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Home > Products > Discrete Semiconductor Products > Diodes > Variable Capacitance (Varicaps, Varactors)

Infineon Technologies BB659CH7902XTSA1

Name: BB659CH7902XTSA1
Brand: Infineon Technologies
SKU: BB659CH7902XTSA1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BB659CH7902XTSA1

Manufacturer:: Infineon Technologies

Category:: Variable Capacitance (Varicaps, Varactors)

Package:: SC-80

Datasheet:: BB659CH7902XTSA1.pdf

Description:: DIODE VAR CAP 30V 20MA SCD80

Quantity:: RFQ Add To RFQ list

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Inventory:8,922

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Product details

Overview

BB659CH7902XTSA1 from Infineon Technologies is a silicon hyperabrupt junction varactor diode in SC79 (SOD-323-compatible) package, designed for VHF TV and VTR tuner frequency tuning. It delivers 36.5–42 pF capacitance at 1 V reverse bias, 2.4–2.75 pF at 28 V, with 14.2–15.3:1 capacitance ratio and 0.6 nH series inductance.

For engineers reviewing the BB659CH7902XTSA1 datasheet, BB659CH7902XTSA1 pinout, BB659CH7902XTSA1 application, or BB659CH7902XTSA1 equivalent, key selection criteria include tunable capacitance range (1–28 V), low r_S (0.6 Ω typ.), tight matching (±0.5% over 4-diode sequence), RoHS-compliant SMT packaging, and operation up to +150°C.

Technical Context

This varactor operates via voltage-controlled depletion-layer width modulation, enabling precise analog tuning in resonant LC circuits. Its hyperabrupt doping profile ensures near-linear C–V slope in the 1–28 V range, critical for wideband VHF tracking stability.

The SC79 package's 0.6 nH LS and 0.6 Ω r_S minimize Q-factor degradation above 470 MHz, while "in-line" matching assembly guarantees ≤0.5% capacitance deviation across 4-device sequences used in multi-stage tuner front-ends.

Key Specifications

Parameter	Value and Actual Design Meaning
Capacitance @ 1 V	36.5–42 pF - sets low-end resonance frequency in VHF tuner tanks
Capacitance @ 28 V	2.4–2.75 pF - defines high-frequency cutoff and tuning range span
Capacitance Ratio (1 V / 28 V)	14.2–15.3:1 - enables ≥100 MHz continuous tuning bandwidth in 174–230 MHz band
Series Resistance @ 5 V / 470 MHz	0.6 Ω typ. - maintains Q > 100 at 200 MHz, minimizing insertion loss
Series Inductance	0.6 nH - limits self-resonance to >1.5 GHz, preserving tuning linearity below 300 MHz
Reverse Voltage Rating	30 V DC - supports standard tuner bias rails with 15% margin over 28 V max tuning voltage
Operating Temperature	−55 °C to +150 °C - qualified for automotive cabin and industrial tuner environments

Pinout & Package

SC79 package: 2-terminal surface-mount device with cathode marked by laser dot on top face; anode and cathode terminals occupy opposing ends of 1.7 mm × 0.8 mm body with 0.7 mm height and 0.35 mm lead pitch.

Pin/Terminal	Circuit Role	Design Meaning
Anode	DC bias injection point	Connected to fixed positive supply (e.g., +5 V to +28 V) through RF choke; blocks RF while passing tuning voltage
Cathode	RF signal node / AC ground reference	Connected directly to tank inductor; forms voltage-variable capacitor with anode; requires low-inductance PCB return path

Key Features

Feature	Design Value
Hyperabrupt junction profile	Enables linearized C–V response across 1–28 V, reducing distortion in analog FM/AM tuner IF stages
In-line matching assembly	Guarantees ≤0.5% CT deviation across 4-diode arrays used in dual-conversion VTR front-ends
Pb-free RoHS-compliant construction	Meets EU Directive 2011/65/EU without SnPb solder reflow compatibility compromises
Low-LS/low-r_S design	Preserves Q > 95 at 230 MHz, enabling < ±10 kHz frequency drift in temperature-compensated VHF oscillators

Applications

VHF TV Tuner Front-End

VTR High-Fidelity Audio Tuning

Use Scenario: Analog terrestrial TV reception in 174–230 MHz band with mechanical tuner replacement.

IC Role / Device Role / Timing Role: Voltage-variable capacitor in parallel-resonant LC tank with air-core inductor.

Use Value: 14.2:1 C-ratio enables full-band coverage with single 0–28 V tuning ramp; 0.6 nH LS prevents spurious resonance below 300 MHz.

Use Scenario: FM stereo demodulator local oscillator stabilization in professional video tape recorders.

IC Role / Device Role / Timing Role: Fine-tuning element in crystal-locked VCO loop filter network.

Use Value: ±0.5% capacitance matching across 4-diode array ensures < 50 kHz center-frequency drift between dual-channel audio carriers.

Automotive Cabin Radio Tuning

Industrial Spectrum Analyzer Preselector

Use Scenario: AM/FM radio module operating in vehicle cabin ambient (−40 °C to +85 °C).

