Ill-Logic - Electronic Circuits Projects Diagrams Free

Rescyou · 13th January 2004, 11:39 PM

I'm somewhat mosfet challenged... What should I be looking at within a mosfets datasheet to determine if it is drivable by a logic level type input? I use IRL520's quite a bit but they are overkill in a lot of cases, but I use them because I'm familiar with them.. and I haven't melted any of them as of yet.

Resc.

Rescyou · 14th January 2004, 12:08 AM

Just comparing a few data sheets leads me to believe that the gate threshold voltage must be within the range of the logic output. TTL being the case would be something under 5v. Is this a correct assumption?

Resc.

Roff · 14th January 2004, 06:23 PM

Well, that only tells half the story. If the part isn't spec'ed for 5v gate drive, then you can't be sure. Most MOSFET mfrs have a line of logic level MOSFETs. A Google search for "logic level MOSFET" will yield a wealth of links.

Rescyou · 14th January 2004, 08:24 PM

I've been doing that in some of the major distributors, but the search's aren't coming up with much. Take Digikey for instance, they only list 1 mosfet after searching for "logic level" even though they have quite a few. But I guess I'm going to have to search the general web for them and then search the numbers in the distributors.

Resc.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

13th January 2004, 11:39 PM	(permalink)
Rescyou	Ill-Logic I'm somewhat mosfet challenged... What should I be looking at within a mosfets datasheet to determine if it is drivable by a logic level type input? I use IRL520's quite a bit but they are overkill in a lot of cases, but I use them because I'm familiar with them.. and I haven't melted any of them as of yet. Resc.

14th January 2004, 12:08 AM	(permalink)
Rescyou	Not so Ill-Logic Just comparing a few data sheets leads me to believe that the gate threshold voltage must be within the range of the logic output. TTL being the case would be something under 5v. Is this a correct assumption? Resc.

14th January 2004, 06:23 PM	(permalink)
Roff	Well, that only tells half the story. If the part isn't spec'ed for 5v gate drive, then you can't be sure. Most MOSFET mfrs have a line of logic level MOSFETs. A Google search for "logic level MOSFET" will yield a wealth of links.

14th January 2004, 08:24 PM	(permalink)
Rescyou	Stuff I've been doing that in some of the major distributors, but the search's aren't coming up with much. Take Digikey for instance, they only list 1 mosfet after searching for "logic level" even though they have quite a few. But I guess I'm going to have to search the general web for them and then search the numbers in the distributors. Resc.