Infineon Technologies BFS 386L6 E6327

Overview

BFS386L6 E6327 from Infineon Technologies is a dual NPN silicon RF transistor in TSLP-6-1 package, integrating two matched RF transistors (TR1: BFR360L3 die, TR2: BFR380L3 die) for low-noise amplifier and oscillator stages. It delivers 1.0 dB noise figure at 1.8 GHz (TR1), 14.5 dB max available gain at 1.8 GHz (TR1), and >10 dBm output power up to 3.5 GHz - used in 2G/3G front-end modules.

For engineers reviewing the BFS386L6 E6327 datasheet, BFS386L6 E6327 pinout, BFS386L6 E6327 application, or BFS386L6 E6327 equivalent, key selection criteria include dual-transistor noise matching, differential oscillator biasing, 6 V V_CEO rating per transistor, and TSLP-6-1 thermal resistance (R_thJS = 230 K/W for TR1, 140 K/W for TR2).

Technical Context

This dual-transistor RF device supports cascode or push-pull configurations with independent emitter-base-collector terminals for each transistor. TR1 is optimized for low-noise amplification (F = 1.0 dB @ 1.8 GHz, IC = 3 mA), while TR2 targets higher-power oscillation (P_-1dB = 11.5 dBm @ 1.8 GHz, IC = 40 mA).

Its f_T of 14 GHz (TR2), C_cb ≤ 0.5 pF (TR1), and C_eb ≤ 1.1 pF (TR2) enable stable operation up to 3.5 GHz. The integrated structure eliminates inter-die parasitic mismatch, critical for balanced RF signal paths in cellular transceivers.

Key Specifications

Pinout & Package

TSLP-6-1 (Thin Small Outline Package, 6-pin, 1.3 mm × 0.8 mm × 0.37 mm height) with exposed thermal pad. Pin pitch: 0.4 mm. Moisture sensitivity level (MSL): 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-transistor RF amplifier/oscillator applications.

Compared with BFS386L6 E6327, the halogen-free BFS386L6H6327 offers identical RF performance and thermal behavior but satisfies stricter material declarations, while E6327 itself remains the baseline industrial-grade version with full traceability and long-term availability.

Availability

BFS386L6 E6327 is available at Aetrix Electronics and suitable for GSM/UMTS front-end modules, 3G transceiver designs, and ISM-band 2.4 GHz oscillator circuits requiring stable component supply across multi-year production cycles.

Supply support for BFS386L6 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 is a German semiconductor manufacturer specializing in power management, RF, and automotive ICs, with leadership in silicon RF transistor technology since the 1990s.

The BFS386L6 belongs to Infineon's BFR/BFS series of high-frequency silicon transistors, designed specifically for cost-sensitive, space-constrained RF front-ends in 2G/3G/ISM wireless devices.

FAQ

What is the maximum operating frequency for stable small-signal gain?

The BFS386L6 E6327 maintains usable small-signal gain (|S21|² ≥ 6 dB) up to 3.5 GHz per transistor, verified by measured transducer gain data: TR1 delivers 8 dB at 3 GHz, TR2 delivers 6 dB at 3 GHz. Operation beyond 3.5 GHz is possible only in nonlinear oscillator mode, not linear amplification.

How should the thermal pad be connected on the PCB?

The TSLP-6-1 package includes an exposed thermal pad centered beneath the die. It must be soldered to a minimum 2.0 mm² copper pour connected to ground plane via ≥4 thermal vias (0.3 mm diameter). This achieves the specified R_thJS values and prevents junction temperature exceedance above 150°C under 380 mW TR2 dissipation.

Can TR1 and TR2 share the same bias network?

No - TR1 and TR2 have different optimal bias points: TR1 requires IC = 3 mA for lowest noise, TR2 requires IC = 40 mA for maximum output power. Shared bias causes severe gain/noise degradation in TR1 or thermal overstress in TR2. Independent base resistors and emitter degeneration networks are mandatory.

Is external matching required for 50 Ω systems?

Yes - Z_Sopt for minimum noise (TR1) is 11 + j12 Ω, not 50 Ω. A 3-element L-network (shunt C, series L, shunt C) is required between 50 Ω source and B1/E1 pins. Similarly, TR2 output (C2) needs conjugate matching to 50 Ω load for maximum power transfer, per measured S-parameters.