I must have sent this only to Bob.
AFAIK this chip only appears in the RT-IHU V1.1. Eric did not build the RT-IHU so probably not. Zach might. However, he apparently knew it was obsolete so V1.2 has a different but incompatible chip.
73,
Burns Fisher, WB1FJ *AMSAT(R) Engineering -- Flight Software*
On Mon, Dec 11, 2023 at 1:27 PM Jim McCullers via pacsat-dev < pacsat-dev@amsat.org> wrote:
Bummer
In most cases a suffix indicates a minor difference.
Getting more difficult to deal with older components and variations. Try getting a 2N3177, used in almost every linear power supply since the 70s. No longer manufactured and stocks are limited with the expected increase in price. I have several Astron power supplies donated to our local club that need refreshing. At the moment the best source appears to be Astron, who apparently bought a large stock.
Burns, would Eric or Zach have the MAX1556A inventory?
Jim WA4CWI
After looking into this more I see the MAX1556A was specified in the schematic and BOM. The MAX1556 was placed on the board. These two parts work differently WRT to the programming pins D1, D2. If the MAX1556A had been used we would have been fine.
I see no stock not his part at Mouser or Digikey or Newark, or anyone in the US so far. I do see inventory in ASIA. If they will sell a small quantity of say 16 we should be able to swap out the parts. Shipping cost will be $40 to $60.
This part is now Obsolete at Analog Devices.
I think these part was used on earlier AMSAT boards. I would like to know if there is any inventory available before ordering the parts from Asia? We need a minimum of 8 but I would like to have 16 to be sure we get them soldered on the boards.
Bob
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Burns Fisher (AMSAT)