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FQD3N40TF-VB Product details
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Imagine this: You are designing a high-voltage auxiliary power supply or industrial control module, where the circuit needs to withstand a 400V bus voltage, but the load current is not large, yet the requirements for device withstand voltage and reliability are extremely high. Ordinary low-voltage MOS transistors would break down instantly here, while high-voltage devices often have bulky packages and difficult drive requirements. The VBsemi FQD3N40TF-VB is designed for this purpose—it integrates 400V withstand voltage, 2A current carrying capacity, and stable planar technology into the compact TO252 package, making high-voltage switching design simple and reliable.
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Product parameter：
| VB Package | Configuration | VDS(V) | VGS | Vthyp（V） | ID(A) | Rds2.5 | Rds4.5 | Rds10 | Technology |
|---|---|---|---|---|---|---|---|---|---|
| TO252 | Single-N | 400V | 3V | 2A | 3500(mΩ) | Planar |
| VB Package | Configuration | VCE | VGE | VGEth(V) | VCEsat15V | ICE | Technology |
|---|---|---|---|---|---|---|---|
| TO252 | Single-N | Planar |
| VB Package | Configuration | VDS(V) | VGS | Vthyp（V） | ID(A) | Rds18 | Technology |
|---|---|---|---|---|---|---|---|
| TO252 | Single-N | 400V | 3V | 2A | Planar |
| VB Package | Configuration | VDS(V) | VGS | Vthyp（V） | ID(A) | Rds6 | Technology |
|---|---|---|---|---|---|---|---|
| TO252 | Single-N | 400V | 3V | 2A | Planar |
| VB Package | Polarity | Vz / VR | Pd | VF | IF | IR | Cd | Type |
|---|---|---|---|---|---|---|---|---|
| TO252 | Single-N |
Voltage 400V, confidently handles high-voltage bus surges
Gate drive range ±20V, compatible with common PWM drivers
Threshold voltage 3V, clear and reliable logic level drive
On-resistance 3500mΩ (at 10V drive), balanced performance in high-voltage devices
Max current 2A, suitable for small to medium power switching applications
TO252 package, balancing heat dissipation and SMT production convenience
Gate drive range ±20V, compatible with common PWM drivers
Threshold voltage 3V, clear and reliable logic level drive
On-resistance 3500mΩ (at 10V drive), balanced performance in high-voltage devices
Max current 2A, suitable for small to medium power switching applications
TO252 package, balancing heat dissipation and SMT production convenience
Domain and module applications：
Switching Power Supply Auxiliary Winding Supply – Acts as a high-voltage startup or clamp switch, reliably withstanding 400V stress, improving system safety.
LED Street Light/Industrial Light Driver – Used as the main switch in flyback topologies, combined with low switching losses of planar technology, extending lamp life.
Industrial Sensor Power Module – Tolerates wide input voltage fluctuations, providing reliable isolated conversion for downstream control circuits.
Smart Meter/Power Terminal – Used for high-side switching control, precise action, stable and reliable long-term operation.
AC-DC Adapter Auxiliary Power Supply – Completes startup and energy transfer on the high-voltage side, simplifying startup circuit design.
Photovoltaic Inverter Auxiliary Power Supply – Withstands high voltage input from solar panels, providing a stable auxiliary power rail for driver ICs.
One-sentence summary: FQD3N40TF-VB is not an ordinary MOS tube; it is your "voltage withstand guardian" and "stability cornerstone" in high-voltage power supply design.
* Please note: the above is only an example application scenario, the specific application depends on the requirements and conditions of the system design. When using this device, consult its data sheet for detailed technical specifications and features
Technical support：
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