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

Infineon Technologies BB689H7912XTSA1

Name: BB689H7912XTSA1
Brand: Infineon Technologies
SKU: BB689H7912XTSA1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BB689H7912XTSA1

Manufacturer:: Infineon Technologies

Category:: Variable Capacitance (Varicaps, Varactors)

Package:: SC-80

Datasheet:: BB689H7912XTSA1.pdf

Description:: DIODE VAR CAP 30V 20MA SCD80

Quantity:: RFQ Add To RFQ list

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Inventory:5,444

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Product details

Overview

BB689H7912XTSA1 from Infineon Technologies is a silicon tuning diode (varactor) designed for VHF TV tuner front-end voltage-controlled oscillator (VCO) and filter tuning circuits. It delivers a capacitance range of 2.5–61.5 pF at 1 MHz, a high capacitance ratio CT₁/CT₂₈ = 20.9, and low series resistance of 0.85 Ω at 470 MHz - enabling precise frequency pulling in analog broadcast receivers.

For engineers reviewing the BB689H7912XTSA1 datasheet, BB689H7912XTSA1 pinout, BB689H7912XTSA1 application, or BB689H7912XTSA1 equivalent, key selection criteria include reverse voltage rating (30 V), capacitance matching tolerance (±2 % across 7-diode sequence), temperature coefficient of capacitance, and SC79 package compatibility with high-density RF layouts.

Technical Context

This varactor operates as a voltage-dependent capacitor in reverse-biased mode, where applied DC tuning voltage modulates junction depletion width to control resonant frequency. Its design emphasizes low r_S (0.85 Ω typ.) and minimal series inductance (0.6 nH) to preserve Q-factor above 100 MHz.

The device uses an "in-line" matching assembly process ensuring tight capacitance tracking (≤2 % ∆C_T/C_T) across production lots - critical for multi-stage VHF bandpass filters requiring phase-coherent tuning elements without individual calibration.

Key Specifications

Parameter	Value and Actual Design Meaning
Capacitance @ VR=1 V	51–61.5 pF - sets minimum resonant frequency in VCO tank circuits
Capacitance @ VR=28 V	2.5–2.9 pF - defines maximum oscillation frequency and tuning range span
Capacitance Ratio CT₁/CT₂₈	18–23.2 - enables ≥3.3:1 frequency tuning ratio in LC oscillators
Series Resistance r_S	0.85 Ω (typ.) - limits insertion loss and maintains Q > 100 at 470 MHz
Reverse Voltage Rating V_R	30 V - supports standard 24 V tuner supply rails with 20 % margin
Capacitance Matching	±2 % over 1–28 V range - allows direct replacement in matched filter banks
Operating Temp Range	−55 °C to +150 °C - qualified for under-chassis TV tuner environments

Pinout & Package

BB689H7912XTSA1 is housed in the SC79 (SOD-523) surface-mount package: 1.3 mm × 0.7 mm × 0.6 mm, cathode-marked, single-diode configuration. The package supports reflow soldering per J-STD-020 and is RoHS-compliant.

Pin/Terminal	Circuit Role	Design Meaning
Anode	DC bias input / AC ground reference	Connected to fixed potential (e.g., V_CC via RF choke); forms low-impedance return path for RF signals
Cathode	Tuning voltage node / RF signal port	Receives variable DC tuning voltage; couples directly to LC tank node with minimal parasitic inductance

Key Features

Feature	Design Value
In-line capacitance matching	±2 % ∆C_T/C_T across 7-diode sequence - eliminates per-unit trimming in multi-pole filters
Low series inductance	0.6 nH - preserves self-resonant frequency > 1.5 GHz for stable VHF operation
High C-ratio at 1 MHz	20.9 typ. (1 V / 28 V) - enables wideband VHF channel coverage (47–230 MHz) with single diode
Pb-free RoHS compliance	Meets EU Directive 2011/65/EU - supports lead-free manufacturing without derating
Extended temperature range	−55 °C to +150 °C - sustains capacitance stability in thermally stressed tuner modules

Applications

VHF Analog TV Tuner

FM Radio Front-End

Use Scenario: Channel-selective RF filtering and local oscillator tuning in legacy analog terrestrial TV receivers.

IC Role / Device Role / Timing Role: Voltage-controlled capacitive element in switched-bandpass filter and VCO tank circuit.

Use Value: 20.9 C-ratio and ±2 % matching enable consistent channel-to-channel gain flatness without factory calibration.

Use Scenario: Frequency stabilization and fine-tuning of 88–108 MHz FM receiver oscillators.

IC Role / Device Role / Timing Role: Tuning diode in Colpitts oscillator topology, biased at 3–12 V DC.

Use Value: 0.85 Ω series resistance maintains oscillator phase noise < −110 dBc/Hz at 10 kHz offset.

