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NXP Semiconductors BB145,115
- Part No.:
- BB145,115
- Manufacturer:
- NXP Semiconductors
- Package:
- SC-79, SOD-523
- Datasheet:
-
BB145,115.pdf
- Description:
- DIODE VAR CAP 6V SOD-523
- Quantity:
- Payment:
- Shipping:
Inventory:2,983
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Product details
Overview
BB145,115 from NXP Semiconductors (formerly Philips) is a planar silicon variable capacitance diode (varactor) in SOD523 (SC-79) package, designed for tuning voltage-controlled oscillators. It delivers 6.4–7.4 pF capacitance at 1 V reverse bias, 2.75–3.25 pF at 4 V, with a typical capacitance ratio of 2.0 and series resistance ≤0.6 Ω at 470 MHz.
For engineers reviewing the BB145,115 datasheet, BB145,115 pinout, BB145,115 application, or BB145,115 equivalent, key selection criteria include reverse voltage rating (6 V continuous), low Rs for high-Q VCO tanks, stable C-V slope across 1–4 V, and ultra-compact SMD footprint for RF front-end miniaturization.
Technical Context
The BB145,115 operates as a reverse-biased junction capacitor whose depletion width-and thus capacitance-varies nonlinearly with applied DC tuning voltage. Its planar structure ensures reproducible C-V characteristics and low leakage (≤10 nA at VR = 6 V, 25 °C).
Designed specifically for VCO frequency tuning, it exhibits a temperature coefficient of capacitance (TCd) ranging from −100 to −300 K⁻¹ depending on reverse voltage, and maintains stable operation from −55 °C to +150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Capacitance @ 1 V | 6.4–7.4 pF - sets nominal VCO tank resonance at low tuning voltage |
| Capacitance @ 4 V | 2.75–3.25 pF - defines maximum tuning range endpoint |
| Capacitance Ratio C₁ᵥ/C₄ᵥ | 2.0 (typ.) - determines achievable frequency tuning bandwidth |
| Series Resistance Rs | ≤0.6 Ω @ 470 MHz - minimizes tank Q degradation and phase noise |
| Max Reverse Voltage VR | 6 V continuous - limits tuning voltage headroom in low-voltage VCO designs |
| Reverse Leakage IR | ≤10 nA @ 6 V, 25 °C - ensures stable bias point and low drift in precision oscillators |
| Package | SOD523 (SC-79) - 1.3 × 0.7 × 0.5 mm footprint for space-constrained RF modules |
Pinout & Package
BB145,115 is housed in a plastic surface-mount SOD523 (SC-79) package with two leads; cathode is marked by a bar on the component body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode | Connected to RF ground or fixed potential; polarity must be observed to avoid forward conduction |
| 2 | Anode | DC tuning voltage input node; AC-coupled to oscillator tank via blocking capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SMD package | SOD523 footprint (1.3 × 0.7 mm) enables integration into miniature VCO modules and Bluetooth/WiFi RFIC front-ends |
| Low series resistance | Rs ≤ 0.6 Ω preserves tank Q-factor >100 at UHF frequencies, directly reducing VCO phase noise |
| Controlled C-V slope | Capacitance ratio of 2.0 over 1–4 V supports linearized frequency vs. voltage tuning with simple DAC or potentiometer |
| Low leakage current | IR ≤ 10 nA at 6 V prevents tuning voltage droop and long-term frequency drift in battery-powered systems |
Applications
| Wireless Transceiver VCOs | FM Radio Tuning Circuits |
|---|---|
Use Scenario: Frequency synthesis in 2.4 GHz ISM-band transceivers requiring compact, low-phase-noise local oscillators. IC Role / Device Role / Timing Role: Varactor diode providing voltage-variable reactance in Colpitts or Clapp oscillator tank. Use Value: Low Rs and tight C-V tolerance enable <−110 dBc/Hz phase noise at 1 MHz offset while fitting within 2.0 × 2.0 mm module area. |
Use Scenario: Analog FM radio receiver front-end with mechanical tuner replacement. IC Role / Device Role / Timing Role: Tuning element in LC resonator for 87–108 MHz band selection. Use Value: 2.0:1 capacitance ratio over 1–4 V allows full-band coverage using single 5 V supply and 10-bit DAC. |
| Test Equipment Sweep Oscillators | Automotive Keyless Entry Transmitters |
Use Scenario: Lab-grade signal generators requiring repeatable, wide-range frequency sweeps. IC Role / Device Role / Timing Role: Primary tuning diode in YIG-less broadband VCO core. Use Value: Stable C-V curve and −55 °C to +150 °C operation support calibration traceability across environmental chambers. |
Use Scenario: 315/433 MHz remote keyless entry (RKE) transmitter with low-cost, small-form-factor PCB. IC Role / Device Role / Timing Role: Frequency-pulling element in SAW-less oscillator architecture. Use Value: SOD523 size and 6 V VR rating allow direct integration with 3.3 V microcontroller GPIO without level-shifting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar varactor diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BBY40,115 | Higher C₁ᵥ (12–15 pF), lower C-ratio (1.7), Rs ≈ 1.2 Ω | Better suited for lower-frequency VCOs (<500 MHz); higher capacitance eases matching but increases tuning sensitivity | Select when wider absolute capacitance range is needed at sub-GHz frequencies and Rs penalty is acceptable |
| SMV1232-011 | C₁ᵥ = 2.5–3.1 pF, C-ratio = 3.5, Rs = 0.4 Ω, 0402 package | Optimized for 1–3 GHz; smaller C range but steeper C-V slope and lower Rs improve high-frequency Q | Prefer for 2.4 GHz+ applications where layout parasitics dominate and tighter Rs control is critical |
Compared with BBY40,115 and SMV1232-011, the BB145,115 offers balanced C-range, ratio, and Rs for general-purpose UHF VCOs in space-constrained designs-neither maximizing low-end capacitance nor high-frequency Q, but delivering consistent performance across 400–900 MHz bands with proven thermal stability.
