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Will this datasheeg sufficient? By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

irfz1 More seriously, just because 3. The data sheets can be misleading, they often give the gate voltage for orfz14 current on datashedt front page, and you find that they need 12V for 5A, say. Any lower than that, and you have no datashete whatsoever of device behavior beyond the uA current of the Vgs threshold. I’ve generally done the opposite: Home Questions Tags Users Unanswered.

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. By placing a resistor in series with the gate, I can protect the pin, but this will slow down the switch, possibly resulting in high heat dissipation by the MOSFET?

What number am I looking for to determine whether 3. But you really need a gate driving circuit from 3. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. It’s not cheap 0.


Sign up using Email and Password. The big thing is to look in the data sheet and check the VGS threshold value and look at the graph that shows current flow vs VGS.

There are some with logic-level inputs, though. Sign up or log in Sign up using Google. As far as protection Email Required, but never shown. Is this charging current high enough to damage the MCU pin?

Note that “logic level” does not seem to be an exactly standardized term, and it won’t necessarily show up as a parameter in the parametric search at the vendor sites, nor will it necessarily show up in the data sheet. The downside is that a MOSFET doesn’t pull a constant amount of current across the entire edge, since it looks like a resistor; this slows down switching a capacitive load.

Hi JasonS, forgive my ignorance. I’d put two resistors into the circuit: More discussion on this blog entry. It’s like just passing above the threshold voltage on a BJT. Don’t drive this directly from an MCU. Some devices may have quite a bit higher Rdson at 3. I understand that the gate of the MOSFET behaves like a capacitor, and therefore draws some current while “charging”, and then none thereafter.

The reason they include it at all is that the relative behavior current goes up with increasing gate voltage and increasing drain voltage is universal Therefore, Raspberry Pi’s 3.

Alastair McCormack 3. In other words, it’s the mean behavior, not the extreme, and you can’t rely on it being valid for all devices. IR non logic level vs. Is this “saturation” achieved by simply providing a high enough voltage on the base that the MOSFET is completely “on”? I don’t see in the specifications where 5V is given as a minimum. Sign up using Facebook. Instead, look at the datasheets and the rated on-resistance Rdson, which is specified at a certain gate-source voltage for each part.


The MOSFET isn’t considered “on” until the device has completely resistive behavior over a specified range of currents.

IRFZ14 MOSFET Datasheet pdf – Equivalent. Cross Reference Search

Post daatasheet a guest Name. MCU pins are usually inputs on reset, and this could cause the gate to float momentarily, perhaps turning the device on, until the program starts running.

The resistor from MCU pin to gate is also used to slow down the switching edge, to reduce ringing, overshoot, and EMI. The FQP30N06L is designed to be driven from voltages of at least 5V, which is the minimum voltage that they specify on-resistance.

In other words, drive past that value. I have a few questions, however.

You only pay power to switch a MOSFET, not to keep it on, which reduces power dissipation in both the transistor and the part that drives it, especially if switching is infrequent. All of that said, I see that a lot of people still recommend using an datashdet between the micro-controller and the MOSFET, just to be extra safe.