A novel horizontal current bipolar transistor (HCBT), suitable for the integration with the pillar-like MOSFETs, is processed with the reduced volume of the parasitic regions, achieved by the partial etching of the collector -hill region and the self-protection of the p + extrinsic base from tetramethyl ammonium hydroxide etch-back. The HCBT fabricated by a low-cost technology exhibits the cutoff frequency ( ) of 30.4 GHz, the maximum frequency of oscillations ( max ) of 35 GHz and the collector-emitter breakdown voltage (BV CEO ) of 4.2 V, which are the highest and the highest BV CEO product among the lateral bipolar transistors (LBTs).Index Terms-BiCMOS integrated circuits, bipolar transistors, chemical vapor deposition (CVD), microwave measurements, semiconductor device ion implantation, silicon-on-insulator (SOI) technology.