Infineon Technologies BFR 705L3RH E6327

Overview

BFR 705L3RH E6327 from Infineon Technologies is an NPN silicon germanium RF transistor optimized for ultra-low-noise, high-gain LNA operation at low collector current (7 mA). It delivers 0.5 dB noise figure at 1.8 GHz and 0.8 dB at 6 GHz, with 25 dB maximum stable gain at 1.8 GHz and 18 dB at 6 GHz, in a TSLP-3-9 leadless package (0.32 mm max height) for 5G front-end modules and GPS receivers.

For engineers reviewing the BFR 705L3RH E6327 datasheet, BFR 705L3RH E6327 pinout, BFR 705L3RH E6327 application, or BFR 705L3RH E6327 equivalent, key selection criteria include verified noise figure below 0.8 dB up to 6 GHz, f_T of 39 GHz, C_cb ≤ 0.08 pF, V_CEO = 4 V, and AEC-Q101 qualification for automotive radar front-ends.

Technical Context

This SiGe NPN transistor employs heterojunction bipolar technology to achieve high f_T (39 GHz) and ultra-low capacitance (C_cb = 0.04–0.08 pF, C_eb = 0.18 pF), enabling broadband amplification from sub-1 GHz to 10 GHz. Its low V_CEO (4 V) and I_C rating (10 mA) reflect optimization for low-voltage, low-power RF signal chains.

Thermal design is constrained by R_thJS ≤ 665 K/W and P_tot = 40 mW at T_S ≤ 123 °C, with pulse derating curves confirming suitability for burst-mode GNSS and LTE-M receive paths where duty cycle < 5%.

Key Specifications

Pinout & Package

Package: TSLP-3-9 - ultra-thin (0.32 mm max height), leadless surface-mount package with exposed thermal pad; RoHS-compliant, AEC-Q101 qualified.

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 BFR 705L3RH E6327 uniquely combines AEC-Q101 qualification, sub-0.8 dB NF up to 6 GHz, and 39 GHz f_T in a 0.32 mm profile-making it the sole choice for space-constrained, automotive-grade 5G and GNSS front ends.

Availability

BFR 705L3RH E6327 is available at Aetrix Electronics and suitable for GPS/GNSS receivers, 5G sub-6 GHz front ends, and automotive radar systems requiring stable component supply across multi-year production cycles.

Supply support for BFR 705L3RH 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, automotive, and RF solutions, with global R&D centers and ISO/TS 16949-certified wafer fabs.

The BFR 705L3RH E6327 belongs to Infineon's SiGe RF transistor product line, engineered specifically for ultra-low-noise, high-frequency amplification in automotive radar, satellite navigation, and cellular infrastructure.

FAQ

What is the recommended DC bias condition for minimum noise figure?

For minimum noise figure, operate at I_C = 3 mA and V_CE = 3 V with source impedance matched to Z_Sopt (typically 15–25 Ω real + j5–j10 Ω reactive). This condition yields 0.5 dB NF at 1.8 GHz and is validated per Infineon's application note AN321. Bias stability requires emitter degeneration resistor ≤ 10 Ω to avoid thermal runaway.

Is the TSLP-3-9 package compatible with standard reflow profiles?

Yes-the TSLP-3-9 package is qualified for IPC/JEDEC J-STD-020D-compliant lead-free reflow, with peak temperature ≤ 260 °C for ≤ 30 seconds. Board layout must include thermal vias under the exposed pad (minimum 4×0.3 mm diameter) connected to inner ground planes to maintain R_thJS ≤ 665 K/W during operation.

Does the AEC-Q101 qualification cover full temperature range operation?

AEC-Q101 qualification covers operation from −40 °C to +125 °C ambient, including temperature cycling (1000 cycles, −40 °C ↔ +125 °C), high-temperature operating life (1000 h at 125 °C), and ESD testing (HBM ≥ 2 kV). Electrical parameters are guaranteed only over TA = −40 °C to +85 °C per datasheet limits.

Can this transistor be used in common-base configuration for broadband amplification?

Yes-common-base configuration is supported with verified transducer gain |S₂₁|² = 21 dB at 1.8 GHz and 14 dB at 6 GHz under 50 Ω terminations. Input return loss remains >10 dB across 1–8 GHz, but base terminal must be AC-grounded via low-inductance capacitor (≥100 pF) and DC-biased through ≥1 kΩ resistor to prevent oscillation.