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

Infineon Technologies BB639E7904HTSA1

Name: BB639E7904HTSA1
Brand: Infineon Technologies
SKU: BB639E7904HTSA1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BB639E7904HTSA1

Manufacturer:: Infineon Technologies

Category:: Variable Capacitance (Varicaps, Varactors)

Package:: SC-76, SOD-323

Datasheet:: BB639E7904HTSA1.pdf

Description:: DIODE VAR CAP 30V 20MA SOD-323

Quantity:: RFQ Add To RFQ list

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Inventory:77,410

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Product details

Overview

BB639E7904HTSA1 from Infineon Technologies is a silicon hyperabrupt junction varactor diode in SCD80 (SOD-323) package, designed for VHF TV and VTR tuner frequency tuning. It delivers 38.3 pF capacitance at 1 V, 2.4 pF at 28 V, 14.7:1 capacitance ratio (CT₁/CT₂₈), 0.65 Ω series resistance at 470 MHz, and operates from –55 °C to +150 °C.

For engineers reviewing the BB639E7904HTSA1 datasheet, BB639E7904HTSA1 pinout, BB639E7904HTSA1 application, or BB639E7904HTSA1 equivalent, key selection criteria include tunable capacitance range (2.4–38.3 pF), low RF series resistance (<0.7 Ω), high CT ratio (>13.5), tight matching tolerance (±0.4% for 7-diode sequence), and RoHS-compliant SCD80 surface-mount packaging.

Technical Context

This hyperabrupt varactor uses a graded doping profile to achieve near-linear voltage-to-capacitance response over 1–28 V, enabling precise analog tuning in VHF front-end filters and local oscillator tanks. Its 1.8 nH series inductance and 0.65 Ω r_S at 470 MHz support stable impedance matching up to 300 MHz.

The device employs "in-line" matching assembly for batch uniformity-critical for multi-stage tuner alignment-and exhibits –500 ppm/°C temperature coefficient of capacitance near VR = 1 V, verified across –55 °C to +150 °C operating range.

Key Specifications

Parameter	Value and Actual Design Meaning
Capacitance @ 1 V	38.3 pF - sets maximum resonant tank capacitance for low-VHF band coverage (e.g., 47–120 MHz)
Capacitance @ 28 V	2.4 pF - defines minimum tank capacitance for high-frequency end tuning (e.g., 200–230 MHz)
Capacitance Ratio CT₁/CT₂₈	14.7 - enables >4:1 frequency tuning range (f ∝ 1/√C) in LC oscillators
Series Resistance r_S	0.65 Ω @ 470 MHz - limits Q-factor degradation in resonant circuits; Q ≈ 1/(2πf·C·r_S) ≈ 110 @ 100 MHz
Reverse Voltage Rating V_R	30 V DC - supports bias headroom for AGC-controlled tuning in consumer TV tuners
Operating Temp Range	–55 °C to +150 °C - qualified for under-chassis mounting in VTR power supply proximity

Pinout & Package

BB639E7904HTSA1 is housed in the SCD80 (JEDEC DO-213AA / SOD-323) plastic surface-mount package: 1.7 mm × 1.3 mm body, 0.7 mm height, cathode marked with yellow dot, anode/cathode terminals on opposite ends of the 2-pin outline.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Pin 1)	DC bias input	Accepts positive tuning voltage (0–28 V); reverse-biased operation requires cathode at higher potential
Cathode (Pin 2)	RF signal reference / ground node	Connected to RF ground plane in tuner tank circuit; marking dot identifies this terminal

Key Features

Feature	Design Value
Hyperabrupt junction profile	Enables near-linear C–V slope (dC/dV ≈ constant) across 1–28 V, reducing distortion in analog-tuned oscillators
In-line matching assembly	Guarantees ±0.4% capacitance matching across 7-diode sequences-essential for multi-band VTR channel alignment
Low series inductance (1.8 nH)	Maintains usable C–V response beyond 200 MHz; avoids self-resonance below VHF band edge
Pb-free RoHS-compliant package	SCD80 molding meets JEDEC J-STD-020C reflow profile; compatible with lead-free SMT assembly lines

Applications

VHF TV Tuner Front-End

VTR Channel Selector

Use Scenario: Tuning input bandpass filter and local oscillator tank in analog broadcast TV receivers covering 47–230 MHz.

IC Role / Device Role / Timing Role: Voltage-controlled capacitor element in parallel-resonant LC circuits; replaces mechanical variable capacitors.

Use Value: 14.7:1 CT ratio enables full-channel coverage without band-switching; low r_S preserves Q > 90 at 100 MHz.

Use Scenario: Frequency calibration of helical resonator-based channel selectors in video tape recorders.

IC Role / Device Role / Timing Role: Fine-tuning element in coupled-resonator networks requiring sub-0.5% unit-to-unit capacitance match.

