Product Brief
The BFR843EL3 is a low noise broadband NPN bipolar RF transistor. Its integrated feedback provides a broadband pre-match to 50 Ω at input and output and improves the stability against parasitic oscillations. These measures simplify the design of arbitrary LNA application circuits. The device is based on Infineon’s reliable high volume silicon germanium carbon (SiGe:C) heterojunction bipolar technology. The collector design supports voltages up to VCEO = 2.25 V and currents up to IC = 55 mA. The device is especially suited for mobile applications in which low power consumption is a key requirement. The transistor is fitted with internal protection circuits, which enhance the robustness against electrostatic discharge (ESD) and against high levels of RF input power. The device is housed in a very small thin leadless plastic package, ideal for modules.

FEATUREs
• Low noise broadband NPN RF transistor based on
   Infineon´s reliable, high volume SiGe:C bipolar technology
• High maximum RF input power and ESD robustness
• Unique combination of high RF performance, robustness
   and ease of application circuit design
• Low noise figure: NFmin = 1 dB at 2.4 GHz
   and 1.15 dB at 5.5 GHz, 1.8 V, 8 mA
• High gain |S21|2 = 22 dB at 2.4 GHz
   and 16.5 dB at 5.5 GHz, 1.8 V, 15 mA
• OIP3 = 22 dBm at 2.4 GHz and 5.5 GHz, 1.8 V, 25 mA
• Ideal for low voltage applications e.g. VCC = 1.2 V
   and 1.8 V (2.85 V, 3.3 V, 3.6 V requires corresponding
   collector resistor)
• Low power consumption, ideal for mobile applications
• Pb-free (RoHS compliant) and halogen-free very small
   thin leadless plastic package

APPLICATIONs
As Low Noise Amplifier (LNA) in
• Wireless Communications: WLAN IEEE802.11b,g,n,a,ac single- and dual band applications, broadband LTE or WiMAX LNA
• Satellite navigation systems (e.g. GPS, GLONASS, COMPASS...) and satellite C-band LNB (1st and 2nd stage LNA)
• Broadband amplifiers: Dualband WLAN, multiband mobile phone, UWB up to 10 GHz
• ISM bands up to 10 GHz
• Dedicated short range communication (DSRC) systems: WLAN IEEE802.11p