onsemi MBRS2H100T3G Schottky Barrier Rectifier: Datasheet, Application Circuit, and Replacement Guide
The onsemi MBRS2H100T3G is a high-performance Schottky barrier rectifier designed for high-efficiency power conversion applications. Schottky diodes are renowned for their low forward voltage drop and fast switching capabilities, making them ideal for high-frequency circuits where minimizing power loss and heat generation is critical. This particular device is part of a series offering excellent reliability and is commonly used in switch-mode power supplies (SMPS), reverse polarity protection, and freewheeling diodes.
Datasheet Overview and Key Specifications
A thorough review of the datasheet reveals the core electrical characteristics that define this component's performance. The "2H100" in the part number indicates its dual-diode common-cathode configuration and a voltage rating of 100V.
Repetitive Peak Reverse Voltage (VRRM): 100 V. This is the maximum reverse-bias voltage the diode can withstand repeatedly.
Average Forward Rectified Current (IO): 2 x 1 A per diode. This is the maximum average current each anode can conduct.
Forward Voltage Drop (VF): Typically 0.55 V at 0.5 A per diode. This exceptionally low value is a hallmark of Schottky technology, leading to higher efficiency and less thermal stress compared to standard PN junction diodes.
Reverse Leakage Current (IR): This is specified at a specific reverse voltage and junction temperature (e.g., 0.5 mA at 100V and 25°C). It is a critical parameter for evaluating blocking performance.
Operating Junction Temperature (TJ): Ranges from -65°C to +150°C, ensuring robust performance in a wide array of environments.
Typical Application Circuit
A primary application for the MBRS2H100T3G is as an output rectifier in a DC-DC buck converter. In this circuit, the diode serves as the freewheeling (or flyback) component. When the high-side switch (e.g., a MOSFET) turns off, the inductor's current continues to flow through the Schottky diode, completing the circuit and maintaining a continuous current to the load. The low VF of the MBRS2H100T3G minimizes the voltage drop during this phase, directly increasing the converter's overall efficiency. Its fast recovery time prevents significant reverse recovery current spikes, further reducing switching losses and electromagnetic interference (EMI).
Replacement and Cross-Reference Guide
When the MBRS2H100T3G is unavailable, selecting a suitable replacement requires careful consideration of key parameters to ensure system integrity.
1. Voltage Rating (VRRM): The replacement must have a VRRM of at least 100V. A higher voltage rating (e.g., 120V or 150V) is acceptable and can provide a safety margin, though it may slightly impact forward voltage.
2. Current Rating (IO): The new diode should have an average forward current rating of 1A per diode. Using a higher current-rated part (e.g., 2A or 3A) often improves thermal performance and reliability.
3. Forward Voltage (VF): Choose a replacement with a similarly low VF to maintain system efficiency. A higher VF will result in increased power dissipation.
4. Package Compatibility: The MBRS2H100T3G comes in a compact Dual Surface Mount DPAK (TO-252) package. The physical footprint and pinout (common-cathode) of the replacement must be identical for a drop-in fit.
5. Potential Replacements: Direct or near-direct equivalents can be found from manufacturers like Vishay (e.g., part of the SS2H series), Diodes Incorporated, or STMicroelectronics. Always consult and compare the latest datasheets before finalizing a substitution.
ICGOODFIND: The onsemi MBRS2H100T3G stands out as a highly efficient and reliable dual Schottky rectifier. Its optimal blend of a low 0.55V forward voltage, a 100V reverse voltage rating, and a compact surface-mount package makes it an excellent choice for modern power management designs. When sourcing or replacing this component, prioritizing the electrical specs over the part number alone is crucial for maintaining the intended performance and longevity of the end application.
Keywords: Schottky Barrier Rectifier, Low Forward Voltage, Fast Switching, Output Rectifier, Replacement Guide.
