Onsemi MURS360T3G Ultrafast Rectifier: Datasheet, Application Circuit, and Replacement Guide
The Onsemi MURS360T3G is a high-efficiency ultrafast rectifier designed for high-frequency power conversion applications. As part of the MURS series, this rectifier is engineered to deliver superior performance in switching power supplies, inverters, and freewheeling diodes, where fast recovery and low losses are critical.
Datasheet Overview
Key parameters from the datasheet define the component's capabilities. The MURS360T3G is a 600 Volt, 3 Amp rectifier housed in a surface-mount DPAK (TO-252) package. Its most significant feature is an ultrafast reverse recovery time (trr) of 35 ns, which minimizes switching losses and reduces noise in high-frequency circuits. The device boasts a low forward voltage drop (VF) of typically 1.25V at 3A, enhancing overall system efficiency. Its soft recovery characteristics help in controlling electromagnetic interference (EMI), making it suitable for noise-sensitive environments.
Typical Application Circuit
A primary application for the MURS360T3G is as a freewheeling or flyback diode in switch-mode power supplies (SMPS) and motor drive circuits. In a typical buck converter or half-bridge configuration, the rectifier is placed across an inductive load (like a motor winding or transformer) to provide a path for the current to circulate when the main switch (e.g., a MOSFET) turns off. This protects the switch from voltage spikes caused by the sudden collapse of the magnetic field.
A simple application circuit involves:
An input DC voltage source.
A PWM controller driving a power MOSFET.
An inductor as the main energy storage element.
The MURS360T3G placed in parallel with the inductor and the MOSFET.
This setup ensures that when the MOSFET switches off, the inductor's current flows through the MURS360T3G, safely dissipating the energy and preventing damage to the active switch.
Replacement and Cross-Reference Guide
When a direct replacement is needed, it is crucial to match key specifications to ensure compatibility and performance.
Direct Replacements: The MURS360T3G is often a drop-in replacement for other standard ultrafast rectifiers in a DPAK package. Key part numbers to cross-reference include the ES3D, UF4004, or FR307, though verifying voltage and current ratings (600V, 3A) and the all-important recovery speed is essential.
Selection Criteria: When choosing a substitute, prioritize:
1. Peak Repetitive Reverse Voltage (VRRM): Must be at least 600V.
2. Average Forward Current (IF(AV)): Must be 3A or higher.
3. Reverse Recovery Time (trr): Should be 50 ns or less to maintain switching efficiency.
4. Package Type: The DPAK (TO-252) footprint is critical for PCB compatibility.
Always consult the respective datasheets to confirm these parameters before substitution.
ICGOODFIND: The Onsemi MURS360T3G stands out as a robust and highly efficient solution for modern power management designs. Its combination of a high voltage rating, ultrafast recovery, and low forward voltage makes it an excellent choice for designers aiming to optimize efficiency and reliability in high-frequency rectification tasks.
Keywords: Ultrafast Rectifier, Reverse Recovery Time, Freewheeling Diode, Switching Power Supply, Cross-Reference.
