Infineon Technologies BF998RE6327HTSA1

Overview

BF998RE6327HTSA1 from Infineon Technologies is a silicon N-channel dual-gate MOSFET tetrode optimized for low-noise, gain-controlled RF amplification up to 800 MHz. It features two independent gates (G1/G2), 9 mA typical IDSS, 24 mS typical forward transconductance (gfs), and 1.8 dB noise figure at 800 MHz - deployed in VHF/UHF receiver front-ends and automotive radar LNA stages.

For engineers reviewing the BF998RE6327HTSA1 datasheet, BF998RE6327HTSA1 pinout, BF998RE6327HTSA1 application, or BF998RE6327HTSA1 equivalent, key selection criteria include dual-gate bias flexibility, sub-2 dB NF at 800 MHz, gain control range of 40–50 dB, thermal resistance ≤370 K/W, and AEC-Q101 qualification for automotive RF modules.

Technical Context

This tetrode structure isolates gate 1 (signal input) from gate 2 (gain control), enabling independent DC biasing and dynamic gain adjustment without signal path disruption. Its short-channel design delivers high S/C quality factor and low feedback capacitance (25 fF), critical for stable broadband amplification.

The device operates with VG2S adjustable from −2 V to +4 V to modulate power gain over 40–50 dB while maintaining 1.8 dB noise figure at 800 MHz and 2.8 dB at 45 MHz - supporting adaptive sensitivity in AM/FM tuners and digital TV front-ends.

Key Specifications

Pinout & Package

SOT143 package: 4-pin surface-mount plastic package with gull-wing leads, 1.3 mm × 1.7 mm footprint, 0.95 mm height, and RoHS-compliant lead finish.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-gate MOSFET amplifier applications.

Compared with BF998RE6327HTSA1, BFP181 offers higher transconductance and lower input capacitance for improved high-frequency matching, while BF994 trades 5 dB of gain control range for 0.3 dB NF reduction - making BF998 the balanced choice for cost-sensitive automotive tuners requiring both noise and AGC performance.

Availability

BF998RE6327HTSA1 is available at Aetrix Electronics and suitable for automotive infotainment systems, broadcast receiver designs, and industrial RF sensor interfaces requiring stable component supply and AEC-Q101 compliance.

Supply support for BF998RE6327HTSA1 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 ICs, with leadership in high-reliability discrete devices and embedded security solutions.

BF998 belongs to Infineon's RF bipolar and MOSFET portfolio, designed specifically for low-noise, gain-controllable amplification in automotive and consumer broadcast front-ends up to 1 GHz.

FAQ

What is the recommended gate bias configuration for minimum noise figure?

For minimum noise figure at 800 MHz, bias G1 at 0 V and G2 at +4 V with VDS = 8 V and ID ≈ 10 mA. This configuration yields 1.8 dB NF and 24 mS gfs per datasheet Figure 5. Avoid negative G2 bias in low-noise mode, as it increases F by up to 1.2 dB due to reduced channel conductivity.

Can BF998RE6327HTSA1 be used in a common-source amplifier without gain control?

Yes - tie G2 to +4 V (or VDD) and use G1 as the sole RF input. This fixes transconductance and eliminates gain variation, delivering stable 28 dB power gain at 45 MHz and 20 dB at 800 MHz. The device remains fully functional as a single-gate MOSFET with no performance penalty.

Is thermal derating required above 76 °C case temperature?

Yes - total power dissipation must be linearly derated above TS = 76 °C per the curve on page 4 of the datasheet. At TS = 100 °C, Ptot drops to ~120 mW; at TS = 120 °C, it falls to ~60 mW. PCB copper area and solder joint thermal path directly impact achievable TS in real assemblies.

Does the SOT143 package support reflow soldering per J-STD-020?

Yes - BF998RE6327HTSA1's SOT143 package is qualified for standard Pb-free reflow profiles (peak 260 °C, 20–40 sec above 217 °C). The moisture sensitivity level is MSL 1, allowing unlimited floor life at ≤30 °C/60% RH without dry packing.