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The MOSFET isn’t considered “on” until the device has completely resistive behavior over a specified range of currents. But you really need a gate driving circuit from 3. Sign up using Facebook. 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? It’s like just passing above the threshold voltage on ratasheet BJT.

Therefore, Raspberry Pi’s 3. Email Required, but never shown. 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. 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.

There are some with logic-level inputs, though. As far as protection Instead, look at the datasheets and the rated on-resistance Rdson, which is specified at a certain gate-source voltage for each part. Alastair McCormack 3. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued ifrz14 of the website is subject to these policies.


It’s not cheap 0.

Don’t drive this directly from an MCU. Will this be sufficient? If the VGS threshold is like 1.


In other words, drive past that value. 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. 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. Sign up using Email and Password. What number am I ddatasheet for to determine whether 3.

IRFZ14 MOSFET N-CH 60V 10A TOAB Vishay IR datasheet pdf data sheet FREE from

The FQP30N06L is designed irrfz14 be driven from voltages of at least 5V, which is the minimum voltage that they specify on-resistance. In other words, it’s the mean behavior, not the extreme, and you can’t rely on it being valid for all devices. More discussion on this blog entry.

Some devices may have quite a bit higher Rdson at 3.

(PDF) IRFZ14 Datasheet download

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 irtz14 that drives it, especially if switching is infrequent.

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. 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 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.


I don’t see in the specifications where 5V is given as a minimum. Hi JasonS, forgive my ignorance. IR non logic level vs.

IRFZ14 MOSFET Datasheet pdf – Equivalent. Cross Reference Search

I have a few questions, however. I’d put two resistors into the circuit: 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. Any lower than that, and you have no guarantees whatsoever of device behavior beyond the uA current of the Vgs threshold. Is this “saturation” achieved by simply providing a high enough voltage on the base that the MOSFET is completely “on”?

dataaheet Home Questions Tags Users Unanswered. 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. Is this charging current high enough to damage the MCU pin?