What this diode is and where it fits
The HVU359TRF-E is a variable capacitance diode from the * series, designed for tuning and voltage-controlled oscillator (VCO) applications where a capacitance that changes with reverse bias voltage is needed. Typical uses include RF front-end tuning, filter alignment, and phase-locked loop (PLL) circuits in communications equipment, test instrumentation, and broadcast infrastructure. The part is, which suits prototype builds and small-run production where tape-and-reel feed is not required.
Lifecycle and sourcing reality
The HVU359TRF-E carries an Active product status and is ROHS3 compliant. There is no official successor or second-source alternate listed, so the HVU359TRF-E stands as the sole order code for this specific tuning diode.