5PCS SS54 5A 40V SMA SMD DIODE

🔹 5PCS SS54 – 5A 40V Schottky Barrier Rectifier Diode (SMA/DO-214AC)

A high-current, surface-mount Schottky diode with ultra-low forward voltage drop and fast switching characteristics. The SS54 is designed for high-efficiency, low-voltage, high-current rectification and protection in compact power circuits such as DC-DC converters, power supplies, and motor drivers.

✅ Specifications:

• Part Number: SS54

• Type: Schottky Barrier Rectifier Diode

• Max Repetitive Reverse Voltage (VRRM): 40V

• Max Average Forward Rectified Current (IO): 5A

• Peak Forward Surge Current (IFSM): 150A (8.3ms single half-sine wave)

• Forward Voltage (VF): ~0.55V (Typical at 5A) – Key Low-Loss Feature

• Reverse Recovery Time (trr): Negligible (Schottky Characteristic)

• Package: SMA / DO-214AC (Surface Mount)

• Mounting Type: SMD (Surface Mount Device)

• Operating Junction Temperature: -65°C to +150°C

• Marking: SS54 printed on diode body

• Quantity: 5 pieces

⚙️ Key Features:

• Ultra-Low Forward Voltage: Typical 0.55V at 5A (vs. ~1.1V for standard silicon diodes), dramatically reducing conduction losses and heat generation.

• High Current Capability: Robust 5A continuous rating makes it suitable for demanding power applications.

• Very Fast Switching: As a Schottky diode, it has essentially no reverse recovery charge (trr), making it perfect for high-frequency switching circuits (SMPS).

• Compact Powerhouse: The SMA package delivers high current density in a small footprint.

• Efficient & Cool Operation: Lower power dissipation allows for more compact designs with minimal heatsinking.

📦 Typical Applications:

• High-Current DC-DC Converters: As the output rectifier in buck, boost, or buck-boost converters for 5V, 12V, and 24V systems.

• Reverse Polarity Protection: Excellent for high-current battery-powered devices, robotics, and automotive applications due to low voltage drop.

• Freewheeling / Clamping Diodes: In motor drivers, H-bridges, and solenoid/relay circuits to suppress inductive voltage spikes.

• Solar Panel & Battery Controllers: As a blocking diode in high-current charging circuits.

• Power Supply OR-ing: In redundant power supply systems.

🔧 Polarity & Mounting Notes:

• Polarity Identification: On the SMA (DO-214AC) package, the cathode is marked with a white line or stripe on one end of the component body. The body marking “SS54” is typically read from the cathode end.

• PCB Footprint: Requires a standard SMA (DO-214AC) land pattern. Ensure correct orientation.

• Heatsinking is CRITICAL: For full 5A continuous operation, the diode MUST be soldered to a generous PCB copper pad/plane that acts as a heatsink. Inadequate thermal design will cause immediate overheating and failure. Consider using a SMC (DO-214AB) or larger package if board space allows for better thermal performance.

⚠️ Important Design & Safety Notes:

• Thermal Management is Paramount: This is the most critical aspect. The SMA package has limited thermal mass. Use thermal vias to inner layers, large copper pours, and possibly external heatsinking for sustained high current.

• Reverse Leakage: Schottky diodes have higher reverse leakage current than PN junction diodes, especially at high temperatures. This can be significant in precision circuits.

• Voltage Rating: The 40V rating is suitable for most low-voltage power applications (e.g., 12V, 24V systems). For higher voltages, use the SS56 (60V) or SS510 (100V).

• Current Derating: At elevated ambient temperatures, the continuous current rating must be reduced according to the derating curve in the datasheet.

• Not a Zener: This is a rectifier Schottky diode, not for voltage regulation.