FDV303N – Datasheet, PDF & Equivalent onsemi

FDV303N-NL-VB an N-channel SOT23 package MOS tube

FDV303N

If you’re considering using this MOSFET, here’s what you’ll want to know. It can handle voltages up to 25V and provides continuous current of about 0.68A, peaking briefly at 2A. Its low on-resistance—just 0.45Ω at 4.5V and 0.6Ω at 2.7V—means it stays efficient even at lower gate voltages, perfect for battery-operated devices.

Thanks to its low gate charge (2.3nC) and input capacitance (50pF), it switches quickly, boosting overall system efficiency. Plus, it has built-in ESD protection, handling up to 6kV to keep your circuit safe from static.

It’s packaged in a compact SOT-23 form, ideal for tight PCB layouts. Use it confidently in portable devices, battery management systems, DC-DC converters, and power management applications—it’s great wherever low-voltage, efficient switching is needed.

Fdv303n Pinout Diagram

When you’re hooking up this MOSFET, here are a few key tips. First, the gate (G) pin controls the MOSFET’s on and off states—keep its voltage within ±8V to prevent damage. It’s smart to add a small gate resistor, usually a few dozen ohms, to reduce noise and ringing.

Your source (S) pin should be connected directly to ground or your circuit’s common reference point, with short and wide connections to ensure solid grounding and better heat dissipation.

The drain (D) pin connects to your load. Always double-check that the load’s voltage and current don’t exceed the MOSFET’s limits (25V, 0.68A). Also, pay attention to proper heat management—give plenty of PCB area between the drain and source for good heat dissipation.

Lastly, always handle the device carefully to avoid static damage, and follow all recommended ratings in the datasheet to keep your setup safe and reliable.

Fdv303n Equivalent Mosfet Transistor

If you’re thinking about swapping out the FDV303N MOSFET, here’s what you need to watch for. First, always match the key specs—check your new MOSFET’s voltage rating (V_DS), current rating (I_D), and on-resistance (R_DS(on)) carefully. For instance, IRLML6344 has lower resistance and can handle higher currents, making it a good pick if you need more power.

Also, make sure your replacement MOSFET has a similar gate threshold voltage (V_GS(th)) so it turns on reliably with your existing drive voltage. Thankfully, replacements typically come in the same SOT-23 package, so you won’t need to redesign your PCB.

Don’t overlook heat management—choose a MOSFET with suitable power dissipation to prevent overheating. Lastly, if static electricity could be an issue, pick one with solid ESD protection, like FDV303N (>6kV) or IRLML6344, to keep things safe.

Fdv303n Switching Circuit Schematic

Here’s how your FDV303N MOSFET low-side switch works in a simple setup. You’re using it to control a 12V siren with just a small control signal like 3.3V or 5V. Connect the MOSFET gate (pin 1) through a 1kΩ resistor to your control signal to keep the gate stable and protected. Add a 47kΩ resistor to ground, so the MOSFET stays off when there’s no input signal, avoiding accidental triggers.

When your control signal goes high, the MOSFET gate voltage rises above its threshold (around 0.8-1V), switching the MOSFET on and activating your siren. When the signal drops to low, the MOSFET turns off, cutting the power to the siren.

Always ensure your gate voltage stays within ±8V. Although the MOSFET can handle more current (0.68A) and voltage (25V) than you need here, make sure your PCB layout includes proper heat dissipation, especially if your load is inductive—add a diode for extra protection.

Fdv303n Mosfet Gate Voltage

When you’re using the FDV303N MOSFET, it’s important to keep an eye on the gate voltage. Never let it exceed ±8V between the gate and source—going beyond this could permanently damage your MOSFET.

Typically, you’ll drive it with standard logic levels like 2.5V, 3.3V, or 5V. At voltages below 0.8V, your MOSFET stays off. Around 0.8V to 1V, it just starts turning on, but won’t handle much current yet. For reliable switching, stick to gate voltages of at least 2.5V.

Make sure to add a small resistor (usually a few tens to hundreds of ohms) in series with the gate to protect it from current spikes. Also, don’t leave the gate pin floating—connect a large resistor (like 47kΩ to 100kΩ) to ground to keep it stable and avoid accidental triggers.

Fdv303n Logic Ievel Mosfet Application

If you’re looking at using the FDV303N MOSFET, it’s a fantastic choice for logic-level circuits. It switches easily with low voltages around 3.3V or 5V, thanks to its low threshold voltage of about 0.8V. Plus, it has a low on-resistance (around 0.45Ω at 4.5V), making it efficient for handling loads like LEDs, relays, or motors.

Common uses include low-side switching, PWM-driven lighting or motor speed control, and even simple level shifting from low to higher voltages. Remember to always use a small resistor (around 100Ω) at the gate to protect it from voltage spikes and noise. Keep your gate voltage within the ±8V limit to avoid damage, and use a pulldown resistor to keep the gate from floating.

Also, ensure your PCB layout provides adequate heat dissipation, especially if you approach the MOSFET’s 0.68A current limit.