Infineon BAS28W High-Speed Switching Diode Series: Performance Characteristics and Application Circuits
The Infineon BAS28W series represents a family of high-speed switching diodes designed for applications requiring fast switching, low capacitance, and minimal reverse recovery time. These diodes are housed in a small SOT-323 surface-mount package, making them ideal for space-constrained PCBs while delivering robust performance across a wide range of operating conditions.
Key Performance Characteristics
1. High-Speed Switching: The BAS28W diodes exhibit an ultra-fast reverse recovery time (trr ≈ 4 ns), enabling efficient operation in high-frequency circuits. This makes them suitable for RF applications, signal demodulation, and digital logic circuits.
2. Low Capacitance: With a typical junction capacitance (Cj) of just 2 pF at VR = 0 V, these diodes minimize parasitic effects, ensuring signal integrity in high-speed data lines and communication systems.
3. Low Forward Voltage: The diodes feature a forward voltage (VF) of approximately 0.71 V at IF = 10 mA, reducing power loss and improving efficiency in rectification and clamping applications.
4. Dual-Diode Configuration: Each BAS28W package contains two independent diodes, allowing designers to implement compact circuit topologies such as full-wave rectifiers or voltage doublers without additional components.
5. Thermal Stability: Operating reliably across a temperature range of -65 °C to +150 °C, the series is well-suited for automotive, industrial, and consumer electronics.
Application Circuits
1. High-Frequency Rectification: The BAS28W is commonly used in AC-to-DC converters for switching power supplies and signal rectification in communication devices. Its fast recovery time ensures minimal switching losses.
2. Clipping and Clamping Circuits: In audio and video signal processing, the diodes protect sensitive components by limiting voltage spikes or shifting DC levels.
3. Logic Gates and Signal Demodulation: The low capacitance and fast response make the BAS28W ideal for implementing diode-based logic circuits (e.g., AND/OR gates) and AM/FM demodulation in radio receivers.
4. Freewheeling Diodes: In inductive load applications (e.g., relays, motors), the diode suppresses voltage transients by providing a safe discharge path, preventing damage to switching transistors.
The Infineon BAS28W series excels in high-speed switching applications, offering a blend of low capacitance, fast recovery, and thermal robustness. Its dual-diode SOT-323 package enables compact designs without compromising performance, making it a versatile choice for modern electronics.
Keywords:
High-Speed Switching, Low Capacitance, Reverse Recovery Time, SOT-323 Package, Dual Diode
