Infineon Technologies BFR380L3E6327XTMA1

Overview

BFP540ESD from Infineon is a silicon NPN RF bipolar transistor in SOT343 package, designed for low-noise amplification at 1.8 GHz with NFmin = 0.9 dB, Gms = 21.5 dB, OIP3 = 24.5 dBm, and 1 kV HBM ESD robustness. It serves as the active gain element in broadband LNAs for DVB-T, DAB/DMB, and LNB local oscillators.

For engineers reviewing the BFP540ESD datasheet, BFP540ESD pinout, BFP540ESD application, or BFP540ESD equivalent, key selection criteria include noise figure at 1.8 GHz, transducer gain under 2 V / 20 mA bias, ESD tolerance, SOT343 thermal resistance (RthJS = 290 K/W), and fT ≥ 21 GHz for RF front-end stability.

Technical Context

The BFP540ESD employs Infineon's SIEGET™ grounded-emitter architecture to minimize base resistance and parasitic capacitance, enabling high fT (21–30 GHz) and low CCB (0.14–0.24 pF). Its ESD protection structure integrates robust diode clamping without degrading RF performance.

It operates with DC bias of VCE = 2 V and IC = 5–20 mA, delivering stable small-signal gain and noise performance across 0.9–3 GHz bands. The device is qualified per JEDEC JESD47/JESD22 and AEC-Q101 for industrial and automotive-grade reliability.

Key Specifications

Pinout & Package

Package: SOT343 - surface-mount plastic package with 4 terminals, optimized for RF layout (low-inductance emitter grounding, minimal lead inductance).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BFP540ESD, BFP640FESD offers lower noise and higher fT in a larger package, while MMA040407-12 delivers marginally better linearity at higher supply voltage but lacks automotive qualification and ESD robustness at system level.

Availability

BFP540ESD is available at Aetrix Electronics and suitable for DVB-T tuners, satellite LNB modules, DAB/DMB receivers, and cordless phone RF front-ends requiring stable component supply, consistent parametric performance, and long-term industrial lifecycle support.

Supply support for BFP540ESD 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, RF, and automotive electronics, with global manufacturing and quality certification to ISO/TS 16949 and IATF 16949.

The BFP540ESD belongs to Infineon's fifth-generation SIEGET™ RF bipolar transistor family, engineered specifically for high-linearity, low-noise amplification in cost-sensitive consumer and industrial wireless receivers.

FAQ

What is the recommended bias condition for minimum noise figure?

The BFP540ESD achieves NFmin = 0.9 dB at VCE = 2 V and IC = 5 mA. This bias point requires precise base current control via resistive divider or active current source; emitter degeneration is not needed due to inherent SIEGET™ low-noise topology.

Can BFP540ESD replace BFP420 in existing LNA designs?

Yes, with minor layout adjustment: both use SOT343 and share pinout (B-E-C-E), but BFP540ESD improves NFmin by 0.3 dB and OIP3 by 2.5 dBm at same 2 V / 20 mA bias, and adds 1 kV HBM ESD protection absent in BFP420.

Is thermal derating required above 77 °C soldering point temperature?

Yes - total power dissipation must be linearly reduced above TS = 77 °C per Figure 1 in the datasheet; at TS = 100 °C, Ptot is limited to ~180 mW to maintain TJ ≤ 150 °C, requiring careful thermal pad design and copper pour on the emitter leads.

Does the dual-emitter configuration require separate grounding paths?

No - Pins 2 and 4 are internally connected emitters and must be tied to the same low-inductance RF ground plane; splitting them introduces imbalance, degrades noise matching, and increases parasitic inductance, compromising 1.8 GHz performance.