Part Number: MBRS120T3G

Manufacturer: onsemi

Description: DIODE SCHOTTKY 20V 1A SMB

Shipped from: Shenzhen/HK Warehouse

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MBRS120T3G Introduction

The MBRS120T3G is a Schottky Barrier diode with great performance in a small package. This diode is made with geometry and building methods that are up-to-date and designed to meet the needs of modern surface-mount applications. In this detailed guide, we’ll talk about the MBRS120T3G’s most important features, uses, and benefits, with a focus on its ability to provide efficient rectification and polarity protection while keeping a small footprint.

MBRS120T3G Key Features

The MBRS120T3G uses the Schottky Barrier principle, which lets it work well in many different situations. Some of the most important things about the MBRS120T3G are:

  • Size: The MBRS120T3G is made to be small, which makes it a great choice for surface-mount applications with limited room. Its small size and low profile help to make the system smaller and lighter as a whole.
  • Low Voltage, High-Frequency Rectification: This diode is great for low voltage rectification, which makes sure that high-frequency circuits convert energy efficiently. Its fast switching speed lets it handle signals quickly, making it perfect for situations where high speed is important.
  • Free-Wheeling and Polarity Protection: The MBRS120T3G works well as a free-wheeling diode, avoiding voltage spikes and making sure current flows smoothly in circuits. It also works well as a polarity safety diode, keeping sensitive parts safe in the event of reverse polarity.

MBRS120T3G Applications

  • The MBRS120T3G is used in many different fields where its small size and steady performance are most important. Some famous applications include:
  • Power Supplies: The MBRS120T3G is often used in power supply systems to turn low-voltage AC signals into DC power. Its low forward voltage drop keeps power losses to a minimum, making it more efficient overall.
  • Switching Regulators: The MBRS120T3G is a good choice for high-frequency switching regulators because it has a fast switching speed and low capacitance. It makes energy exchange more efficient and helps keep the voltage output stable.
  • Automotive Electronics: The MBRS120T3G is good for automotive electronics because it is small and works well. It can be used in lighting systems, audio systems, and control units, among other places.
  • Consumer Electronics: The MBRS120T3G is a great choice for small consumer electronics like smartphones, tablets, and wearable devices. Its small size and effective rectification help the battery last longer and the gadget work better.

Understanding the MBRS120T3G

Working Principle of the Schottky Barrier Diode

The Schottky Barrier Principle is what makes the MBRS120T3G work so well. Schottky Barrier diodes are different from traditional p-n junction diodes, which are made by putting flaws into a semiconductor material to make a junction. Instead, Schottky Barrier diodes are made by putting a metal and a semiconductor together.

The metal-to-semiconductor junction in the MBRS120T3G makes a barrier that lets it switch faster and drop forward power less than other diodes. The Schottky Barrier diode works by taking advantage of the fact that a metal-semiconductor junction acts like a switch, letting current flow easily in one direction while offering a lot of resistance in the other.

Overview of the MBRS120T3G’s Construction

The MBRS120T3G is made with high-tech tools and materials to make it work as well as possible. The most important parts of its building are:

  • Big Area Metal-to-Silicon Power Diode: The MBRS120T3G has a diode structure with a big area, which lets it handle more current. This system makes sure that power flows well and loses the least amount of power possible.
  • Epitaxial Construction: The diode is built using epitaxial construction, which involves growing a layer of semiconductor material on a substrate. This method improves the diode’s performance by lowering the forward voltage drop and increasing the reverse leakage current.
  • Oxide Passivation: The MBRS120T3G incorporates oxide passivation, which involves applying a thin layer of insulating material (oxide) to the semiconductor surface. This passivation layer improves the diode’s total performance by making it more reliable, protecting it from outside contaminants, and reducing surface recombination.
  • Metal Overlay Contact: The diode has a metal overlay contact that connects to the semiconductor material with low resistance. This design feature keeps energy losses to a minimum and makes sure that the current flows well.

How Important Are Design Features?

The design features incorporated in the MBRS120T3G play a crucial role in ensuring its efficient operation and performance.

  • Fast Switching Speed: The Schottky Barrier diode’s metal-to-semiconductor junction enables faster switching speeds, making the MBRS120T3G suitable for high-frequency applications. It allows for quick response times and efficient signal processing.
  • Low Forward Voltage Drop: The large-area metal-to-silicon power diode design, along with the Schottky Barrier principle, results in a lower forward voltage drop compared to conventional diodes. This feature reduces power losses and enhances overall system efficiency.
  • Reduced Reverse Recovery Time: The absence of a depletion region in the Schottky Barrier diode eliminates the reverse recovery time associated with traditional diodes. This characteristic enables faster diode turn-off and reduces switching losses.
  • Enhanced Reliability: The epitaxial construction and oxide passivation contribute to the diode’s improved reliability. They protect the diode from external factors, minimize surface defects, and enhance long-term performance and stability.

By leveraging these design features, the MBRS120T3G offers engineers and designers a highly efficient and reliable solution for rectification, free-wheeling, and polarity protection applications in compact surface-mount systems.

Best Practices and Tips

Consider the following best practices and tips to make sure the MBRS120T3G works well and stays reliable over time:

  • Proper Storage and Handling
  • Keep the diodes somewhere cool and dry, away from direct sunlight and water.
  • Handle the diodes carefully, and don’t use too much force or break the leads.
  • To avoid harm from electrostatic discharge, take the right ESD (electrical Discharge) precautions when handling the diodes. For example, ground yourself and wear an ESD wrist strap.

ESD Protection

  • Use ESD diodes or transient voltage suppressors to protect the MBRS120T3G and other sensitive components from ESD events.
  • To reduce the risk of ESD damage during assembly and installation, use the methods that are standard in the industry.

PCB Layout Considerations

  • Pay attention to the diode’s thermal management by making sure it has enough copper traces or thermal vias to get rid of heat.
  • Keep the connections between the MBRS120T3G and other parts short and straight to reduce parasitic resistance and inductance, which can affect performance.

Application-Specific Considerations

  • Make sure the voltage and current are properly derated so the diode can work within its limits and not be put under too much stress.
  • When choosing a diode for your application, you should think about its forward voltage drop and backward recovery time to make sure it meets your system’s needs.


  • If the diode isn’t working right or isn’t working as intended, check its connections, polarity, and ratings.
  • Make sure the diode isn’t working harder than it should, as this can cause it to break down or fail.
  • By following these best practices, you can get the most out of the MBRS120T3G in terms of speed, reliability, and avoiding common problems when storing, handling, and putting it into your circuit designs.


The MBRS120T3G Schottky Barrier Diode is an important part for low voltage, high-frequency rectification, and surface-mount applications. Because of how well it is designed and how well it works, it is more efficient and runs more reliably.

By using the MBRS120T3G to its full potential, engineers are able to do exact rectification and efficient energy conversion. For the best performance, you should think about thermal management, the right PCB layout, and the right mounting methods. Partner with ICRFQ to get help from experts on how to use the MBRS120T3G successfully. Our knowledge and help will help you build reliable solutions for your systems that take advantage of the diode’s small size and light weight.

Use the MBRS120T3G to its fullest potential and start new projects that require efficient power conversion and a small size.

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