Series 5VA

Optimal for use up to 350GHz

The 5VAxx structure represents three in series connected varactor anodes and two contact pads. Fabrication technology used herein provides for nearly ideal I-V behavior, i.e. very little reverse current and abrupt breakdown at a voltage close to the theoretical limit.

This allows for low losses (high efficiency) and high power-handling capability. 5VAxx diodes are fabricated by traditional planar technology and implemented on thinned down to 30µm s.i. GaAs substrate. Air-bridge interconnected mesas provide for a low parasitic capacitance and are fully passivated against harsh environment. Contact pads are gold finished.

Technology used for fabrication of 5VAxx diodes is similar as used for fabrication of space-qualified diodes for ESA space mission MetOp-SG, which is one of most stringent space missions concerning reliability issues.
5VAxx diodes can be mounted onto submount substrate by flip-chip soldering or gluing/sintering using conductive epoxies.

Due to particular material system and fabrication technology, these diodes survive temperatures up to 250°C without degradation, which may be required for soldering/sintering onto submount substrate.
Standard 5VAxx diodes are 5VAxx-13, which are optimal for use up to 350GHz, providing high breakdown voltage for high power handling capability. Alternatively, are offered diodes type 5VAxx-10, which have less breakdown voltage but a higher doping level of active semiconductor layer, assuming less electron saturation effects at frequencies >350GHz and somehow less series resistance for better conversion efficiency.

Available Configurations

Model NumberDelivery StatusData SheetJunction Capacitance Cj0 (fF/anode)Total CTotal Capacitance Ctot (fF)apacitanceCtoSeries Resistance Rs / Differential Resistance Rdiff (Ω)t (fF)Breakdown Voltage Ubd (V)

Three varactors in series on 30 µm thick GaAs-substrate.

Diode parameters are usually determined for each batch individually and may vary within up to 20% from nominal values.

Please ask on availability before ordering.

ACST reserve the right to change the information presented here without notice.