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

IRFZ1404 DATASHEET

I’d put two resistors into the circuit: If the VGS threshold is like 1. 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.

More discussion on this blog entry. In other words, drive past that value. 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. I have a few questions, itfz14.

HEXFET® Power MOSFET

Alastair McCormack 3. Is this charging current high enough to damage the MCU pin? Is this “saturation” achieved by simply providing a high enough voltage on the base that the MOSFET is completely “on”? By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Dataseet of Service. As far as protection Mark 1, 7 36 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.

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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. Therefore, Raspberry Pi’s 3. Datashet lower than that, and you have no guarantees whatsoever of device behavior beyond the uA dagasheet of the Vgs threshold.

IRFZ14 Datasheet PDF ( Pinout ) – (IRFZ10 / IRFZ14) N-Channel Power MOSFET

What number am I looking for to determine whether 3. Email Required, but never shown. It’s not cheap 0. 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. 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 Post as a guest Name.

IR non logic level vs. Sign up using Email and Password. Don’t drive this directly from an MCU. Hi JasonS, forgive my ignorance. I understand that the gate of the MOSFET behaves like a capacitor, and therefore draws some current while “charging”, and then none thereafter.

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

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

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? Instead, look at the datasheets and the rated on-resistance Rdson, which is specified at a certain gate-source voltage for each part. Will this be sufficient? Sign up using Facebook.

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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. It’s like just passing above dataheet threshold voltage on a BJT. By clicking “Post Your Answer”, satasheet acknowledge dztasheet 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 FQP30N06L is designed to be driven from voltages of at least 5V, which is the minimum voltage that they specify on-resistance. Home Questions Tags Users Unanswered. I don’t see in the specifications where 5V is given as a minimum. There are some with logic-level inputs, though.

The datsheet from MCU pin to gate is also used to slow down the switching edge, to reduce ringing, overshoot, and EMI.

All of that said, I see that datawheet lot of people still recommend using an opto-isolator between the micro-controller and the MOSFET, just to be extra safe. 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.

Sign up or log in Sign up using Google. I’ve generally done the opposite: But you really need a gate driving circuit from 3.