Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

Infineon Technologies BB689H7908XTSA1

Name: BB689H7908XTSA1
Brand: Infineon Technologies
SKU: BB689H7908XTSA1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: BB689H7908XTSA1

Manufacturer:: Infineon Technologies

Category:: Variable Capacitance (Varicaps, Varactors)

Package:: SC-80

Datasheet:: BB689H7908XTSA1.pdf

Description:: DIODE TUNING 30V 20MA SCD80

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:9,841

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

BB689H7908XTSA1 from Infineon Technologies is a silicon tuning diode (varactor) designed for VHF TV tuner front-end voltage-controlled oscillator (VCO) and RF filter tuning circuits. It delivers a capacitance range of 2.5–61.5 pF at 1 MHz, 20.9 typical capacitance ratio (CT₁/CT₂₈), 0.85 Ω typical series resistance, and operates up to 150°C ambient. Used in analog broadcast TV tuners requiring precise, stable frequency tracking.

For engineers reviewing the BB689H7908XTSA1 datasheet, BB689H7908XTSA1 pinout, BB689H7908XTSA1 application, or BB689H7908XTSA1 equivalent, key selection criteria include capacitance vs. reverse voltage profile, series resistance at 470 MHz, temperature coefficient of capacitance, and matching tolerance across production lots.

Technical Context

This varactor diode functions as a voltage-dependent capacitor in resonant tank circuits, where applied reverse bias (1–28 V) modulates junction depletion width to tune oscillation frequency. Its low r_S (0.85 Ω typ.) minimizes Q-factor degradation at VHF frequencies, and its tight ∆C_T/C_T ≤ 2% matching ensures consistent channel alignment across tuner modules.

The device uses an "in-line" matching assembly process to achieve high uniformity across batches. Its SC79 package supports surface-mount reflow with cathode-marked anisotropic thermal expansion behavior, and its −55°C to +150°C operating range enables deployment in thermally demanding tuner chassis environments.

Key Specifications

Parameter	Value and Actual Design Meaning
Capacitance @ 1 V	51–61.5 pF - sets minimum resonant frequency in VCO tank
Capacitance @ 28 V	2.5–2.9 pF - defines maximum resonant frequency and tuning range
Capacitance Ratio CT₁/CT₂₈	18–23.2 - determines total usable frequency span in VHF band (47–230 MHz)
Series Resistance r_S	0.85–1.2 Ω @ 470 MHz - directly limits Q-factor and phase noise in oscillator design
Reverse Voltage Rating	30 V DC - establishes safe bias headroom above typical 28 V tuning rail
Capacitance Matching	≤ ±2% across 7-diode sequence - enables batch-level calibration without per-unit trimming
Operating Temp Range	−55°C to +150°C - supports operation inside sealed metal tuner cans under sustained thermal load

Pinout & Package

BB689H7908XTSA1 is housed in the SC79 (SOD-523) plastic surface-mount package: 1.3 mm × 0.7 mm × 0.6 mm, single-anode/cathode configuration, cathode marked by laser dot on top surface.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Pin 1)	DC bias input / AC ground reference	Connected to fixed DC potential; forms low-impedance return path for RF signal in shunt-tuned topology
Cathode (Pin 2)	RF tuning node / variable capacitance terminal	Connected to LC tank inductor; reverse-bias voltage applied here controls depletion capacitance value

Key Features

Feature	Design Value
High capacitance ratio (20.9 typ.)	Enables full VHF band coverage (47–230 MHz) with single diode in standard LC tank
Low series resistance (0.85 Ω typ.)	Maintains tank Q > 100 at 100 MHz, reducing oscillator phase noise floor
In-line matching assembly	Guarantees ≤2% C_T variation across 7-device sequences for factory calibration
Pb-free RoHS-compliant packaging	Meets EU Directive 2011/65/EU; compatible with lead-free reflow profiles (peak 260°C)

Applications

Analog VHF TV Tuner Front-End

VHF Bandpass Filter Tuning

Use Scenario: Selecting broadcast channels in legacy analog terrestrial TV receivers operating in 47–230 MHz band.

IC Role / Device Role / Timing Role: Varactor diode providing voltage-controlled capacitance in parallel-resonant VCO tank circuit.

Use Value: 20.9 typical CT₁/CT₂₈ ratio enables full-band tuning without switched capacitor banks or inductor taps.

Use Scenario: Dynamically adjusting center frequency of bandpass filters in multi-standard TV IF stages.

IC Role / Device Role / Timing Role: Tuning element in shunt-connected LC network that tracks local oscillator drift.

Use Value: ≤2% capacitance matching allows pre-calibrated filter response curves across production units.

VHF FM Radio Receiver Tuning

Legacy Cable TV Descrambler Tuners

Use Scenario: Frequency synthesis in portable FM radios covering 87.5–108 MHz band with manual or digital tuning.

IC Role / Device Role / Timing Role: Voltage-variable capacitor in Colpitts oscillator feedback path.

Use Value: 0.85 Ω typical r_S sustains oscillator output power stability over temperature and supply variation.

Use Scenario: Channel selection in analog cable TV set-top boxes requiring stable tuning across 5–450 MHz spectrum.

IC Role / Device Role / Timing Role: Resonant element in broadband tuned amplifier input stage.

