NXP Semiconductors BFG310/XR,215

Overview

BFG310/XR from NXP Semiconductors is an NPN silicon planar epitaxial RF transistor in SOT143R package, designed for GHz-range wideband amplification with 14 GHz transition frequency (f_T), 1 dB noise figure at 2 GHz, and 18 dB maximum stable gain at 1.8 GHz - deployed in cellular front-end low-noise amplifier (LNA) stages.

For engineers reviewing the BFG310/XR datasheet, BFG310/XR pinout, BFG310/XR application, or BFG310/XR equivalent, this page delivers verified RF transistor specifications, dual-emitter SOT143R terminal mapping, GHz-band LNA design context, and validated alternative options for RF front-end replacement.

Technical Context

The BFG310/XR operates as a common-emitter NPN RF transistor optimized for low-noise, high-gain amplification up to 3 GHz. Its gold metallization ensures thermal stability under RF stress, while its dual-emitter configuration (pins 2 and 4) supports balanced input matching and improved linearity in broadband LNA designs.

It delivers 1.8 dBm output power at 1 dB compression and 8.5 dBm third-order intercept point (IP3) at 1.8 GHz under 5 mA/3 V bias, enabling high dynamic range in receiver front ends. The device's 0.17 pF collector-base capacitance and 530 K/W junction-to-solder-point thermal resistance support stable RF performance in compact surface-mount layouts.

Key Specifications

Pinout & Package

SOT143R (SC-61AA) plastic surface-mounted package with reverse pinning: 4-pin, 2.8 × 1.4 mm footprint, 0.95 mm height, gold-metallized leads for reliability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BFG310/XR, the BFG310/XR,115 offers identical RF performance but demands PCB rework for pinout alignment, while the MRF581 trades bandwidth and package compatibility for higher power handling - neither is pin-compatible, and both require circuit-level validation for noise, gain, and stability.

Availability

BFG310/XR is available at Aetrix Electronics and suitable for RF front-end designs in cellular handsets, DECT/PCN systems, SATV tuners, and fiber-optic repeaters requiring stable component supply, consistent parametric performance, and long-term obsolescence management.

Supply support for BFG310/XR 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

NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and consumer applications.

The BFG310/XR belongs to NXP's legacy RF transistor product line, engineered specifically for GHz-band low-noise amplification in portable wireless infrastructure - emphasizing reliability, reproducible RF parameters, and gold-metallized robustness for high-volume manufacturing.

FAQ

What is the maximum operating frequency supported by the BFG310/XR?

The BFG310/XR achieves a transition frequency (f_T) of 14 GHz under standard test conditions (IC = 5 mA, VCE = 3 V, f = 1 GHz). This allows practical use as a stable amplifier up to 3 GHz, with measured insertion gain (|s21|²) of 14 dB at 1.8 GHz and 11 dB at 3 GHz - making it suitable for DECT, PCN, and SATV tuner applications where bandwidth and linearity are critical. The BFG310/XR does not guarantee gain beyond 3 GHz in production circuits without custom matching.

How is the dual-emitter configuration of the BFG310/XR used in circuit design?

The BFG310/XR features two separate emitter terminals (pins 2 and 4) that share one base and collector. This enables differential input biasing, emitter degeneration for stability, or current splitting to reduce thermal gradients. In practice, designers often tie both emitters together for single-ended LNA use or apply slight voltage offsets to tune linearity and IP3. The BFG310/XR's dual-emitter architecture avoids the need for external emitter resistors in many RF front-end topologies.

What is the thermal resistance specification for the BFG310/XR, and how does it impact layout?

The BFG310/XR has a thermal resistance from junction to solder point (R_th(j-sp)) of 530 K/W, measured at T_sp ≤ 145 °C. Since the collector (pin 1) serves as the primary thermal path, PCB layout must maximize copper area and thermal vias beneath pin 1 to maintain junction temperature below 175 °C. The BFG310/XR's SOT143R package relies on solder-point conduction rather than case or ambient convection - inadequate thermal land design risks premature gain roll-off or parameter drift.

Can the BFG310/XR be used in 5 V RF systems?

No - the BFG310/XR has a maximum collector-emitter voltage (V_CEO) of 6 V and maximum collector-base voltage (V_CBO) of 15 V, but its recommended operating conditions specify V_CE = 3 V for RF performance characterization. Operating at 5 V exceeds the safe DC bias margin and risks accelerated degradation, especially under RF stress. The BFG310/XR is optimized for 2.7–3.3 V supply rails common in portable RF systems; using it at 5 V requires derating and is not supported by NXP's published characteristics or reliability data.

Is the BFG310/XR automotive qualified?

No - the BFG310/XR is not automotive qualified. Per NXP's legal disclaimers, this device is classified as a general-purpose RF transistor without AEC-Q200 qualification, automotive-grade screening, or extended temperature testing. It is rated for operation from −65 °C to +175 °C storage, but its specified RF parameters (e.g., noise figure, gain) are characterized only at Tamb = 25 °C. For automotive applications, the BFG310/XR must undergo full customer qualification, and NXP explicitly disclaims liability for use in safety-critical or life-support systems.