Infineon Technologies BB659H7902XTSA1

Overview

BB659H7902XTSA1 from Infineon Technologies is a silicon hyperabrupt junction variable capacitance diode (varactor) designed for VHF band tuning in TV and VTR tuners. It delivers a 14.7:1 capacitance ratio (CT₁/CT₂₈), 2.4–40 pF tunable capacitance range at 1 MHz, and low series resistance of 0.65 Ω at 470 MHz - enabling precise, low-loss frequency synthesis in analog tuner front-ends.

For engineers reviewing the BB659H7902XTSA1 datasheet, BB659H7902XTSA1 pinout, BB659H7902XTSA1 application, or BB659H7902XTSA1 equivalent, key selection criteria include reverse voltage rating (30 V), capacitance matching tolerance (±0.4% across 7-diode sequences), temperature coefficient of capacitance (−5×10⁻⁴ /°C at VR = 1 V), and SCD80 package compatibility with high-density RF layouts.

Technical Context

This varactor employs a hyperabrupt doping profile to achieve a near-linear C–V relationship in the 1–28 V tuning range, optimizing tracking linearity for VHF TV tuner IF alignment. Its low series inductance (1.8 nH) and low series resistance (0.65 Ω typ.) minimize Q-factor degradation above 100 MHz.

The device is fabricated using Infineon's "in-line" matching assembly process, ensuring tight capacitance matching (±0.4% max ΔCT/CT) across multi-diode arrays - critical for balanced tuning circuits requiring phase coherence and image rejection in dual-conversion architectures.

Key Specifications

Pinout & Package

BB659H7902XTSA1 is housed in the SCD80 surface-mount package (JEDEC TO-236AB), a miniature 2-pin plastic case with cathode-marked lead and 0.7 mm pitch. The package supports reflow soldering per J-STD-020 and provides thermal resistance R_thJA ≈ 300 K/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BB639H7902XTSA1 and BBY52-02W, BB659H7902XTSA1 uniquely combines extended capacitance ratio (14.7:1), ultra-tight matching (±0.4%), and sub-0.7 Ω series resistance - making it optimal for production-critical VHF tuner designs demanding repeatability and low-phase-noise performance.

Availability

BB659H7902XTSA1 is available at Aetrix Electronics and suitable for VHF TV tuners, VTR channel selectors, dual-conversion receivers, and FM broadcast radios requiring stable component supply across long-lifecycle consumer electronics programs.

Supply support for BB659H7902XTSA1 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 R&D centers.

BB659H7902XTSA1 belongs to Infineon's RF discrete varactor family, engineered specifically for high-volume analog TV/VTR tuner modules requiring precision capacitance control and production-matched performance.

FAQ

What is the maximum recommended reverse voltage for continuous operation?

The absolute maximum DC reverse voltage is 30 V at TA = 25°C. Derating is required above 25°C: VR decreases linearly to 25 V at +125°C. Exceeding VR risks irreversible junction breakdown and permanent capacitance shift. Operation at VRM = 35 V is permitted only for transient peaks with R ≥ 5 kΩ current limiting.

How does the capacitance matching specification apply in practice?

The ±0.4% ΔCT/CT applies to devices grouped in 7-diode sequences during Infineon's in-line matching process - verified at VR = 1 V and VR = 28 V, 1 MHz. This enables direct substitution in matched-pair VCOs without binning or calibration, unlike standard varactors requiring post-assembly trimming.

Can BB659H7902XTSA1 be used in SOD323 footprint designs?

No. BB659H7902XTSA1 uses the SCD80 package (0.7 mm pitch, 1.3 mm body width), whereas SOD323 has 0.65 mm pitch and 1.7 mm body width. Mechanical incompatibility prevents drop-in replacement; PCB layout and stencil must match SCD80 dimensions per Infineon's outline drawing.

What is the typical Q-factor at 100 MHz and how is it calculated?

At 100 MHz and VR = 5 V, Q ≈ 102 is derived from Q = 1/(2πf·rS·CT), using CT ≈ 25 pF and rS = 0.65 Ω. Measured Q exceeds 100 across 50–200 MHz due to low series inductance (1.8 nH) and minimal dielectric loss - confirmed in Infineon's Application Note AN047.