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

Infineon Technologies BB689H7903XTMA1

Name: BB689H7903XTMA1
Brand: Infineon Technologies
SKU: BB689H7903XTMA1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BB689H7903XTMA1

Manufacturer:: Infineon Technologies

Category:: Variable Capacitance (Varicaps, Varactors)

Package:: SC-80

Datasheet:: BB689H7903XTMA1.pdf

Description:: DIODE TUNING 30V 20MA SCD80

Quantity:: RFQ Add To RFQ list

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Inventory:6,176

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Product details

Overview

BB689H7903XTMA1 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, a high capacitance ratio CT₁/CT₂₈ = 20.9, and low series resistance of 0.85 Ω at 470 MHz - enabling precise, low-loss frequency tuning in broadcast receiver applications.

For engineers reviewing the BB689H7903XTMA1 datasheet, BB689H7903XTMA1 pinout, BB689H7903XTMA1 application, or BB689H7903XTMA1 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 diode operates under reverse bias only, with capacitance varying inversely with applied DC tuning voltage (1–28 V). Its "in-line" matching assembly ensures tight inter-device capacitance uniformity critical for multi-stage VCOs and image-reject filters.

The device exhibits low parasitic series inductance (0.6 nH) and minimal temperature coefficient of capacitance (e.g., −10⁻⁴ /°C at VR = 10 V), supporting stable tuning over −55 °C to +150 °C ambient without external compensation.

Key Specifications

Parameter	Value and Actual Design Meaning
Capacitance @ 1 V, 1 MHz	51–61.5 pF - sets minimum oscillation frequency and tuning range lower bound
Capacitance @ 28 V, 1 MHz	2.5–2.9 pF - defines maximum oscillation frequency and tuning range upper bound
Capacitance Ratio CT₁/CT₂₈	18–23.2 - determines total VCO frequency tuning bandwidth (e.g., ~4.8:1 ratio)
Series Resistance @ 470 MHz	0.85–1.2 Ω - limits Q-factor degradation and phase noise in resonant tank circuits
Reverse Voltage Rating	30 V DC - supports wide tuning voltage swing while maintaining reliability in VHF tuner supplies
Capacitance Matching Tolerance	±2 % across 7-diode sequence - enables matched bank tuning in dual-conversion or diversity receivers
Operating Temperature Range	−55 °C to +150 °C - qualified for under-chassis TV tuner modules exposed to thermal cycling

Pinout & Package

BB689H7903XTMA1 is housed in the SC79 (SOD-523) surface-mount package: 1.3 mm × 0.7 mm × 0.5 mm, cathode-marked, single-diode configuration. The package supports reflow soldering and high-frequency layout integrity via minimized lead inductance.

Pin/Terminal	Circuit Role	Design Meaning
Anode	RF signal reference node	Connected to ground or AC-coupled RF node; forms low-inductance return path for tuning current
Cathode	DC tuning voltage input & RF tuning node	Bias voltage applied here controls depletion width; also serves as primary RF connection point in series-tuned VCO tanks

Key Features

Feature	Design Value
In-line capacitance matching	±2 % matching across 7-diode sequence - reduces calibration overhead in multi-band tuner ICs
Low series resistance	0.85 Ω typical at 470 MHz - preserves tank circuit Q > 100 at VHF frequencies
High capacitance ratio	20.9 typ. (1 V / 28 V) - enables > 4:1 frequency coverage without band-switching
Pb-free RoHS compliance	SC79 package with lead-free terminations - meets EU WEEE and China RoHS requirements for consumer TV assemblies
Wide temperature operation	Rated from −55 °C to +150 °C - supports placement near power stages in compact tuner modules

Applications

VHF TV Tuner Front-End

FM Radio Receiver VCO

Use Scenario: Analog/digital terrestrial TV tuner module operating in 47–230 MHz band with automatic channel search and fine-tuning.

IC Role / Device Role / Timing Role: Varactor diode providing voltage-controlled capacitance for VCO tank resonance adjustment.

Use Value: High CT₁/CT₂₈ ratio (20.9) and ±2 % matching enable single-VCO architecture covering full VHF band without mechanical switches or switched capacitor banks.

Use Scenario: Portable FM radio receiver requiring low-phase-noise local oscillator across 87.5–108 MHz.

IC Role / Device Role / Timing Role: Tuning element in Colpitts oscillator topology, biased via DAC-controlled voltage ramp.

Use Value: Low r_S (0.85 Ω) minimizes oscillator phase noise floor; SC79 footprint allows direct integration adjacent to inductor on compact PCB.

Set-Top Box Channel Selector

Cable TV Descrambler Tuner

Use Scenario: Multi-standard set-top box supporting DVB-T/T2/C/S2 with agile channel switching and adjacent-channel rejection.

IC Role / Device Role / Timing Role: Capacitance control element in switched-filter bank used for image rejection and IF selection.

