What this X-band mixer diode is
The Infineon BAT15-098LRH is a low-barrier Schottky diode array — two pairs with a common cathode — designed for X-band mixer and detector stages. Its key spec is the 0.5pF capacitance at zero bias (1 MHz), which keeps the RF insertion loss low up into the X-band. The 4V peak reverse voltage limits the local-oscillator drive level, so this is a small-signal mixer diode, not a power rectifier.
Capacitance and reverse voltage — what they mean for the RF front-end
The 0.5pF junction capacitance at 0V is the figure that determines how high in frequency this diode can mix before the capacitive reactance shunts the RF signal. For an X-band down-converter, that 0.5pF keeps the conversion loss in check. The 4V reverse rating means the LO and RF signal peaks must stay under 4V — typical for a low-barrier Schottky in a receiver front-end. Exceed that and you forward-bias the diode, distorting the IF output.
Package and handling for field swap
The BAT15-098LRH comes in a PG-TSLP-4-7 package — a 4-lead XFDFN. The common cathode is pin 1, marked by a dot on the package top.
Lifecycle and sourcing
The BAT15-098LRH is an active Infineon part, ROHS3 compliant. It is available through independent distribution.