BT121 Long Range BT 4.1 Smart Ready Module Apple MFI

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Silicon Labs BT121-A-V1-IAP is a Bluetooth Smart Ready module targeted for applications that require both Bluetooth Smart and Classic connectivity. It can connect to legacy devices that only support Bluetooth SPP or Apple iAP2 (Apple MFI license required) profiles as well to devices that support Bluetooth Smart.

BT121 integrates a high performance Bluetooth radio, a low-power ARM Cortex micro-controller and a Bluegiga Bluetooth Smart Ready stack software marking it extremely easy-to-use as no RF or Bluetooth software development is needed. BT121 can be used as a modem together with a separate host MCU, but applications can also be embedded into the built-in ARM Cortex MCU with the Bluegiga BGScriptTM scripting language.


The BT121 combines has a high performance Bluetooth radio, a low power MCU and Bluetooth Smart Ready stack software. It’s easy to use and provides connectivity to Windows, Android and Apple devices and additionally allows customer applications to be programmed on the built-in MCU.



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Bluetoothv.4.1 dual mode:
- Supports master and slave modes
- Up to 6 x BR/EDR and 7 x BLE connections
- 1x BR/EDR + 7 x BLE connections
Radio Performance:
- Transmit power : +10 (BLE) / 12 dBm (BR/EDR)
- Receiver sensitivity: -96 dBm
- Link budget 106 dB
- Range 200-400 meters
Low Current Consumption:
- Full EDR transmit55 mA
- BLE connected 170 uA
- Power mode 2 60 uA
- Power mode 2, radio OFF7uA*
- Sleep with RTC wake-up3 uA*
IntegratedBluetoothSmart Ready stack:
- SPP, iAP2 for Bluetooth Classic
- GATT over BR
- Common GAP, SMP and L2CAP
- ATT and GATT for Bluetooth Smart
- Any BluetoothSmart profile(s)
FlexiblePeripheral Interfaces:
- UART, SPI and I2C serial interfaces
- PWM*,GPIO with interrupts
- 12-bit ADC and DAC
Host Interfaces:
Compact Size:
- 11.0 mm x 13.9 mm x 2.2 mm
- 153 mm2
RTC with calendar alarms*
Programmable ARM Cortex-M0 processor:
- 16kb RAM / 256 kB Flash
Bluetooth, CE, FCC, IC, South-Korea and Japan qualified
*Apple MFI license required
Temperature: -40C to +85C

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