NXP Semiconductors BFT92,215

Overview

BFT92 from NXP Semiconductors is a PNP silicon RF transistor in SOT23 package, designed for high-frequency wideband amplification up to 5 GHz. It delivers 18 dB maximum unilateral power gain at 500 MHz, 2.5 dB noise figure, and −60 dB intermodulation distortion under specified RF conditions, enabling use in aerial amplifiers, spectrum analyzers, and radar front-ends.

For engineers reviewing the BFT92 datasheet, BFT92 pinout, BFT92 application, or BFT92 equivalent, this page provides verified technical context, validated SOT23 pin mapping, confirmed RF performance at 500 MHz and 5 GHz, thermal resistance (260 K/W), and direct PNP-wideband alternatives with documented parameter divergence.

Technical Context

The BFT92 operates as a high-frequency PNP bipolar junction transistor optimized for wideband small-signal amplification. Its 5 GHz transition frequency (f_T) and low feedback capacitance (0.7 pF) support stable gain and minimal phase distortion across VHF/UHF bands.

It requires negative biasing: V_CEO = −15 V, V_CBO = −20 V, and operates with DC collector current up to −25 mA. Thermal design must respect R_{th j–s} = 260 K/W and maximum junction temperature of 175 °C.

Key Specifications

Pinout & Package

Package: SOT23 (TO-236AB), plastic surface-mounted, 3-lead package with standard footprint (D = 3.0 mm, E = 2.8 mm, e = 1.9 mm).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP wideband RF amplifier applications.

Compared with BFR92 and MRF901, the BFT92 uniquely balances ultra-low intermodulation (−60 dB), compact SOT23 form factor, and PNP polarity-making it irreplaceable in space-constrained, low-distortion, negative-rail RF front-ends where polarity and footprint are fixed constraints.

Availability

BFT92 is available at Aetrix Electronics and suitable for aerial amplifiers, spectrum analyzers, radar receivers, and oscilloscope vertical amplifiers requiring stable component supply across legacy test equipment and broadcast infrastructure programs.

Supply support for BFT92 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 leader specializing in high-performance RF, analog, and mixed-signal solutions for communications, automotive, and industrial markets.

The BFT92 belongs to NXP's legacy RF transistor product line, engineered specifically for wideband, low-noise, high-linearity amplification in test and measurement, broadcast, and radar systems operating up to 5 GHz.

FAQ

What is the maximum operating frequency of the BFT92?

The BFT92 has a transition frequency (f_T) of 5 GHz, verified at I_C = −14 mA and V_CE = −10 V. While usable gain extends into the UHF band, its primary design target is stable wideband amplification up to 500 MHz with 18 dB GUM; actual system bandwidth depends on matching network and bias conditions. The BFT92 remains functional-but with diminishing gain-up to its f_T limit.

Is the BFT92 pin-compatible with the BFR92?

No, the BFT92 is not pin-compatible with the BFR92. Although both are SOT23-packaged RF transistors from NXP, the BFT92 is PNP (pin 1 = base, pin 2 = emitter, pin 3 = collector), while the BFR92 is NPN with reversed polarity and different internal pin assignment. Swapping them requires full circuit redesign including bias polarity, DC blocking, and impedance matching-no PCB changes can be avoided.

What is the thermal resistance of the BFT92 and how does it affect layout?

The BFT92 has a thermal resistance from junction to soldering point (R_{th j–s}) of 260 K/W. This means each watt of dissipated power raises the junction temperature by 260 K above the solder point temperature. To stay within the 175 °C max junction limit, the collector tab must be soldered to adequate copper area-typically ≥25 mm² of 2-oz copper-to maintain T_s ≤95 °C at full 300 mW dissipation. Layout must avoid thermal bottlenecks near pin 3.

Can the BFT92 be used in a 50 Ω system design?

Yes, the BFT92 is routinely deployed in 50 Ω RF systems. Its 18 dB GUM and 2.5 dB noise figure are characterized at 500 MHz with 50 Ω source/load impedances. Matching networks using microstrip stubs or lumped LC elements achieve broadband 50 Ω input/output return loss <10 dB across 100–1000 MHz. The low 0.7 pF Cre simplifies neutralization, making stable 50 Ω operation achievable without complex feedback compensation.

What does the −60 dB intermodulation distortion specification mean for real-world use?

The −60 dB dim value for BFT92 is measured per DIN 45004B under defined two-tone conditions (f_p = 495.25 MHz, f_q = 503.25 MHz, f_r = 505.25 MHz) into a 75 Ω load. In practice, this confirms the BFT92 maintains high linearity in multi-carrier environments-such as cable TV distribution or spectrum monitoring-where third-order intermodulation products must remain ≥60 dB below fundamentals to avoid adjacent-channel interference or measurement error in the BFT92-based amplifier stage.