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tech / sci.electronics.design / Re: Onsemi RF transistors

SubjectAuthor
* Onsemi RF transistorsJohn Larkin
+- Re: Onsemi RF transistorsbitrex
+* Re: Onsemi RF transistorsJohn S
|`* Re: Onsemi RF transistorsJohn Larkin
| `- Re: Onsemi RF transistorsJohn S
+- Re: Onsemi RF transistorsPhil Hobbs
`- Re: Onsemi RF transistorsMichael Terrell

1
Onsemi RF transistors

<gb53bi1b8qa8krqata5r9ibdpug9to9hjl@4ax.com>

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From: jjlar...@highlandtechnology.com (John Larkin)
Newsgroups: sci.electronics.design
Subject: Onsemi RF transistors
Date: Fri, 14 Jul 2023 11:36:33 -0700
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 by: John Larkin - Fri, 14 Jul 2023 18:36 UTC

https://www.onsemi.com/products/discrete-power-modules/rf-transistors#products=fnN0YXR1c352YWx1ZX4yfiF+TGFzdCBTaGlwbWVudHN+IX5PYnNvbGV0ZX4=

Only one PNP sadly, and slow.

Re: Onsemi RF transistors

<IgisM.369589$t9v6.278684@fx15.iad>

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 by: bitrex - Fri, 14 Jul 2023 20:31 UTC

On 7/14/2023 2:36 PM, John Larkin wrote:
>
>
> https://www.onsemi.com/products/discrete-power-modules/rf-transistors#products=fnN0YXR1c352YWx1ZX4yfiF+TGFzdCBTaGlwbWVudHN+IX5PYnNvbGV0ZX4=
>
> Only one PNP sadly, and slow.
>

Looks like Central Semiconductor will still make the 2N4957 if you make
it worth their while:

<https://www.mouser.com/ProductDetail/Central-Semiconductor/CM4957-TIN-LEAD?qs=l7cgNqFNU1hSYreJzhif6w%3D%3D>

We could do a newsgroup group-buy! Put me down for...er, how much do you
think they'll want per unit, again?

Re: Onsemi RF transistors

<u8scke$1gkh$1@dont-email.me>

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From: Soph...@invalid.org (John S)
Newsgroups: sci.electronics.design
Subject: Re: Onsemi RF transistors
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 by: John S - Fri, 14 Jul 2023 20:53 UTC

On 7/14/2023 1:36 PM, John Larkin wrote:
>
>
> https://www.onsemi.com/products/discrete-power-modules/rf-transistors#products=fnN0YXR1c352YWx1ZX4yfiF+TGFzdCBTaGlwbWVudHN+IX5PYnNvbGV0ZX4=
>
> Only one PNP sadly, and slow.
>

Yeah, but they can handle 20V and 50mA continuously.

Re: Onsemi RF transistors

<k9f3bilpfuuquhovrb5bua4b6knk3rqqn1@4ax.com>

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From: jjlar...@highlandtechnology.com (John Larkin)
Newsgroups: sci.electronics.design
Subject: Re: Onsemi RF transistors
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 by: John Larkin - Fri, 14 Jul 2023 21:26 UTC

On Fri, 14 Jul 2023 15:53:26 -0500, John S <Sophi.2@invalid.org>
wrote:

>On 7/14/2023 1:36 PM, John Larkin wrote:
>>
>>
>> https://www.onsemi.com/products/discrete-power-modules/rf-transistors#products=fnN0YXR1c352YWx1ZX4yfiF+TGFzdCBTaGlwbWVudHN+IX5PYnNvbGV0ZX4=
>>
>> Only one PNP sadly, and slow.
>>
>
>Yeah, but they can handle 20V and 50mA continuously.

Not at the same time.

Re: Onsemi RF transistors

<u8u9t9$dhan$1@dont-email.me>

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Newsgroups: sci.electronics.design
Subject: Re: Onsemi RF transistors
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 by: John S - Sat, 15 Jul 2023 14:19 UTC

On 7/14/2023 4:26 PM, John Larkin wrote:
> On Fri, 14 Jul 2023 15:53:26 -0500, John S <Sophi.2@invalid.org>
> wrote:
>
>> On 7/14/2023 1:36 PM, John Larkin wrote:
>>>
>>>
>>> https://www.onsemi.com/products/discrete-power-modules/rf-transistors#products=fnN0YXR1c352YWx1ZX4yfiF+TGFzdCBTaGlwbWVudHN+IX5PYnNvbGV0ZX4=
>>>
>>> Only one PNP sadly, and slow.
>>>
>>
>> Yeah, but they can handle 20V and 50mA continuously.
>
> Not at the same time.
>

Of course not. It would be too much to ask of them.

Re: Onsemi RF transistors

<u8udor$duu4$1@dont-email.me>

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From: pcdhSpam...@electrooptical.net (Phil Hobbs)
Newsgroups: sci.electronics.design
Subject: Re: Onsemi RF transistors
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 by: Phil Hobbs - Sat, 15 Jul 2023 15:25 UTC

John Larkin <jjlarkin@highlandtechnology.com> wrote:
>
>
> https://www.onsemi.com/products/discrete-power-modules/rf-transistors#products=fnN0YXR1c352YWx1ZX4yfiF+TGFzdCBTaGlwbWVudHN+IX5PYnNvbGV0ZX4=
>
> Only one PNP sadly, and slow.
>
>

There’s allegedly the NTE2403. It costs $3 and is very thinly stocked, but
is a bit better than the BFT92 overall.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC /
Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics

Re: Onsemi RF transistors

<c1657bc6-c5ab-479f-8fc8-6688b57fbc1en@googlegroups.com>

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Subject: Re: Onsemi RF transistors
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 by: Michael Terrell - Sun, 16 Jul 2023 22:41 UTC

On Friday, July 14, 2023 at 2:36:43 PM UTC-4, John Larkin wrote:
> https://www.onsemi.com/products/discrete-power-modules/rf-transistors#products=fnN0YXR1c352YWx1ZX4yfiF+TGFzdCBTaGlwbWVudHN+IX5PYnNvbGV0ZX4=
>
> Only one PNP sadly, and slow.

Phasecom built a bunch of CATV Head end equipment with PNP RF transistors, rather than invert their AGC voltage and use better NPN transistors. They were some oddball flatpack Japanese design, that popped like flashcubes if lightning hit within a few miles of the headend. I blacklisted them for all new purchases.
Those transistors were around $8 each, unless you bought a reel of 3,000.

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