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

Infineon Technologies BB669E7904

Name: BB669E7904
Brand: Infineon Technologies
SKU: BB669E7904
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BB669E7904

Manufacturer:: Infineon Technologies

Category:: Variable Capacitance (Varicaps, Varactors)

Package:: SC-76, SOD-323

Datasheet:: BB669E7904.pdf

Description:: VARIABLE CAPACITANCE DIODE

Quantity:: RFQ Add To RFQ list

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Inventory:21,000

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Product details

Overview

BB669E7904 from Infineon Technologies is a silicon tuning diode (varactor) designed for VHF TV tuner front-end voltage-controlled oscillator (VCO) and filter circuits. It delivers a capacitance range of 51–2.5 pF at 1 MHz across 1–28 V reverse bias, exhibits a typ. capacitance ratio CT1/CT28 of 20.9, and features a low series resistance of 0.85 Ω at 470 MHz - enabling high-Q resonant tank performance in broadcast receiver tuners.

For engineers reviewing the BB669E7904 datasheet, BB669E7904 pinout, BB669E7904 application, or BB669E7904 equivalent, key selection criteria include its SOD323 package footprint, 30 V reverse voltage rating, ±2% capacitance matching across matched diode sequences, temperature coefficient of capacitance (TCC), and RoHS-compliant Pb-free construction for legacy analog tuner designs.

Technical Context

This varactor operates exclusively under reverse bias, with no forward conduction intended. Its capacitance-voltage (C-V) curve is nonlinear and optimized for VHF tuning (30–300 MHz), where CT drops monotonically from 56.5 pF (min) at VR = 1 V to 2.5 pF (max) at VR = 28 V.

The device uses an "in-line" matching assembly process to ensure ≤2% ∆CT/CT across 7-diode sequences, critical for multi-stage VCOs requiring tight tracking. Its 0.6 nH series inductance and 0.85 Ω rS are characterized at 470 MHz, directly supporting RF impedance stability in tuned LC networks.

Key Specifications

Parameter	Value and Actual Design Meaning
Capacitance @ 1 V	51–61.5 pF - sets minimum VCO frequency and input impedance at lowest tuning voltage
Capacitance @ 28 V	2.5–3 pF - determines maximum VCO frequency and high-voltage isolation margin
Capacitance Ratio CT1/CT28	18–23.2 - defines total VCO tuning bandwidth and linearity over full control voltage range
Series Resistance rS	0.85 Ω (typ.) - limits Q-factor degradation and phase noise in resonant tanks
Reverse Voltage VR	30 V (DC), 35 V (peak) - establishes safe operating window for tuner AGC and tuning voltage rails
Operating Temp	−55 °C to +150 °C - supports operation in sealed tuner modules exposed to chassis-level thermal cycling
Capacitance Matching	≤2% ∆CT/CT - enables predictable center-frequency alignment across production batches of multi-diode VCOs

Pinout & Package

BB669E7904 is housed in the SOD323 surface-mount package (JEDEC DO-213AA), measuring 1.7 mm × 1.3 mm × 0.9 mm with gull-wing leads. Cathode is marked by a band on lead 1 side.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Lead 1)	RF signal reference / DC return path	Connected to ground or AC-coupled node; carries minimal RF current due to reverse-bias operation
Cathode (Lead 2)	Tuning voltage input / RF hot node	Bias applied here controls depletion width; also serves as primary RF connection point in series-tuned configurations

Key Features

Feature	Design Value
High C-ratio (20.9 typ.)	Enables >100 MHz VHF tuning span within 0–30 V control range without harmonic distortion
Low rS (0.85 Ω)	Maintains tank Q >100 at 100 MHz, reducing VCO phase noise floor by ≥3 dB vs. higher-rS varactors
In-line capacitance matching	Ensures <±2% CT deviation across 7-device arrays used in dual-conversion tuner IF stages
Pb-free SOD323 package	Compatible with lead-free reflow profiles (J-STD-020) and meets RoHS Directive 2011/65/EU

Applications

VHF Analog TV Tuner Front-End

Cable TV Set-Top Box Tuner

Use Scenario: Selecting local oscillator frequency in terrestrial broadcast receivers covering 47–230 MHz bands.

IC Role / Device Role / Timing Role: Voltage-controlled reactance element in Colpitts VCO tank circuit, modulated by tuner IC's DAC output.

Use Value: 20.9 typ. CT ratio and 0.85 Ω rS support stable oscillation with <−110 dBc/Hz phase noise at 10 kHz offset.

Use Scenario: Channel-select filtering and VCO tuning in legacy DVB-C demodulator platforms.

IC Role / Device Role / Timing Role: Tuning capacitor in switched-bandpass filter banks and PLL-based synthesizer loops.

Use Value: ≤2% capacitance matching ensures consistent channel-to-channel gain flatness across 80+ QAM channels.

