| Parameters | 
                                
                                                                                                            
                                            | Factory Lead Time | 
                                            12 Weeks | 
                                        
                                                                            
                                            | Mount | 
                                            Surface Mount | 
                                        
                                                                            
                                            | Mounting Type | 
                                            Surface Mount | 
                                        
                                                                            
                                            | Package / Case | 
                                            Module | 
                                        
                                                                            
                                            | Number of Pins | 
                                            36 | 
                                        
                                                                            
                                            | Operating Temperature | 
                                            -40°C~85°C | 
                                        
                                                                            
                                            | Packaging | 
                                            Tape & Reel (TR) | 
                                        
                                                                            
                                            | Published | 
                                            2014 | 
                                        
                                                                            
                                            | Part Status | 
                                            Active | 
                                        
                                                                            
                                            | Moisture Sensitivity Level (MSL) | 
                                            3 (168 Hours) | 
                                        
                                                                            
                                            | Number of Terminations | 
                                            36 | 
                                        
                                                                            
                                            | Voltage - Supply | 
                                            2V~3.6V | 
                                        
                                                                            
                                            | Terminal Position | 
                                            UNSPECIFIED | 
                                        
                                                                            
                                            | Terminal Form | 
                                            NO LEAD | 
                                        
                                                                            
                                            | Number of Functions | 
                                            1 | 
                                        
                                                                            
                                            | Supply Voltage | 
                                            3V | 
                                        
                                                                            
                                            | Terminal Pitch | 
                                            0.9mm | 
                                        
                                                                            
                                            | Frequency | 
                                            2.4GHz | 
                                        
                                                                            
                                            | Operating Supply Voltage | 
                                            3.6V | 
                                        
                                                                            
                                            | Interface | 
                                            I2C, SPI, UART | 
                                        
                                                                            
                                            | Memory Size | 
                                            256kB Flash 8kB SRAM | 
                                        
                                                                            
                                            | Max Supply Current | 
                                            36mA | 
                                        
                                                                            
                                            | Data Rate | 
                                            2Mbps | 
                                        
                                                                            
                                            | Utilized IC / Part | 
                                            CC2541 | 
                                        
                                                                            
                                            | Protocol | 
                                            Bluetooth v4.0 | 
                                        
                                                                            
                                            | Telecom IC Type | 
                                            TELECOM CIRCUIT | 
                                        
                                                                            
                                            | Power - Output | 
                                            8dBm | 
                                        
                                                                            
                                            | RF Family/Standard | 
                                            Bluetooth | 
                                        
                                                                            
                                            | Antenna Type | 
                                            Integrated, Chip | 
                                        
                                                                            
                                            | Number of ADC Channels | 
                                            8 | 
                                        
                                                                            
                                            | Serial Interfaces | 
                                            I2C, SPI, UART | 
                                        
                                                                            
                                            | Current - Receiving | 
                                            28mA~33mA | 
                                        
                                                                            
                                            | Current - Transmitting | 
                                            25mA~39mA | 
                                        
                                                                            
                                            | Sensitivity (dBm) | 
                                            -98 dBm | 
                                        
                                                                            
                                            | Number of GPIO | 
                                            16 | 
                                        
                                                                            
                                            | Height | 
                                            1.8mm | 
                                        
                                                                            
                                            | Length | 
                                            14.7mm | 
                                        
                                                                            
                                            | Width | 
                                            13mm | 
                                        
                                                                            
                                            | RoHS Status | 
                                            RoHS Compliant | 
                                        
                                                                                                    
                            
                         
                                                BLE121LR-A-M256K Overview
This RF Transceiver' mounting method is Surface Mount.For optimal performance, this RF Transceiver module makes use of the Tape & Reel (TR) package.In this RF Transceiver module, there are a total of 36 terminations.Keeping Transceiver's operating temperature at -40°C~85°C is essential when operating.There are 36 pins that are used for the operation of the high power RF Transceiver.RF Transceivers with 2V~3.6V voltage capabilities can be used.The RF Transceiver Module operates at a frequency of 2.4GHz.In many applications, this Transceiver  is mounted with a Surface Mount bus.
BLE121LR-A-M256K Features
Surface Mount
Tape & Reel (TR) package
36 terminations
36 pins
2V~3.6V volts
BLE121LR-A-M256K Applications
There are a lot of Silicon Labs BLE121LR-A-M256K RF Transceiver Modules applications. 
- HVAC
 - Remote Control
 - Internet Radio
 - Utility and Smart Energy
 - Medical
 - Internet of Things (IoT)
 - Industrial Controls
 - Consumer Electronics
 - Home and Security
 - Digital Remote