IC Role / Device Role / Timing Role: Primary tuning diode in switched-capacitor bank for multi-band antenna matching.

Use Value: −55 °C to +150 °C rating ensures stable C–V curve across thermal cycling; 200 nA IR at 85 °C minimizes bias current drift.

Use Scenario: Input preselector filter in 100–500 MHz benchtop spectrum analyzers.

IC Role / Device Role / Timing Role: High-Q varactor in YIG-tuned bandpass filter control path.

Use Value: 0.6 Ω r_S sustains loaded Q > 120 at 350 MHz, enabling < 100 kHz RBW resolution without active compensation.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BB659CWH7902XTSA1	Same die, identical C–V curve and matching spec, but laser-marked 'H' instead of 'S'; same SC79 package	No functional difference; marking variant for traceability in specific OEM lines	Select when required by BOM revision control or legacy procurement system
BB659C-02V	Identical electrical specs, but packaged in SCD80 (slightly larger footprint, 1.3 mm × 0.7 mm vs. SC79's 1.7 mm × 0.8 mm)	Requires PCB land pattern change; same 4-diode matching performance	Choose only if SCD80 placement equipment or thermal mass requirements dominate

Compared with BB659C-02V and BB659CWH7902XTSA1, BB659CH7902XTSA1 offers identical tuning performance in the smallest SC79 footprint, enabling higher-density VHF tuner layouts without sacrificing matching accuracy or high-frequency Q.

Availability

BB659CH7902XTSA1 is available at Aetrix Electronics and suitable for VHF TV tuners, professional VTR systems, automotive infotainment radios, and test equipment preselectors requiring stable component supply across extended temperature ranges and high-volume production cycles.

Supply support for BB659CH7902XTSA1 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 R&D and manufacturing infrastructure.

BB659CH7902XTSA1 belongs to Infineon's RF discrete varactor family, engineered specifically for analog frequency tuning in broadcast receiver front-ends where capacitance linearity, matching, and high-temperature reliability are critical.

FAQ

What is the maximum recommended reverse voltage for continuous operation?

The absolute maximum DC reverse voltage is 30 V at 25 °C, with peak reverse voltage rated at 35 V for R ≥ 5 kΩ. Operation above 28 V reduces capacitance to ≤2.75 pF and increases sensitivity to voltage noise; sustained bias above 30 V risks irreversible junction breakdown per Infineon's 2011 datasheet ratings.

How does the capacitance matching specification apply in practice?

The ±0.5% ∆CT/CT applies to sequences of four BB659CH7902XTSA1 devices tested at 1 V and 28 V, measured consecutively on the same wafer lot. This enables direct substitution in multi-varactor tank networks-such as dual-conversion VTR oscillators-without individual calibration or binning.

Can this diode be used in RF power amplifier tuning circuits?

No-BB659CH7902XTSA1 is rated for ≤20 mA forward current and not characterized for RF power handling. Its 0.6 Ω series resistance and 0.6 nH inductance are optimized for small-signal VHF tuning, not PA impedance matching. Use Infineon's BFP series RF transistors or dedicated high-power varactors instead.

Is the SC79 package compatible with standard SOD-323 reflow profiles?

Yes-SC79 shares identical dimensions (1.7 mm × 0.8 mm × 0.7 mm), pad layout, and thermal mass with JEDEC-standard SOD-323. Standard lead-free reflow profiles (peak 260 °C, 60 s above 217 °C) apply; no process modification is needed for migration from SOD-323-based designs.

BB659CH7902XTSA1 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: SC-80

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Capacitance @ Vr, F:: 2.75pF @ 28V, 1MHz

Capacitance Ratio:: 15.3

Capacitance Ratio Condition:: C1/C28

Voltage - Peak Reverse (Max):: 30 V

Diode Type:: Single

Q @ Vr, F:: -

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SCD-80

BB659CH7902XTSA1 FAQ

1.How can I place an order for BB659CH7902XTSA1 through Aetrix?

Please submit a Request for Quotation (RFQ) for BB659CH7902XTSA1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for BB659CH7902XTSA1 reliable?

The price and inventory of BB659CH7902XTSA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BB659CH7902XTSA1 is usually 5 days.

3.What payment methods are accepted for BB659CH7902XTSA1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BB659CH7902XTSA1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BB659CH7902XTSA1?

BB659CH7902XTSA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BB659CH7902XTSA1 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for BB659CH7902XTSA1?

For technical support, including BB659CH7902XTSA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BB659CH7902XTSA1 requirements.

6.How does Aetrix verify that BB659CH7902XTSA1 is sourced from the original manufacturer or authorized distributors?

All BB659CH7902XTSA1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BB659CH7902XTSA1 meets industry standards.

7.What is the process for return or replacement of BB659CH7902XTSA1?

All BB659CH7902XTSA1 units undergo pre-shipment inspection (PSI). If there is an issue with BB659CH7902XTSA1, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The BB659CH7902XTSA1 part is unused and in its original packaging.

Return procedure for BB659CH7902XTSA1:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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