BAT120 - Planar Schottky Barrier Double Diodes

Overview

The BAT120 is a high-performance planar Schottky barrier double diode encapsulated in a SOT223 plastic surface-mount device (SMD) package. Designed for applications requiring low switching losses and high surge current capability, this component is ideal for power management, rectification, and high-frequency circuits. Its compact SOT223 package ensures efficient thermal performance while maintaining a small footprint on PCBs.

Features

• Low Switching Losses: Optimized for high-speed switching applications, reducing energy dissipation.
• High Surge Current Capability: Capable of absorbing very high transient currents, making it suitable for rugged environments.
• Double Diode Configuration: Two Schottky diodes in a single package, saving board space and simplifying design.
• SOT223 Package: Plastic SMD package with excellent thermal and electrical performance.
• Low Forward Voltage Drop: Enhances efficiency in power conversion applications.
• High Temperature Stability: Reliable operation across a wide temperature range.

Applications

The BAT120 is versatile and finds use in a variety of electronic circuits, including:

• Power Supplies: Used in DC-DC converters, switch-mode power supplies (SMPS), and voltage regulation circuits.
• Rectification: Efficiently converts AC to DC in low-voltage, high-frequency applications.
• Reverse Polarity Protection: Safeguards sensitive circuits from damage due to incorrect power supply connections.
• Freewheeling Diodes: Protects inductive loads by providing a path for current decay when the load is switched off.
• High-Frequency Circuits: Suitable for RF and signal demodulation due to fast switching characteristics.

Electrical Characteristics

The following table summarizes the key electrical parameters of the BAT120 under typical operating conditions (25°C unless otherwise specified):

Absolute Maximum Ratings

• Repetitive Peak Reverse Voltage (V_RRM): 20V
• Average Forward Current (I_F(AV)): 1A per diode
• Non-Repetitive Peak Forward Surge Current (I_FSM): 30A (t_p = 1s)
• Operating Junction Temperature (T_j): -55°C to +125°C
• Storage Temperature (T_stg): -55°C to +150°C

Forward Characteristics

• Forward Voltage Drop (V_F): 0.45V (typical) at I_F = 1A
• Dynamic Resistance (r_F): 0.25Ω (typical) at I_F = 1A

Reverse Characteristics

• Reverse Leakage Current (I_R): 0.5mA (maximum) at V_R = 20V, T_j = 25°C
• Junction Capacitance (C_j): 50pF (typical) at V_R = 0V, f = 1MHz

Package Information

The BAT120 is housed in a SOT223 surface-mount package, which provides a balance between compact size and thermal performance. Below are the key mechanical details:

Package Dimensions

• Package Type: SOT223 (Small Outline Transistor)
• Lead Count: 4 (with one common pin)
• Dimensions (L x W x H): 6.5mm x 3.5mm x 1.8mm (typical)
• Lead Pitch: 2.3mm (between adjacent leads)
• Mounting Style: Surface-mount (SMD)

Pin Configuration

The pinout for the BAT120 is as follows:

• Pin 1 (A): Anode of Diode 1
• Pin 2 (C): Common Cathode (shared by both diodes)
• Pin 3 (S): Anode of Diode 2
• Pin 4 (Tab): Thermal pad (connected to the common cathode for heat dissipation)

Thermal Performance

• Thermal Resistance (Junction-to-Ambient, R_θJA): 75°C/W (typical)
• Thermal Resistance (Junction-to-Lead, R_θJL): 25°C/W (typical)

Conclusion

The BAT120 planar Schottky barrier double diode is a robust and efficient solution for applications requiring fast switching, low forward voltage drop, and high surge current handling. Its SOT223 package offers excellent thermal management and space-saving benefits, making it suitable for modern compact electronic designs. Whether used in power supplies, rectification circuits, or protection mechanisms, the BAT120 delivers reliable performance under demanding conditions.