BB182 Planar Variable Capacitance Diode

Overview

The BB182 is a high-performance planar technology variable capacitance diode designed for applications requiring precise capacitance tuning. Packaged in an ultra-small SOD523 (SC-79) surface-mount device (SMD) package, this component offers excellent linearity and matching characteristics, making it ideal for RF and tuning circuits where space and performance are critical.

Features

• High Linearity: Ensures consistent performance across a wide range of operating conditions.
• Excellent Matching (2% DMA): Provides tight capacitance matching for paired or arrayed applications.
• Ultra-Small Plastic SMD Package (SOD523/SC-79): Enables high-density PCB designs and saves board space.
• Capacitance Characteristics: C28 = 2.7 pF with a capacitance ratio of 22, offering a wide tuning range.
• Low Series Resistance: Minimizes losses and improves overall circuit efficiency.

Applications

The BB182 is suitable for a variety of applications where variable capacitance is required, including:

• RF Tuning Circuits: Used in voltage-controlled oscillators (VCOs), filters, and phase-locked loops (PLLs).
• Frequency Modulation: Provides precise capacitance adjustment for FM applications.
• Automatic Frequency Control (AFC): Ensures stable frequency operation in communication systems.
• Impedance Matching Networks: Helps optimize power transfer in RF and microwave circuits.
• Portable and Miniaturized Electronics: Ideal for smartphones, IoT devices, and wearables due to its compact size.

Electrical Characteristics

Absolute Maximum Ratings

• Reverse Voltage (V_R): 30 V
• Power Dissipation (P_tot): 150 mW
• Operating Temperature Range (T_op): -55°C to +150°C
• Storage Temperature Range (T_stg): -55°C to +150°C

Typical Electrical Parameters (T_A = 25°C unless otherwise specified)

• Capacitance at V_R = 28 V (C₂₈): 2.7 pF (typical)
• Capacitance Ratio (C₁/C₂₈): 22 (typical)
• Series Resistance (R_S): 0.8 Ω (typical at f = 1 MHz, V_R = 0 V)
• Quality Factor (Q): 200 (minimum at f = 1 MHz, V_R = 0 V)
• Breakdown Voltage (V_BR): 30 V (minimum)

Package Information

SOD523 (SC-79) Package Dimensions

• Package Type: SOD523 (SC-79), ultra-small SMD plastic package
• Dimensions: 1.2 mm x 0.8 mm x 0.6 mm (L x W x H)
• Termination: Solderable surface-mount terminals
• Weight: Approximately 1 mg

Recommended PCB Footprint

For optimal performance, the following PCB footprint is recommended:

• Pad Dimensions: 0.6 mm x 0.8 mm (rectangular pads)
• Pad Spacing: 0.6 mm (center-to-center)
• Solder Paste: Use a minimal amount to avoid bridging due to the small package size.

Handling and Storage Guidelines

To ensure reliability and longevity of the BB182, adhere to the following handling and storage recommendations:

• ESD Precautions: Handle with appropriate ESD protection to prevent damage from static discharge.
• Moisture Sensitivity: The device is rated MSL1 (unlimited floor life at ≤30°C/85% RH). Store in a dry environment if long-term storage is required.
• Reflow Soldering: Follow JEDEC J-STD-020 profiles for lead-free soldering processes.

Reliability and Compliance

The BB182 meets industry standards for reliability and environmental compliance, including:

• RoHS Compliance: Fully compliant with Directive 2011/65/EU.
• Halogen-Free: Meets IEC 61249-2-21 requirements.
• Reliability Testing: Qualified through standard JEDEC stress tests, including temperature cycling and humidity exposure.

Conclusion

The BB182 variable capacitance diode is a high-performance component designed for applications requiring precise capacitance tuning in a compact form factor. With its excellent linearity, low series resistance, and ultra-small SOD523 package, it is well-suited for modern RF and portable electronics. Its robust electrical characteristics and reliability make it a preferred choice for engineers working on high-frequency and space-constrained designs.