Logic-Level Power FETs you'd like to see/use??

Using Arduino Motors, Mechanics, Power and CNC
#1

Hi, I’m trying to standardize on a couple of power FETs that are easy to drive directly from Arduino. I want one low-power easy to use, and one medium power. After digging quite a bit I found these two candidates that I can buy at a good price in Shenzhen (China):

ZVN4206 TO92 “Transistor” package, 60V .6 Amps http://yourduino.com/docs/ZVN4206A.pdf (Sell 20-24 cents)

IRLZ34 To220 “Power Transistor” package 55V 18 Amps http://yourduino.com/docs/irlz24n.pdf (Sell $1 or less )

I want these for typical hobbyist applications, and for educational kits that I build. I know there are some cool High Power FETs but that’s a different arena.

Please comment on these choices and nominate your favorites you have worked with. I’ll try to find good street prices on others if they seem better than my research!

Thanks…

#2

Neither are logic level mosfets.

So I guess for beginners/kits neither are ideal unless you're happy not being able to saturate the transistor.

#3

http://www.nxp.com/documents/data_sheet/PHB_PHD_PHP21N06LT.pdf

That's a true logic level mosfet.

#4

Neither are logic level mosfets.

Please read the datasheets. See the gate thresholds and characteristic curves.

Both of these will be turned strongly by an Arduino outoput.

#5

The IRLZ34 has about the highest on-resistance for a MOSFET in its class I’ve see,
practically 0.1 ohm at logic voltages, limiting heatsink-free use to 1.5A or so.

They available with Rds(on) <= 0.01 ohms and V >= 55V, which is a lot
more general purpose. TO220 with logic level is tricky, but how about:
http://uk.farnell.com/nxp/buk954r8-60e/mosfet-n-ch-60v-100a-to-220ab/dp/2254188

4m ohm and 100V, pretty cheap too, handle upto 8A without heatsink, quite a lot of
LED strips :wink:

#6

buk954r8-60e

That's a really nice device, Mark. It would be good at 3.3V even. I put the datasheet up:
http://yourduino.com/docs/BUK954R8-60E.pdf

The PHP21N06LT is similar but not as sharp a turn-on in the 2.5 to 5V region.

I'm looking for both from a good supplier in Shenzhen, good price...

Any other comments, nominations appreciated...

#7

STP40NF10L

#8

Sparkfun sells the below MOSFETs which might indicate that they work well for the typical hobby setup.

#9

RFP30N06LE
SEE ATTACHED

RFP30N06LE.pdf (189 KB)

#10

Great.. Looking more at:

RFP30N06LE (Looks good, has ESD protection, could sell for 75 cents )
FQP30N06L (Similar, no ESD protect)
STP40NF10L (Lower RDS(on) )

This is even more fun than figuring out why I'd want to use a 12AU7 VS a 12AX7* :slight_smile: And I get to search in Chinese.

#11

terryking228:
This is even more fun than figuring out why I'd want to use a 12AU7 VS a 12AX7*

Going to need a solid-state replacement for pentagrid converters (but let's not get distracted.)

#12

terryking228:
Any other comments, nominations appreciated...

I've also recently started looking into this. Here are some others one could consider:
IRLZ44N - the automotive versions seem to have even lower Rds (AUIRLZ44N)
STP22NF03L
IRLB8748PbF

#13

Gate Threshold voltage is the voltage at which the MOSFET just starts to turn on, often specified at about 1mA. True in this case, too.

ID=1mA, VDS= VGS

On state for 3A current is rated at 10V on the Gate to Source.

#14

AOI510 TO251A "Power Transistor" package 30V 70 Amps Datasheet
Digi-Key (Sells for $0.86 each to $0.343 x 1000 )

#15

Christo, thanks…

IRLZ44N - Nice… …025 ohms at 5V and I can find it at a good price in China, sell for 75 cents or so…
STP22NF03L Nice. Low RDson Also good price
IRLB8748PbF Nice again, VERY low RDSon at .005 ohms 4.5V

I can find those 3 at the good price (usually 2.5 to 3.0 RMB) in Shenzhen, China from suppliers I do some business with. So can sell at 75 cents to a dollar and be worth handling. Not a big part of Arduino business but an area I want to cover.

Now: IsThere a better device in TO92 or other small case that is better than the ZVN4206 which is pretty oldskool?

BTW, the easiest best Data Sheet place I’ve found is http://www.datasheets.com/ You need to make a login but no hassles from them.

NOW: Another consideration: I want to put these in educational kits similar to:
http://yourduino.com/sunshop2/index.php?l=product_detail&p=360

AND I’m concerned about ESD, both from just dropping them into those Harbor Freight plastic boxes, and from students picking them up and plugging them into breadboards. So I’m looking at the RFP30N06LE specifically for it’s ESD protection. The gate oxides on ALL of these are pretty thin!

Installed in a PCB with care about ESD they’re AllGood. But the the classroom, maybe Trouble. Anyone have experience with this?

Thanks for the help and perspectives!

#16

Static protection is a tricky one - the main precaution is one you have no control over,
namely to ban nylon carpets. I think the best you can do is to provide black conducive
foam packaging (the sort you stick the legs into) and prominent warning stickers.

Power MOSFETs have a lot of capacitance which helps protect the gate from small amounts
of charge.

#17