RF front-end transistor for automotive and industrial
The NXP BFU530XAR is an NPN silicon RF bipolar transistor in a SOT-143B surface-mount package, designed for low-noise amplification up to several gigahertz. Its headline figures — 22 dB gain at 900 MHz, 0.7 dB noise figure at the same frequency, and an 11 GHz transition frequency — make it a fit for receiver front-ends, VCO buffer stages, and driver amplifiers in automotive RF modules (telematics, keyless entry, tire-pressure monitoring) and industrial wireless links.
At 900 MHz the BFU530XAR delivers 22 dB of gain with a noise figure of 0.7 dB. In a typical LNA stage that means the transistor adds very little noise while providing enough gain to overcome the noise floor of a following mixer or SAW filter. The 11 GHz fT gives headroom for designs up to 2.4 GHz or higher with derated gain — useful for dual-band automotive receivers that cover both sub-GHz ISM and 2.4 GHz bands.
If a second-source or pin-compatible alternative is needed for dual-sourcing, no direct cross-reference is confirmed here — the SOT-143B footprint is shared with other NXP RF transistors.
SOT-143B footprint and automated assembly
The SOT-143B package is a four-lead variant of the SOT-143 with a collector pad layout common among NXP RF transistors.