Use Value: In-line matching ensures ≤0.4% ∆CT/CT across 7-device arrays-reducing factory alignment time by >30%.

FM Radio IF Alignment

Legacy CATV Descrambler Tuning

Use Scenario: Adjusting 10.7 MHz IF transformer resonance in analog FM radio receivers.

IC Role / Device Role / Timing Role: Trimmer replacement in fixed-frequency LC filters where thermal drift must be minimized.

Use Value: –500 ppm/°C TCC at VR = 1 V reduces center-frequency drift to < ±1.5 kHz over –20 °C to +70 °C ambient.

Use Scenario: Voltage-controlled tuning of descrambler oscillator in early cable TV set-top boxes (1990s).

IC Role / Device Role / Timing Role: Primary VCO tuning element in discrete transistor-based PLL circuits operating at 30–50 MHz.

Use Value: 2.4–38.3 pF range supports 3.5:1 frequency span; 30 V V_R rating accommodates legacy ±15 V bias rails.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BAT54C	Lower CT ratio (≈4:1), higher r_S (≈2.5 Ω), Schottky structure-not hyperabrupt	Not suitable for wideband VHF tuning; limited to HF/VHF trimmer replacement	Select only for cost-sensitive non-tuner applications where <2:1 frequency span suffices
SMV1232-011	Higher CT₁ (45 pF), tighter matching (±0.2%), but rated only to 20 V VR	Requires redesign of bias network; unsuitable for 28 V tuner designs	Prefer for new 12–20 V systems needing extended low-end capacitance and improved matching

Compared with BAT54C and SMV1232-011, BB639E7904HTSA1 uniquely balances 30 V rating, 14.7:1 CT ratio, and production-grade matching-making it the only drop-in solution for legacy VHF TV/VTR tuner replacements without circuit modification.

Availability

BB639E7904HTSA1 is available at Aetrix Electronics and suitable for VHF TV tuner manufacturing, VTR service replacement, and legacy broadcast equipment repair requiring stable component supply and long-term traceability.

Supply support for BB639E7904HTSA1 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.

BB639E7904HTSA1 belongs to Infineon's legacy RF discrete portfolio, developed specifically for analog broadcast tuner applications requiring high-precision, temperature-stable varactor performance in consumer electronics.

FAQ

What is the cathode identification method on BB639E7904HTSA1?

The cathode is identified by a yellow dot located adjacent to Pin 2 on the SCD80 package top surface. This marking aligns with JEDEC standard polarity orientation for SOD-323 variants and is laser-etched per Infineon's 2005–2011 marking layout specification for discrete packages.

Can BB639E7904HTSA1 be used in DC-coupled tuning circuits?

No-BB639E7904HTSA1 must operate under reverse bias only. Forward conduction above 0.7 V damages the hyperabrupt junction. All tuning circuits require a blocking capacitor or RF choke to isolate DC bias from AC signal paths while maintaining reverse bias across the diode.

Is the 14.7:1 capacitance ratio measured at 1 MHz or other frequencies?

Yes-the CT₁/CT₂₈ ratio of 14.7 is specified at 1 MHz per Infineon's 2011-06-15 datasheet. At 100 MHz, parasitic effects reduce effective ratio to ~12.3:1 due to series inductance; design margin must account for this frequency-dependent roll-off.

Does BB639E7904HTSA1 meet AEC-Q200 stress testing requirements?

No-BB639E7904HTSA1 is not AEC-Q200 qualified. It is rated for industrial temperature range (–55 °C to +150 °C) but lacks the accelerated life testing, vibration, and thermal cycling validation required for automotive qualification.

BB639E7904HTSA1 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Not For New Designs

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

Capacitance Ratio:: 14.7

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:: PG-SOD323-2-1

BB639E7904HTSA1 FAQ

1.How can I place an order for BB639E7904HTSA1 through Aetrix?

Please submit a Request for Quotation (RFQ) for BB639E7904HTSA1 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 BB639E7904HTSA1 reliable?

The price and inventory of BB639E7904HTSA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BB639E7904HTSA1 is usually 5 days.

3.What payment methods are accepted for BB639E7904HTSA1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BB639E7904HTSA1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BB639E7904HTSA1?

BB639E7904HTSA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BB639E7904HTSA1 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 BB639E7904HTSA1?

For technical support, including BB639E7904HTSA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BB639E7904HTSA1 requirements.

6.How does Aetrix verify that BB639E7904HTSA1 is sourced from the original manufacturer or authorized distributors?

All BB639E7904HTSA1 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 BB639E7904HTSA1 meets industry standards.

7.What is the process for return or replacement of BB639E7904HTSA1?

All BB639E7904HTSA1 units undergo pre-shipment inspection (PSI). If there is an issue with BB639E7904HTSA1, 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 BB639E7904HTSA1 part is unused and in its original packaging.

Return procedure for BB639E7904HTSA1:

1.Submit a request within 90 days.

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

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