The MUR3040PT 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. Engineered specifically for high-efficiency, medium-to-high voltage switch-mode power conversion, the MUR3040PT features a repetitive peak reverse voltage rating of 400V, 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 60ns. It is widely used in high-frequency switch-mode power supplies (SMPS), solar inverters, DC-DC step-down/boost converters, high-power battery chargers, and inductive freewheeling clamp circuits.

Specifications

• Brand / Manufacturer: ON Semiconductor / Fairchild / Vishay / Industry Standard
• Part Number / Marking: MUR3040PT / U3040PT
• Diode Configuration: Dual Common Cathode (Center Tap)
• Maximum Repetitive Peak Reverse Voltage (V_RRM): 400V
• Working Peak Reverse Voltage (V_RWM): 400V
• Maximum DC Blocking Voltage (V_R): 400V
• 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): 150A to 200A (8.3ms half sine-wave per leg)
• Maximum Instantaneous Forward Voltage (V_F): 1.25V (at I_F = 15A, T_C = 25°C) / 1.12V (at I_F = 15A, T_C = 150°C)
• Maximum Reverse Recovery Time (t_rr): 60ns (at I_F = 1.0A, di/dt = 50A/µs)
• Maximum Reverse Leakage Current (I_R): 10µA @ T_J = 25°C / 1.0mA @ 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 / SOT-93 (TO-218) (Pin 1: Anode 1, Pin 2: Common Cathode / Tab, Pin 3: Anode 2)

Features

• Ultra-Fast 60ns Switching Speed: Substantially reduces reverse recovery losses and high-frequency switching noise in fast PWM power converters.
• Optimized 400V Blocking Voltage: Ideal voltage rating for intermediate-voltage offline power supplies and secondary bridge rectification.
• Dual Center-Tap Configuration: Combines two matched 15A diode legs with a shared cathode to simplify full-wave secondary rectification circuits and reduce component count.
• High Junction Operating Temperature (175°C): Delivers excellent thermal stability, reliability, and safe operating margins in elevated ambient temperature enclosures.
• High-Temperature Glass Passivated Junction: Ensures minimal reverse leakage and robust avalanche withstand capability over long operating lifetimes.
• High-Thermal TO-247 Package: Large copper baseplate provides direct heatsink mounting for superior thermal management under heavy continuous current loads.

Common Applications

• Switch-Mode Power Supplies (SMPS): High-frequency center-tap output rectification in telecom power supplies, server units, and ATX power supplies.
• Solar Inverters & UPS Systems: Secondary high-frequency output rectification and energy recycling in renewable energy systems.
• High-Power DC-DC Converters: Catch/freewheeling diode stages in industrial buck, boost, and bridge topologies.
• Industrial Battery Chargers: Fast rectification stages in multi-stage lead-acid and lithium battery charging equipment.
• Inductive Load Clamping: High-speed freewheeling protection across inductive motors, large solenoids, and magnetic actuators.

Usage Tips

• Heatsinking Requirement: Always fasten the TO-247 package to an adequately dimensioned aluminum heatsink with thermal paste. If the heatsink is electrically grounded, use a silicone/mica insulation sheet and shoulder washer (as Pin 2 and the mounting tab are tied to the Common Cathode).
• Single 30A Diode Configuration: To utilize the full 30A continuous capacity in a single-phase circuit, connect Pin 1 (Anode 1) and Pin 3 (Anode 2) together in parallel on the PCB.
• RC Snubber Protection: Place a small RC snubber network across each diode leg to absorb high-frequency voltage spikes and ringing caused by transformer leakage inductance.
• PCB Trace Optimization: Keep high-current loops between the transformer secondary, the diode legs, and the output filter capacitors short and wide to minimize parasitic inductance and EMI.

Datasheet