Infineon Technologies BB831E7904HTSA1

Overview

BB831E7904HTSA1 from Infineon Technologies is a silicon hyperabrupt junction varactor diode in SOD323 package, designed for voltage-controlled tuning in satellite TV tuner front-ends. It delivers 7.8–9.8 pF capacitance at 1 V to 28 V reverse bias (1 MHz), 8.6 typ. capacitance ratio (CT1/CT28), ≤3% capacitance matching, and ≤1 Ω series resistance at 100 MHz - enabling precise VCO and filter tuning up to 2 GHz.

For engineers reviewing the BB831E7904HTSA1 datasheet, BB831E7904HTSA1 pinout, BB831E7904HTSA1 application, or BB831E7904HTSA1 equivalent, key selection criteria include reverse voltage rating (30 V), capacitance vs. bias curve linearity, temperature coefficient of capacitance (TCC), RF series resistance at operating frequency, and RoHS-compliant SOD323 packaging for high-density tuner PCB layouts.

Technical Context

This varactor operates as a voltage-dependent capacitor in resonant LC networks, where its hyperabrupt doping profile ensures near-linear frequency vs. tuning voltage response in UHF/VHF band applications. Its low rS (≤1 Ω @ 100 MHz) minimizes insertion loss in tank circuits, while tight ∆CT/CT (≤3%) supports channel-to-channel tracking in multi-tuner systems.

The device is characterized at 1 MHz for capacitance but specified for stable operation up to 2 GHz; its TCC varies with reverse voltage (e.g., −50 ppm/°C at VR = 1 V, −300 ppm/°C at VR = 28 V), requiring thermal-aware biasing in outdoor LNB modules.

Key Specifications

Pinout & Package

SOD323 surface-mount plastic package: 1.7 mm × 1.25 mm × 0.95 mm body, gull-wing leads, cathode marked by white band.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BB831E7904HTSA1, BBY52-02W trades tuning linearity for broader capacitance span below 1 GHz, while SMV1232-011 prioritizes voltage robustness over RF efficiency - making BB831E7904HTSA1 the optimal balance for cost-sensitive, high-volume DVB-S2 tuner designs demanding RoHS compliance and sub-1Ω RF loss.

Availability

BB831E7904HTSA1 is available at Aetrix Electronics and suitable for satellite TV tuner front-ends, LNB local oscillator modules, and DiSEqC switch matrix designs requiring stable component supply across automotive-grade temperature ranges and high-reliability RF performance.

Supply support for BB831E7904HTSA1 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 IATF 16949 and ISO 9001.

BB831E7904HTSA1 belongs to Infineon's RF varactor diode product line, engineered specifically for high-linearity, low-loss tuning in satellite broadcast receiver signal chains from L-band through Ku-band.

FAQ

What is the maximum recommended reverse voltage for continuous operation?

The absolute maximum DC reverse voltage is 30 V at TA = 25°C, with derating to 25 V above 85°C. Peak reverse voltage is rated at 35 V only when series resistance ≥5 kΩ limits current; sustained operation above 30 V risks junction breakdown and irreversible capacitance drift.

Does BB831E7904HTSA1 require external bias decoupling?

Yes - a minimum 100 nF ceramic capacitor must be placed within 2 mm of the cathode terminal to shunt RF energy away from the DC bias line. Without this, RF leakage into tuner control ICs causes spurious responses and gain compression in adjacent channels.

How does temperature affect capacitance tuning accuracy?

Capacitance exhibits voltage-dependent temperature coefficient: −50 ppm/°C at VR = 1 V, worsening to −300 ppm/°C at VR = 28 V. In LNB designs, this requires either closed-loop frequency lock or bias voltage compensation using NTC thermistors to hold channel center frequency within ±50 kHz over −40 °C to +85 °C ambient.

Is BB831E7904HTSA1 compatible with lead-free reflow profiles?

Yes - it is qualified for JEDEC J-STD-020D-compliant lead-free reflow with peak temperature up to 260 °C for 30 seconds. The SOD323 package withstands thermal cycling without delamination, and the white marking remains legible post-reflow, supporting automated optical inspection.