Use Value: Tight capacitance matching (±2 %) ensures consistent filter center frequency shift across multiple tuned sections, reducing post-tuning alignment steps.

Use Scenario: Two-way cable modem headend tuner handling upstream/downstream RF paths up to 1 GHz.

IC Role / Device Role / Timing Role: Fine-tuning component in SAW-less RF front-end for dynamic carrier offset correction.

Use Value: Stable TC_C (−10⁻⁴ /°C) and 150 °C max operating temperature support reliable operation in thermally constrained DOCSIS 3.1 chassis environments.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BB689-02V	Same die, SCD80 package (1.8 × 0.8 mm); LS = 0.6 nH vs. SC79's 0.6 nH - identical RF performance	Larger footprint; less suitable for ultra-dense VHF layouts but easier for manual rework	Select when board assembly process favors larger pitch or requires higher thermal mass during reflow
BB669	Lower capacitance range (35–4.5 pF), CT₁/CT₂₈ = 15.5 typ.; r_S = 1.0 Ω - narrower tuning range, slightly higher loss	Optimized for UHF tuners (470–862 MHz); reduced VHF coverage below 100 MHz	Choose for UHF-dominant designs where smaller min-capacitance improves high-band resolution

Compared with BB689-02V and BB669, BB689H7903XTMA1 offers the widest VHF capacitance span and tightest matching in the smallest footprint - making it optimal for space-constrained, high-uniformity analog TV and FM tuner modules.

Availability

BB689H7903XTMA1 is available at Aetrix Electronics and suitable for VHF TV tuners, FM radio VCOs, set-top box channel selectors, and cable TV descrambler tuners requiring stable component supply across long-lifecycle consumer electronics programs.

Supply support for BB689H7903XTMA1 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, automotive, and security ICs, with global manufacturing and R&D centers.

BB689H7903XTMA1 belongs to Infineon's silicon tuning diode product line, engineered specifically for high-fidelity, low-phase-noise RF tuning in broadcast receiver front-ends - emphasizing capacitance linearity, matching, and thermal stability.

FAQ

What is the maximum reverse voltage BB689H7903XTMA1 can withstand continuously?

The absolute maximum DC reverse voltage is 30 V at 25 °C ambient. At elevated temperatures (e.g., 85 °C), derating is required per the datasheet's thermal resistance curve; peak reverse voltage with R ≤ 5 kΩ load is rated at 35 V, but sustained operation above 30 V risks irreversible junction breakdown and capacitance drift.

Does BB689H7903XTMA1 require a series current-limiting resistor in tuning circuits?

No external series resistor is needed for reverse-bias operation, as leakage current remains below 200 nA at 30 V and 85 °C. However, a high-value (e.g., 100 kΩ–1 MΩ) resistor is recommended between the tuning voltage source and cathode to prevent transient overvoltage during power-up or digital control glitches - protecting the diode's thin depletion layer.

How does capacitance matching across a batch affect VCO design?

With ±2 % capacitance matching across 7 devices in sequence, BB689H7903XTMA1 enables predictable VCO center frequency alignment without per-unit trimming. This reduces test time and calibration complexity in production, especially in multi-VCO architectures where mismatch would cause image frequency errors or degraded adjacent-channel rejection in TV tuners.

Can BB689H7903XTMA1 be used in DC-coupled tuning applications?

No - this is a reverse-biased varactor only. Forward conduction must be strictly avoided, as even brief forward bias (> 0.7 V) causes irreversible damage to the hyperabrupt junction. All tuning networks must ensure the anode remains at equal or higher potential than the cathode under all operating conditions, including transients and ESD events.

BB689H7903XTMA1 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

BB689H7903XTMA1 FAQ

1.How can I place an order for BB689H7903XTMA1 through Aetrix?

Please submit a Request for Quotation (RFQ) for BB689H7903XTMA1 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 BB689H7903XTMA1 reliable?

The price and inventory of BB689H7903XTMA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BB689H7903XTMA1 is usually 5 days.

3.What payment methods are accepted for BB689H7903XTMA1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BB689H7903XTMA1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BB689H7903XTMA1?

BB689H7903XTMA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BB689H7903XTMA1 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 BB689H7903XTMA1?

For technical support, including BB689H7903XTMA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BB689H7903XTMA1 requirements.

6.How does Aetrix verify that BB689H7903XTMA1 is sourced from the original manufacturer or authorized distributors?

All BB689H7903XTMA1 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 BB689H7903XTMA1 meets industry standards.

7.What is the process for return or replacement of BB689H7903XTMA1?

All BB689H7903XTMA1 units undergo pre-shipment inspection (PSI). If there is an issue with BB689H7903XTMA1, 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 BB689H7903XTMA1 part is unused and in its original packaging.

Return procedure for BB689H7903XTMA1:

1.Submit a request within 90 days.

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

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