onsemi MURB1660CTT4G Ultrafast Rectifier: Datasheet, Application Circuit, and Replacement Guide

The onsemi MURB1660CTT4G is a high-performance, ultrafast rectifier designed for demanding power conversion applications. Housed in a compact D2PAK (TO-263) surface-mount package, this rectifier is engineered to deliver exceptional efficiency, reliability, and thermal performance in circuits where switching speed and low losses are critical.

Datasheet Overview and Key Specifications

The rectifier is built on a diffused junction process, featuring ultrafast recovery time which is crucial for minimizing switching losses and reducing noise in high-frequency circuits. Its key electrical characteristics include:

Repetitive Peak Reverse Voltage (VRRM): 600 V

Average Forward Current (IF(AV)): 16 A

Peak Forward Surge Current (IFSM): 150 A

Forward Voltage Drop (VF): Typically 1.25 V at 8 A

Reverse Recovery Time (trr): A maximum of 60 ns, which is a defining feature for its ultrafast performance.

The device is qualified for industrial and automotive applications, ensuring high reliability and performance over a wide temperature range from -55°C to +150°C. Its low thermal resistance and large package size make it highly effective at dissipating heat when mounted on a PCB.

Typical Application Circuits

The primary function of the MURB1660CTT4G is to serve as a output rectifier in switched-mode power supplies (SMPS), inverters, and freewheeling diodes in power factor correction (PFC) circuits. Its fast recovery特性 is essential in these high-frequency environments to improve overall efficiency and prevent reverse recovery current from causing excessive stress on switching components like MOSFETs or IGBTs.

A common application is in the output stage of a flyback or forward converter. Here, the rectifier converts the high-frequency AC output from the transformer secondary into a usable DC voltage. Its fast switching capability ensures that the diode turns off quickly before the reverse voltage becomes significant, drastically reducing power loss and electromagnetic interference (EMI).

Replacement and Cross-Reference Guide

When a direct replacement for the MURB1660CTT4G is needed, it is vital to match key parameters to ensure system integrity and performance. Suitable replacements must share the same:

Package Type (D2PAK/TO-263)

Voltage Rating (600 V)

Current Rating (16 A)

Ultrafast Recovery特性 (sub-100 ns trr)

Potential direct or near-equivalent replacements could include diodes from other major manufacturers, such as:

Vishay’s UF16H series

STMicroelectronics’ STTH16R06 series (though verification of package and pinout is always required)

It is strongly recommended to consult the latest datasheets to confirm electrical characteristics, mechanical dimensions, and thermal properties before substitution.

ICGOODFIND: The onsemi MURB1660CTT4G stands out as a robust and efficient solution for high-voltage, high-frequency rectification. Its excellent balance of low forward voltage, ultrafast switching, and superior thermal characteristics makes it a preferred choice for designers of industrial power systems, motor drives, and automotive electronics. When selecting a replacement, meticulous attention to its key specs is paramount for maintaining system reliability.

Keywords: Ultrafast Rectifier, Switched-Mode Power Supply (SMPS), Reverse Recovery Time, Output Rectifier, D2PAK Package.