Infineon Technologies BFP640H6327XTSA1

Overview

BFP640H6327XTSA1 from Infineon is a silicon-germanium carbon (SiGe:C) NPN RF bipolar transistor optimized for low-noise, high-linearity amplification up to 8 GHz. It delivers NFmin = 0.65 dB at 1.9 GHz (3 V, 6 mA), OIP3 = 26.5 dBm at 1.9 GHz (3 V, 25 mA), and fT = 42 GHz, making it ideal for GNSS and satellite radio LNA stages where power efficiency and signal fidelity are critical.

For engineers reviewing the BFP640H6327XTSA1 datasheet, BFP640H6327XTSA1 pinout, BFP640H6327XTSA1 application, or BFP640H6327XTSA1 equivalent, key selection criteria include noise figure vs. bias current trade-offs, SOT343 thermal resistance (RthJS = 300 K/W), OIP3 stability across 0.45–5.5 GHz, and JEDEC-qualified industrial reliability.

Technical Context

This SiGe:C transistor operates in common-emitter configuration with DC current gain hFE = 110–270 (VCE = 3 V, IC = 30 mA). Its high fT (42 GHz) and low CCB (0.08 pF) enable stable small-signal gain up to 5.5 GHz while maintaining sub-1 dB NFmin across 0.45–3.5 GHz at low collector currents.

The device uses a symmetric dual-emitter SOT343 package (Pin 1 = B, Pin 2 = E, Pin 3 = C, Pin 4 = E), supporting matched layout for balanced input matching and thermal symmetry. Bias-T test setup per Figure 2 confirms ZS = ZL = 50 Ω operation with calibrated fixture loss compensation for NFmin and OIP3.

Key Specifications

Pinout & Package

Package: SOT343 - surface-mount plastic package with four terminals, 1.3 mm × 1.3 mm footprint, 0.95 mm height, and exposed emitter pad for thermal conduction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BFP640H6327XTSA1, BFP640FESDXTSA1 adds ESD robustness at minor noise penalty, while NE68133 trades linearity and cost for GaAs-specific ruggedness - neither matches the 0.65 dB/26.5 dBm performance-per-dollar ratio of the base BFP640.

Availability

BFP640H6327XTSA1 is available at Aetrix Electronics and suitable for GNSS receivers, satellite radio tuners, and CATV infrastructure requiring stable component supply, JEDEC-qualified reliability, and consistent SiGe:C process lot traceability.

Supply support for BFP640H6327XTSA1 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 ICs, and RF components, with global manufacturing and R&D centers.

The BFP640 belongs to Infineon's sixth-generation SiGe:C RF transistor family, engineered specifically for ultra-low-noise, high-linearity amplification in battery-constrained wireless receivers.

FAQ

What is the recommended bias network for optimal NFmin at 1.9 GHz?

Use a 50 Ω series base feed with 100 nF bypass capacitor to ground at Pin 1 (B), 3 V DC supply through 100 Ω resistor to Pin 3 (C), and direct connection of Pins 2 and 4 (E) to a 20 mm² internal ground plane. Matching network must compensate for CEB = 0.51 pF and CCB = 0.08 pF per datasheet Figure 2.

Can BFP640H6327XTSA1 operate reliably at 8 GHz despite its 42 GHz fT?

Yes - measured Gma remains >12.5 dB at 5.5 GHz and >8 dB at 8 GHz (per extrapolated S-parameter data in Infineon AN2018-05). Thermal derating is required: limit IC to ≤15 mA at TA = 85 °C to maintain TJ < 125 °C given RthJS = 300 K/W.

Is the SOT343 package lead-free and RoHS-compliant?

Yes - BFP640H6327XTSA1 uses lead-free matte tin plating per JEDEC J-STD-020 Rev. E, with peak reflow temperature rating of 260 °C (20 sec max). The SOT343 body meets RoHS Directive 2011/65/EU and REACH SVHC thresholds.

How does OIP3 vary with supply voltage between 2.5 V and 3.5 V?

OIP3 increases by +0.8 dBm per 0.1 V from 2.5 V to 3.0 V (measured at 1.9 GHz, IC = 25 mA), then saturates at 26.5 dBm from 3.0–3.5 V. Below 2.7 V, gain drops >1.2 dB and NFmin degrades >0.15 dB - 3.0 V is the optimal bias point.