MOSFET IGBT and Transistor Hub
Use the MOSFET IGBT and Transistor Hub to choose devices, check ratings, solve failures, verify alternatives, and reach the right Good-Ark technical support path.
41 guides
Choose the path for the question in front of you: identify a transistor, compare device families, select a switching device, or check its drive and thermal behavior. Introductory guides sit alongside the deeper design references.
Identify devices and compare switching choices
Start with pins, polarity and device-family differences before choosing an implementation.
Gate, Drain, Source: The Three Pins of a MOSFET Explained With a Water Analogy
Most beginner wiring mistakes with a MOSFET come from one misunderstanding: the gate voltage is measured between the gate and the source, not between the gate and the circuit’s ground. Once that rule is clear,…
MOSFET or Transistor: Twelve Practical Scenarios That Pick the Winner
The MOSFET-versus-transistor question is usually answered with equations, but most builders face it as a list of loads: an LED here, a motor there, a sensor needing a signal. Twelve practical scenarios, each…
MOSFET vs BJT for Switching: Where the Transistor Choice Actually Changes Your Circuit
A MOSFET and a BJT can both switch the same load in many circuits, and choosing between them comes down to what the rest of the circuit asks. The BJT is a current-controlled valve: it turns on with base…
NPN vs PNP: Wiring, Switching, and the Two Habits That Prevent Wrong Choice
The difference between NPN and PNP transistors is the easiest thing in electronics to memorize and the easiest to get wrong in the wiring. The symbols look nearly identical, and the two parts are wired…
Pre-Biased Transistors Demystified: Why the Resistors Are Inside and How to Read Them
A pre-biased transistor is a small-signal BJT with its bias resistor built into the package, and it exists to solve a specific board problem: driving a transistor directly from logic without a separate…
Transistors for Power and Signal Design: Types and Selection
Transistors are semiconductor devices that control current and can provide switching or amplification. In signal circuits they shape, amplify or buffer an electrical signal. In power circuits they control…
What Is a Digital Switching Transistor?
A digital switching transistor hides its bias resistors inside the package. What the 7-13 kOhm tolerance means, and when a plain BJT is the better choice.
What Is a General Purpose NPN Transistor?
A general-purpose NPN transistor is a ratings envelope: 40 V, 200 mA, gain 100-300. How to size the base resistor, and when a MOSFET is the better answer.
What Is a General Purpose PNP Transistor?
A general purpose PNP transistor is a bipolar junction transistor used for switching and amplification, especially on the high side of a circuit. It turns on when the base is driven lower than the emitter,…
What Is a High-Speed Gate Driver? Operation, Timing and Selection
In power electronics, a high-speed driver usually means a high-speed gate driver: a circuit that translates a controller’s command into the gate voltage and brief charging or discharging current required by a…
What Is a Pre-Biased Transistor?
A pre-biased transistor is a bipolar transistor with built-in resistors that simplify switching circuits. It reduces external parts, saves PCB space, and lowers assembly cost while making design more…
What Is a SOT-23 Bipolar Transistor?
A SOT-23 bipolar transistor fixes footprint, pinout, thermal path and marking. How the outline sets usable current, and when to move to a smaller package.
Select MOSFETs and IGBTs for the circuit
These guides connect voltage class, application and package to the switching-device decision.
1200V IGBTs for 4–16 kHz Motor Drives: Loss, Ruggedness, and Packaging
Key Takeaways The 1200 V IGBT remains the workhorse of industrial power conversion—not because it is the newest technology, but because it hits the right balance of cost, ruggedness, and drive simplicity for…
650V IGBTs for Induction Heating and Appliance Drives
The 650 V IGBT lives where the 1200 V part does not go: compact, high-frequency, cost-driven stages in home appliances, induction cookers, and small industrial equipment. It competes against 600 V MOSFETs on…
Good-Ark MOSFET: A Practical Guide For B2B Semiconductor Sourcing
A MOSFET is not selected on the on-resistance in the summary line; it is selected on that resistance hot, on the avalanche energy it can absorb, and on the derating curve that connects the two. A real 600 V…
High Voltage MOSFETs: Ratings, Losses and Circuit Design Checks
A high voltage MOSFET must block the voltage at its own terminals, including switching excursions, while meeting the converter’s loss and thermal limits. A large drain–source rating alone cannot establish…
IGBT Basics for Power Electronics: Ratings, Structure, and the Selection Questions That Matter
The IGBT is the power semiconductor that most engineers meet last, and it is also the one whose datasheet reads most like a compromise: a device that switches like a transistor and conducts like a diode, with…
IGBT vs MOSFET: How IGBTs Work and How to Select Them
Choosing between an IGBT and a MOSFET starts with the converter’s current and switching events. An insulated gate bipolar transistor combines a voltage-controlled insulated gate with bipolar conduction in its…
IGBTs in Welding and Induction Heating: High-Current Pulses, dv/dt, and the Smoke Test
Welding and induction heating are the harshest IGBT duties outside the motor drive, because both throw high-current pulses at the device faster and harder than a steady load ever does. A welder draws a current…
Isolated DC-DC Power Modules for Gate Drive and Industrial Control: Selection
An isolated DC-DC converter can be built from a transformer, a controller, and a handful of discrete parts—or bought as a module that packages all of it into one component. For gate-drive supplies, industrial…
Logic-Level Power MOSFETs: Driving Loads Directly From 3.3V and 5V GPIO
Last updated: October 11, 2026 Key Takeaways Every design team eventually hits the same wall: the microcontroller speaks 3. Before you finalize the BOM, compare the related options: Logic-Level Power MOSFETs…
Low RDS(on) Power MOSFETs: When Paying for Lower On-Resistance Actually Pays
Every MOSFET datasheet leads with RDS(on), and it is tempting to sort a supplier table by that number and take the smallest value. But on-resistance is bought with silicon area, and silicon area is bought with…
MOSFET Selection for a Switching Power Supply: Voltage, RDS(on), and the D-Series Trade
Selecting a MOSFET for a switching power supply is usually presented as a parts hunt — filter the catalog by voltage, pick a low RDS(on), done. The parts hunt fails in practice because two different loops…
N-Channel vs P-Channel Power MOSFETs: Which Polarity Fits Your Load Switch?
