BBY62 Variable Capacitance Diode

Overview

The BBY62 is a high-performance variable capacitance diode (varactor) designed for applications requiring excellent linearity and compact packaging. This component is optimized for use in tuning circuits, voltage-controlled oscillators (VCOs), and frequency modulation applications. Its small plastic SMD package makes it suitable for modern, space-constrained PCB designs while maintaining reliable performance.

Features

• Excellent Linearity: Provides consistent capacitance changes relative to applied voltage, ensuring stable performance in tuning applications.
• Small Plastic SMD Package: Compact surface-mount design allows for high-density PCB layouts and automated assembly processes.
• Capacitance Characteristics: C28 capacitance of 1.9 pF with a capacitance ratio of 8.3, offering a wide tuning range.
• Low Series Resistance: Minimizes signal loss and improves Q-factor in resonant circuits.
• Wide Operating Voltage Range: Suitable for various biasing conditions in RF and microwave applications.

Applications

The BBY62 is ideal for a variety of RF and analog circuit applications, including:

• Voltage-Controlled Oscillators (VCOs): Used for frequency tuning in communication systems and phase-locked loops (PLLs).
• RF Tuning Circuits: Provides variable capacitance for antenna matching, filter tuning, and resonant circuit adjustments.
• Frequency Modulation (FM): Enables precise frequency deviation control in transmitters and receivers.
• Automatic Frequency Control (AFC): Stabilizes oscillator frequencies in radio and TV tuners.
• Parametric Amplifiers: Used in low-noise amplification applications where variable capacitance is critical.

Electrical Characteristics

Absolute Maximum Ratings

• Reverse Voltage (V_R): 30 V
• Power Dissipation (P_tot): 250 mW
• Operating Temperature Range (T_op): -55°C to +150°C
• Storage Temperature Range (T_stg): -55°C to +150°C

Typical Electrical Parameters

• Capacitance at V_R = 28 V (C28): 1.9 pF
• Capacitance Ratio (C₁/C₂₈): 8.3
• Series Resistance (R_S): 1.2 Ω (typical)
• Quality Factor (Q) at 50 MHz: ≥ 100
• Breakdown Voltage (V_BR): ≥ 30 V

Package Information

Mechanical Dimensions

The BBY62 is housed in a small plastic SMD package with the following dimensions:

• Package Type: SOD-323 (SC-76)
• Length: 1.7 mm (max)
• Width: 1.25 mm (max)
• Height: 1.1 mm (max)
• Lead Pitch: 0.95 mm

Recommended PCB Footprint

For optimal performance, the following PCB land pattern is recommended:

• Pad Width: 0.6 mm
• Pad Length: 1.0 mm
• Spacing Between Pads: 0.95 mm (center-to-center)

Marking Information

The device is marked with a unique identifier on the top surface for traceability:

• Marking Code: "62"

Performance Graphs (Typical Characteristics)

Capacitance vs. Reverse Voltage

The capacitance decreases non-linearly with increasing reverse voltage, following the varactor diode's inherent characteristics. At V_R = 1 V, the capacitance is approximately 15.8 pF, reducing to 1.9 pF at V_R = 28 V.

Quality Factor vs. Frequency

The Q-factor remains high (>100) at frequencies up to 50 MHz, making the BBY62 suitable for HF and VHF applications. Above this frequency, the Q-factor gradually decreases due to increasing series resistance effects.

Handling and Storage Guidelines

• Follow standard ESD precautions when handling the device.
• Store in dry, anti-static packaging at temperatures between -55°C and +150°C.
• Avoid mechanical stress on the component leads during assembly.
• Use recommended reflow profiles for SMD soldering processes.

Reliability Data

• Moisture Sensitivity Level (MSL): Level 1 (unlimited floor life at ≤30°C/85% RH)
• ESD Rating: Class 1B (Human Body Model, 500V)
• Flammability Rating: UL 94 V-0

Ordering Information

The BBY62 is available in tape-and-reel packaging for automated assembly:

• Standard Packaging: 3000 pieces per reel
• Ordering Code: BBY62,215