Looking for P-channel equivalent of an IRF510 Power MOSFET

[dinofx]

What is the P-channel equivalent of the N-channel IRF510 available at Radio Shack. I've discovered the IRF9530, but its rated at 16 amps when I only need 1.5, and I have no idea where to purchase this part.

 

[Optikon]

Re: Looking for P-channel equivalent of an IRF510 Power MOSF

What is the P-channel equivalent of the N-channel IRF510 available at Radio Shack. I've discovered the IRF9530, but its rated at 16 amps when I only need 1.5, and I have no idea where to purchase this part.

I doubt you'll find an equivalent P-ch FET at a radio shack. Frankly, I'm suprised that they even still sell IRF510's.

How many do you need? If it is say under 20 or so, why not find what you need from fairchild semiconductor and have them send you samples? They are free. If you have to buy them, mouser carries most of fairchild.

 

[dinofx]

Thanks for the sample suggestion. I'll try it out, assuming I know which part number to ask for. Why are you surprised that Radio Shack carries a MOSFET?

 

[Nigel Goodwin]

Thanks for the sample suggestion. I'll try it out, assuming I know which part number to ask for. Why are you surprised that Radio Shack carries a MOSFET?

Probably because they stock hardly ANY components these days?, at least according to posts in these forums. They actually pulled out of the UK years ago - where they were called Tandy.

 

[dinofx]

BTW, the "available at RadioShack" refers to the IRF510. I don't care where the P-channel equivalent comes from, I'm just looking for the part #.

 

[hjl4]

Tandy? yes that's right.

Here in Canada, Radio Shack, they also pulled out, just before christmas, and switched their name to The Circuit or something like that.

They still, hardly carry anything for electronic hobbiest. Just basic discreet components. Some LEDs ect...

As far as I'm concerned, they should just give up and close.

Everyone I know, when needing gates and semi conductors chips ect..., all order from the mega houses like Digikey ect...

 

[hjl4]

Anyways dinofx, sorry for not being so straight forward in your search, but I just did the hard work for you.

Here it is.

FRL9130D 5A/ -100V/ 0.550 Ohm/ Rad Hard/ P-Channel Power MOSFETs by Intersil
FRL9130H 5A/ -100V/ 0.550 Ohm/ Rad Hard/ P-Channel Power MOSFETs by Intersil
FRL9130R 5A/ -100V/ 0.550 Ohm/ Rad Hard/ P-Channel Power MOSFETs by Intersil

They have almost the same electrical characteristics, as a irf510
Check them out, I doubt that they will fit your purpose exactly,.

 

[hjl4]

Oh I forgot, Here is irf510 specs quickly 5.6A, 100V, 0.540 Ohm, N-Channel Power MOSFET.

Notice voltage polarity is reversed ???

Just making sure you understand what your doing.

Have fun.

 

[Nigel Goodwin]

BTW, the "available at RadioShack" refers to the IRF510. I don't care where the P-channel equivalent comes from, I'm just looking for the part #.

Why not simply look on the manufacturers website?, a couple of minutes soon shows that the P versions of their hexfet's simply have a leading '9' added, so the P version is IRF9510.

 

[hjl4]

We can't all be smart like you Nigel. :cry:
That is why you are GOD. :shock:
In your case, it never was how many post you made that made you this good, It was always because you were a GOD. :shock:
Now all bow. to our GOD.

 

[Nigel Goodwin]

We can't all be smart like you Nigel. :cry:
That is why you are GOD. :shock:
In your case, it never was how many post you made that made you this good, It was always because you were a GOD. :shock:
Now all bow. to our GOD.

If I thought you were being sarcastic?, I'd send a plague of locusts to visit :lol:

 

[hjl4]

Ha Ha Ha.


Just having fun.

Have a good day!

 

[dinofx]

Thanks, I was searching using "IRFP" But I guess the "P" refers to "power" and not "p-channel".

For those interested:

