Infineon Technologies BFP420H6327XTSA1

Overview

BFP420H6327XTSA1 from Infineon Technologies is a low-noise silicon bipolar RF transistor in SOT343 package, designed for high-gain, low-noise amplifier stages at 1.8 GHz. It delivers NFmin = 1.1 dB, Gms = 21 dB, fT = 25 GHz, and supports oscillators up to 10 GHz in mobile front-end and GPS receiver LNA applications.

For engineers reviewing the BFP420H6327XTSA1 datasheet, BFP420H6327XTSA1 pinout, BFP420H6327XTSA1 application, or BFP420H6327XTSA1 equivalent, key selection criteria include verified noise figure at 1.8 GHz, stable power gain under 50 Ω terminations, thermal resistance RthJS = 250 K/W, and AEC-Q101 qualification for automotive-grade reliability.

Technical Context

This NPN RF transistor operates with VCE = 2–4 V and IC = 5–20 mA bias points optimized for minimum noise and maximum stable gain. Its fT of 25 GHz and Ccb = 0.15 pF (typ.) enable broadband amplification from 0.9 to 6 GHz while maintaining low intermodulation distortion (IP3 = 22 dBm).

The device uses a monolithic silicon epitaxial structure with visible-lead SOT343 packaging, supporting DC-coupled RF matching networks. Its ZSopt impedance varies with frequency (e.g., 10 + j100 Ω at 1.8 GHz), requiring precise source termination for NFmin achievement.

Key Specifications

Pinout & Package

SOT343 plastic surface-mount package with visible leads, 4-pin configuration, lead-free and halogen-free per RoHS.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BFP640FESD and MRF581, the BFP420H6327XTSA1 uniquely balances 1.1 dB NFmin, 21 dB Gms, AEC-Q101 compliance, and dual-emitter thermal design-making it optimal for automotive GNSS and industrial wireless infrastructure where reliability and noise performance are jointly critical.

Availability

BFP420H6327XTSA1 is available at Aetrix Electronics and suitable for GPS/GNSS receivers, automotive telematics modules, and ISM-band wireless transceivers requiring stable component supply across production lifecycles.

Supply support for BFP420H6327XTSA1 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.

The BFP420 belongs to Infineon's high-frequency bipolar transistor product line, engineered specifically for low-noise, high-gain RF amplification and oscillator circuits in 0.9–6 GHz wireless systems.

FAQ

What is the recommended DC bias for achieving NFmin = 1.1 dB?

IC = 5 mA and VCE = 2 V is the validated bias condition for minimum noise figure at 1.8 GHz. This point is confirmed in the datasheet's Electrical Characteristics table and supported by ZSopt impedance curves across frequency. Deviation beyond ±10% IC or ±0.2 V VCE increases NF by ≥0.2 dB.

Does BFP420H6327XTSA1 require external matching for 50 Ω systems?

Yes - the device does not have 50 Ω input/output impedance. Its ZSopt at 1.8 GHz is 10 + j100 Ω, requiring an external L/C matching network to transform 50 Ω to this complex impedance for NFmin. The |S21|² measurement at 50 Ω shows 14–17 dB gain but with higher noise figure.

Is the SOT343 package thermally adequate for continuous 210 mW operation?

No - Ptot = 210 mW is the absolute maximum at TS ≤ 98 °C. In practice, sustained operation above 120 mW requires aggressive copper pour and thermal vias beneath pin 2 and pin 4 (emitters). Derating curves show Ptot drops to 150 mW at TS = 110 °C.

Can BFP420H6327XTSA1 be used in Class-C oscillator designs?

Yes - its fT = 25 GHz and low Ccb support stable oscillation up to 10 GHz in Colpitts and Clapp topologies. Application Note AN201 (Infineon) confirms successful 2.4 GHz Bluetooth oscillator implementation using this part with <1° RMS phase jitter at 10 kHz offset.