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

Infineon Technologies BB804SF2E6327

Name: BB804SF2E6327
Brand: Infineon Technologies
SKU: BB804SF2E6327
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BB804SF2E6327

Manufacturer:: Infineon Technologies

Category:: Variable Capacitance (Varicaps, Varactors)

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: BB804SF2E6327.pdf

Description:: VARIABLE CAPACITANCE DIODE

Quantity:: RFQ Add To RFQ list

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Inventory:40,000

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Product details

Overview

BB804SF2E6327 from Infineon Technologies is a silicon hyperabrupt junction varactor diode in SOT23 package with common-cathode dual-diode configuration, designed for FM tuner tuning circuits. It delivers 42–47.5 pF capacitance at 2 V, 1.65–1.71 capacitance ratio (C₂ᵥ/C₈ᵥ), and −330 ppm/K temperature coefficient, enabling precise, low-distortion frequency tracking in stereo HiFi receivers.

For engineers reviewing the BB804SF2E6327 datasheet, BB804SF2E6327 pinout, BB804SF2E6327 application, or BB804SF2E6327 equivalent, key selection criteria include reverse voltage rating (18 V), series resistance (0.18 Ω typ.), Q-factor (200 @ 100 MHz), capacitance subgroup coding (SF2 = C₂ᵥ = 44–45.5 pF), and SOT23 common-cathode terminal assignment.

Technical Context

This dual varactor integrates two matched hyperabrupt junctions on a single die with shared cathode, ensuring symmetrical capacitance-voltage (C-V) response and minimal tracking error in back-to-back tuning configurations. Its square-law C-V characteristic (CT ∝ V⁻ⁿ, n ≈ 2) supports linear frequency modulation in FM front-ends.

The device operates across −55 °C to +125 °C, with low series resistance (0.18 Ω typ.) and high Q (200 @ 100 MHz, 2 V) critical for minimizing insertion loss and phase noise in VCO and RF filter tuning networks.

Key Specifications

Parameter	Value and Actual Design Meaning
Capacitance @ 2 V	44–45.5 pF (SF2 subgroup; enables precise center-frequency alignment in 88–108 MHz FM band)
Capacitance Ratio C₂ᵥ/C₈ᵥ	1.65–1.71 (ensures ≥10:1 tuning range with low nonlinearity in LC tank circuits)
Reverse Voltage Rating	18 V DC (supports bias headroom for AGC-controlled tuning in automotive and portable radios)
Series Resistance rS	0.18 Ω typ. @ 100 MHz (minimizes RF loss and thermal noise in resonant circuits)
Q-Factor	200 @ 100 MHz, 2 V (directly impacts phase noise floor in voltage-controlled oscillators)
Temp. Coeff. TCC	−330 ppm/K @ 2 V (predictable drift compensation in temperature-stable FM synthesizers)
Reverse Leakage IR	≤200 nA @ 16 V, 65 °C (prevents bias instability and distortion in low-current tuning loops)

Pinout & Package

SOT23-3 package with common-cathode dual-diode structure: Pin 1 = Anode 1, Pin 2 = Cathode (shared), Pin 3 = Anode 2. Marking "SF1", "SF2", or "SF3" denotes capacitance subgroup; "SF2" identifies this unit's 44–45.5 pF at 2 V.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Anode of Diode 1	RF signal node for first varactor branch; connects to LC tank or VCO control line
Pin 2	Common Cathode	DC ground reference and AC RF return path; must be low-inductance connection
Pin 3	Anode of Diode 2	Second varactor anode for balanced tuning; enables push-pull capacitance modulation

Key Features

Feature	Design Value
Monolithic dual-diode with common cathode	Guarantees matched C-V curves and <0.5% tracking error between diodes over temperature
Hyperabrupt junction profile	Delivers near-square-law capacitance vs. voltage (n ≈ 2), enabling linear FM deviation
SF2 capacitance subgroup	Factory-trimmed 44–45.5 pF @ 2 V; eliminates manual binning in production FM tuner assembly
Pb-free SOT23 package	ROHS-compliant lead finish and reflow profile compatible with standard PCB assembly

Applications

FM Radio Tuner Front-End

VHF Band Voltage-Controlled Oscillator

Use Scenario: Dual-varactor tuning of LC resonator in analog FM radio receiver front-end.

IC Role / Device Role / Timing Role: Back-to-back varactor pair providing symmetric, low-distortion capacitance modulation for 88–108 MHz channel selection.

Use Value: Common-cathode matching ensures <1% capacitance mismatch across −30 °C to +85 °C, maintaining stereo separation >50 dB.

Use Scenario: Frequency tuning element in discrete VCO for VHF wireless microphone transmitter.

IC Role / Device Role / Timing Role: Voltage-variable reactance controlling oscillation frequency in Colpitts topology.

Use Value: Q ≥ 200 and rS ≤ 0.18 Ω minimize phase noise (−110 dBc/Hz @ 10 kHz offset) at 100 MHz.

HiFi Stereo Receiver Tuning

Automotive AM/FM Diversity Antenna Tuner

Use Scenario: Precision tuning network in high-fidelity analog stereo receiver with mechanical tuning potentiometer interface.

