Infineon Technologies BFG 19S E6327

Overview

BFG19S E6327 from Infineon Technologies is an NPN silicon RF transistor optimized for low-noise, low-distortion broadband amplification in antenna and telecommunication systems up to 1.5 GHz; features f_T = 4–5.5 GHz, noise figure ≤ 2 dB at 900 MHz, G_ma = 14 dB at 900 MHz, V_CEO = 15 V, and SOT223 package with emitter-collector-emitter-base pinout.

For engineers reviewing the BFG19S E6327 datasheet, BFG19S E6327 pinout, BFG19S E6327 application, or BFG19S E6327 equivalent, key selection criteria include its 900 MHz/1.8 GHz noise performance, 32 dBm OIP3 linearity, 70–140 h_FE DC gain range, thermal resistance R_thJS ≤ 75 K/W, and RoHS-compliant SOT223 footprint compatibility with high-reliability RF front-end designs.

Technical Context

This RF transistor employs a planar epitaxial silicon structure with optimized doping profiles to achieve high f_T and low C_cb (0.8–1.1 pF) and C_eb (4.1 pF), enabling stable broadband gain up to 1.5 GHz under 10–70 mA collector bias conditions.

Its low-noise design targets Z_Sopt-matched input impedance at 900 MHz and 1.8 GHz, delivering F ≤ 2 dB and G_ma ≥ 14 dB while maintaining I_CES ≤ 100 µA and h_FE = 70–140 at V_CE = 8 V, supporting Class-A linear amplifier stages in cellular infrastructure and wireless receiver front-ends.

Key Specifications

Pinout & Package

Package: SOT223 - surface-mount plastic package with exposed collector tab for thermal conduction and mechanical anchoring; 4-pin configuration with dual emitter leads for low-inductance emitter degeneration.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BFG19S E6327, BFP180W offers higher frequency capability but reduced voltage headroom and thermal robustness, while MRF581 provides identical voltage rating but inferior linearity and outdated packaging-making BFG19S E6327 optimal for new 900 MHz/1.8 GHz telecom designs requiring balanced noise, linearity, and manufacturability.

Availability

BFG19S E6327 is available at Aetrix Electronics and suitable for GSM base station LNAs, UMTS receiver front-ends, and ISM band transceiver driver stages requiring stable component supply, consistent parametric yield, and RoHS-compliant manufacturing traceability.

Supply support for BFG19S E6327 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 ICs, and RF components, with global R&D and wafer fabrication facilities.

The BFG19S belongs to Infineon's legacy RF bipolar transistor product line, engineered specifically for high-yield, low-noise amplification in cellular infrastructure and wireless communication equipment operating below 2 GHz.

FAQ

What is the recommended bias condition for minimum noise figure at 900 MHz?

The datasheet specifies F ≤ 2 dB at I_C = 20 mA and V_CE = 8 V with Z_S = Z_Sopt. This condition requires external input matching to approximately 15 + j10 Ω (typical), achievable via microstrip stub or lumped LC network calibrated on a VNA. Bias stability must be ensured using emitter degeneration resistors to suppress thermal runaway.

Can BFG19S E6327 be used in Class AB amplifier configurations?

Yes - its h_FE range (70–140) and thermal resistance (R_thJS ≤ 75 K/W) support stable Class AB operation at I_CQ = 30–50 mA. However, third-order intermodulation must be verified per application; measured IP3 drops to ~28 dBm at 50 mA, requiring careful load-pull tuning to maintain linearity.

Is the SOT223 package lead-free and compatible with standard reflow profiles?

Yes - BFG19S E6327 is RoHS-compliant with Pb-free terminations. It supports JEDEC J-STD-020D reflow profiles: peak temperature 260°C (≤ 10 sec), ramp-up ≤ 3°C/s, and time above 217°C of 60–150 sec. The exposed collector tab requires full-solder coverage for thermal integrity.

How does the dual-emitter configuration affect circuit layout?

Pins 1 and 3 are internally connected emitters; using both reduces parasitic inductance by ~0.3 nH versus single-emitter routing. Layout best practice is to tie both pins directly to a low-inductance ground plane via separate vias within 2 mm, avoiding daisy-chaining to prevent asymmetry-induced gain imbalance in differential variants.