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Email Required, but never shown. Mark 1, 7 36 It’s not cheap 0. More seriously, just because 3.

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. What number am I looking for to determine whether 3. Some devices may have quite a bit higher Rdson at 3. The FQP30N06L is designed to be driven from voltages of at least 5V, which is the minimum voltage that they specify on-resistance.

The resistor from MCU pin to gate is also used to slow down the switching edge, to reduce ringing, overshoot, and EMI. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Therefore, Raspberry Pi’s 3. Instead, look at the datasheets and the catasheet on-resistance Rdson, which is specified at a certain gate-source voltage for each part. The data sheets can be misleading, they often give the gate voltage for mA current on the front page, and dataheet find that they datasheeh 12V for 5A, say.


It’s orfz14 just passing above the threshold voltage on a BJT.

IRFZ14 MOSFET Datasheet pdf – Equivalent. Cross Reference Search

Hi JasonS, forgive my ignorance. I don’t see in the specifications where 5V is given as a minimum. IR non logic level vs. In other words, it’s the mean behavior, not the extreme, and you can’t rely on it being valid for all devices.

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 Is this charging current high enough to damage the MCU pin? Don’t drive this directly from an MCU. 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?

Sign up using Email and Password. Home Questions Tags Users Unanswered. 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 Alastair McCormack 3. In other words, drive past that value. 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.

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But you really need a gate driving circuit from 3. Any lower than that, and you have no guarantees whatsoever of device behavior beyond the uA current of the Vgs threshold.


MCU pins are usually inputs on reset, and this could cause the gate to datqsheet momentarily, perhaps turning the device on, until the program starts running. There are some with datasheer inputs, though. I understand krfz14 the gate of the MOSFET behaves like a capacitor, and therefore draws some current while “charging”, and then none thereafter.

I’ve generally done the opposite: 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.

More discussion on this blog entry. I’d put two resistors into the circuit: Is this “saturation” achieved by simply providing a high enough voltage on the base that the MOSFET is completely “on”?

All of that said, I see that a lot of people still recommend dqtasheet an opto-isolator between the micro-controller and the MOSFET, just to be extra safe. The MOSFET isn’t considered “on” until the device has completely resistive behavior over a specified range of currents.

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If the VGS threshold is like 1.

IRFZ12 datasheet & applicatoin notes – Datasheet Archive

Sign up or log in Sign up using Google. Will this be sufficient? I have a few questions, however.