The switch at the heart of any power converter — the MOSFET or IGBT — gets the glory, but the gate driver and the freewheel diode around it decide whether the system runs cool or cooks. Choosing the switch is half the job; sourcing the supporting stage complete is the other half.
MOSFET vs IGBT: the voltage boundary
Below a few hundred volts, at the frequencies where switch-mode supplies live, the MOSFET wins on speed and loss. Above that, where currents climb into the tens or hundreds of amps, the IGBT's lower saturation voltage wins despite its slower turn-off. A 1200 V device such as the IKW40N120CS6 IGBT is commonly referenced in mid-power high-voltage stages, while lower-voltage MOSFETs handle the bulk of DC-DC and motor work.
The gate driver is the unsung hero
A MOSFET or IGBT only behaves well if its gate is driven hard and timed precisely. A weak driver leaves the device lingering in its high-loss transition region, turning switching energy straight into heat. A dedicated gate driver such as the IR2103S delivers the current and the half-bridge timing the switches need, and it isolates the logic from the power side. We stock the drivers alongside the switches so neither is missing from the bill.
The diodes that save the switch
Every inductive load needs a path for the current when the switch opens. Schottky and rectifier diodes such as the STPS20H100CW and the STPS30L45CW are what absorb that energy, and the BTS7970B class of driver integrates much of this for motor stages. Getting these right is what keeps a converter reliable under load.
Sourcing for a long-lived supply chain
Power semiconductors are cyclic and allocation-prone. Browse the power management chip range or send us the switch, driver and diode line items; we quote stock, date code and inspection options so a power stage does not stall on a single scarce device.
Frequently asked questions
How do I choose between a MOSFET and an IGBT?
Use a MOSFET for lower voltages and high-frequency switching where conduction and switching losses dominate at moderate current. Use an IGBT for high-voltage, high-current switching (hundreds of volts, tens to hundreds of amps) where its lower saturation voltage wins despite slower switching. The boundary is typically a few hundred volts.
Why is the gate driver as important as the switch?
The switch only performs as well as its gate is driven. A weak or slow driver leaves the device in its high-loss transition region longer, heating it and slowing the system. A proper gate driver delivers the current and timing the MOSFET or IGBT needs, and isolates the controller from the high-voltage side.
What supporting parts surround a power switch?
Gate drivers, freewheel or Schottky diodes, snubbers, current-sense and temperature monitoring. For half-bridge and motor stages, the driver and the protection diodes decide reliability as much as the switch itself.
Can you supply MOSFETs, IGBTs and gate drivers?
Yes. We stock power MOSFETs, IGBTs, gate drivers and the Schottky/freewheel diodes commonly referenced in power designs. Send the exact part numbers and quantity for a quote.
About us & trademarks: JTDZ Tech (Shenzhen Jingteng Electronics Technology Co., Ltd.) is an independent distributor of electronic components. We are not an authorised distributor or representative of the manufacturers named in this article. Manufacturer and part names are used for indicative purposes only, to help identify the components discussed; all trademarks remain the property of their respective owners. Always verify specifications against the manufacturer's datasheet before design-in or purchase.
