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Substitute IRF 530n with IRF 510

 

Can it be done ? I have a couple of those cheap Chinese RF amps. One is working well and that came with good quality IRF530n MOSFETS.? The other one has dicey MOSFETS were they have been ground down to remove any visible information. I have a good supply of Vishay 510's and wondered if I could do a straight swap. Haven't looked at the data sheets yet but wondered if anyone knows for sure or has tried it. Good quality 530n's seem to be a bit hard to get hold of.

Reg???????????????????????? G4NFR
 

If anything, the 510s have lower gate capacitance.? The are a little less robust in their designed use, but might be more robust in RF service. You really can't damage anything else anyway and they should work.? Go for it...?

Fred W0FMS?

On Sat, Dec 11, 2021, 1:03 PM R. Tyson via <tysons2=[email protected]> wrote:
Can it be done ? I have a couple of those cheap Chinese RF amps. One is working well and that came with good quality IRF530n MOSFETS.? The other one has dicey MOSFETS were they have been ground down to remove any visible information. I have a good supply of Vishay 510's and wondered if I could do a straight swap. Haven't looked at the data sheets yet but wondered if anyone knows for sure or has tried it. Good quality 530n's seem to be a bit hard to get hold of.

Reg???????????????????????? G4NFR

 

Digi-Key appears to have plenty of the Infineon version, over 13,000:?? They have another?17,000 from Vishay, without the N because they're from another company:?? Either of those should?be good substitutes for the questionable?transistors in the amplifier from China.

The reason you might have?come up empty when searching for them is that you didn't include PBF in the part number. That indicates the lead-free version of the part; the version with lead is obsolete?and no longer made. Lead-free parts are fine even if you are using lead-based solder; nearly all of the components we use now are lead-free. ("Tinning" that included lead used to be routinely used on component leads but such parts are rare now.)

On Sat, Dec 11, 2021 at 3:03 PM R. Tyson via <tysons2=[email protected]> wrote:
Can it be done ? I have a couple of those cheap Chinese RF amps. One is working well and that came with good quality IRF530n MOSFETS.? The other one has dicey MOSFETS were they have been ground down to remove any visible information. I have a good supply of Vishay 510's and wondered if I could do a straight swap. Haven't looked at the data sheets yet but wondered if anyone knows for sure or has tried it. Good quality 530n's seem to be a bit hard to get hold of.

Reg???????????????????????? G4NFR

 

On Sat, Dec 11, 2021 at 10:55 PM, Fred Spinner wrote:
If anything, the 510s have lower gate capacitance.? The are a little less robust in their designed use, but might be more robust in RF service. You really can't damage anything else anyway and they should work.? Go for it...?
That's the attitude I like??? >:-)

What's to lose... I have plenty of good quality 510's and can stand that funny burning smell or loud bang?? >:-)

Reg?????????????? G4NFR
 

On Sun, Dec 12, 2021 at 09:11 AM, Shirley Dulcey KE1L wrote:
The reason you might have?come up empty when searching for them is that you didn't include PBF in the part number.
Thanks for that, it is a very good point. I didn't attach PBF so that would be why the suppliers were showing "obsolete no stock".
I learn something every day???????? >:-)

Reg?????????????? G4NFR
 

The class? A test results in SIM were done at? Vcc 14 V not? 24 V as per graphic? - I did some later? fun stuff at 24 V to see what sort of power out was predicted at increased Vcc with? 7 Mhz? and? IRF 510.? NB I had to turn the? bias down somewhat to get back in? Id? 400mA target range.? ?Remember? LTspice is a generic Spice simulator and has no special? RF functionality .? ?TEF?
 

I've blown up a few IRF510s in my day and I am still here.?

Fred W0FMS?

On Sun, Dec 12, 2021, 1:13 PM Timothy Fidler <engstr@...> wrote:
The class? A test results in SIM were done at? Vcc 14 V not? 24 V as per graphic? - I did some later? fun stuff at 24 V to see what sort of power out was predicted at increased Vcc with? 7 Mhz? and? IRF 510.? NB I had to turn the? bias down somewhat to get back in? Id? 400mA target range.? ?Remember? LTspice is a generic Spice simulator and has no special? RF functionality .? ?TEF?

 

510s are hardy bits. 24v is easy peasy under one absolute non-negotiable term¡ª get rid of the heat. ?Did I mention the heat problem?

I¡¯ve put 48v to the 510s, and like Frankenstein, they came alive. Terrifyingly alive. Briefly. My favorite amateur radio accessory is a fire extinguisher.?

The caps and toroids may also heat and bust a gut. ?These are ¡°exciting events¡± and weirdly thrilling in a way you shouldn¡¯t discuss in public.?

Don
MOSFET vs KM4UDX
 

On Mon, Dec 13, 2021 at 05:26 AM, Don - KM4UDX wrote:
I¡¯ve put 48v to the 510s, and like Frankenstein, they came alive. Terrifyingly alive. Briefly. My favorite amateur radio accessory is a fire extinguisher.?
That's just a great tale Don.????? >:-)

Thanks for that??????? >:-)

Just finished a 50w amp kit for 30m that is going to go with my recently built 30m QCX+. Both work well but I did stay within the recommended voltages.....??? guess I'm a wimp??????? >:-)

Reg???????????????????? G4NFR

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