Infineon Technologies BFP740H6327XTSA1

Overview

BFP740H6327XTSA1 from Infineon is a SiGe:C NPN RF heterojunction bipolar transistor (HBT) optimized for low-noise, high-gain amplification in 0.45–5.5 GHz front-end stages. It delivers NFmin = 0.85 dB at 5.5 GHz/3 V/6 mA, Gms = 19.5 dB at 5.5 GHz/3 V/15 mA, and OIP3 = 24.5 dBm at same bias, targeting GNSS LNA and WLAN receiver modules.

For engineers reviewing the BFP740H6327XTSA1 datasheet, BFP740H6327XTSA1 pinout, BFP740H6327XTSA1 application, or BFP740H6327XTSA1 equivalent, key selection criteria include noise figure vs. frequency trade-offs, SOT343 thermal resistance (RthJS = 310 K/W), ESD sensitivity (Class 1C), and DC bias stability across industrial temperature range (−55 °C to 150 °C).

Technical Context

The BFP740 operates as a single-stage common-emitter RF amplifier with emitter-degenerated biasing, supporting broadband matching from 450 MHz to 5.5 GHz. Its SiGe:C process enables high fT = 44 GHz and low CCB = 0.08 pF, critical for wideband LNA design in multi-standard receivers.

It requires external DC blocking and bias network design per application frequency band, with validated performance under ZS = ZL = 50 Ω conditions using Bias-T test fixtures. The device exhibits monotonic degradation in NFmin (0.45 dB @ 450 MHz → 0.85 dB @ 5.5 GHz) and Gms (31.5 dB → 19.5 dB), enabling predictable gain-noise optimization.

Key Specifications

Pinout & Package

Package: SOT343 (3.0 × 1.5 × 0.9 mm, 4-pin plastic surface-mount package with exposed thermal pad).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BFP640H6327XTSA1 and MMA040407-12, the BFP740H6327XTSA1 uniquely balances sub-1 dB NFmin across 0.45–5.5 GHz while sustaining >24 dBm OIP3 - making it optimal for wideband GNSS/WLAN dual-mode front-ends where both metrics are simultaneously constrained.

Availability

BFP740H6327XTSA1 is available at Aetrix Electronics and suitable for GNSS navigation modules, WLAN 2.4/5 GHz receivers, and satellite radio front-ends requiring stable component supply across industrial temperature ranges and long product lifecycles.

Supply support for BFP740H6327XTSA1 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 manufacturing and R&D centers.

The BFP740 belongs to Infineon's BFP family of SiGe:C RF transistors, designed specifically for high-performance, low-noise, wideband amplification in consumer and industrial wireless infrastructure and navigation systems.

FAQ

What is the recommended DC bias network for BFP740H6327XTSA1 in a 5.5 GHz LNA?

A stable 3 V, 6 mA bias point requires a base voltage divider (e.g., 10 kΩ/4.7 kΩ) with emitter degeneration (22 Ω), bypassed by a 100 nF capacitor. Collector must use a 100 Ω RF choke and DC blocking capacitor (100 pF). Layout must minimize base lead inductance (<0.3 nH) to preserve NFmin.

Does BFP740H6327XTSA1 require external matching networks for 50 Ω operation?

Yes - the device is not internally matched. At 5.5 GHz, optimal 50 Ω input/output matching requires external shunt-stub or L-section networks using chip inductors (0.3–1.2 nH) and capacitors (0.1–0.5 pF), calibrated per PCB stack-up and grounding scheme per Infineon's AN2017-05 application note.

How does ESD sensitivity impact PCB handling and reflow for BFP740H6327XTSA1?

As a Class 1C ESD-sensitive device, it requires grounded wrist straps, ionized air workstations, and anti-static trays during manual handling. Reflow profile must avoid peak temperatures >260 °C for >10 s to prevent junction damage; recommended profile follows IPC-J-STD-020D with ramp rate ≤3 °C/s pre-peak.

Can BFP740H6327XTSA1 replace BFP640H6327XTSA1 in existing designs without layout changes?

No - although both use SOT343 and share pin 1–4 assignments, BFP740 has higher collector capacitance (CCE = 0.35 pF vs. 0.28 pF) and different S-parameter phase response. Matching networks and bias resistors must be re-optimized; simulation with measured S-parameters is required before substitution.