Infineon Technologies BF776E6327FTSA1

Overview

BF776E6327FTSA1 from Infineon Technologies is a high-performance NPN bipolar RF transistor optimized for low-noise amplifier (LNA) stages in 1.8 GHz and 6 GHz wireless front-ends, featuring a typ. 0.8 dB noise figure at 1.8 GHz, 46 GHz transition frequency (f_T), and 24 dB maximum stable power gain at 1.8 GHz. It operates with V_CEO = 4.0 V, I_C = 50 mA, and is packaged in RoHS-compliant SOT343 for WLAN, GPS, UMTS/LTE, and ISM-band receivers.

For engineers reviewing the BF776E6327FTSA1 datasheet, BF776E6327FTSA1 pinout, BF776E6327FTSA1 application, or BF776E6327FTSA1 equivalent, key selection criteria include verified noise performance at 1.8 GHz, S-parameter-supported transducer gain (21.5 dB @ 1.8 GHz), third-order intercept point (IP3 = 28 dBm), and thermal resistance R_thJS ≤ 300 K/W for compact RF layout integration.

Technical Context

This transistor employs a silicon bipolar process optimized for RF linearity and noise minimization in narrowband and wideband receive paths. Its f_T of 46 GHz and C_cb = 0.09 pF enable stable amplification up to 6 GHz while maintaining low intermodulation distortion - confirmed by measured IP3 of 28 dBm and P-1dB of 13 dBm at 1.8 GHz under 50 Ω terminations.

The device uses a four-terminal SOT343 package with dual emitter leads (Pins 2 & 4), enabling improved thermal dissipation and reduced emitter inductance critical for broadband LNA stability. DC biasing is supported by h_FE = 180 (typ.) at I_C = 30 mA / V_CE = 3 V, and its Z_Sopt-matched configuration delivers minimum noise figure without external matching networks.

Key Specifications

Pinout & Package

Package: SOT343 - surface-mount plastic package with visible leads, RoHS-compliant, ESD-sensitive (Class 1C per JEDEC JS-001), footprint optimized for RF layout with low parasitic inductance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-noise RF transistor applications.

Compared with BFP740FESD and MMA040407-12, BF776E6327FTSA1 offers the best balance of noise figure and gain at 1.8 GHz without sacrificing thermal or ESD margins - making it optimal for cost-sensitive, high-volume GPS and WLAN modules where Z_Sopt matching is feasible.

Availability

BF776E6327FTSA1 is available at Aetrix Electronics and suitable for GPS receivers, WLAN access points, and UMTS/LTE user equipment requiring stable component supply, consistent RF performance across production lots, and RoHS-compliant packaging.

Supply support for BF776E6327FTSA1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Infineon Technologies AG is a German semiconductor manufacturer specializing in power management, automotive ICs, and high-frequency devices, with global R&D centers and ISO/TS 16949-certified wafer fabs.

The BF776 belongs to Infineon's BFP/BF high-frequency bipolar transistor product line, engineered specifically for low-noise, high-gain RF amplification in sub-6 GHz wireless infrastructure and portable terminals.

FAQ

What is the recommended bias condition for minimum noise figure?

For minimum noise figure (0.8 dB typ.), bias the BF776E6327FTSA1 at I_C = 5 mA and V_CE = 3 V with source impedance matched to Z_Sopt ≈ 10 + j15 Ω. This condition is validated in the datasheet's noise parameter tables and confirmed via on-wafer S-parameter measurements at 1.8 GHz.

Can this transistor be used in 5 GHz Wi-Fi 802.11ac applications?

Yes - the BF776E6327FTSA1 delivers |S21|² = 11 dB and G_ma = 12.5 dB at 6 GHz, and its 46 GHz f_T supports stable 5 GHz operation. Measured transducer gain remains >15 dB across 4.9–5.9 GHz with proper 50 Ω matching, making it viable for 802.11ac LNA stages.

Is the SOT343 package lead-free and RoHS-compliant?

Yes - the BF776E6327FTSA1 uses a Pb-free (lead-free) SOT343 package fully compliant with EU RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 1. The "FTSA1" suffix explicitly denotes RoHS-compliant, halogen-free, and green packaging.

Does Infineon provide SPICE models and S-parameters for this part?

Yes - Infineon publishes verified SPICE models and full 2-port S-parameters (including noise parameters) for the BF776 on its RF models portal (www.infineon.com/rf.models). These files are updated quarterly and validated against production lots using on-wafer RF probing at 0.1–6 GHz.