RM-3 MOSFET TRANSISTOR

[NZ8N]

ERF9530 is a rebranded TO-3P MOSFET, similar in size to the power regulator on the side wall of a Galaxy or other similar radio. It will probably be too big to fit in place of an RM3 transistor.
IRF9530 is a TO-220P (final sized) MOSFET, has lesser heat dissipation then the above.

By doing a deep dive on the web, a German company web page says RM3 is about the same as an MS1307.
https://www.mwf-service.com/shop/mos-rm3-hf-endstufen-mosfet-max-30-mhz.html

Another site says MS1307 is equivalent to an IRF530 or BUZ20.
http://www.datasheetcafe.com/ms1307-datasheet-mosfet/

Going on the International Rectifier web site, their PDF listings for IRF510-IRF540 show

http://www.irf.com/product-info/datasheets/data/irf530.pdf
IRF510 - Id - 5.6A - Ciss - 180 pF (used in some experimental QRP ham transceivers)
IRF520 - Id - 9.2A - Ciss - 360 pF
IRF530 - Id - 14A - Ciss - 670 pF
IRF540 - Id - 28A - Ciss - 1700 pF
Id is Drain Current, Ciss is Input (Gate) Capacitance.

 

[443]

This is a wild discussion. I never bothered with the RM3 or any of the RM amplifiers period, but now you got me interested. These are $68 and will output 100W? Where do you buy one for $68? Sounds like a neat experiment. IRF9530 is a P Channel Mosfet in TO-220B package, I would say, that's not the right part.

Input capacitance may not matter as much everyone thinks, seeing as how I know from experience you can replace the ERF 7530 (of whatever they call the TO-3P) one with a Fairchild FDA24N40F mosfet which has a "will not work" gate capacitance if you listen to the experts, but they are wrong it does work, I did it 10 years ago, only told a few people, but apparently recently the word has gotten out. I just happened to have those Fairchild parts in the parts bin for my amplifier repair shop (audio amplifiers) as many of the 2KW+ car stereo amps (Class D) were using originally a IRFP360LC but the price was of course high, so manufacturers started using the Fairchild equivalent, the FDA24N40F, with great success. Turns out they work in RF Amplifiers too, by some miracle that I cannot explain, I just know they work.

 

[443]

Something I never got around to experimenting with was what would the FDA24N40F swapped FET (Palomar FET 450HD in this case) amplifier do with 24V or even 50V supply voltage? The FDA24N40F is a 400V mosfet. Someone try it and share. The parts are cheap, who cares if they blow up, $10 or less for a whole new set of 4. I don't have that amplifier anymore, sold it many years ago.

 

[1KT001]

Sono molto interessato. FDA24N40F per 16 unità quanti Watt può rendere?

Grazie!

 

[long night]

Sono molto interessato. FDA24N40F per 16 unità quanti Watt può rendere?

Grazie!

I do not speak Italian, but Thank You for responding!!

 

[1KT001]

I am very interested. FDA24N40F for 16 units how many Watts can it make?

How often can they work starting from 160 Mt.?

Thanks!

 

[eltecom]

O "RM3", também conhecido como 2N6045, é um transistor de potência NPN de 75 watts/100v. O mistério por trás do RM3 é que eles usam todos os transistores que conseguem em preços a granel e cruzam o estande da fábrica e remarcam os transistores, internamente, com o número RM3. Nem todos os transistores RM3 que vêm da RM Itália são iguais, existem cerca de 15 variações diferentes que foram usadas ao longo dos anos.

amigo....o 2n6045 é pnp e nao npn!!!!! e as kl203 usam mosfets!!

 

[Dr_DX]

FYI

Comparing a RM3 currently sold on Ebay:

Original Genuine RM Italy MOSFET Transistors #RM3 Amplifier RF Outputs | eBay

This item is for one new genuine RM Italy, type RM3, MOSFET, RF output transistor for RM Italy amplifiers. If you have a problem with a transistor's ID being ground off, DON'T ORDER THESE! There is a lot of speculation floating around the internet but all I have investigated turned out to be...

www.ebay.com

looks exactly like a genuine Vishay IRF520

5pcs IRF520 NEW Genuine VISHAY TO-220 | eBay

It's better to wear an antistatic wrist strap or wash your hands before welding and installation. for your parcel.

www.ebay.com

The IRF530 looks a little different.

 

[smdportugal]

I´m glad to get here and i can say that the main problem is if you use same ID and Voltage limit similar transistors you need to look at the GAte Capacitance and the VT of the transistor , its common that you buy a set of a dealer with some specs and when you buy again the specs will be diferent . please check that the Gate Capacitance is About 1nF , the VT about 1-1,8 Volts and the RDS-on 0,18 Ohms . If you mix diferent transistors the push-pull will be descalibrated and probably will raise temperature and burn .
Hope that helps .

Nuno Aragão - SMD Portugal

 

[armyzaha77]

Hello , i am new on this forum and i have a dilema...if it is supposed that the RT1 Ranger mosfet same as IRFZ24N could it be that the IRFZ44N same as the RT5 ranger Mosfet?