What this diode is and where it fits
The Infineon BAT1504RE6152HTSA1 is a dual-series Schottky diode pair in a SOT-23-3 package, designed for RF detector and mixer front-ends. The series-connected pair gives you two Schottky junctions sharing a common cathode, useful for balanced mixer topologies or as a voltage-doubler detector stage. Junction capacitance is 0.25 pF at zero bias, which keeps signal degradation low into the gigahertz range. Peak reverse voltage is 4 V and max forward current is 110 mA — this is a small-signal RF part, not a power rectifier. Rated junction temperature goes to 150 °C, covering hot RF enclosures without derating.
Ratings that decide the fit
The 0.25 pF capacitance at 0 V reverse bias is the spec that matters most for RF designers. It sets the upper frequency limit for detection and mixing — lower capacitance means less loading on the RF line and better sensitivity above 1 GHz. The 18 ohm series resistance at 5 mA forward current is typical for a small-signal Schottky and defines the conversion loss in a mixer. The 4 V peak reverse voltage limits use to low-level RF signals; if your input can swing above 4 V peak, this diode will break down. Max current of 110 mA is generous for detector bias but confirms this isn't intended for rectifying a power rail.
Lifecycle and sourcing
The BAT1504RE6152HTSA1 is active in production with no end-of-life notice. ROHS3 compliant.