Infineon Technologies BB565H7908XTSA1

Overview

BB565H7908XTSA1 from Infineon Technologies is a silicon hyperabrupt junction varactor diode in SC79 (SOD-523) package, designed for UHF-TV tuner voltage-controlled oscillators and RF filter tuning. It delivers 18.5–21.5 pF capacitance at 1 V, 1.8–2.2 pF at 28 V, 9–11× capacitance ratio (CT₁/CT₂₈), and 0.6 Ω series resistance at 470 MHz - enabling precise, low-loss frequency synthesis in compact consumer tuners.

For engineers reviewing the BB565H7908XTSA1 datasheet, BB565H7908XTSA1 pinout, BB565H7908XTSA1 application, or BB565H7908XTSA1 equivalent, key selection criteria include capacitance vs. voltage curve linearity, temperature coefficient (−5×10⁻⁴ to −3×10⁻³ /°C across bias), matching tolerance (±0.7% over 4-diode sequence), AEC-Q101 qualification, and RoHS-compliant Pb-free packaging.

Technical Context

This varactor operates via voltage-dependent depletion-layer width modulation, with hyperabrupt doping profile engineered to yield near-linear frequency vs. tuning voltage response in VCOs. Its 0.6 nH series inductance and 0.6 Ω series resistance minimize Q-factor degradation above 470 MHz.

The device exhibits a measured capacitance temperature coefficient of −4.2×10⁻⁴ /°C at VR = 1 V and −2.8×10⁻³ /°C at VR = 25 V, supporting stable oscillator center-frequency drift control across −55 °C to +150 °C operating range.

Key Specifications

Pinout & Package

SC79 (SOD-523) surface-mount package: 1.2 mm × 0.8 mm × 0.55 mm body, cathode-marked top-side laser marking, single-anode/single-cathode configuration, optimized for high-frequency parasitic minimization.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar varactor diode applications.

Compared with BB545H7908XTSA1 and BB565H7907XTSA1, BB565H7908XTSA1 offers optimal balance of UHF coverage (47–862 MHz), tight matching for multi-channel systems, and proven thermal stability in automotive thermal cycles - making it the preferred choice for new DVB-T2 and ATSC 3.0 tuner designs.

Availability

BB565H7908XTSA1 is available at Aetrix Electronics and suitable for digital terrestrial TV tuners, automotive infotainment radios, set-top box RF front-ends, and portable media player receivers requiring stable component supply across long-lifecycle consumer and automotive programs.

Supply support for BB565H7908XTSA1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Infineon Technologies is a German semiconductor manufacturer specializing in power management, RF, and automotive electronics, with leadership in high-reliability discrete components and embedded security solutions.

BB565H7908XTSA1 belongs to Infineon's BB5xx varactor family, engineered specifically for high-volume, cost-sensitive UHF TV and radio tuner applications demanding AEC-Q101 reliability and tight parametric matching.

FAQ

What is the maximum recommended reverse voltage for continuous operation?

The BB565H7908XTSA1 has a rated DC reverse voltage of 30 V and a peak reverse voltage of 35 V. For reliable long-term operation in automotive environments with potential load-dump transients, Infineon specifies derating to ≤25 V DC under sustained bias conditions above 85 °C ambient.

Does this varactor require external bias decoupling, and what value is recommended?

Yes - a minimum 100 pF NP0/C0G ceramic capacitor must be placed within 2 mm of the cathode terminal to suppress RF feedthrough into the tuning voltage rail. At 862 MHz, a 220 pF capacitor is recommended to maintain impedance <1 Ω across the 470–862 MHz band.

How does capacitance matching impact multi-channel tuner calibration?

With ±0.7% matching across four diodes, BB565H7908XTSA1 enables factory calibration of 128-channel DVB-T2 presets using a single lookup table. This eliminates per-unit trimming, reducing test time by 2.3 seconds per unit and improving channel spacing accuracy to ±25 kHz over −30 °C to +85 °C.

Is the SC79 package compatible with standard SMT reflow profiles?

Yes - the Pb-free SC79 package is qualified for IPC/JEDEC J-STD-020D Level 1 moisture sensitivity and supports peak reflow temperatures up to 260 °C (25 °C to peak in ≤60 s). Recommended profile uses 150–180 °C preheat, 60–90 s soak at 180–200 °C, and 245–260 °C peak for 10–15 s.