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Oddball transitors.
- Thread starter Staybolt
- Start date
Good grief. I hope you do not need help eating, finding water, toilet paper, car tires etc!!! Even though I know where to find these parts I decided to pretend like I had never bought a transistor in my life. So I put into google : "MRF455a for sale". It took 0.27 seconds. I found the links I listed on the first page! Come on man up and do a little bit of research for yourself.
If you can use a smart phone or turn a PC on you can use google. Even Stephen Hawking can use google and he is horribly handicapped. My Mother in law is 70 years old and even she can do this much! It is one thing to seek out specialized knowledge from those with the skills quite another though to not be able to shop at the retail level for parts! I prob. expect to much from fellow men. Not being able to do this much is as bad as older people that can not operate a fuel pump.
My father inlaw is a quadriplegic from a farming accident and he has been back to Africa twice since the accident to hunt. He hunts year round from his wheelchair varmints, deer and bear. He mows his yard on a diesel John Deer modified for him with a lift to get him into the tractor and hydraulic hand controls.
All I am saying is try first when it is something not at all skill or knowledge based like shopping retail online for common parts! If you try and have no luck I would never fault a person that at least tries in fact I would praise someone who tried and failed and needed help and was willing and able to ask for it!
https://www.mouser.com/ProductDetai...HrNF3nCFJ_Gh0RAcbefi89LPtVFwcomgaAog2EALw_wcB
https://www.rfparts.com/rftransistors/transistor-mrfsrfm/rftransistors-mrf-400/mrf455-mot.html
https://parts.io/detail/10941498/MRF455A
If you can use a smart phone or turn a PC on you can use google. Even Stephen Hawking can use google and he is horribly handicapped. My Mother in law is 70 years old and even she can do this much! It is one thing to seek out specialized knowledge from those with the skills quite another though to not be able to shop at the retail level for parts! I prob. expect to much from fellow men. Not being able to do this much is as bad as older people that can not operate a fuel pump.
My father inlaw is a quadriplegic from a farming accident and he has been back to Africa twice since the accident to hunt. He hunts year round from his wheelchair varmints, deer and bear. He mows his yard on a diesel John Deer modified for him with a lift to get him into the tractor and hydraulic hand controls.
All I am saying is try first when it is something not at all skill or knowledge based like shopping retail online for common parts! If you try and have no luck I would never fault a person that at least tries in fact I would praise someone who tried and failed and needed help and was willing and able to ask for it!
https://www.mouser.com/ProductDetai...HrNF3nCFJ_Gh0RAcbefi89LPtVFwcomgaAog2EALw_wcB
https://www.rfparts.com/rftransistors/transistor-mrfsrfm/rftransistors-mrf-400/mrf455-mot.html
https://parts.io/detail/10941498/MRF455A
Or.... maybe he figured he'd ask people on the forum first to see if he could get a set of used pulls before going elsewhere. I would have done the exact same thing. In fact, I have sold 2 good pairs of stud mount finals to people here on the forum, simply because they asked here first. If I had another set, Staybolt would have the opportunity to buy them.
~Cheers~
~Cheers~
Thats kinda what i was looking for until onelasttime blasted me for just asking. Screw him. He needs to go back to qrz with the rest of the jerks.
Mouser does indeed list the flange-mount MRF455. Not the same thing. A casual inspection of the circuit board will reveal that there is no way to make that part fit the circuit board. Not without gouging notches for the MRF455 mount flange.
The stud-mounted "A" part simply drops into the hole in the pc board.
But Mouser doesn't have that one.
RF Parts also lists the "NON-A" part. They had some 445A parts for years. The price crept up year by year, but now they no longer list it.
About that parts.io link above.
The devil is in the fine print. Says this to the right of the box with the specs.
" has no stock or pricing available"
And when you click on the hyperlink that follows it, to "Search for in-stock components similar", you get a page that says "No results found" at the top.
Suppliers list things they don't really have because it drives traffic to them. I suspect that every part number ever marketed by a large corporation will turn up links from a web search. But not necessarily a link to where you can buy it.
Thanks for the hyperlinks, but a web link to someone who can actually sell you the thing would interest me a lot more.
73
The stud-mounted "A" part simply drops into the hole in the pc board.
But Mouser doesn't have that one.
RF Parts also lists the "NON-A" part. They had some 445A parts for years. The price crept up year by year, but now they no longer list it.
About that parts.io link above.
The devil is in the fine print. Says this to the right of the box with the specs.
" has no stock or pricing available"
And when you click on the hyperlink that follows it, to "Search for in-stock components similar", you get a page that says "No results found" at the top.
Suppliers list things they don't really have because it drives traffic to them. I suspect that every part number ever marketed by a large corporation will turn up links from a web search. But not necessarily a link to where you can buy it.
Thanks for the hyperlinks, but a web link to someone who can actually sell you the thing would interest me a lot more.
73
Last edited:
Yes i know. I sent him a nice message telling him where to go and what to do.
Depending on board layout releaving the area for the flange and screw access may be a pain. This is the only reason to use the stud package. Electrically the non stud package is the same. Thermally the packages are different. correctly installed the stud mount package was to be a mild press fit in a coutersink with a nut/stud to retain it. I've only seen this spec used once i a Mill-Spec application. Still the flange mount, correctly installed has more surface area for dissipation. The stud mount has more possible area closer to the junction if countersunk.
Short answer ? mod for the flange mount BJT.
Short answer ? mod for the flange mount BJT.
NTE bought them and printed their own "cross-reference" number on parts for literally thousands of different components. When NTE can't get them any more they drop it from their catalog. The cross-reference guides live on long after NTE stops packaging a particular part and no longer has it available.
When the original-manufacturer's numbered parts become scarce, the NTE cross-reference "substitute" parts usually dry up as well.
As a rule, the NTE part will be the genuine Motorola part underneath the new number.
73
When the original-manufacturer's numbered parts become scarce, the NTE cross-reference "substitute" parts usually dry up as well.
As a rule, the NTE part will be the genuine Motorola part underneath the new number.
73
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