The first question in almost every load-switching design is not which part number to use—it is which polarity. N-channel and P-channel MOSFETs solve the same switching problem from opposite sides of the…
Power MOSFET Selection Guide: Voltage, Polarity, Loss, and Package
This guide is the entry point to the Good-Ark power MOSFET library: it maps the selection decisions—voltage class, polarity, loss budget, and package—and points to the dedicated articles that go deep on each…
Super Junction MOSFETs: How Charge Balance Wins in PFC, Flyback, and LLC
Key Takeaways Super junction MOSFETs use charge-balanced pillars to break the classic voltage-versus-RDS(on) trade-off, which is why they dominate high-voltage PFC, flyback and LLC stages. Compare datasheets…
Synchronous Rectifier MOSFETs: Cutting Losses in Low-Voltage High-Current Outputs
Key Takeaways A 5 V, 20 A output with a Schottky rectifier burns more power in the diode than in the transformer. Before you finalize the BOM, compare the related options: Synchronous Rectifier MOSFETs and…
TO-247 vs TO-220 vs D2PAK IGBTs: Thermal Mounting and Module Crossover
Not every IGBT design needs a power module. Below a few tens of kilowatts, discrete IGBTs in TO-247, TO-220, and TO-263 packages carry the load with lower cost, simpler sourcing, and a flexible layout—provided…
Trench vs Planar MOSFETs: Which Structure Fits Low-Voltage Power Switching?
Key Takeaways Two letters on a datasheet—”trench” or “planar”—tell you more about a power MOSFET than most of its front-page numbers. Before you finalize the BOM, compare the related options: Trench vs Planar…
When the Job Calls for IGBT Instead of a MOSFET: Voltage, Switching, and Total Cost
A MOSFET and an IGBT can both switch high power, and the choice between them is not about which is “better” but about where the duty sits. The MOSFET wins at moderate voltage and high frequency; the IGBT wins…
Drive, cool and test the device
Read the drive, protection and measurement guidance together with the device data sheet.
Checking an NPN Transistor with a Multimeter: The Base-Collector-Emitter Map and Gain Sniff Tests
Transistors are the diodes that never quite behave like diodes. A transistor datasheet describes a three-terminal device with gain, saturation, and switching behavior, and the multimeter test that works for a…
Gate Drive Design Guide: Sizing, Timing, and Protection
This guide is the shared reference for gate-drive design across the Good-Ark library. It covers the two questions every drive design answers—how much current, and how much dead time—plus the protection set,…
How Do You Choose a MOSFET for a Switching Power Supply?
A MOSFET for a switching power supply must match the bus voltage, load current, switching frequency, and thermal limits. The best choice balances low RDS(on), low gate charge, adequate voltage margin, and…
MOSFET Datasheet Lingo: RDS(on), VGS(th), SOA, and the Numbers That Decide Your Design
A MOSFET datasheet is a compact page of critical parameters, and the ones that decide a design are fewer than they look — but each carries conditions that change its meaning. The on-resistance is quoted at a…
MOSFET Thermal Reality: How a 20 mOhm Part Becomes 35 mOhm Hot and Its Loss Quadruples
A MOSFET datasheet quotes an RDS(on) at 25 °C, and the part on your board runs at 100 °C — where its on-resistance has climbed to nearly double and the conduction loss has grown by the square of any current…
Reverse-Polarity Protection in BMS: Diode vs Ideal-Diode MOSFET
The reverse-polarity diode in a BMS pays its forward drop on every operating hour, and the loss—0.5 V at 5 A is 2.5 W—is the trade against the ideal-diode MOSFET’s complexity. This guide answers the single…
Staying Inside the SOA: Reading MOSFET Safe-Operating-Area Curves for Repetitive Pulses
The safe-operating-area curve is the MOSFET datasheet page that looks like a simple V-I plot and behaves like a set of stacked limits. A single DC operating point sits inside a thermal box; a pulse train can…
Testing a MOSFET with a Multimeter: The Capacitance Sign, Diode Check, and Short Detection
Testing a MOSFET with a multimeter feels like testing a capacitor, and that feeling is the clue. A good MOSFET holds a charge on its gate like a capacitor, the body diode can restore that charge, and a shorted…
TO-252 (DPAK) Power MOSFETs: Thermal Design and PCB Footprint
The TO-252, also called DPAK, is the workhorse surface-mount power package: small enough for high-volume assembly, rugged enough for automotive and industrial boards, and thermally capable when the PCB is…
Transistor Sizing for Relay Coils: Base Resistor, Saturation, and the Flyback Loop in One Working Sheet
Sizing a transistor to drive a relay coil looks like a two-line exercise — pick a transistor, pick a resistor — and the smoke follows when the worst-case numbers are skipped. A relay coil is an inductor that…
Zener Gate Protection for MOSFETs: Rescuing Gates from Overvoltage and Spikes
The gate oxide of a MOSFET is a door roughly 20 nanometers thick, and spikes and ringing can break it. A gate driven past its voltage limit, or hit by a fast dv/dt spike, fails the part in an instant — and the…
Need help with a particular circuit?
Include the circuit position, operating conditions and the part number or marking when you contact Good-Ark technical support.
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