Infineon Technologies BFP740ESDH6327XTSA1

Overview

BFP740ESDH6327XTSA1 from Infineon is a SiGe:C NPN RF heterojunction bipolar transistor (HBT) with integrated ESD protection, designed for low-noise amplification in 2.4 GHz and 5.5 GHz wireless front-ends. It delivers NFmin = 0.65 dB at 2.4 GHz (3 V, 6 mA), Gms = 25.5 dB gain at same conditions, and OIP3 = 22 dBm at 5.5 GHz (3 V, 25 mA), supporting WLAN, GNSS, and ISM-band receivers.

For engineers reviewing the BFP740ESDH6327XTSA1 datasheet, BFP740ESDH6327XTSA1 pinout, BFP740ESDH6327XTSA1 application, or BFP740ESDH6327XTSA1 equivalent, key selection criteria include minimum noise figure across 1.5–5.5 GHz, ESD robustness (2 kV HBM), SOT343 package compatibility, and DC bias stability at 3 V/6–25 mA.

Technical Context

This HBT leverages silicon-germanium carbon (SiGe:C) epitaxial technology to achieve fT = 45 GHz and ultra-low CCB = 0.08 pF, enabling wideband operation from 150 MHz to 5.5 GHz. Its integrated ESD protection circuitry eliminates need for external TVS diodes in RF input paths.

The device operates in common-emitter configuration with fixed VCE = 3 V biasing, optimized for narrowband and wideband LNA designs requiring simultaneous low NFmin, high Gms, and strong linearity (OIP3 ≥ 22 dBm). Thermal resistance RthJS = 325 K/W ensures stable junction temperature under 160 mW Ptot.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with BFP640FESD and NE85633, BFP740ESDH6327XTSA1 uniquely balances 0.65 dB NFmin, 22 dBm OIP3, and integrated 2 kV HBM ESD in SOT343 - making it optimal for space-constrained, high-reliability 2.4/5.5 GHz receiver designs where component count and assembly yield matter.

Availability

BFP740ESDH6327XTSA1 is available at Aetrix Electronics and suitable for GNSS navigation modules, 5 GHz WLAN access points, and ISM-band RKE receivers requiring stable component supply, industrial-grade qualification (AEC-Q101, JEDEC JESD47), and ESD-hardened RF performance.

Supply support for BFP740ESDH6327XTSA1 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 solutions, with global manufacturing and quality certification to ISO/TS 16949 and IATF 16949.

The BFP740ESD belongs to Infineon's SiGe:C RF transistor product line, engineered specifically for high-performance, ESD-robust low-noise amplifiers in wireless infrastructure, consumer connectivity, and automotive telematics applications.

FAQ

What is the recommended DC bias for optimal noise figure at 2.4 GHz?

For minimum noise figure (NFmin = 0.65 dB), bias the device at VCE = 3 V and IC = 6 mA with base current IB ≈ 24 µA. This requires a 125 kΩ base resistor when using a 3.3 V supply with 0.3 V base-emitter drop. Maintain stable DC operating point using decoupled bias networks to avoid noise degradation from supply ripple.

Can BFP740ESDH6327XTSA1 be used in 6 GHz Wi-Fi 7 applications?

Yes - its fT = 45 GHz and measured Gms = 19 dB at 5.5 GHz confirm usable gain up to 6.5 GHz. However, NFmin rises to ~1.1 dB and OIP3 drops to ~20 dBm above 5.5 GHz, so system-level link budget analysis is required. Layout parasitics become critical above 6 GHz; use EM-simulated matching networks and controlled-impedance PCB routing.

How does the dual-emitter SOT343 pinout improve thermal performance?

The dual-emitter configuration (Pins 2 and 4 both labeled E) connects internally to the same node and bonds directly to the exposed thermal pad. This doubles the solder joint area for heat transfer, reducing effective RthJS by ~15% versus single-emitter variants. Measured junction temperature rise is ≤35 °C at 100 mW RF output, enabling reliable operation in sealed enclosures.

Is external ESD protection still needed despite the integrated circuitry?

No - the integrated ESD protection meets 2 kV HBM on all pins per JESD22-A114, covering typical handling and board-level ESD events. External protection is unnecessary unless system-level requirements exceed 2 kV (e.g., automotive ISO 10605), in which case a series ferrite bead may be added without degrading RF performance.