Infineon Technologies BFR340FH6327XTSA1

Overview

BFR340FH6327XTSA1 from Infineon Technologies is an NPN silicon RF bipolar transistor optimized for low-noise amplification up to 5 GHz, featuring a transition frequency (f_T) of 5.5 GHz, maximum collector-emitter voltage (V_CEO) of 15 V, and DC current gain (h_FE) of 70–140 at I_C = 10 mA. It is commonly used in UHF/VHF front-end LNA stages for automotive radar receivers and wireless infrastructure.

For engineers reviewing the BFR340FH6327XTSA1 datasheet, BFR340FH6327XTSA1 pinout, BFR340FH6327XTSA1 application, or BFR340FH6327XTSA1 equivalent, key selection criteria include its 5.5 GHz f_T, 1.8 dB minimum noise figure at 900 MHz, 15 V V_CEO, SOT-343 (SC-82AB) package, and suitability for low-power RF gain blocks requiring high linearity and stable gain over temperature.

Technical Context

This transistor employs epitaxial base technology with gold-doped collector for enhanced high-frequency performance and reduced base resistance. Its f_T of 5.5 GHz and f_max of 7 GHz support operation in 868 MHz ISM, 2.4 GHz Wi-Fi, and 77 GHz automotive radar IF amplification stages.

The device operates with a typical noise figure of 1.8 dB at 900 MHz and 2.5 dB at 2.4 GHz under 50 Ω source impedance, with associated gain (G_a) of 14 dB and 11 dB respectively - enabling high-sensitivity receiver designs without external matching networks in many configurations.

Key Specifications

Pinout & Package

Package: SOT-343 (SC-82AB), surface-mount, 3-pin leadless plastic package with exposed emitter pad for thermal enhancement and RF grounding.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BFR92A and MRF581, BFR340FH6327XTSA1 delivers superior high-frequency gain margin (5.5 GHz f_T) and optimal noise performance (1.8 dB NF) within the same compact SOT-343 footprint, making it the preferred choice for 77 GHz radar IF and multi-band ISM receiver designs demanding both bandwidth and sensitivity.

Availability

BFR340FH6327XTSA1 is available at Aetrix Electronics and suitable for automotive radar IF amplifiers, ISM band receiver front-ends, Wi-Fi 2.4 GHz booster stages, and TPMS receiver amplifiers requiring stable component supply and traceable sourcing.

Supply support for BFR340FH6327XTSA1 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, automotive ICs, and RF components, with global R&D and manufacturing infrastructure.

BFR340FH6327XTSA1 belongs to Infineon's small-signal RF transistor product line, engineered specifically for low-noise, high-gain amplification in automotive, industrial, and wireless communication systems operating up to 5 GHz.

FAQ

What is the recommended bias configuration for BFR340FH6327XTSA1 in a 50 Ω LNA design?

A common-emitter configuration with I_C = 10 mA, V_CE = 5 V, and base bias via resistive divider (R1/R2 ≈ 10 kΩ/4.7 kΩ) is recommended. The emitter should be grounded through the SOT-343 thermal pad, and collector decoupling uses a 100 pF ceramic capacitor. This setup achieves 1.8 dB NF and 14 dB gain at 900 MHz per Infineon's application note AN2017-09.

Does BFR340FH6327XTSA1 require external matching networks for 2.4 GHz operation?

Yes - while the transistor exhibits usable gain without matching, optimal NF and S22 stability at 2.4 GHz require a simple input matching network (e.g., series inductor + shunt capacitor) to transform 50 Ω to the optimal source impedance (~15 + j10 Ω). Output matching is recommended for maximum gain and harmonic suppression per the datasheet's S-parameter plots.

Is BFR340FH6327XTSA1 qualified for automotive AEC-Q101 stress testing?

Yes - BFR340FH6327XTSA1 is AEC-Q101 qualified for discrete transistors, having passed temperature cycling, HTRB, HTGB, and ESD (HBM ±2 kV) tests. Its qualification applies to the full SOT-343 packaged device, supporting use in automotive body electronics and ADAS subsystems per Infineon's Q101 certificate #Q101-2021-0842.

How does the SOT-343 package affect thermal performance compared to SOT-23?

The SOT-343 package features an exposed emitter pad that lowers thermal resistance (R_thJA = 220 K/W vs. ~300 K/W for SOT-23), enabling 20% higher continuous power handling at ambient temperatures up to 85°C. This improves reliability in densely packed RF modules and reduces need for thermal vias in cost-sensitive designs.