Infineon Technologies BFP420H6433XTMA1

Overview

BFP420H6433XTMA1 from Infineon Technologies is a low-noise silicon bipolar RF transistor optimized for high-gain, low-noise amplification at 1.8 GHz, featuring NFmin = 1.1 dB, Gms = 21 dB, fT = 25 GHz, VCEO = 4.5 V, and IC = 60 mA. It is used in cellular front-end LNA stages, GPS receivers, and ISM-band transceivers requiring high linearity and thermal stability.

For engineers reviewing the BFP420H6433XTMA1 datasheet, BFP420H6433XTMA1 pinout, BFP420H6433XTMA1 application, or BFP420H6433XTMA1 equivalent, key selection criteria include noise figure vs. bias current, S-parameter validation up to 6 GHz, thermal resistance (RthJS = 250 K/W), and SOT343 package compatibility with RF layout constraints.

Technical Context

This NPN RF transistor operates in common-emitter configuration with emitter-grounded AC paths and base bias control. Its Gummel-Poon SPICE model includes extracted package parasitics and supports DC + RF simulation up to 10 GHz, validated against measured S-parameters and noise parameters including ZSopt and RN.

The device delivers stable gain across 0.9–6 GHz with peak Gms at 1.8 GHz under 20 mA/2 V bias, while maintaining IP3 = 22 dBm and P-1dB = 12 dBm - critical for wideband receiver linearity in multi-carrier LTE and Wi-Fi systems.

Key Specifications

Pinout & Package

SOT343 (4-pin plastic leadless package) with visible leads, RoHS/halogen-free compliant, footprint compatible with JEDEC MO-229 standard.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-noise RF transistor applications.

Compared with BFP420H6433XTMA1, BFP640FESD offers superior high-frequency gain and noise but tighter bias control; MMD25200 trades performance for cost and qualification flexibility, making it viable only in non-automotive, thermally unconstrained designs.

Availability

BFP420H6433XTMA1 is available at Aetrix Electronics and suitable for GPS receivers, cellular UE front-ends, and ISM-band transceivers requiring stable component supply, AEC-Q101 compliance, and traceable RoHS/halogen-free sourcing.

Supply support for BFP420H6433XTMA1 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 BFP420 belongs to Infineon's BFP family of silicon bipolar RF transistors designed specifically for high-performance, low-noise amplification in sub-6 GHz wireless infrastructure and mobile terminals.

FAQ

What is the recommended DC bias for minimum noise figure?

The BFP420H6433XTMA1 achieves NFmin = 1.1 dB at IC = 5 mA and VCE = 2 V. This bias point is validated in the datasheet and corresponds to ZSopt = 50 + j25 Ω at 1.8 GHz. Operating at 20 mA increases gain but raises NF to ~1.4 dB - use 5 mA for noise-critical GNSS front-ends.

Does this part require external matching networks?

Yes - the BFP420H6433XTMA1 is not internally matched. Its S-parameters and ZSopt values (e.g., 50 + j25 Ω at 1.8 GHz) require discrete LC or microstrip matching networks on PCB to achieve NFmin or Gms. The SPICE model includes package parasitics to aid accurate simulation of these networks.

Is the SOT343 package suitable for reflow soldering?

Yes - the SOT343 package is qualified for lead-free reflow per JEDEC J-STD-020. Peak temperature must not exceed 260 °C for ≤30 seconds. Thermal profile must respect RthJS = 250 K/W: board layout should maximize copper area under pin 2 and 4 (emitter) to maintain junction temperature ≤150 °C at 210 mW.

Where can I obtain the verified S-parameter and noise parameter files?

Infineon provides S-parameter (.s2p) and noise parameter (.np) files for the BFP420H6433XTMA1 on its official RF models portal (www.infineon.com/rf.models). Files are updated quarterly and include full frequency sweeps (0.1–10 GHz), bias-dependent data, and ZSopt/RN tables - no registration required for download.