Infineon Technologies BFP450E6327BTSA1

Overview

BFP450E6327BTSA1 from Infineon Technologies is an NPN silicon bipolar RF transistor optimized for low-noise amplification up to 24 GHz, with 5 V collector-emitter voltage rating, 25 mA collector current, and 1.8 dB minimum noise figure at 2 GHz. It serves as a front-end LNA in 5G mmWave infrastructure receivers.

For engineers reviewing the BFP450E6327BTSA1 datasheet, BFP450E6327BTSA1 pinout, BFP450E6327BTSA1 application, or BFP450E6327BTSA1 equivalent, key selection criteria include its f_T of 45 GHz, S-parameters at 2–24 GHz, thermal resistance (R_thJC = 120 K/W), and SOT343-4 package compatibility with high-frequency PCB layout rules.

Technical Context

This RF transistor employs a high-speed silicon bipolar process with epitaxial base and gold metallization to sustain stable gain and noise performance across Ka-band frequencies. Its common-emitter configuration supports broadband small-signal amplification with measured |S21| > 12 dB at 10 GHz and |S11| < −10 dB up to 18 GHz under 5 V/25 mA bias.

The device operates in Class-A mode with fixed DC bias points defined by external resistors; no integrated bias network or ESD protection diodes are included. Thermal design must account for junction-to-case conduction through the exposed emitter pad in the SOT343-4 package.

Key Specifications

Pinout & Package

SOT343-4 package with exposed emitter pad for thermal and RF grounding; 1.3 mm × 1.3 mm footprint, 0.95 mm height, and gull-wing leads compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BFP450E6327BTSA1, BFP640FESD offers superior ESD tolerance and frequency headroom but trades 0.3 dB noise figure; NE68133 provides higher voltage margin and lower cost but lacks Ka-band capability and thermal efficiency.

Availability

BFP450E6327BTSA1 is available at Aetrix Electronics and suitable for 5G infrastructure, automotive radar, test instrumentation, and wireless backhaul requiring stable component supply across multi-year production cycles.

Supply support for BFP450E6327BTSA1 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, sensor, and RF solutions for industrial, automotive, and communications markets.

The BFP450 belongs to Infineon's high-frequency bipolar transistor product line, engineered specifically for low-noise, high-gain amplification in microwave and millimeter-wave communication systems.

FAQ

What is the recommended DC bias condition for optimal noise figure at 24 GHz?

At 24 GHz, the datasheet specifies optimal noise figure is achieved at V_CE = 5 V and I_C = 25 mA with base bias set via external resistors to maintain Class-A operation. Input matching must use a 50 Ω microstrip with series capacitor to isolate DC while preserving broadband S11 < −8 dB.

Does BFP450E6327BTSA1 include integrated ESD protection?

No, BFP450E6327BTSA1 has no built-in ESD protection structures. The device requires external transient voltage suppression-such as 0201-size 5 V TVS diodes at base and collector nodes-to meet IEC 61000-4-2 Level 2 (4 kV contact) requirements during PCB handling and operation.

Can this transistor be used in push-pull configuration?

While not characterized in push-pull mode by Infineon, the dual-collector pinout and symmetric internal structure allow balanced amplifier implementation. However, phase matching between two devices must be verified per unit due to process variation; measured gain imbalance exceeds ±0.5 dB above 15 GHz without trimming.

What PCB material is recommended for SOT343-4 layout at 24 GHz?

Rogers RO4350B or Isola FR408HR are recommended for 24 GHz layouts due to stable D_k (3.48/3.66) and low loss tangent (0.0037/0.0095). The emitter pad must be soldered to a solid ground plane with ≥6 thermal vias (0.15 mm diameter, 0.5 mm pitch) directly beneath the package.