Infineon Technologies BFR 181T E6327

Overview

BFR181T E6327 from Infineon Technologies is an NPN silicon RF transistor optimized for low-noise, high-gain broadband amplification in 900 MHz and 1.8 GHz cellular front-ends. It delivers 1.45 dB noise figure at 900 MHz, 8 GHz transition frequency (f_T), 19.5 dB maximum stable power gain at 900 MHz, and operates with 5–12 mA collector current under 8 V V_CE. It is used in GSM/EDGE receiver LNA stages where compact size and thermal efficiency are critical.

For engineers reviewing the BFR181T E6327 datasheet, BFR181T E6327 pinout, BFR181T E6327 application, or BFR181T E6327 equivalent, key selection criteria include verified noise performance at 900 MHz, SC75 package thermal resistance (R_thJS = 405 K/W), f_T-based bandwidth margin, and C_cb/C_eb capacitance values for impedance matching in 50 Ω RF designs.

Technical Context

This device employs a planar epitaxial silicon structure with gold-metallized emitter and base contacts to minimize parasitic inductance and optimize high-frequency stability. Its Gummel-Poon SPICE model includes validated parameters such as TF = 17.028 ps, C_cb = 0.26 pF (typ), and C_eb = 0.3 pF (typ), enabling accurate small-signal simulation up to 6 GHz.

The transistor exhibits strong bias-dependent gain behavior: G_ms drops from 19.5 dB to 13.5 dB when frequency increases from 900 MHz to 1.8 GHz at I_C = 5 mA/V_CE = 8 V, while IP3 improves from 10 dBm to 14 dBm over the same I_C range at V_CE = 8 V - confirming its suitability for linearity-critical receive-path amplification.

Key Specifications

Pinout & Package

Supplied in SC75 (SOT-323) plastic surface-mount package: 1.2 mm × 2.1 mm × 0.9 mm, lead-free, RoHS-compliant, with gull-wing leads for reflow compatibility.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BFR181T E6327, BFP181E6327 offers identical RF performance with alternate reel coding, while MRF581 trades 2.5 GHz bandwidth and 0.65 dB NF penalty for through-hole assembly - making the BFR181T optimal for space-constrained, high-frequency SMT RF front-ends.

Availability

BFR181T E6327 is available at Aetrix Electronics and suitable for GSM receiver LNAs, EDGE front-end amplifiers, ISM band sensor transmitters, and UWB pulse amplifier stages requiring stable component supply with full traceability and no obsolescence risk.

Supply support for BFR181T 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, RF, and automotive ICs, with global R&D centers and ISO/TS 16949-certified wafer fabs.

The BFR181T belongs to Infineon's RF bipolar transistor product line, engineered specifically for high-frequency, low-noise amplification in cellular, ISM, and short-range wireless systems up to 6 GHz.

FAQ

What is the maximum recommended DC bias voltage for continuous operation?

The absolute maximum V_CEO is 12 V, but for reliable long-term operation at I_C = 5–12 mA, V_CE should be limited to 8 V. At this bias, junction temperature remains below 130°C with R_thJS = 405 K/W and board-level thermal relief, avoiding degradation of h_FE and noise figure over time.

Can BFR181T E6327 be used in 50 Ω matched push-pull configurations?

No - the BFR181T is a single NPN transistor optimized for common-emitter configuration. Its SPICE model and measured S-parameters assume unilateral operation. Push-pull use would require two matched devices with external phase-splitting and isolation networks, introducing instability risks not characterized in the datasheet.

Is the SC75 package compatible with standard reflow profiles for lead-free soldering?

Yes - the SC75 package is rated for peak reflow temperatures up to 260°C per J-STD-020. Thermal profile validation data shows no delamination or bond wire lift at 245°C peak for 60 seconds, provided board-side thermal mass is balanced and preheat ramp rate stays within 3°C/s.

How does ESD sensitivity affect PCB layout and handling?

The device is classified as ESD-sensitive (Class 1B per JS-001). Layout must avoid floating base traces; base pad must connect to grounded guard ring. Handling requires wrist straps, ionized air, and static-dissipative trays - ungrounded tweezers or dry-air environments cause latent failures in >1% of units per industry field data.