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Infineon Technologies BB 689 E7902
- Part No.:
- BB 689 E7902
- Manufacturer:
- Infineon Technologies
- Package:
- SC-80
- Datasheet:
-
BB 689 E7902.pdf
- Description:
- DIODE VAR CAP 30V 20MA SCD-80
- Quantity:
- Payment:
- Shipping:
Inventory:5,741
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Product details
Overview
BB689 E7902 from Infineon Technologies is a silicon tuning diode (varactor) designed for VHF TV tuner front-ends, featuring a capacitance range of 2.5–61.5 pF at 1 MHz, capacitance ratio CT1/CT28 = 20.9, and low series resistance of 0.85 Ω (typ.) at 470 MHz - enabling precise frequency tracking in analog broadcast receivers.
For engineers reviewing the BB689 E7902 datasheet, BB689 E7902 pinout, BB689 E7902 application, or BB689 E7902 equivalent, key selection criteria include reverse voltage rating (30 V), temperature coefficient of capacitance, matching tolerance (±2 % across 7-diode sequence), and SC79 package compatibility with high-density RF layout requirements.
Technical Context
This varactor operates under reverse-bias conditions only, where junction capacitance varies nonlinearly with applied DC voltage - optimized for VHF band (30–300 MHz) tuning circuits requiring stable, repeatable C-V response. Its "in-line" matching assembly ensures tight capacitance uniformity across production lots.
The device exhibits a typical series inductance of 0.6 nH and temperature coefficient of capacitance (TCC) ranging from –5×10⁻⁴ to –1×10⁻³ /°C depending on bias, supporting predictable drift compensation in ambient-varying tuner modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Capacitance @ 1 V | 51–61.5 pF - sets minimum resonant frequency in LC tank when biased near zero volts |
| Capacitance @ 28 V | 2.5–2.9 pF - defines maximum resonant frequency and tuning range upper limit |
| Capacitance Ratio CT1/CT28 | 18–23.2 - determines total usable frequency span in VHF tuner applications |
| Series Resistance rS | 0.85 Ω (typ.) - limits Q-factor degradation and insertion loss in resonant circuits |
| Reverse Voltage VR | 30 V - establishes maximum bias headroom before leakage or breakdown in tuner supply rails |
| Capacitance Matching ∆CT/CT | ≤2 % - enables consistent channel alignment across multi-tuner or diversity receiver designs |
| Operating Temp Range | –55 °C to +150 °C - supports operation in sealed tuner modules exposed to chassis-level thermal cycling |
Pinout & Package
BB689 E7902 is housed in the SC79 (SOD-523) surface-mount package - a single-anode, cathode-marked, ultra-compact 1.3 mm × 0.7 mm outline with 0.2 mm pitch, optimized for high-frequency RF layout and reflow compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | DC bias reference node | Connected to ground or fixed DC potential; forms cathode-to-anode junction defining variable capacitance |
| Cathode | RF signal node / tuning voltage input | Connected to LC tank's RF path and variable DC tuning voltage; polarity must be maintained to avoid forward conduction |
Key Features
| Feature | Design Value |
|---|---|
| High capacitance ratio | CT1/CT28 = 20.9 - delivers >4:1 frequency tuning range without switching capacitors |
| In-line matching assembly | ±2 % capacitance matching over 1–28 V - eliminates per-unit calibration in mass-produced tuners |
| Low series resistance | rS = 0.85 Ω (typ.) - maintains Q > 100 at 100 MHz, critical for adjacent-channel rejection |
| Pb-free RoHS compliance | SC79 package meets EU Directive 2011/65/EU - supports global manufacturing and end-of-life compliance |
| Wide operating temperature | –55 °C to +150 °C - sustains performance in thermally stressed tuner enclosures near power supplies |
Applications
| Analog VHF TV Tuner Front-End | CATV Set-Top Box Tuner |
|---|---|
Use Scenario: Selecting VHF channels (47–230 MHz) in legacy analog broadcast receivers using LC resonance. IC Role / Device Role / Timing Role: Varactor diode providing voltage-controlled capacitance in parallel-resonant tank circuit. Use Value: 20.9:1 capacitance ratio enables full-band coverage with single-stage tuning, reducing component count and board space. | Use Scenario: Channel selection in cable TV receivers operating up to 250 MHz with legacy analog demodulation paths. IC Role / Device Role / Timing Role: Tuning element in broadband front-end filter banks requiring stable C-V linearity. Use Value: ±2 % inter-device capacitance matching allows factory-set alignment without individual trimming, cutting test time by >30 %. |
| VHF Radio Transceiver Local Oscillator | FM Radio Receiver Tuning Circuit |
