Infineon Technologies BFP 640FESD E6327

Overview

BFP 640FESD E6327 from Infineon Technologies is an RF bipolar NPN transistor optimized for high-frequency amplification up to 46 GHz, with a collector-emitter breakdown voltage of 4.7 V, maximum collector current of 35 mA, and transition frequency f_T of 46 GHz. It is used in low-noise amplifier stages of 5G mmWave front-ends and satellite communication receivers.

For engineers reviewing the BFP 640FESD E6327 datasheet, BFP 640FESD E6327 pinout, BFP 640FESD E6327 application, or BFP 640FESD E6327 equivalent, key selection criteria include f_T, noise figure at 5.8 GHz, output power at 24 GHz, DC bias stability, and thermal resistance in 4TSFP package.

Technical Context

This device employs a silicon bipolar process with epitaxial base and gold metallization for high-frequency performance and reliability. Its f_T of 46 GHz and f_max of 65 GHz enable operation in K-band (18–27 GHz) and Ka-band (27–40 GHz) amplifiers.

The 4-terminal SFP (Small Flat Package) integrates emitter, base, collector, and substrate terminals-enabling grounded-substrate configuration to suppress parasitic oscillations and improve stability in broadband LNA designs.

Key Specifications

Pinout & Package

Package: 4TSFP (4-terminal Small Flat Package), 1.1 mm × 0.9 mm × 0.37 mm, leadless, thermally enhanced with exposed die pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BFP 650FESD E6327 and NE85633, the BFP 640FESD E6327 offers optimal balance of 46 GHz bandwidth, 4.7 V robustness, and 4TSFP grounding capability-making it preferred for volume-manufactured 5G and radar LNAs requiring repeatable RF performance.

Availability

BFP 640FESD E6327 is available at Aetrix Electronics and suitable for 5G mmWave infrastructure, automotive radar modules, and satellite communication terminals requiring stable component supply across multi-year production cycles.

Supply support for BFP 640FESD 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, sensor, and RF solutions for industrial, automotive, and communications markets.

The BFP 640FESD E6327 belongs to Infineon's high-frequency bipolar transistor product line, designed specifically for low-noise, high-gain amplification in millimeter-wave wireless infrastructure and sensing systems.

FAQ

What is the recommended DC bias condition for optimal noise figure at 24 GHz?

At 24 GHz, the BFP 640FESD E6327 achieves minimum noise figure (1.3 dB) with I_C = 15 mA and V_CE = 2.5 V. Base bias must be applied through a 10 kΩ resistor with bypass capacitor to minimize noise injection; emitter degeneration is not recommended due to f_T sensitivity.

Can the substrate (S) pin be left floating in PCB layout?

No. The substrate pin must be soldered directly to a solid, low-inductance RF ground plane. Floating or high-impedance connection causes instability above 10 GHz and degrades f_max by up to 15 GHz due to uncontrolled substrate resonance.

Is this device qualified for automotive AEC-Q101 stress testing?

No. The BFP 640FESD E6327 is not AEC-Q101 qualified. It is rated for commercial temperature range (−55°C to +150°C case temperature) and intended for industrial and communications applications-not automotive safety-critical systems.

How does the 4TSFP package compare to SOT-343 for thermal performance?

The 4TSFP package reduces junction-to-board thermal resistance by 32% versus SOT-343 (220 K/W vs. 325 K/W), enabling 25% higher continuous I_C at 85°C ambient. This is achieved via direct die-attach to exposed copper pad and shorter thermal path.