Availability
BB145,115 is available at Aetrix Electronics and suitable for wireless transceiver VCOs, FM radio tuning circuits, and automotive keyless entry transmitters requiring stable component supply and long-lifecycle support.
Supply support for BB145,115 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
NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications.
The BB145,115 belongs to NXP's legacy RF discrete portfolio, developed to provide reliable, high-yield varactor diodes for analog-tuned oscillators in cost-sensitive consumer and automotive RF systems.
FAQ
What is the maximum reverse voltage rating for BB145,115?
The BB145,115 has a continuous reverse voltage rating of 6 V and a peak reverse voltage of 8 V when used in series with a 10 kΩ resistor. Exceeding 6 V continuously risks junction breakdown and permanent capacitance shift; design margin should maintain VR ≤ 5.5 V in production circuits using BB145,115.
Does BB145,115 support operation at elevated temperatures?
Yes, BB145,115 is rated for junction temperatures from −55 °C to +150 °C. Reverse leakage remains ≤200 nA at 85 °C and 6 V, and its capacitance temperature coefficient is characterized across this range-making BB145,115 suitable for under-hood automotive or industrial environments where thermal stability is critical.
How is the cathode identified on BB145,115?
The cathode of BB145,115 is marked by a bar on the top surface of the SOD523 package, aligned with pin 1. The anode is pin 2, opposite the bar. Correct orientation is essential: reverse biasing requires cathode connection to higher potential than anode-misorientation causes forward conduction and destroys tuning function in BB145,115.
What is the typical capacitance ratio of BB145,115 and how is it measured?
The BB145,115 has a typical capacitance ratio of 2.0, defined as Cd(1 V)/Cd(4 V) measured at 1 MHz. This ratio reflects usable tuning range in VCO designs; actual circuit ratio may vary slightly due to stray capacitance, but BB145,115's specified 2.0 provides predictable frequency span across its 1–4 V tuning range.
Can BB145,115 be used in place of BB139 or BB204?
No-BB145,115 is not a drop-in replacement for BB139 (SOD323, C₁ᵥ ≈ 10 pF) or BB204 (SOT23, C₁ᵥ ≈ 28 pF). These differ in capacitance range, package, and Rs. Substituting BB145,115 would require retuning tank inductors and verifying phase noise; only BB145,115's specific C-V curve and SOD523 footprint are validated for its intended use cases.
BB145,115 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- SC-79, SOD-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Capacitance @ Vr, F:
- 3.25pF @ 4V, 1MHz
- Capacitance Ratio:
- 2.0
- Capacitance Ratio Condition:
- C1/C4
- Voltage - Peak Reverse (Max):
- 6 V
- Diode Type:
- Single
- Q @ Vr, F:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
BB145,115 FAQ
1.How can I place an order for BB145,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for BB145,115 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 BB145,115 reliable?
The price and inventory of BB145,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BB145,115 is usually 5 days.
3.What payment methods are accepted for BB145,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BB145,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BB145,115?
BB145,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BB145,115 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 BB145,115?
For technical support, including BB145,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BB145,115 requirements.
6.How does Aetrix verify that BB145,115 is sourced from the original manufacturer or authorized distributors?
All BB145,115 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 BB145,115 meets industry standards.
7.What is the process for return or replacement of BB145,115?
All BB145,115 units undergo pre-shipment inspection (PSI). If there is an issue with BB145,115, 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 BB145,115 part is unused and in its original packaging.
Return procedure for BB145,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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