Use Value: −55°C to +150°C rating supports reliable operation inside enclosed, fanless descrambler enclosures.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BB669H7908XTSA1	Lower capacitance range (3.5–32 pF), lower CT₁/CT₂₈ (12.5 typ.), same SC79 package	Better suited for UHF tuning; narrower VHF span requires tighter bias control	Select when system bandwidth demand is <100 MHz and lower C_T minimizes stray coupling
BB689-02VXUMA1	Identical electrical specs; differs only in tape-and-reel packaging (8,000 pcs/reel vs. 3,000 pcs/reel)	No functional difference; identical placement and thermal behavior	Prefer for high-volume SMT lines requiring longer reel life and reduced changeover frequency

Compared with BB669H7908XTSA1, this part offers wider VHF tuning range and higher Q; versus BB689-02VXUMA1, it provides identical performance in smaller reel format-critical for pilot builds and qualification runs.

Availability

BB689H7908XTSA1 is available at Aetrix Electronics and suitable for analog TV tuners, VHF radio receivers, and legacy cable TV descramblers requiring stable component supply, tight capacitance matching, and high-temperature reliability.

Supply support for BB689H7908XTSA1 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, automotive, industrial, and RF components, with global R&D and manufacturing infrastructure.

BB689H7908XTSA1 belongs to Infineon's BB6xx silicon tuning diode product line, engineered specifically for high-uniformity, high-Q VHF frequency synthesis in broadcast receiver systems.

FAQ

What is the maximum recommended reverse voltage for continuous operation?

The absolute maximum DC reverse voltage is 30 V at 25°C ambient. Derating is required above 25°C: VR decreases linearly to 25 V at 125°C per Infineon's Absolute Maximum Ratings table. Exceeding 30 V risks junction breakdown and irreversible capacitance shift.

Does BB689H7908XTSA1 require external bias decoupling?

Yes. A 100 nF ceramic capacitor must be placed within 2 mm of the cathode terminal to suppress RF feedback into the bias line. Without it, VCO pushing effects increase by ≥5 kHz/V, degrading frequency stability during supply ripple events.

How does temperature affect capacitance tuning linearity?

Capacitance exhibits a negative temperature coefficient: −100 ppm/°C average between 1–28 V. At 85°C, CT₁ drops ~2.1 pF and CT₂₈ drops ~0.05 pF relative to 25°C values-requiring compensation in closed-loop tuner ICs.

Is BB689H7908XTSA1 suitable for use in 5G infrastructure equipment?

No. Its 470 MHz r_S characterization and VHF-optimized capacitance curve make it unsuitable for sub-6 GHz 5G FR1 bands. For those applications, Infineon's BAV99 or Skyworks' SMV123x series offer higher-frequency Q and tighter C-V linearity above 1 GHz.

BB689H7908XTSA1 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

BB689H7908XTSA1 FAQ

1.How can I place an order for BB689H7908XTSA1 through Aetrix?

Please submit a Request for Quotation (RFQ) for BB689H7908XTSA1 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 BB689H7908XTSA1 reliable?

The price and inventory of BB689H7908XTSA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BB689H7908XTSA1 is usually 5 days.

3.What payment methods are accepted for BB689H7908XTSA1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BB689H7908XTSA1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BB689H7908XTSA1?

BB689H7908XTSA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BB689H7908XTSA1 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 BB689H7908XTSA1?

For technical support, including BB689H7908XTSA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BB689H7908XTSA1 requirements.

6.How does Aetrix verify that BB689H7908XTSA1 is sourced from the original manufacturer or authorized distributors?

All BB689H7908XTSA1 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 BB689H7908XTSA1 meets industry standards.

7.What is the process for return or replacement of BB689H7908XTSA1?

All BB689H7908XTSA1 units undergo pre-shipment inspection (PSI). If there is an issue with BB689H7908XTSA1, 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 BB689H7908XTSA1 part is unused and in its original packaging.

Return procedure for BB689H7908XTSA1:

1.Submit a request within 90 days.

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

Tech Hub

2026-07-29 18650 Battery: Voltage, Capacity, Charging and Pack Design

18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…

2026-07-27 Hall Effect Sensor: Working Principle, Types, Circuits and Applications

Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…

2026-07-20 Product Change Notification (PCN) in Electronic Components: Meaning and Supply Chain Response

Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…

2026-07-19 Blend Door Actuator: Symptoms, Location, Reset and Replacement Guide

A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…

2026-07-17 Raspberry Pi Alternatives: Chip-Level Comparison, Compatibility and Replacement Guide

Engineering guide to Raspberry Pi alternatives, covering chip-level differences, Orange Pi, ROCK, Jetson, Banana Pi, NanoPi, Compute Module, Pico, GPIO, camera, HAT compatibility, and replacement risks…

2026-07-13 How to Test Dynamic Load Response in Low-Voltage High-Current Buck Converters

Engineering guide to dynamic load response testing for high-current buck converters, covering load step setup, slew rate, Vcore undershoot, overshoot, recovery time, probe location, output capacitors a…

2026-07-08 Output Capacitor Selection for High-Current ASIC Vcore Rails

Engineering guide to output capacitor selection for ASIC Vcore rails, covering bulk capacitors, polymer capacitors, MLCC decoupling, DC bias, ESR, ESL, placement, transient response and substitution ri…

2026-07-07 High-Current ASIC Core Power Supply Design: 12-Phase Buck, PMBus and Dynamic Load Response

Engineering guide to high-current ASIC Vcore rails, covering 12-phase buck architecture, PMBus control, dynamic load testing, output capacitor networks, smart power stage selection, thermal design and …

2026-07-06 Voltage Regulator: Types, Circuits, Testing and Selection Guide

Voltage regulator guide covering linear, LDO, 7805, Zener, adjustable, buck, VRM and alternator regulators, with design checks, testing methods, troubleshooting and datasheet-based selection.

2026-06-30 Amplifiers Explained: Types, Circuits, Gain, Classes and Applications

Amplifier guide covering voltage, current and power amplification, gain, feedback, amplifier classes, audio and RF applications, op-amp circuits, transimpedance amplifiers, datasheet selection and trou…