LT Spice library IRFZ44, Centered tapped Transformer and PV cell

On 2 Dec 2019 13:08:03 -0800, Winfield Hill <winfieldhill@yahoo.com>
wrote:

>John Larkin wrote...
>>
>> There can be huge variations between different manufacturers
>> of a given part number.  I've seen same-numbered power
>> transistors from different sources with a 4:1 chip area
>> difference.  The small ones were fast and fragile.
>
> That's too often true.  According to Octopart, only
> IRF (now Infineon) makes the IRFZ44 family of parts.

In the US at least, you can't copyright a part number. Anybody can
sell an LM317.

-- 

John Larkin         Highland Technology, Inc
picosecond timing   precision measurement 

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com

John Larkin wrote...
>
> On 2 Dec 2019, Winfield Hill wrote:
>
>> John Larkin wrote...
>>>
>>> There can be huge variations between different manufacturers
>>> of a given part number.  I've seen same-numbered power
>>> transistors from different sources with a 4:1 chip area
>>> difference.  The small ones were fast and fragile.
>>
>> That's too often true.  According to Octopart, only
>> IRF (now Infineon) makes the IRFZ44 family of parts.
>
> In the US at least, you can't copyright a part number.
> Anybody can sell an LM317.

 Right.  And there are many manufacturers.

 I checked IRFZ44 on LCSC, all they offered was from IRF.
 But they offered LM317 from 11 different manufacturers,
 or from 9, if I restricted it to a TO-220 package.  The
 lowest price was 6.8 cents, qty 100, compared to 25 cents
 for the cheapest "standard" part from a U.S. distributor.
 Their lowest price for an Infineon IRFZ44N was 21 cents,
 about 3x below any of the U.S. distributors.
 


-- 
 Thanks,
    - Win

On 2 Dec 2019 13:53:44 -0800, Winfield Hill <winfieldhill@yahoo.com>
wrote:

>John Larkin wrote...
>>
>> On 2 Dec 2019, Winfield Hill wrote:
>>
>>> John Larkin wrote...
>>>>
>>>> There can be huge variations between different manufacturers
>>>> of a given part number.  I've seen same-numbered power
>>>> transistors from different sources with a 4:1 chip area
>>>> difference.  The small ones were fast and fragile.
>>>
>>> That's too often true.  According to Octopart, only
>>> IRF (now Infineon) makes the IRFZ44 family of parts.
>>
>> In the US at least, you can't copyright a part number.
>> Anybody can sell an LM317.
>
> Right.  And there are many manufacturers.
>
> I checked IRFZ44 on LCSC, all they offered was from IRF.
> But they offered LM317 from 11 different manufacturers,
> or from 9, if I restricted it to a TO-220 package.  The
> lowest price was 6.8 cents, qty 100, compared to 25 cents
> for the cheapest "standard" part from a U.S. distributor.
> Their lowest price for an Infineon IRFZ44N was 21 cents,
> about 3x below any of the U.S. distributors.
> 

What is weird is that I can buy a board from China, with say an FPGA
or a uP, with other parts, like a DRAM and connectors, qty 1, shipped,
for less than I can buy just the main part here. 

Are they getting better pricing than we are? Are these people
piggy-backing on some giant OEM orders?

-- 

John Larkin         Highland Technology, Inc
picosecond timing   precision measurement 

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com

mandag den 2. december 2019 kl. 23.47.06 UTC+1 skrev John Larkin:
> On 2 Dec 2019 13:53:44 -0800, Winfield Hill <winfieldhill@yahoo.com>
> wrote:
> 
> >John Larkin wrote...
> >>
> >> On 2 Dec 2019, Winfield Hill wrote:
> >>
> >>> John Larkin wrote...
> >>>>
> >>>> There can be huge variations between different manufacturers
> >>>> of a given part number.  I've seen same-numbered power
> >>>> transistors from different sources with a 4:1 chip area
> >>>> difference.  The small ones were fast and fragile.
> >>>
> >>> That's too often true.  According to Octopart, only
> >>> IRF (now Infineon) makes the IRFZ44 family of parts.
> >>
> >> In the US at least, you can't copyright a part number.
> >> Anybody can sell an LM317.
> >
> > Right.  And there are many manufacturers.
> >
> > I checked IRFZ44 on LCSC, all they offered was from IRF.
> > But they offered LM317 from 11 different manufacturers,
> > or from 9, if I restricted it to a TO-220 package.  The
> > lowest price was 6.8 cents, qty 100, compared to 25 cents
> > for the cheapest "standard" part from a U.S. distributor.
> > Their lowest price for an Infineon IRFZ44N was 21 cents,
> > about 3x below any of the U.S. distributors.
> > 
> 
> What is weird is that I can buy a board from China, with say an FPGA
> or a uP, with other parts, like a DRAM and connectors, qty 1, shipped,
> for less than I can buy just the main part here. 
> 
> Are they getting better pricing than we are? Are these people
> piggy-backing on some giant OEM orders?

look at some of the prices on LCSC, and afaiu the prices are lower on the Chinese version of LCSC