Infineon Technologies BFP640FH6327XTSA1

Overview

BFP640FH6327XTSA1 from Infineon is a silicon NPN RF bipolar transistor in SOT343 package, designed for low-noise amplification at 1.8 GHz with NFmin = 0.9 dB (2 V, 5 mA), Gms = 21.5 dB (2 V, 20 mA), OIP3 = 24.5 dBm (2 V, 20 mA), and 1 kV HBM ESD robustness. It serves as the active gain element in broadband LNA stages for terrestrial and broadcast receivers.

For engineers reviewing the BFP640FH6327XTSA1 datasheet, BFP640FH6327XTSA1 pinout, BFP640FH6327XTSA1 application, or BFP640FH6327XTSA1 equivalent, key selection criteria include noise figure vs. bias current trade-off, 50 Ω input/output matching capability, ESD tolerance for production handling, and SOT343 thermal resistance (RthJS = 290 K/W) in compact RF layouts.

Technical Context

This grounded-emitter (SIEGET™) RF transistor operates in common-emitter configuration with DC bias applied to base and collector, emitter tied to RF ground. Its fT = 21–30 GHz enables stable gain up to 3 GHz, while CCB = 0.14–0.24 pF and CEB = 0.59 pF support broadband 50 Ω matching without external neutralization.

The device uses epitaxial base technology optimized for low 1/f noise and high transconductance. Its ESD protection structure integrates on-chip diodes between base-emitter and base-collector junctions, delivering 1 kV HBM rating without degrading RF performance or requiring external clamping.

Key Specifications

Pinout & Package

SOT343 plastic surface-mount package with 4 terminals, 1.3 mm × 1.3 mm footprint, 0.95 mm height, and gull-wing leads. Thermal pad not present; heat dissipation relies on leadframe conduction through emitter pins.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BFP520H6327XTSA1 and MMA040707-12, BFP640FH6327XTSA1 offers the lowest noise figure at standard 2 V bias, making it optimal for consumer broadcast receivers where sensitivity is prioritized over voltage headroom or ultra-low current operation.

Availability

BFP640FH6327XTSA1 is available at Aetrix Electronics and suitable for satellite LNB modules, CATV distribution amplifiers, DAB/DMB portable radios, and FM/AM tuner front-ends requiring stable component supply and JEDEC-qualified reliability.

Supply support for BFP640FH6327XTSA1 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 AG is a German semiconductor manufacturer specializing in power management, automotive, industrial, and RF solutions, with global R&D and manufacturing infrastructure.

The BFP640FH6327XTSA1 belongs to Infineon's fifth-generation SIEGET™ RF bipolar transistor family, engineered specifically for cost-sensitive, high-volume broadcast and wireless receiver front-ends demanding low noise and production-ready ESD robustness.

FAQ

What is the recommended DC bias condition for minimum noise figure?

The datasheet specifies NFmin = 0.9 dB at VCE = 2 V, IC = 5 mA. This requires setting base bias to achieve 5 mA collector current while maintaining 2 V across collector-emitter. A typical configuration uses a 10 kΩ base resistor with 2 V supply and emitter degeneration resistor to stabilize operating point against process variation.

Can BFP640FH6327XTSA1 be used in 5 V supply applications?

No - absolute maximum VCEO is 4.5 V with open base. Operating above this risks permanent breakdown. For 5 V systems, use alternatives like MMA040707-12 (VCEO = 12 V) or add a series dropper resistor to limit VCE, though this degrades gain and noise performance.

How does the dual-emitter configuration improve RF performance?

The two emitter pins (Pins 2 and 4) provide parallel low-inductance paths to ground, reducing emitter lead inductance by ~40% versus single-emitter SOT343 devices. This improves stability at UHF frequencies and lowers effective noise resistance without requiring external emitter bypass capacitors.

Is this device qualified for automotive applications?

Yes - it is qualified per AEC-Q101 for stress testing including HTSL, TC, and ESD. However, it is not automotive-grade screened (e.g., no PPAP documentation or zero-defect sampling). Use in automotive infotainment front-ends requires additional system-level validation per ISO 16750.