IC Role / Device Role / Timing Role: Dual varactor replacing mechanical variable capacitor; driven by op-amp-based bias voltage generator.

Use Value: SF2 subgroup guarantees ±0.75 pF tolerance at 2 V, enabling <5 kHz channel step accuracy without calibration.

Use Scenario: Dynamic impedance matching network for multi-band antenna switching in automotive infotainment head unit.

IC Role / Device Role / Timing Role: Tuning element in switched-capacitor matching circuit for AM (530–1710 kHz) and FM (88–108 MHz) bands.

Use Value: 18 V VR rating supports wide-range bias swing (0–16 V) required for broadband matching under varying vehicle electrical conditions.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BB805SF2E6327	Higher C₂ᵥ (49–51 pF), same SOT23/common-cathode, identical TCC and rS	Better suited for lower-frequency VCOs (e.g., 30–60 MHz) requiring higher tuning capacitance	Select when target LC tank requires >47 pF nominal tuning range at 2 V
SMV1232-011LF	Single-diode SOD-323, C₂ᵥ = 42–45 pF, rS = 0.25 Ω, no common-cathode pairing	Requires external matching for dual-tuning; lacks inherent tracking; higher rS increases phase noise	Choose only if board space constraints prohibit SOT23-3 or dual-diode symmetry is not required

Compared with BB804SF2E6327, BB805SF2E6327 offers +5 pF higher baseline capacitance for extended low-band coverage, while SMV1232-011LF trades matching precision and Q for smaller footprint-making BB804SF2E6327 optimal for FM tuner designs demanding tracking integrity and low-noise performance.

Availability

BB804SF2E6327 is available at Aetrix Electronics and suitable for FM radio tuners, HiFi stereo receivers, and automotive infotainment systems requiring stable component supply, tight capacitance binning, and ROHS-compliant packaging.

Supply support for BB804SF2E6327 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 manufacturing and quality certification to ISO/TS 16949.

The BB804 series belongs to Infineon's RF discrete varactor portfolio, engineered specifically for high-fidelity analog tuning in broadcast receivers and professional audio equipment where capacitance matching and temperature stability are critical.

FAQ

What does the 'SF2' marking indicate on BB804SF2E6327?

The 'SF2' marking specifies the capacitance subgroup: at 2 V reverse bias, this unit measures 44–45.5 pF. Subgroups SF1 (43–44.5 pF) and SF3 (45–46.5 pF) are also available. Each reel contains only one subgroup, and SF2 is optimized for mid-band FM tuning (98 MHz center).

Can BB804SF2E6327 be used in a single-diode configuration?

Yes - either anode (Pin 1 or Pin 3) can be used with the common cathode (Pin 2) as a standalone varactor. However, doing so forfeits the matched tracking benefit; the device's primary design value lies in its monolithic dual-diode symmetry for back-to-back applications.

Is BB804SF2E6327 suitable for 5G or WiFi front-ends?

No - its maximum usable frequency is limited by Q-factor and series resistance to ~200 MHz. It is specified and characterized for FM broadcast (88–108 MHz) and VHF applications. For 2.4 GHz or 5 GHz bands, discrete GaAs or SiC varactors with higher self-resonant frequency are required.

How does the −330 ppm/K temperature coefficient affect circuit design?

This negative temperature coefficient means capacitance decreases as temperature rises. In FM tuners, it counteracts the positive TCC of inductors, enabling passive temperature compensation of LC tank resonance. Designers use it to hold center frequency drift within ±10 kHz over −30 °C to +70 °C without active calibration.

BB804SF2E6327 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Bulk

Product Status:: Active

Capacitance @ Vr, F:: 47.5pF @ 2V, 1MHz

Capacitance Ratio:: 1.71

Capacitance Ratio Condition:: C2/C8

Voltage - Peak Reverse (Max):: 18 V

Diode Type:: 1 Pair Common Cathode

Q @ Vr, F:: 200 @ 2V, 100MHz

Operating Temperature:: -55°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PG-SOT23

BB804SF2E6327 FAQ

1.How can I place an order for BB804SF2E6327 through Aetrix?

Please submit a Request for Quotation (RFQ) for BB804SF2E6327 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 BB804SF2E6327 reliable?

The price and inventory of BB804SF2E6327 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BB804SF2E6327 is usually 5 days.

3.What payment methods are accepted for BB804SF2E6327?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BB804SF2E6327 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BB804SF2E6327?

BB804SF2E6327 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BB804SF2E6327 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 BB804SF2E6327?

For technical support, including BB804SF2E6327 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BB804SF2E6327 requirements.

6.How does Aetrix verify that BB804SF2E6327 is sourced from the original manufacturer or authorized distributors?

All BB804SF2E6327 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 BB804SF2E6327 meets industry standards.

7.What is the process for return or replacement of BB804SF2E6327?

All BB804SF2E6327 units undergo pre-shipment inspection (PSI). If there is an issue with BB804SF2E6327, 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 BB804SF2E6327 part is unused and in its original packaging.

Return procedure for BB804SF2E6327:

1.Submit a request within 90 days.

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

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