The MUR3020PT is a dual-chip, center-tap ultra-fast recovery power rectifier diode housed in a heavy-duty TO-247 (TO-218 / TO-3P compatible) through-hole package. Specifically designed for low-voltage, high-frequency switch-mode power conversion, the MUR3020PT features a repetitive peak reverse voltage rating of 200V, a total continuous forward current capacity of 30A (15A per diode leg), low forward voltage drop, and an ultra-fast reverse recovery time (t_rr) of 35ns. It is widely used in high-efficiency switch-mode power supplies (SMPS), low-voltage solar inverters, battery chargers, DC-DC step-down converters, and freewheeling diode circuits.

Specifications

• Brand / Manufacturer: ON Semiconductor / Vishay / Industry Standard
• Part Number / Marking: MUR3020PT / U3020
• Diode Configuration: Dual Common Cathode (Center Tap)
• Maximum Repetitive Peak Reverse Voltage (V_RRM): 200V
• Working Peak Reverse Voltage (V_RWM): 200V
• Maximum DC Blocking Voltage (V_R): 200V
• Average Rectified Forward Current (I_F(AV)): 30A Total (15A per Diode Leg at T_C = 150°C)
• Non-Repetitive Peak Forward Surge Current (I_FSM): 200A (8.3ms half sine-wave per leg)
• Maximum Instantaneous Forward Voltage (V_F): 1.05V (at I_F = 15A, T_C = 25°C) / 0.85V (at I_F = 15A, T_C = 150°C)
• Maximum Reverse Recovery Time (t_rr): 35ns (at I_F = 1.0A, di/dt = 50A/µs)
• Maximum Reverse Leakage Current (I_R): 10µA @ T_J = 25°C / 500µA @ T_J = 150°C
• Operating Junction & Storage Temperature Range: -65°C to +175°C
• Thermal Resistance, Junction-to-Case (R_θJC): 1.5°C/W per diode leg
• Package / Case: TO-247 / TO-218AC (Pin 1: Anode 1, Pin 2: Common Cathode / Tab, Pin 3: Anode 2)

Features

• Ultra-Fast 35ns Switching Speed: Dramatically reduces switching and diode reverse-recovery losses during high-frequency PWM operation up to hundreds of kilohertz.
• Low Forward Voltage Drop (0.85V at 150°C): Minimizes conduction power loss and reduces thermal stress under high continuous output currents.
• Dual Common Cathode Design: Integrates two matched 15A diodes sharing a common center cathode to simplify secondary full-wave center-tapped rectification.
• High Junction Temperature Rating (175°C): Delivers robust thermal stability and reliability under demanding high-power industrial operating conditions.
• Glass Passivated High-Temperature Junction: Ensures low reverse leakage current and superior avalanche withstand characteristics over time.
• Heavy-Duty Power Package: TO-247/TO-218 casing provides direct heatsink mounting for efficient heat dissipation in high-wattage power supplies.

Common Applications

• High-Efficiency SMPS Secondary Rectification: Secondary output rectification in 12V, 24V, and 48V ATX power supplies, server supplies, and industrial DC units.
• Low-Voltage Solar Inverters & UPS Systems: High-frequency output rectification and energy recovery in renewable power systems.
• Fast Battery Chargers: High-current AC-DC rectification stages for lithium-ion and lead-acid battery fast charging systems.
• DC-DC Buck & Boost Converters: Fast freewheeling catch diode in step-down and step-up switching regulator modules.
• Motor Drives & Solenoid Clamping: Freewheeling suppression across inductive coils, brushed DC motors, and actuators.

Usage Tips

• Thermal Heatsink Attachment: Always mount the tab securely to an adequately sized aluminum heatsink using thermal grease; use an insulating silicone/mica pad and bushing if the heatsink must remain electrically isolated from the center Cathode.
• Parallel Leg Operation: If using as a single-channel diode for up to 30A continuous current, tie Pin 1 (Anode 1) and Pin 3 (Anode 2) together on the PCB.
• Voltage Margin & Derating: For long-term reliability in high-speed switching circuits, operate within 50% to 60% of the 200V peak reverse voltage rating to protect against inductive turn-off voltage spikes.
• PCB Trace Layout: Keep loop areas between the transformer secondary winding, the MUR3020PT leads, and the output smoothing capacitors minimal to reduce stray inductance and parasitic ringing.

Datasheet