.subckt IRF9510 D G S
.model mosfet PMOS( LEVEL=7 VTO=-3.326 RS=0.31236 KP=2.296 RD=0.5824 TC1RD=0.0145 RG=50.893 IS=1e-36
+ CGDMAX=2.50E-10 CGDMIN=4.00E-12 XG2CGD=0.2 XG1CGD=0.1 CBD=8.41E-11 VTCGD=1.5)
.model diode D( IS=2.86e-30 RS=0.1801 TT=1.427e-07)
M1 D G S S mosfet
D1 D S Diode
Cgs G S 1.84E-10
.ends
.subckt IRF9520S D G S
.model mosfet PMOS( LEVEL=7 VTO=-3.298 RS=0.16468 KP=5.891 RD=0.29 TC1RD=0.0135 RG=24.569 IS=1e-36
+ CGDMAX=7.20E-10 CGDMIN=6.00E-12 XG2CGD=0.25 XG1CGD=0.1 CBD=1.18E-10 VTCGD=2)
.model diode D( IS=4.25e-26 RS=0.1259 TT=7.723e-06)
M1 D G S S mosfet
D1 D S Diode
Cgs G S 3.40E-10
.ends
.subckt IRF9530S D G S
.model mosfet PMOS( LEVEL=7 VTO=-3.214 RS=0.09611 KP=7.673 RD=0.1247 TC1RD=0.0157 RG=17.932 IS=1e-36
+ CGDMAX=1.40E-09 CGDMIN=4.00E-11 XG2CGD=0.25 XG1CGD=0.1 CBD=2.20E-10 VTCGD=1)
.model diode D( IS=1.27e-25 RS=0.069 TT=1.506e-07)
M1 D G S S mosfet
D1 D S Diode
Cgs G S 7.55E-10
.ends
.subckt IRF9540 D G S
.model mosfet PMOS( LEVEL=7 VTO=-3.192 RS=0.05098 KP=13.966 RD=0.0985 TC1RD=0.0124 RG=21.486 IS=1e-36
+ CGDMAX=2.00E-09 CGDMIN=2.00E-11 XG2CGD=0.2 XG1CGD=0.1 CBD=5.13E-10 VTCGD=1)
.model diode D( IS=2.39e-27 RS=0.0447 TT=1.465e-07)
M1 D G S S mosfet
D1 D S Diode
Cgs G S 1.27E-09
.ends
.subckt IRF9610 D G S
.model mosfet PMOS( LEVEL=7 VTO=-3.667 RS=0.47274 KP=0.813 RD=1.733 TC1RD=0.011 RG=10 IS=1e-36
+ CGDMAX=4.05E-10 CGDMIN=3.00E-12 XG2CGD=0.25 XG1CGD=0.1 CBD=3.06E-11 VTCGD=0)
.model diode D( IS=6.17e-61 RS=0.267 TT=1.762e-06)
M1 D G S S mosfet
D1 D S Diode
Cgs G S 1.53E-10
.ends

 

[hjl4]

So what did you finally settle for? Please,...... the suspense is killing me.... knowing, that there is potential for critisism here.

 

[dinofx]

I was going to use the MOSFET in favor of a power transistor because A) it takes very little current to drive it, and B), the voltage drop can be almost zero. But, after simulating it I don't see a big advantage over an NPN power transistor, mostly because my load is low resistance and the voltage drop is still going to be about the same.

My goal is to power the load between ~7 and 11 volts, approaching 12 volts is extra credit.

I am operating the MOSFET in "linear" mode by using its own output as feedback to the gate. Are they designed to operate in this range? Or should they just be "wide open".

 

[audioguru]

I tried simulating it, but the Mosfets in my software have static damage.

 

[Roff]

Do you need linear control? Would you like it to be predictable? If so, we can show you how. What is your input voltage range?

 

[dinofx]

My input voltage is from 0 to 4.2 volts (PWM through RC filter). I am running it through an opamp for gain and offset to get a control voltage of around 7 to 11 volts, which I am running through a power transistor.

The graphs show the opamp's output voltage and current, and the load's voltage, which is slightly lower due to the TIP31 drop.

Notice that the opamp is putting out almost 20mAh, which I believe is its limit. On a chip with 2 opamps, is the limit described per unit, or for the entire IC?

 

[audioguru]

Hi Dino,
A TL082 is guaranteed to drive a 2k load to 12V with a 15V supply. That's a 3V loss with only a 6mA load. Its typical short circuit current (with the full supply voltage as a loss) is 20mA per output.

 

[dinofx]

Thank guru. I see that if I want to maximize my maximum output voltage, I need to draw less current from the TL082, and/or use a ua741. The revised design has a maximum output of 11 vs 10.4 before.

I didn't know how to improve my gain. I thought I had to stack two NPNs in series, which results in double the voltage drop. Then I found out about stacking a PNP and NPN pair, as shown in the following attachment. The OpAmp current draw is *much* less now. The TIP36 is overkill, I'm actually going to use the TIP41/42, but I couldn't find a spice model for it.

Does this look like it should work? The Op-Amp on the left side is boosting my tachometer pulse. I'm not sure if I need to boost it back to near 12-volts (which is why I was using the TL082, since it's a dual IC). I have a feeling my motherboard should detect the RPMs even if they are ticking at just 7.5 volts. If so, I'll use a 741.