Infineon Technologies BFP740E6327

Overview

BFP740E6327 from Infineon Technologies is a silicon germanium (SiGe:C) NPN bipolar RF transistor optimized as a low-noise amplifier (LNA) for 0.45–5.5 GHz applications, featuring NFmin = 0.85 dB at 5.5 GHz, OIP3 = 24.5 dBm at 5.5 GHz, and fT = 44 GHz at 3 V/25 mA. It operates with VCEO = 4.0 V, IC(max) = 45 mA, and is widely deployed in WLAN 802.11ac and GPS front-end modules.

For engineers reviewing the BFP740E6327 datasheet, BFP740E6327 pinout, BFP740E6327 application, or BFP740E6327 equivalent, key selection criteria include noise figure at 5.5 GHz, third-order intercept performance under 15 mA bias, SOT343 package thermal resistance, and SiGe:C process linearity at low collector current.

Technical Context

The BFP740E6327 employs a heterojunction bipolar transistor architecture with carbon-doped SiGe base, enabling high fT and low 1/f noise. Its DC bias stability supports operation from IC = 6 mA to 45 mA, with VCE adjustable from 1.5 V to 4.0 V while maintaining sub-1 dB NFmin across 2–6 GHz bands.

It delivers broadband small-signal gain (Gms = 19.5 dB @ 5.5 GHz) and input/output impedance characteristics suitable for 50 Ω matching without external feedback. The device's CCB = 0.17 pF @ VCB = 2 V enables stable wideband amplification up to 11 GHz in cascaded LNA stages.

Key Specifications

Pinout & Package

Supplied in SOT343 (SC-70) plastic surface-mount package with visible leads and RoHS/halogen-free compliance. Thermal resistance RthJA = 220 K/W enables operation up to +85 °C ambient in compact RF modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BFP740E6327, BFP640FESD offers better noise and gain but lacks automotive qualification, while MMA040407-12 trades 0.1 dB NF and 2.4 dBm OIP3 for GaAs cost structure and higher gate leakage current.

Availability

BFP740E6327 is available at Aetrix Electronics and suitable for WLAN 802.11ac access points, GPS/GLONASS navigation modules, and ISM-band Zigbee transceivers requiring stable component supply across multi-year production cycles.

Supply support for BFP740E6327 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, RF, automotive, and security ICs, with global manufacturing and R&D centers.

The BFP740 belongs to Infineon's SiGe:C RF transistor product line, engineered specifically for high-linearity, ultra-low-noise amplification in sub-6 GHz wireless infrastructure and mobile front-end applications.

FAQ

What is the recommended DC bias for optimal noise figure at 5.5 GHz?

The datasheet specifies NFmin = 0.85 dB at 5.5 GHz with VCE = 3 V and IC = 6 mA. This bias point uses the dual-emitter configuration for lowest effective emitter inductance and requires source impedance matching to Zopt = 32 + j14 Ω per Figure 5-16.

Does BFP740E6327 require external ESD protection in PCB layout?

Yes - the device is ESD-sensitive (HBM Class 1B, 250 V), and the datasheet mandates use of grounded wrist straps, conductive foam, and ionized air during handling. No internal ESD diodes are integrated; external TVS or RC filters on base/collector lines are recommended for field-reliable designs.

Can BFP740E6327 operate reliably at 85 °C ambient temperature?

Yes - with RthJA = 220 K/W and Ptot = 250 mW maximum, junction temperature remains below 150 °C at IC = 15 mA, VCE = 3 V, and TA = 85 °C, satisfying industrial temperature grade requirements per Infineon's qualification report.

Is the SOT343 footprint compatible with standard reflow profiles?

Yes - the Pb-free, halogen-free SOT343 package is qualified for IPC/JEDEC J-STD-020D moisture sensitivity level 1 and supports peak reflow temperatures up to 260 °C for 30 seconds, matching standard lead-free assembly processes.