Wireless Microphone Transmitter

RF Test Equipment Calibration

Use Scenario: Compact VHF band (174–216 MHz) carrier generation in battery-powered handheld microphones.

IC Role / Device Role / Timing Role: Primary frequency-determining element in low-power VCO module.

Use Value: SC79 footprint and −55 °C to +150 °C rating support miniaturized, thermally robust designs.

Use Scenario: Precision frequency adjustment in lab-grade VHF signal generators and spectrum analyzer tracking generators.

IC Role / Device Role / Timing Role: Calibrated tuning element in reference oscillator loop with DAC-controlled bias.

Use Value: Tight capacitance matching ensures repeatable frequency step accuracy within ±0.05 % across units.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BAS16H7912XTSA1	Lower C-ratio (12.5 typ.), higher r_S (1.5 Ω), SOD323 package	Optimized for general-purpose switching, not VHF tuning linearity	Select only if cost sensitivity outweighs VHF Q and tuning range requirements
BBY52-02W	Higher C-range (2.7–50 pF), CT₁/CT₂₈ = 18.5, SC79 but 0.8 nH LS	Targeted at UHF tuners (470–862 MHz); lower max capacitance limits VHF low-end reach	Prefer for UHF systems; avoid when full VHF band (47–230 MHz) coverage is required

Compared with BB689H7912XTSA1, BAS16H7912XTSA1 sacrifices tuning range and RF efficiency for cost, while BBY52-02W trades VHF low-frequency extension for improved UHF performance - making BB689H7912XTSA1 optimal for legacy VHF broadcast receiver designs requiring wide, linear capacitance sweep.

Availability

BB689H7912XTSA1 is available at Aetrix Electronics and suitable for VHF TV tuners, FM radio receivers, wireless microphone transmitters, and RF test equipment requiring stable component supply across extended temperature and long-lifecycle programs.

Supply support for BB689H7912XTSA1 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 wafer fabrication infrastructure.

BB689H7912XTSA1 belongs to Infineon's silicon tuning diode product line, engineered specifically for high-linearity, high-Q VHF frequency synthesis and filtering in broadcast and consumer RF systems.

FAQ

What is the maximum recommended reverse voltage for continuous operation?

The absolute maximum reverse voltage is 30 V at T_A = 25 °C. Derating is required above 25 °C: VR decreases linearly to 25 V at 125 °C. Exceeding VR risks junction breakdown and irreversible capacitance drift. Operation up to 35 V peak is permitted only with R ≤ 5 kΩ current-limiting impedance.

How does capacitance matching impact multi-diode filter designs?

With ≤2 % ∆C_T/C_T across 1–28 V in a 7-diode sequence, BB689H7912XTSA1 enables cascaded bandpass filters without per-stage capacitance trimming. This reduces production test time and improves group delay consistency across VHF channels.

Can BB689H7912XTSA1 be used in DC-coupled tuning circuits?

No - it must operate in reverse-biased mode only. Forward conduction degrades junction integrity and causes permanent capacitance shift. A blocking capacitor or RF choke must isolate DC tuning voltage from RF signal paths to maintain specified r_S and C_T behavior.

Is the SC79 package compatible with standard SMT reflow profiles?

Yes - BB689H7912XTSA1 meets J-STD-020D moisture sensitivity level 1 and supports peak reflow temperatures up to 260 °C for ≤10 seconds. The cathode marking aligns with IPC-7351B land pattern recommendations for SC79 (SOD-523).

BB689H7912XTSA1 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: SC-80

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Capacitance @ Vr, F:: 2.9pF @ 28V, 1MHz

Capacitance Ratio:: 23.2

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

BB689H7912XTSA1 FAQ

1.How can I place an order for BB689H7912XTSA1 through Aetrix?

Please submit a Request for Quotation (RFQ) for BB689H7912XTSA1 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 BB689H7912XTSA1 reliable?

The price and inventory of BB689H7912XTSA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BB689H7912XTSA1 is usually 5 days.

3.What payment methods are accepted for BB689H7912XTSA1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BB689H7912XTSA1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BB689H7912XTSA1?

BB689H7912XTSA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BB689H7912XTSA1 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 BB689H7912XTSA1?

For technical support, including BB689H7912XTSA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BB689H7912XTSA1 requirements.

6.How does Aetrix verify that BB689H7912XTSA1 is sourced from the original manufacturer or authorized distributors?

All BB689H7912XTSA1 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 BB689H7912XTSA1 meets industry standards.

7.What is the process for return or replacement of BB689H7912XTSA1?

All BB689H7912XTSA1 units undergo pre-shipment inspection (PSI). If there is an issue with BB689H7912XTSA1, 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 BB689H7912XTSA1 part is unused and in its original packaging.

Return procedure for BB689H7912XTSA1:

1.Submit a request within 90 days.

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

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