Use Scenario: Frequency synthesis in portable VHF two-way radios (136–174 MHz) with analog PLL architectures. IC Role / Device Role / Timing Role: Voltage-variable capacitor in VCO tank, directly modulated by tuning voltage from loop filter. Use Value: Low 0.85 Ω series resistance preserves oscillator phase noise floor below –110 dBc/Hz at 10 kHz offset. | Use Scenario: Band selection in automotive FM radios (87.5–108 MHz) using discrete LC tuning networks. IC Role / Device Role / Timing Role: Bias-controlled reactance element adjusting resonant peak of IF or RF stage filters. Use Value: Stable TCC (–3×10⁻⁴ /°C typ.) minimizes station drift during cabin temperature swings from 0 °C to 70 °C. |
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 | Identical electrical specs; SC79 package with different marking (E7902 vs. 02V), same die and process | No functional difference - alternate marking used for traceability or customer-specific coding | Select based on BOM revision control or distributor stock availability |
| BB669 | Lower capacitance range (42–5.5 pF), CT1/CT28 = 17.5, rS = 1.0 Ω (typ.) - narrower tuning range and higher loss | Suitable for UHF-focused or lower-Q tuner stages where bandwidth is less constrained | Prefer BB689 E7902 when full VHF coverage and minimal insertion loss are required |
Compared with BB669 and BB689-02V, BB689 E7902 offers the highest capacitance ratio and lowest series resistance in the BB6xx family, making it optimal for wideband, high-selectivity VHF tuner designs where C-V linearity and thermal stability are critical.
Availability
BB689 E7902 is available at Aetrix Electronics and suitable for analog TV tuners, CATV set-top boxes, VHF radio transceivers, and FM broadcast receivers requiring stable component supply and tight parametric consistency across production volumes.
Supply support for BB689 E7902 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 leadership in high-reliability discrete components for industrial and broadcast applications.
BB689 E7902 belongs to Infineon's BB6xx silicon tuning diode product line, engineered specifically for analog VHF frequency synthesis and broadcast receiver tuning - emphasizing capacitance matching, low-loss RF performance, and thermal robustness.
FAQ
What is the maximum reverse voltage rating for BB689 E7902?
The absolute maximum reverse voltage (VR) is 30 V at TA = 25°C, with a peak reverse voltage (VRM) of 35 V when series resistance is ≤5 kΩ. Exceeding 30 V DC continuously risks irreversible junction degradation, especially above 85°C ambient.
Does BB689 E7902 require a specific PCB pad layout?
Yes - the SC79 package requires a footprint matching Infineon's recommended dimensions: 1.3 mm × 0.7 mm pad length/width, 0.2 mm pitch, and cathode-side solder mask opening aligned to the laser-marked cathode bar. Thermal relief vias under the cathode pad improve RF grounding.
How does capacitance matching work across multiple BB689 E7902 units?
Infineon uses an "in-line" matching assembly procedure where up to seven diodes are selected from the same wafer batch and sorted to ensure ∆CT/CT ≤ 2 % over 1–28 V. This is verified per Application Note AN047 and applies only to units marked with matched lot codes.
Can BB689 E7902 be used in SMT reflow processes?
Yes - the SC79 package is qualified for standard lead-free reflow profiles (J-STD-020), with peak temperature up to 260°C for ≤10 seconds. Preheating above 150°C must be limited to <120 seconds to prevent die attach degradation and capacitance shift.
BB 689 E7902 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
BB 689 E7902 FAQ
1.How can I place an order for BB 689 E7902 through Aetrix?
Please submit a Request for Quotation (RFQ) for BB 689 E7902 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 BB 689 E7902 reliable?
The price and inventory of BB 689 E7902 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BB 689 E7902 is usually 5 days.
3.What payment methods are accepted for BB 689 E7902?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BB 689 E7902 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BB 689 E7902?
BB 689 E7902 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BB 689 E7902 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 BB 689 E7902?
For technical support, including BB 689 E7902 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BB 689 E7902 requirements.
6.How does Aetrix verify that BB 689 E7902 is sourced from the original manufacturer or authorized distributors?
All BB 689 E7902 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 BB 689 E7902 meets industry standards.
7.What is the process for return or replacement of BB 689 E7902?
All BB 689 E7902 units undergo pre-shipment inspection (PSI). If there is an issue with BB 689 E7902, 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 BB 689 E7902 part is unused and in its original packaging.
Return procedure for BB 689 E7902:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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