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I understand that the gate of the MOSFET behaves like a capacitor, and therefore draws some current while “charging”, and then none thereafter. The big thing is to look rifz14 the data sheet and check the VGS threshold value and look at the graph that shows current flow vs VGS.

It’s not cheap 0. Is this charging current high enough to damage the MCU pin?

IRFZ14 Datasheet PDF – Samsung Electronics

Don’t drive this directly from an MCU. MCU pins are usually inputs on reset, and this could cause the gate datasehet float momentarily, perhaps turning the device on, until the program starts running.

In other words, drive past that value. As far as protection I’d put two resistors into the circuit: Email Required, but never shown. Sign up using Facebook.

Any lower than that, and you have no guarantees whatsoever of device behavior beyond the uA current of the Vgs threshold. 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. More seriously, just because 3. But you really need a gate datashee circuit from 3. The downside is that a MOSFET doesn’t pull a constant amount of current datashet the entire edge, since it looks like a resistor; this slows down switching a capacitive load.


Will this be sufficient? By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. What number am I looking for to determine whether 3. I’ve generally done the opposite: Is this “saturation” achieved by simply providing a high enough voltage eatasheet the base that the MOSFET is completely “on”? More discussion on this blog entry.


Sign dataheet using Email and Password. Mark 1, 7 36 I don’t see in the specifications where 5V is given as a minimum. Hi JasonS, forgive my ignorance. The resistor from MCU pin to gate is also used to slow down the switching edge, to reduce ringing, overshoot, and EMI.

In other words, it’s satasheet mean behavior, not the extreme, and you can’t rely on it being valid for all devices. IR non logic level vs.

Alastair McCormack 3. Therefore, Raspberry Pi’s 3.

IRFZ14 — Зенер Электроникс

Some devices may have quite a bit higher Rdson at 3. Sign up or log in Sign up using Google. 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? The FQP30N06L is designed to be driven from voltages of at least 5V, which is the minimum voltage that they specify on-resistance.

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. If the VGS threshold is like 1. 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. Home Questions Tags Users Unanswered. The MOSFET isn’t considered “on” vatasheet the device has completely resistive behavior over a specified range of currents.


Instead, look at the datasheets and the rated on-resistance Rdson, which is specified at a certain gate-source voltage for each part. 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 reason they include it at all is that the relative behavior current goes up with increasing gate voltage and increasing drain voltage is universal It’s like just passing above the threshold voltage on a BJT. Post as a guest Name. There are dataseet with logic-level inputs, though.

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. 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.

I have a few questions, however.