Please note that the SI2302 is a small SMD part and is not suitable for users who are new to electronics unless they can get help with soldering. If you're not sure which option to choose, choose the TO-220s. Also be aware that MOSFETs are ESD-sensitive parts by their nature.
I selected these N-channel MOSFETs as ideal general purpose MOSFETs to use with hobbyist microcontrollers such as the Arduino and the Raspberry Pi computer. The SI2302 has a continuous drain current rating of 2.2 A while the IRF3708 has a continuous drain current rating of 52 A.
One of the main features of these MOSFETs is their low on-resistance (Rds(on)). It is rated at 8.5 mΩ and 9.5 mΩ (at a gate voltage of 4.5 V) for the SI2302 and IRF3708 respectively. This means that the MOSFET can switch high currents with minimal power loss and heating.
Additionally, the SI2302 and IRF3708 both have low gate threshold
voltages, which means that they can be turned on easily by the
output of a low-voltage microcontroller (Rsd(on) 11.5 mΩ at 2.5 V and 14.5 mΩ at 2.8 V
respectively). This makes them a great choice for hobbyists and makers who want to control high-power
devices using their Arduino, Raspberry Pi, STM32 or other microcontrollers. Please
compare these afforementioned values to the specifications of other MOSFETs being
sold as "logic level" on eBay; I've tried and failed to
find anything better at a sensible price. Depending on your application (in particular, current and switching frequency), what you save on the MOSFET you may have to pay for in the heatsinks (which I also sell, by the way!).
Absolute maximum ratings:
| MOSFET | Drain-Source Voltage | Gate-Source Voltage | Continuous Drain Current | Pulsed Drain Current | Power Dissipation | Operating Junction Temperature |
|---|---|---|---|---|---|---|
| SI2302 | 20 V | ±8 V | 2.2 A (at Tc 70 °C) | 10 A | 0.8 W (at Tc 70 °C) | -55°C to +150°C |
| IRF3708 | 30 V | ±12 V | 52 A (at Tc 70 °C) | 248 A | 61 W (at Tc 70 °C) | -55 °C to 175 °C |
Delivery
Orders will be dispatched within one business day, using recycled packaging wherever viable.
By default, all orders are dispatched by Royal Mail Second Class/RM48. If your order is needed urgently, you are encouraged to select an upgraded postage option, such as First Class/RM24 or Royal Mail Special Delivery, during checkout.
Some areas of the UK have experienced a degraded level of service from the Royal Mail, with deliveries as infrequently as once per week or worse. If you are currently affected by this, please contact me before ordering to discuss the possibility of using an alternative courier service.