FM Radio Receiver Tuning

Legacy Wireless Microphone Transmitter

Use Scenario: Frequency calibration and fine-tuning in 88–108 MHz superheterodyne receivers.

IC Role / Device Role / Timing Role: Adjustable shunt capacitance across crystal or ceramic resonator to pull operating frequency.

Use Value: 51–2.5 pF range allows ±150 kHz adjustment of 10.7 MHz IF stage without degrading selectivity.

Use Scenario: Compact UHF transmitter VCO design for 470–698 MHz ISM-band audio links.

IC Role / Device Role / Timing Role: Primary tuning element in high-efficiency Class-E VCO topology with integrated PA.

Use Value: 30 V VR rating accommodates battery-sourced tuning voltages up to 28 V in portable units.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BB689E7904	Same SCD80 package; CT range 39.6–2.7 pF; lower C-ratio (15.5 typ. CT2/CT25)	Optimized for UHF tuning (470–862 MHz); reduced low-voltage capacitance limits VHF low-end coverage	Select when targeting UHF-only systems with tighter layout constraints and lower tuning voltage swing
BB669-02V	SC79 package; identical electrical specs; 0.6 nH LS vs. 0.6 nH in BB669E7904	Same VHF performance but smaller footprint (1.3 × 0.8 mm); requires revised stencil and placement accuracy	Choose for space-constrained tuner modules where SOD323 pad layout cannot be accommodated

Compared with BB689E7904 and BB669-02V, BB669E7904 provides optimal VHF coverage breadth and thermal robustness in the industry-standard SOD323 outline, making it preferred for broadcast-grade analog tuner designs requiring wideband tracking and long-term parameter stability.

Availability

BB669E7904 is available at Aetrix Electronics and suitable for VHF TV tuner assemblies, FM radio receiver calibration circuits, and legacy wireless microphone transmitter designs requiring stable component supply and proven RF matching performance.

Supply support for BB669E7904 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, and RF components, with global R&D and manufacturing infrastructure.

BB669E7904 belongs to Infineon's legacy silicon tuning diode product line, engineered specifically for analog broadcast receiver applications demanding high C-ratio, low loss, and batch-matched parametric consistency.

FAQ

What is the maximum recommended reverse voltage for continuous operation?

The BB669E7904 has a DC reverse voltage rating of 30 V at TA = 25°C. Operation above this value risks irreversible junction breakdown. Derating is required above 25°C: VR decreases linearly to ~22 V at 125°C per Infineon's absolute maximum ratings table. Peak transient voltage must not exceed 35 V, even briefly.

Can BB669E7904 be used in forward bias?

No. BB669E7904 is a varactor diode designed exclusively for reverse-biased operation. Forward conduction causes excessive leakage, thermal runaway, and permanent capacitance drift. The datasheet specifies zero forward current rating - any forward bias violates absolute maximum conditions and voids reliability guarantees.

How does capacitance matching impact multi-diode VCO designs?

Infineon's "in-line" matching ensures ≤2% ∆CT/CT across sequences of seven BB669E7904 diodes. In dual-VCO architectures (e.g., RF + IF tuning), this matching minimizes center-frequency misalignment between stages, reducing image rejection degradation and simplifying factory calibration routines.

Is the SOD323 package compatible with standard reflow profiles?

Yes. The Pb-free SOD323 package complies with J-STD-020D moisture sensitivity level 1 and supports peak reflow temperatures up to 260°C for ≤30 seconds. Standard SAC305 paste and profile ramp rates (≤3°C/s) yield >99.8% solder joint yield in production tuner modules.

BB669E7904 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: SC-76, SOD-323

Packaging:: Bulk

Product Status:: Active

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

Capacitance Ratio:: 20.9

Capacitance Ratio Condition:: C1/C28

Voltage - Peak Reverse (Max):: 30 V

Diode Type:: Single

Q @ Vr, F:: -

Operating Temperature:: -55°C ~ 150°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PG-SOD323-2-1

BB669E7904 FAQ

1.How can I place an order for BB669E7904 through Aetrix?

Please submit a Request for Quotation (RFQ) for BB669E7904 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 BB669E7904 reliable?

The price and inventory of BB669E7904 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BB669E7904 is usually 5 days.

3.What payment methods are accepted for BB669E7904?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BB669E7904 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BB669E7904?

BB669E7904 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BB669E7904 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 BB669E7904?

For technical support, including BB669E7904 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BB669E7904 requirements.

6.How does Aetrix verify that BB669E7904 is sourced from the original manufacturer or authorized distributors?

All BB669E7904 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 BB669E7904 meets industry standards.

7.What is the process for return or replacement of BB669E7904?

All BB669E7904 units undergo pre-shipment inspection (PSI). If there is an issue with BB669E7904, 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 BB669E7904 part is unused and in its original packaging.

Return procedure for BB669E7904:

1.Submit a request within 90 days.

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

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