BF988 - N-Channel Dual Gate MOSFET

Overview

The BF988 is a high-performance N-channel dual gate MOSFET designed for RF and microwave applications. This component features integrated gate protection diodes, excellent cross-modulation performance, and low noise characteristics, making it ideal for use in amplifiers, mixers, and other high-frequency circuits. The BF988 is housed in a TO-50 plastic package, ensuring robust performance in a variety of environmental conditions.

Features

• Integrated gate protection diodes – Enhances reliability by protecting the gate from voltage spikes.
• High cross-modulation performance – Reduces interference in RF applications, ensuring clean signal transmission.
• Low noise figure – Minimizes signal degradation, making it suitable for sensitive receiver circuits.
• High gain – Provides significant signal amplification for improved system performance.
• High AGC (Automatic Gain Control) range – Allows for dynamic signal level adjustment in varying conditions.
• Low feedback capacitance – Reduces unwanted coupling between stages, improving stability.
• Low input capacitance – Enhances high-frequency response and reduces loading effects.

Applications

The BF988 is widely used in RF and microwave applications due to its superior performance characteristics. Key applications include:

• RF Amplifiers – Provides high gain and low noise for receiver front-ends.
• Mixers – Delivers excellent cross-modulation performance for frequency conversion.
• Oscillators – Ensures stable operation with low phase noise.
• AGC Circuits – Supports dynamic gain adjustment in communication systems.
• Broadband Amplifiers – Maintains performance across a wide frequency range.

Electrical Characteristics

The following table summarizes the key electrical characteristics of the BF988 under typical operating conditions (unless otherwise specified).

Absolute Maximum Ratings

• Drain-Source Voltage (V_DS): 12 V
• Drain Current (I_D): 30 mA

Note: Exceeding these ratings may cause permanent damage to the device.

Typical Performance Parameters

• Noise Figure (NF): Typically low, ensuring minimal signal degradation.
• Forward Transfer Admittance (|Y_fs|): High, indicating strong gain performance.
• Input Capacitance (C_iss): Low, reducing high-frequency loading effects.
• Feedback Capacitance (C_rss): Low, improving circuit stability.

Package Information

The BF988 is housed in a TO-50 plastic package, which provides mechanical durability and thermal performance. The pin configuration is as follows:

• Pin 1: Drain (D)
• Pin 2: Source (S)
• Pin 3: Gate 1 (G1)
• Pin 4: Gate 2 (G2)

The package is marked with "BF988" for easy identification.

Thermal and Mechanical Specifications

The TO-50 package ensures efficient heat dissipation and mechanical stability. Key specifications include:

• Operating Temperature Range: -55°C to +150°C
• Storage Temperature Range: -65°C to +175°C
• Package Weight: Approximately 0.5 grams

Handling and Storage Recommendations

To ensure optimal performance and longevity of the BF988, adhere to the following guidelines:

• Store in an anti-static bag or container to prevent electrostatic discharge (ESD) damage.
• Avoid exposure to extreme humidity or corrosive environments.
• Use proper soldering techniques to prevent thermal stress during assembly.

Conclusion

The BF988 is a versatile and high-performance N-channel dual gate MOSFET, well-suited for demanding RF and microwave applications. Its combination of low noise, high gain, and robust protection features makes it an excellent choice for engineers designing sensitive and high-frequency circuits. The TO-50 package ensures reliability and ease of integration into various system designs.