Infineon Technologies BFR 181W E6327

Overview

BFR181W E6327 from Infineon Technologies is a low-noise silicon bipolar RF transistor designed for broadband amplifier stages in 900 MHz and 1.8 GHz cellular front-ends. It delivers f_T = 8 GHz, NF_min = 0.9 dB at 900 MHz, and h_FE = 70–140 at I_C = 5 mA, V_CE = 8 V, enabling high-gain, low-noise amplification in compact SOT323 packages.

For engineers reviewing the BFR181W E6327 datasheet, BFR181W E6327 pinout, BFR181W E6327 application, or BFR181W E6327 equivalent, key selection criteria include verified noise figure at 900 MHz/1.8 GHz, transducer gain under 50 Ω matching, thermal resistance (R_thJS = 345 K/W), and AEC-Q101 qualification for automotive-grade reliability.

Technical Context

This NPN RF transistor operates with collector-emitter voltage up to 12 V and supports DC bias currents from 0.5 mA to 12 mA for optimized noise and gain trade-offs. Its f_T of 8 GHz and C_cb = 0.29 pF (typ.) enable stable broadband amplification up to 1.8 GHz with minimal parasitic coupling.

The device uses a grounded-emitter configuration with defined pinout (1=B, 2=E, 3=C) and exhibits I_CES ≤ 100 µA at V_CE = 20 V and I_EBO ≤ 1 µA at V_EB = 1 V, ensuring low leakage in battery-powered RF stages.

Key Specifications

Pinout & Package

Package: SOT323 - surface-mount, RoHS-compliant, halogen-free package with visible leads and AEC-Q101 qualification.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BFR181W E6327, BFP181W E6327 offers identical RF performance and qualification with packaging variance, while MRF581 trades noise and frequency capability for lower cost and larger footprint-making it viable only where AEC-Q101 and 8 GHz f_T are not required.

Availability

BFR181W E6327 is available at Aetrix Electronics and suitable for GSM/EDGE handset front-ends, automotive telematics receivers, and ISM-band wireless sensor nodes requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for BFR181W 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 AG is a German semiconductor manufacturer specializing in power management, RF, and automotive ICs, with global R&D and wafer fabrication infrastructure.

The BFR181W belongs to Infineon's RF bipolar transistor product line, engineered specifically for low-noise, high-frequency amplification in mobile communications and automotive connectivity systems.

FAQ

What is the maximum allowable collector current for continuous operation?

The absolute maximum collector current is 20 mA, but for reliable long-term operation at TA = 25 °C, the datasheet specifies optimal DC bias between 0.5 mA and 12 mA to maintain NF_min ≤ 0.9 dB and prevent thermal runaway. At I_C = 12 mA, V_CE must be limited to ≤8 V to stay within P_tot = 175 mW.

Is the BFR181W E6327 suitable for 5G NR sub-6 GHz bands?

No. While its f_T = 8 GHz supports stable gain up to ~1.8 GHz, the device's |S21e| drops to 10 dB at 1.8 GHz and is not characterized beyond that frequency. It is validated only for GSM, EDGE, UMTS, and 868 MHz ISM applications-not for 3.5 GHz or 4.9 GHz 5G NR bands.

How does the AEC-Q101 qualification impact board-level design?

AEC-Q101 qualification confirms the device passes accelerated stress tests including temperature cycling (−40 °C to +125 °C, 1000 cycles), HTRB (1000 hrs at 150 °C), and ESD (HBM ≥2 kV). Designers must still observe JEDEC J-STD-020 MSL1 handling, avoid mechanical stress on SOT323 leads, and ensure thermal vias under the collector pad match R_thJS test conditions.

Can the BFR181W E6327 be used in common-base configuration?

Yes-the device's C_cb = 0.29 pF and C_eb = 0.35 pF support common-base use, but the datasheet only provides S-parameter data and noise models for common-emitter topology. For common-base, designers must characterize input/output impedance, gain, and stability independently using the published C_cb, C_eb, and h_FE values.