Overview
The BB149,135 is a UHF variable capacitance diode, also known as a varactor diode, manufactured by NXP USA Inc. This component is fabricated using planar technology and is encapsulated in a very small SMD plastic package, specifically the SOD323 (SC-76) package. Although the BB149 series is no longer in production, it remains relevant for existing designs and maintenance of older systems.
Key Specifications
| Category | Description |
|---|---|
| Manufacturer | NXP USA Inc. |
| Package / Case | SOD323 (SC-76) |
| Mounting Type | Surface Mount |
| Diode Type | Single |
| Capacitance @ Vr, F | 2.225 pF @ 28V, 1MHz |
| Capacitance Ratio | 10.9 (C1/C28) |
| Voltage - Peak Reverse (Max) | 30 V |
| Operating Temperature | -55°C ~ 125°C (TJ) |
| RoHS Status | Lead free |
| Part Status | Obsolete |
Key Features
- Small Package Size: Encapsulated in the SOD323 (SC-76) package, making it suitable for compact designs.
- Variable Capacitance: The diode provides a capacitance ratio of 10.9, which is useful for tuning and voltage-controlled applications.
- Wide Operating Temperature Range: Operates from -55°C to 125°C, ensuring reliability in various environmental conditions.
- High Peak Reverse Voltage: Can handle up to 30V peak reverse voltage, enhancing its durability in high-voltage applications.
Applications
The BB149,135 UHF variable capacitance diode is typically used in applications requiring voltage-controlled capacitance, such as:
- Tuning Circuits: In radio frequency (RF) circuits, it helps in adjusting the frequency by changing the capacitance.
- Voltage-Controlled Oscillators (VCOs): Used in VCOs to control the frequency based on an input voltage.
- Filter Circuits: In filter designs where the capacitance needs to be adjusted dynamically.
- RF and Microwave Systems: In various RF and microwave applications where variable capacitance is required.
Q & A
- What is the package type of the BB149,135 diode?
The BB149,135 diode is packaged in the SOD323 (SC-76) package. - What is the maximum peak reverse voltage for the BB149,135?
The maximum peak reverse voltage is 30 V. - What is the capacitance ratio of the BB149,135?
The capacitance ratio is 10.9 (C1/C28). - What is the operating temperature range of the BB149,135?
The operating temperature range is -55°C to 125°C (TJ). - Is the BB149,135 RoHS compliant?
Yes, the BB149,135 is lead-free and RoHS compliant. - What are typical applications for the BB149,135?
Typical applications include tuning circuits, voltage-controlled oscillators (VCOs), filter circuits, and RF and microwave systems. - Why is the BB149,135 no longer manufactured?
The BB149 series is no longer in production, but it remains relevant for existing designs and maintenance of older systems. - What is the capacitance value at 28V and 1MHz for the BB149,135?
The capacitance value at 28V and 1MHz is 2.225 pF. - Can the BB149,135 be used in surface mount designs?
Yes, the BB149,135 is designed for surface mount applications. - What is the status of the BB149,135 part?
The BB149,135 is listed as obsolete.
