INDUSTRY COMPONENT

Freewheeling Diode / Synchronous MOSFET

Freewheeling diode or synchronous MOSFET used in buck converters for energy recirculation and efficiency optimization.

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Component Specifications

Definition
In buck converter circuits, the freewheeling diode (or synchronous MOSFET in synchronous designs) provides a path for inductor current during the switch-off period, preventing voltage spikes and enabling continuous current flow. This component is critical for energy recirculation, reducing switching losses, and improving overall converter efficiency.
Working Principle
During the switch-off phase of the buck converter's main switch, the freewheeling diode becomes forward-biased (or the synchronous MOSFET is actively turned on in synchronous designs), allowing inductor current to circulate through the load. This maintains continuous current flow, stores and releases magnetic energy, and prevents destructive voltage transients across the switching elements.
Materials
Freewheeling diode: Silicon or Schottky semiconductor materials; Synchronous MOSFET: Silicon or gallium nitride (GaN) with copper or aluminum terminals, epoxy encapsulation.
Technical Parameters
  • Package Type TO-220, D2PAK, SO-8
  • Current Rating 5A-100A
  • Voltage Rating 20V-100V
  • Switching Frequency 100kHz-2MHz
  • Forward Voltage Drop 0.3V-0.7V (diode), <0.1V (MOSFET)
Standards
IEC 60747, JEDEC JESD22

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Freewheeling Diode / Synchronous MOSFET.

freewheeling diode synchronous MOSFET buck converter power electronics switching regulator energy recirculation Freewheeling Diode / Synchronous MOSFET Freewheeling Diode / Synchronous MOSFET in Electrical Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Buck Converter

A step-down DC-to-DC power converter that efficiently reduces a higher input voltage to a lower output voltage.

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Engineering Analysis

Risks & Mitigation
  • Thermal runaway due to excessive current
  • Reverse recovery issues in diodes
  • Gate driver failure in MOSFETs
FMEA Triads
Trigger: Overcurrent or overheating
Failure: Component thermal destruction or short circuit
Mitigation: Implement current limiting, thermal protection, and proper heatsinking
Trigger: Improper gate driving in synchronous MOSFET
Failure: Cross-conduction or shoot-through
Mitigation: Use dead-time control in gate drivers and ensure proper timing

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±5% for voltage ratings, ±10% for current ratings
Test Method
Dynamic switching tests, thermal cycling, HALT (Highly Accelerated Life Testing)

Buyer Feedback

★★★★☆ 4.8 / 5.0 (26 reviews)

"Standard OEM quality for Electrical Equipment Manufacturing applications. The Freewheeling Diode / Synchronous MOSFET arrived with full certification."

"Great transparency on the Freewheeling Diode / Synchronous MOSFET components. Essential for our Electrical Equipment Manufacturing supply chain."

"The Freewheeling Diode / Synchronous MOSFET we sourced perfectly fits our Electrical Equipment Manufacturing production line requirements."

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Frequently Asked Questions

What is the difference between a freewheeling diode and a synchronous MOSFET?

A freewheeling diode is a passive component that conducts when forward-biased, while a synchronous MOSFET is an active switch that replaces the diode to reduce conduction losses through lower voltage drop.

Why is this component essential in buck converters?

It provides a current path during the switch-off period, preventing high voltage spikes, enabling continuous inductor current, and improving efficiency by recirculating stored energy.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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