Infineon Technologies BFR 740L3 E6327

Overview

BFR740L3 E6327 from Infineon Technologies is an NPN silicon germanium RF transistor optimized for ultra-low-noise, high-gain amplification in wireless front-ends up to 6 GHz. It delivers 0.5 dB noise figure at 1.8 GHz and 24 dB maximum stable gain at same frequency, with gold metallization and TSLP-3-8 package for high reliability in CDMA and WLAN receiver LNA stages.

For engineers reviewing the BFR740L3 E6327 datasheet, BFR740L3 E6327 pinout, BFR740L3 E6327 application, or BFR740L3 E6327 equivalent, key selection criteria include noise figure vs. frequency, Z_Sopt impedance mapping, f_T = 42 GHz, pulse-tested AC performance, and thermal resistance R_thJS ≤ 350 K/W under PCB-solder-point measurement conditions.

Technical Context

This SiGe NPN transistor uses heterojunction bipolar technology to achieve f_T = 42 GHz and f_max > 150 GHz, enabling broadband operation from 0.9–6 GHz. Its low C_cb = 0.1 pF (typ.) and C_eb = 0.38 pF (typ.) support wideband matching and minimal Miller effect.

Designed for fixed-bias or active-bias LNA topologies, it operates at V_CE = 3 V and I_C = 8–25 mA, with verified IP3 = 25 dBm and P_-1dB = 11 dBm at 1.8 GHz under 50 Ω terminations - critical for linear receiver chain design.

Key Specifications

Pinout & Package

Package: TSLP-3-8 - ultra-thin, leadless surface-mount package with 0.5 mm pitch, 0.39 mm height, and exposed collector pad for thermal enhancement.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BFP740FESD and NE85633, the BFR740L3 E6327 offers the best combination of noise performance, bandwidth, and miniaturized TSLP-3-8 footprint - making it optimal for space-constrained, high-frequency LNA designs requiring repeatable pulse-verified RF metrics.

Availability

BFR740L3 E6327 is available at Aetrix Electronics and suitable for CDMA base station receivers, Wi-Fi 6 client LNAs, and 5G sub-6 GHz UE front-ends requiring stable component supply across production ramps and long-life programs.

Supply support for BFR740L3 E6327 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 is a German semiconductor manufacturer specializing in power management, RF, automotive, and security ICs, with leadership in SiGe and GaN process technologies.

The BFR740L3 belongs to Infineon's BFR series of ultra-low-noise SiGe RF transistors, engineered specifically for high-performance receiver front-ends in wireless infrastructure and mobile devices operating below 6 GHz.

FAQ

What is the recommended bias condition for minimum noise figure?

For minimum noise figure at 1.8 GHz, bias the BFR740L3 E6327 at IC = 8 mA and VCE = 3 V. The optimal source impedance ZSopt is 50 + j15 Ω - achievable with a 2-element L-network or microstrip stub. This condition yields F = 0.5 dB and is validated across production lots per Infineon Application Note AN345.

Can this transistor be used in common-base configuration?

Yes - the BFR740L3 E6327 supports common-base operation with verified S-parameter data up to 6 GHz. At IC = 25 mA, VCB = 3 V, it provides |S21|² = 12 dB at 6 GHz and input return loss >12 dB. However, common-emitter remains preferred due to higher gain and better noise match with standard 50 Ω systems.

Is the TSLP-3-8 package compatible with standard reflow profiles?

Yes - the TSLP-3-8 package is qualified for IPC/JEDEC J-STD-020D-compliant lead-free reflow, with peak temperature ≤ 260°C for ≤ 30 seconds. Board layout must follow Infineon's recommended stencil aperture (0.38 × 0.2 mm) and copper pad (0.95 × 0.5 mm) to ensure void-free solder joint formation on the exposed collector pad.

How does ESD sensitivity impact handling and assembly?

The BFR740L3 E6327 is ESD-sensitive (HBM Class 1B, ≤250 V). Handling requires grounded wrist straps, dissipative mats, and ionized air. During assembly, avoid direct contact with pins, use ESD-safe feeders, and verify conveyor static voltage <100 V. Post-reflow cleaning must exclude solvents that degrade gold metallization integrity.