Infineon Technologies BFP 540F E6327

Overview

BFP540F E6327 from Infineon Technologies is an NPN silicon RF transistor optimized for low-noise, high-gain amplifier stages at 1.8 GHz, featuring 20 dB maximum available power gain (G_ms), 0.9 dB noise figure (F), 30 GHz typical transition frequency (f_T), 0.14 pF collector-base capacitance (C_cb), and TSFP-4 surface-mount package with dual emitter leads. It is used in cellular front-end LNA modules for GSM/UMTS handsets.

For engineers reviewing the BFP540F E6327 datasheet, BFP540F E6327 pinout, BFP540F E6327 application, or BFP540F E6327 equivalent, key selection criteria include noise figure at 1.8 GHz, transducer gain under 50 Ω terminations, f_T vs. bias current dependency, thermal resistance R_thJS ≤ 280 K/W, and dual-emitter layout impact on grounding strategy in RF matching networks.

Technical Context

This RF transistor employs a gold-metallized Si bipolar process for high reliability and stable high-frequency performance. Its Gummel-Poon SPICE model includes verified parasitic inductances (e.g., L_BI = 0.42 nH, L_CI = 0.35 nH) and coupling coefficients (e.g., K_EO-CO = 0.11), enabling accurate S-parameter simulation up to 6 GHz.

The TSFP-4 package integrates two electrically parallel emitter terminals to reduce series inductance, while its internal equivalent circuit accounts for lead inductance asymmetry and inter-terminal coupling-critical for broadband impedance matching and stability analysis in 1–3 GHz designs.

Key Specifications

Pinout & Package

Package: TSFP-4 (Thin Small-Outline Transistor, 4-pin, lead pitch 0.5 mm, body size 1.4 × 1.2 × 0.55 mm). Dual emitter configuration reduces emitter inductance and improves high-frequency stability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BFP420F and NE68133, the BFP540F E6327 uniquely balances sub-1 dB noise figure, 30 GHz f_T, and dual-emitter layout for compact 1.8 GHz handset LNAs-making it irreplaceable in space-constrained, battery-powered mobile designs requiring best-in-class RF efficiency.

Availability

BFP540F E6327 is available at Aetrix Electronics and suitable for cellular handset LNA design, GPS/GNSS receiver front-ends, and automotive telematics RF modules requiring stable component supply across multi-year production cycles.

Supply support for BFP540F 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 ICs, and high-performance discrete devices, with global R&D and manufacturing facilities.

The BFP540F belongs to Infineon's BFP family of silicon RF transistors, engineered specifically for low-noise, high-gain amplifier applications in 0.8–6 GHz wireless infrastructure and mobile终端 equipment.

FAQ

What is the recommended DC bias condition for optimal noise figure at 1.8 GHz?

For minimum noise figure (0.9 dB), operate at I_C = 5 mA and V_CE = 2 V with source impedance Z_S = Z_Sopt ≈ 15 + j10 Ω. This condition is validated in the datasheet's AC characteristics table and confirmed by on-wafer S-parameter measurements.

Can the two emitter pins be used independently in circuit design?

No-the TSFP-4 package internally connects both emitter terminals (Pins 2 and 4); they are electrically identical and must be grounded together. Using them separately violates the package equivalent circuit model and degrades RF performance due to unbalanced current paths.

Is the BFP540F E6327 compliant with RoHS and REACH regulations?

Yes-Infineon confirms full RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006 compliance for BFP540F E6327, with lead-free matte tin termination and halogen-free molding compound, as documented in Infineon's material declaration ID 2022-00187.

How does thermal resistance R_thJS translate to practical PCB layout guidance?

R_thJS ≤ 280 K/W assumes measurement at the collector lead soldering point. To achieve this, use ≥4 thermal vias (0.3 mm diameter, filled) directly under the collector pad, connect to inner-layer copper pour, and maintain ≥1 mm clearance from adjacent heat sources to avoid localized junction temperature exceedance.