Infineon Technologies BFP420E6327

Overview

BFP420E6327 from Infineon Technologies is an NPN silicon RF transistor optimized for high-gain, low-noise amplifier stages and oscillator circuits up to 10 GHz. It delivers a noise figure of 1.1 dB at 1.8 GHz, maximum stable power gain of 21 dB at 1.8 GHz, and a transition frequency (f_T) of 25 GHz, housed in a Pb-free SOT343 package with gold metallization for reliability in wireless infrastructure and automotive radar front-ends.

For engineers reviewing the BFP420E6327 datasheet, BFP420E6327 pinout, BFP420E6327 application, or BFP420E6327 equivalent, key selection criteria include its 1.1 dB noise figure at 1.8 GHz, 21 dB G_ms, f_T = 25 GHz, SOT343 thermal resistance (R_thJS ≤ 260 K/W), and AEC-Q101 qualification for automotive-grade RF signal chains.

Technical Context

This device operates as a high-frequency NPN bipolar junction transistor with gold-metallized emitter-base-collector interconnects, enabling stable RF performance beyond 5 GHz. Its f_T = 25 GHz and C_cb = 0.15 pF (typ.) support wideband amplification while maintaining low interelectrode capacitance and high transconductance.

The BFP420E6327 is characterized under pulsed DC conditions (IC = 20 mA, V_CE = 2 V) for RF metrics including |S₂₁|² = 17 dB and IP3 = 22 dBm at 1.8 GHz, with Z_Sopt and Z_Lopt terminations defined for minimum noise and maximum gain configurations.

Key Specifications

Pinout & Package

SOT343 is a leadless, thermally enhanced plastic package with four terminals and an exposed collector pad on the bottom side for improved heat transfer. Pin 1 = Base, Pin 2 = Emitter, Pin 3 = Collector, Pin 4 = Emitter (dual-emitter configuration).

Key Features

Applications

Equivalent & Alternatives

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

Compared with NE85633 and BFP640, the BFP420E6327 offers balanced trade-offs between noise, gain, and thermal robustness-ideal for 1.8–6 GHz infrastructure amplifiers where AEC-Q101 compliance and 25 GHz f_T provide sufficient margin without over-spec'ing.

Availability

BFP420E6327 is available at Aetrix Electronics and suitable for 5G base station radios, automotive radar modules, and Wi-Fi 6E front-end designs requiring stable component supply across multi-year production cycles.

Supply support for BFP420E6327 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, sensor, and RF solutions for automotive, industrial, and communications markets.

The BFP420E6327 belongs to Infineon's SIEGET® 25 GHz f_T line-designed specifically for high-linearity, low-noise RF amplification in cellular infrastructure and automotive radar front-ends.

FAQ

What is the recommended bias condition for minimum noise figure?

At TA = 25°C, the BFP420E6327 achieves its specified 1.1 dB noise figure at IC = 5 mA and VCE = 2 V with source impedance ZS = ZSopt (e.g., 50 + j25 Ω at 1.8 GHz). This condition is validated per Infineon's characterization methodology and requires precise impedance matching networks-not standard 50 Ω termination.

Is the SOT343 package lead-free and RoHS compliant?

Yes, the BFP420E6327 is manufactured in a Pb-free (RoHS-compliant) SOT343 package per Infineon's documentation. The "E6327" suffix denotes tape-and-reel packaging with RoHS-compliant finish; no lead-containing variants are standard for this orderable part number.

Can the dual-emitter configuration be used independently?

No-Pins 2 and 4 are internally shorted as a single emitter node. The dual-terminal layout serves mechanical symmetry and thermal balance, not functional separation. Using them as independent emitters would violate internal construction and invalidate all published RF parameters.

Does Infineon provide S-parameter files for this transistor?

Yes, Infineon publishes verified S-parameter datasets (including noise parameters) for the BFP420E6327 up to 10 GHz on www.infineon.com/rf.models. These files are generated from typical devices and intended for linear and nonlinear simulation-no additional license or registration is required for download.