Infineon Technologies BFR740L3RHE6327XTSA1

Overview

BFR740L3RHE6327XTSA1 from Infineon is a SiGe:C NPN RF heterojunction bipolar transistor (HBT) optimized for low-noise, high-gain amplification in 5G/Wi-Fi front-ends. It delivers NFmin = 0.5 dB at 1.9 GHz (3 V, 6 mA), Gms = 20 dB at 5.5 GHz (3 V, 15 mA), and fT = 42 GHz, housed in a TSLP-3-9 leadless package. It serves as a low-noise amplifier (LNA) stage in GNSS receivers and WLAN 5–6 GHz band modules.

For engineers reviewing the BFR740L3RHE6327XTSA1 datasheet, BFR740L3RHE6327XTSA1 pinout, BFR740L3RHE6327XTSA1 application, or BFR740L3RHE6327XTSA1 equivalent, key selection criteria include noise figure vs. frequency trade-off, gain flatness across 1.5–5.5 GHz, DC bias stability at 3 V, and thermal resistance (RthJS = 280 K/W) for compact RF PCB layouts.

Technical Context

This HBT leverages silicon-germanium carbon (SiGe:C) epitaxial base technology to achieve high fT and low 1/f noise. Its heterojunction structure enables superior cutoff frequency and improved breakdown voltage versus standard Si BJTs.

The device operates with fixed VCE = 3 V bias and supports IC tuning from 6 mA (low-noise mode) to 15 mA (high-gain mode). Its S-parameter-based AC performance is characterized in 50 Ω test fixtures with Bias-Ts, enabling direct integration into impedance-matched RF signal chains without external matching networks at design center frequencies.

Key Specifications

Pinout & Package

Package: TSLP-3-9 - ultra-thin (0.35 mm height), leadless surface-mount package with wettable flank terminations for automated optical solder-joint inspection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BFP740FESD and NE85633, the BFR740L3RHE6327XTSA1 offers the lowest noise figure across 1.5–5.5 GHz and JEDEC-qualified reliability for space-constrained, battery-operated wireless receivers-making it optimal for next-gen GNSS/Wi-Fi coexistence designs.

Availability

BFR740L3RHE6327XTSA1 is available at Aetrix Electronics and suitable for GNSS navigation systems, 5 GHz Wi-Fi front-ends, and portable TV tuners requiring stable component supply across high-volume production cycles.

Supply support for BFR740L3RHE6327XTSA1 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, and automotive ICs, with leadership in SiGe RF transistor technology since 2003.

The BFR740L3RHE6327XTSA1 belongs to Infineon's BFR7xx family of SiGe:C HBTs, engineered specifically for ultra-low-noise, high-linearity RF amplification in consumer and industrial wireless infrastructure.

FAQ

What is the recommended DC bias configuration for optimal noise figure at 2.4 GHz?

For minimum noise figure at 2.4 GHz, set VCE = 3 V and IC = 6 mA using a 500 Ω base resistor and 10 nF emitter bypass capacitor. The datasheet specifies NFmin = 0.5 dB under these conditions, and the TSLP-3-9 package requires thermal vias under the emitter pad to maintain junction temperature ≤85 °C.

Can BFR740L3RHE6327XTSA1 replace BFR92A in existing 2.4 GHz WLAN designs?

No - BFR92A is a Si BJT with fT ≈ 7 GHz and NFmin = 1.4 dB at 2.4 GHz, while BFR740L3RHE6327XTSA1 is a SiGe:C HBT with fT = 42 GHz and NFmin = 0.5 dB. Direct replacement requires re-optimization of input/output matching networks and bias resistors due to 3× higher transconductance and 5× lower capacitance.

Is the TSLP-3-9 package compatible with standard reflow profiles for lead-free assembly?

Yes - the TSLP-3-9 package is qualified for IPC/JEDEC J-STD-020D moisture sensitivity level 1 and supports peak reflow temperatures up to 260 °C. Recommended profile uses ramp rate ≤3 °C/s, soak at 150–200 °C for 60–120 s, and peak at 245–260 °C for ≤10 s, per Infineon's packaging specification document.

Does this transistor require external ESD protection in the RF path?

Yes - the device is rated ESD-sensitive (HBM Class 1B, 250 V), and the datasheet explicitly warns against handling without grounded wrist straps. While CCB = 0.12 pF provides some inherent RF shunting, discrete 0201-size TVS diodes (e.g., Infineon ESD204-B1-W02) are recommended before the base and collector pins in production designs.