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I’ve generally done the opposite: The data sheets can be misleading, they often give the gate voltage for mA current on the front page, and you find that they need 12V for 5A, say.

But you really need a gate driving circuit from 3. The Datasheett isn’t considered “on” until the device has completely resistive behavior over a specified range of xatasheet.

Instead, look at the datasheets and the rated on-resistance Rdson, which is specified at a certain gate-source voltage for each part. I’d put two resistors into the circuit: 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.

IR non logic level vs. Alastair McCormack 3.

Therefore, Raspberry Pi’s 3. Is this “saturation” achieved by simply providing a high enough voltage on the base that the MOSFET is completely “on”? Will this be sufficient?


The FQP30N06L is designed to be driven from voltages of at least dataheet, which is the minimum voltage that they specify on-resistance. Sign up using Facebook. 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.


Email Required, but never shown. As far as protection 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.

IRFZ14 datasheet, IRFZ14 datasheets, manuals for IRFZ14 electornic semiconductor part

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? I don’t see in the specifications where 5V is given as a minimum. Hi JasonS, forgive my ignorance. More seriously, just because 3. 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.

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. In other words, drive past that value. In other words, it’s the mean behavior, not the extreme, and you can’t rely on it being valid for all devices. Any lower than that, and you have no guarantees whatsoever of device behavior beyond the uA current of the Vgs threshold.

Is this charging current high enough to damage the MCU pin?

Sign up using Email and Password. It’s like just passing above the threshold voltage on a BJT.

(PDF) IRFZ14 Datasheet download

Post as a guest Name. The resistor from MCU pin to gate is also used to slow down the switching edge, to reduce ringing, overshoot, and EMI.


Datashee the VGS threshold is like 1. 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. 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. All of that said, I see that a lot of people still recommend using an opto-isolator between the datashfet and the MOSFET, just to be extra safe.

What number am I looking for to determine whether 3. Some devices may have quite a bit higher Rdson at 3. I understand that the gate of the MOSFET rifz14 like a capacitor, and therefore draws some current while “charging”, and then none thereafter. It’s not cheap 0. The reason they include it at all is that the relative behavior current goes up with increasing gate voltage and increasing drain voltage is datzsheet Mark 1, 7 36 More discussion on this blog entry.

Don’t drive this directly from an MCU.

Sign up or log in Sign up using Google. I have a few questions, however. 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. There are some with logic-level inputs, though. Home Questions Tags Users Unanswered.