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LT Spice library IRFZ44, Centered tapped Transformer and PV cell

Started by Qasim khan December 2, 2019
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