Infineon Technologies BFP420FH6327XTSA1

Overview

BFP540ESDH6327XTSA1 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 FM/AM radio front-ends.

For engineers reviewing the BFP540ESDH6327XTSA1 datasheet, BFP540ESDH6327XTSA1 pinout, BFP540ESDH6327XTSA1 application, or BFP540ESDH6327XTSA1 equivalent, key selection criteria include noise figure at 5 mA bias, transducer gain at 20 mA, OIP3 linearity, ESD rating, and SOT343 thermal resistance (RthJS = 290 K/W).

Technical Context

This grounded-emitter (SIEGET™) RF transistor operates in common-emitter configuration with emitter terminals on pins 2 and 4, collector on pin 3, and base on pin 1. Its 21 GHz minimum fT and 0.14–0.24 pF CCB support stable 1.8–3 GHz small-signal amplification under 2 V VCE bias.

The device uses a fifth-generation silicon process qualified to JEDEC JESD47/JESD22 and AEC-Q101 for industrial reliability. Its ESD-hardened structure delivers typical 1 kV HBM without external protection, enabling direct integration into cost-sensitive LNA modules.

Key Specifications

Pinout & Package

SOT343 (SC-82AB) surface-mount plastic package with 4 leads, 1.3 mm × 1.3 mm footprint, and 0.95 mm height. Thermal pad on underside not electrically connected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BFP540ESDH6327XTSA1, BFP420FH6327XTSA1 trades bandwidth for lower noise, while MMA040407-12 sacrifices both noise and ruggedness for unit cost reduction-making the BFP540ESD optimal for industrial DVB-T and automotive DAB designs demanding balanced NF/OIP3/robustness.

Availability

BFP540ESDH6327XTSA1 is available at Aetrix Electronics and suitable for DVB-T tuners, CATV distribution amplifiers, DAB/DMB receivers, and FM/AM broadcast front-ends requiring stable component supply across production lifecycles.

Supply support for BFP540ESDH6327XTSA1 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, automotive, and RF solutions, 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-yield, low-cost LNA modules in broadcast and wireless infrastructure where ESD robustness and noise-linearity trade-offs are tightly constrained.

FAQ

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

Minimum noise figure (NFmin = 0.9 dB) is achieved at VCE = 2 V, IC = 5 mA, with base biased through a 10 kΩ resistor and emitter grounded via low-inductance path. The SIEGET™ structure requires both emitter pins (2 and 4) to be simultaneously connected to RF ground for optimal noise performance.

Can BFP540ESDH6327XTSA1 be used in 5G sub-6 GHz infrastructure?

No-its fT minimum of 21 GHz and measured Gma = 14 dB at 3 GHz indicate diminishing gain margin above 2.7 GHz. It is validated for DVB-T (≤862 MHz), DAB (≤240 MHz), and LTE Band 40 (2.3 GHz), but not optimized for 3.5 GHz or 4.9 GHz 5G NR channels requiring >18 dB gain and <1.2 dB NF.

Is thermal pad soldering required for reliable operation?

No-the SOT343 package has no internal thermal pad; heat is conducted through leads. RthJS = 290 K/W is measured at the emitter lead soldering point (TS). To maintain TJ ≤ 150 °C, keep TS ≤ 77 °C by using ≥2 cm² copper pour on emitter traces and minimizing trace length to ground planes.

How does the dual-emitter configuration affect layout?

The dual-emitter (pins 2 and 4) must be symmetrically routed to identical low-inductance RF grounds. Unequal trace lengths introduce phase imbalance, degrading stability and increasing NF by up to 0.3 dB. Use mirrored microstrip stubs or shared thermal relief pads to ensure equal parasitic inductance on both emitter paths.