Infineon Technologies BB804SF2E6327HTSA1

Overview

BB804SF2E6327HTSA1 from Infineon Technologies is a silicon hyperabrupt junction varactor diode in SOT23 package with common-cathode dual-diode monolithic construction, designed for FM tuner tuning circuits. It delivers 42–47.5 pF capacitance at 2 V, 1.65–1.71 capacitance ratio (2 V/8 V), and −330 ppm/K temperature coefficient, enabling precise, low-distortion frequency tracking in stereo HiFi receivers.

For engineers reviewing the BB804SF2E6327HTSA1 datasheet, BB804SF2E6327HTSA1 pinout, BB804SF2E6327HTSA1 application, or BB804SF2E6327HTSA1 equivalent, key selection criteria include capacitance tolerance group (SF2 = 44–45.5 pF at 2 V), series resistance ≤0.18 Ω at 100 MHz, Q-factor ≥200, and guaranteed common-cathode symmetry for back-to-back VCO configurations.

Technical Context

This dual varactor diode integrates two matched hyperabrupt junctions sharing a single cathode terminal, enabling voltage-controlled oscillator (VCO) designs requiring symmetrical capacitance vs. voltage response. Its square-law C–V characteristic minimizes harmonic distortion in FM front-end tuning, while the −330 ppm/K temperature coefficient ensures stable center-frequency drift across −55 °C to +125 °C operating range.

The device operates under reverse bias only, with maximum 18 V DC reverse voltage and 20 V peak rating. Capacitance is specified at 1 MHz, and series resistance is measured at 100 MHz - reflecting RF tuning performance in VHF band applications such as 87.5–108 MHz FM radio receivers.

Key Specifications

Pinout & Package

SOT23-3 package with gull-wing leads; monolithic dual-diode structure featuring shared cathode (Pin 2), anode A (Pin 1), and anode B (Pin 3). RoHS-compliant, Pb-free termination.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BB804SF2E6327HTSA1, BBY52-02W offers smaller size but sacrifices tracking accuracy, while SMV1233-011LF improves RF loss but adds system-level matching complexity - making BB804SF2E6327HTSA1 optimal for production-ready, low-distortion FM tuners requiring zero-adjustment assembly.

Availability

BB804SF2E6327HTSA1 is available at Aetrix Electronics and suitable for FM radio tuner modules, automotive infotainment systems, and HiFi stereo receivers requiring stable component supply with tight capacitance binning and thermal stability.

Supply support for BB804SF2E6327HTSA1 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 AG is a German semiconductor manufacturer specializing in power management, RF, and automotive ICs, with global manufacturing and quality certification to ISO/TS 16949.

BB804 belongs to Infineon's RF varactor diode product line, engineered specifically for high-fidelity analog tuning in broadcast receivers where capacitance matching, low distortion, and thermal stability are critical.

FAQ

What does the 'SF2' marking indicate on BB804SF2E6327HTSA1?

The 'SF2' marking specifies the capacitance subgroup: at 2 V reverse bias, the device measures 44–45.5 pF. This tight binning ensures consistent tuning range and center frequency across production units, eliminating manual calibration in FM tuner assembly lines and supporting automated test pass/fail thresholds.

Can BB804SF2E6327HTSA1 be used in series or parallel configurations?

BB804SF2E6327HTSA1 is designed for back-to-back (anti-series) connection with shared cathode - not for series or parallel anode-cathode stacking. Using it in series would unbalance the common-cathode architecture and degrade C–V matching; parallel use violates its monolithic dual-junction design intent and risks thermal runaway due to mismatched leakage currents.

Is this diode suitable for VHF/UHF synthesizer applications beyond FM radio?

Yes - its 100 MHz Q-factor ≥200 and ≤0.18 Ω series resistance support stable operation up to 150 MHz. However, capacitance drops sharply above 100 MHz due to junction self-resonance; verified use cases include 136–174 MHz land-mobile radio VCOs when paired with low-inductance tank components and proper PCB layout.

How does the −330 ppm/K temperature coefficient impact real-world FM reception?

In a typical FM tuner operating from −25 °C to +70 °C, this tempco causes <±9.5 kHz center-frequency shift across the 87.5–108 MHz band - well within ±200 kHz channel spacing and below audible distortion thresholds. It eliminates need for thermistor compensation networks in cost-sensitive consumer audio designs.