Infineon Technologies BFR340L3E6327XTMA1

Overview

BFP540ESD 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, Gms = 21.5 dB, and OIP3 = 24.5 dBm under 2 V / 20 mA bias; used in LNB local oscillators and CATV/DVB-T broadband LNAs.

For engineers reviewing the BFP540ESD datasheet, BFP540ESD pinout, BFP540ESD application, or BFP540ESD equivalent, key selection criteria include ESD robustness (1 kV HBM), grounded-emitter SIEGET™ architecture, fT = 21–30 GHz, thermal resistance RthJS = 290 K/W, and SOT343 pin configuration (B-E-C-E).

Technical Context

This RF transistor employs Infineon's fifth-generation SIEGET™ (Silicon Germanium Grounded Emitter Transistor) structure, enabling high gain and low noise via optimized emitter grounding and epitaxial base design. Its ESD protection integrates monolithic diode structures across all terminals without external components.

It operates in grounded-emitter configuration with DC bias conditions defined for 1.8 GHz performance: VCE = 2 V, IC = 5–20 mA, and matching to 50 Ω systems using Bias-T test fixtures. Noise and linearity are characterized with fixture-loss correction applied to NFmin and OIP3 values.

Key Specifications

Pinout & Package

SOT343 surface-mount plastic package with 4-terminal lead frame, optimized for RF matching and thermal dissipation on FR4 PCBs. Pin 1 = Base (B), Pin 2 = Emitter (E), Pin 3 = Collector (C), Pin 4 = Emitter (E) - dual-emitter configuration improves grounding and reduces parasitic inductance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BFP540ESD, BFR340L3E6327XTMA1 trades 9 GHz fT and 0.4 dB NF for lower unit cost and retained ESD robustness, while BFP420 offers superior RF specs at the expense of system-level protection integration.

Availability

BFP540ESD is available at Aetrix Electronics and suitable for LNB modules, CATV amplifiers, DVB-T tuners, and cordless phone RF stages requiring stable component supply, industrial temperature range support, and AEC-Q101 qualification.

Supply support for BFP540ESD 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, and automotive ICs, with global manufacturing and quality certification to ISO/TS 16949 and IATF 16949.

The BFP540ESD belongs to Infineon's fifth-generation RF bipolar transistor family, engineered specifically for cost-sensitive, high-volume consumer and industrial RF front-ends demanding integrated ESD protection and SIEGET™-enabled performance.

FAQ

What is the recommended DC bias for minimum noise figure?

For minimum noise figure (NFmin = 0.9 dB), bias the BFP540ESD at VCE = 2 V and IC = 5 mA with grounded-emitter configuration. This condition is validated per datasheet Table 6 and requires precise current-setting via emitter resistor or active bias circuit to maintain stability across temperature.

Can BFP540ESD replace BFR340L3E6327XTMA1 in existing designs?

Yes, BFP540ESD is pin-compatible with BFR340L3E6327XTMA1 in SOT343 and shares identical pinout (B-E-C-E), but requires re-optimization of matching networks due to higher fT (21–30 GHz vs. 12 GHz) and lower NFmin. Bias point adjustment may improve noise performance without layout change.

Is external ESD protection required despite the integrated structure?

No external ESD protection is required for standard handling and board-level operation, as the monolithic 1 kV HBM protection covers typical assembly and field stress. However, direct contact with charged cables or connectors in unshielded environments may still warrant supplemental TVS in system-level design reviews.

What thermal derating applies above 77 °C soldering point temperature?

Total power dissipation must be linearly derated above TS = 77 °C using RthJS = 290 K/W: Ptot = 250 mW × (1 − (TS − 77)/73). At TS = 100 °C, maximum continuous power drops to ~190 mW; pulsed operation follows Figure 3 derating curves based on duty cycle and pulse width.