reliability

Operating temperature -30°C to +85°C
Certifications and approvals
Type approvals

Europe (ETSI R&TTE)

US (FCC/CFR 47 part 15 unlicensed modular transmitter approval)

Canada (IC RSS)

Japan (MIC - formerly TELEC)

R&TTE Directive 1999/5/EC

Effective use of frequency spectrum: EN 300 328

EMC: EN 301 489-1, EN 301 489-17, EN 61000-6-2

Health and safety: EN 62479, EN 60950-1, IEC 60950-1

Medical Electrical Equipment IEC 60601-1-2
Bluetooth Qualification

OBS418: v2.1

OBS419: v2.1 + EDR


Click here for the u-blox short range radio modules linecard (PDF).

Part No. Description Pack Size
CB-OBS418I-04 OBS418 module with on-board antenna Reel of 250
CB-OBS418X-04 OBS418 module with U.FL connector for external antenna Reel of 250
CB-OBS419I-04 OBS419 module with on-board antenna Reel of 250
CB-OBS419X-04 OBS419 module with U.FL connector for external antenna Reel of 250
Support Products

Includes the OBS419i-04 module with additional JST connector, USB module adapter (installs virtual COM-port), USB extension cable, JST to flying leads cable, and configuration software.

* To evaluate the OBS418, order the module separately.


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Last updated: 16 June 2017