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Instead, look at the datasheets and the rated on-resistance Rdson, which is specified at a certain gate-source voltage for each part. Is this charging current high enough to damage the MCU pin? It’s not cheap 0.

IRFZ14 Datasheet PDF – Vishay Semiconductors

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

Don’t drive this directly from an MCU. Will this be sufficient? Post as a guest Name. Sign up or log in Sign up using Google. IR non logic level vs.


What number am I looking for to determine whether 3. I have a few questions, however. All of that said, I see that a lot of people still recommend using an opto-isolator between the micro-controller and the MOSFET, just to be extra safe.

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. As far as protection Alastair McCormack 3.

I’d put two resistors into the circuit: More discussion on this blog entry. In other words, drive past datazheet value. I don’t see in the specifications where 5V is given as a minimum.


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. If the VGS threshold is like 1.

But you really need a gate driving circuit from 3. Mark 1, 7 36 Any lower than that, and you have no guarantees whatsoever of device behavior beyond the uA current of the Vgs threshold. Some devices may have quite a bit higher Rdson at 3. Therefore, Raspberry Pi’s 3. Hi JasonS, forgive my ignorance. Is this “saturation” achieved by simply providing a high enough voltage on dstasheet base that the MOSFET is completely “on”?

It’s like just passing above the threshold voltage on a BJT.

Sign up using Facebook. Email Required, but never shown. 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 resistor from MCU pin to gate is also used to slow down the switching edge, to reduce ringing, overshoot, and EMI.

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 By placing a resistor in series with the gate, I can protect the pin, but this will slow down the switch, possibly resulting datashset high heat dissipation by the MOSFET?

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. 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. The FQP30N06L is designed to be driven from voltages of at least 5V, which is the minimum voltage that they specify on-resistance.


There are some with logic-level inputs, though. The downside is that a MOSFET doesn’t pull a constant amount of current across the entire edge, since it looks like datasueet resistor; this slows down switching a capacitive load.

IRFZ14 datasheet, Pinout ,application circuits HEXFET® Power MOSFET

I understand that the gate of the MOSFET behaves like a capacitor, and therefore draws some current while “charging”, and then none thereafter. In other words, it’s the mean behavior, not the extreme, and you can’t rely on it being valid for all devices.

Sign up using Email and Password. I’ve generally done the opposite: Note that “logic level” does not irfz144 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. MCU pins are usually inputs ratasheet reset, and this could cause the gate to float momentarily, perhaps turning the device on, until the program starts running.

More seriously, just because 3. Home Questions Tags Users Unanswered.