What this tuning diode does on your RF board
The Infineon BBY6502VH6327XTSA1 is a single silicon tuning diode — a varactor — in a SC-79/SOD-523 surface-mount package. It is designed for voltage-controlled oscillator (VCO) tank circuits, phase-locked loop (PLL) filters, and RF tuning applications where a variable capacitance follows the applied reverse bias. The key parameter for any varactor is the capacitance ratio: this part delivers a ratio of 10.9 between 0.3 V and 4.7 V reverse bias, giving you useful frequency pulling range in a compact footprint.
Voltage and current limits — stay inside the C-V curve
Peak reverse voltage is rated at 15 V. Exceeding that risks breakdown and a non-recoverable shift in the capacitance characteristic. Forward current is limited to 50 mA — this is a tuning diode, not a rectifier; it is biased in reverse for normal operation. The 15 V ceiling is the practical limit for the tuning voltage supply in your PLL or VCO design.
Temperature range — rated for the harsh environments
Operating junction temperature spans -55 °C to 150 °C. That military-grade range covers automotive under-hood, avionics, and outdoor telecom enclosures where ambient temperature swings are wide. The capacitance-temperature coefficient of a silicon varactor is typically low, but the 150 °C junction rating gives headroom for self-heating in dense RF modules.
Package and mounting — SC-79 / SOD-523
Housed in a SC-79 / SOD-523 package (Infineon code PG-SC79-2), this diode is a two-pin surface-mount device. Standard reflow soldering profiles for lead-free assemblies apply.
Lifecycle and compliance — active, RoHS3, no LTB watch
The BBY6502VH6327XTSA1 carries an Active lifecycle status from Infineon. It is ROHS3 compliant, meeting the latest EU restriction-of-hazardous-substances directive without exemptions.