Somewhat off topic but interesting for all of us. I'm currently looking for precision resistors and here is what I found up to now:
Distributor Resistor type Value Toleranz TC Stability Price
HBE-Shop Y14535K00000V9L 5K 0,005% ± 0,05 ppm/°C to ± 0.005 % at 70 °C, 2000 h at rated power 34,94 €
HBE-Shop Y145320K0000V9L 20k 0,005% ± 0,05 ppm/°C to ± 0.005 % at 70 °C, 2000 h at rated power 37,81 €
HBE-Shop Y00625K00000T0L 5K 0,010% ± 1 ppm/°C ± 0.005 % at 70 °C, 2000 h at rated power 18,44 €
HBE-Shop Y006220K0000T9L 20k 0,010% ± 1 ppm/°C ± 0.005 % at 70 °C, 2000 h at rated power not in stock
HBE-Shop Y07855K00000T9L 5K 0,010% ± 2 ppm/°C to ± 0.005 % at 70 °C, 2000 h at rated power 20,53 €
HBE-Shop Y078520K0000T9L 20k 0,010% ± 2 ppm/°C to ± 0.005 % at 70 °C, 2000 h at rated power 21,14 €
Burster 1142 5k 0,010% ± 2 ppm/°C 0.01% over years 23,13 €
Burster 1142 20k 0,010% ± 2 ppm/°C 0.01% over years 23,13 €
Rohpoint 8G16D 5K 5k 0,100% ± 3 ppm/°C ±35ppm/10,000hours ±50ppm/26,000 hours 4,52 €
Rohpoint 8G16D 20K 20k 0,100% ± 3 ppm/°C ±35ppm/10,000hours ±50ppm/26,000 hours 5,30 €
Rohpoint 8G16A 5K 5k 0,010% ± 3 ppm/°C ±35ppm/10,000hours ±50ppm/26,000 hours 6,80 €
Rohpoint 8G16A 20K 20k 0,010% ± 3 ppm/°C ±35ppm/10,000hours ±50ppm/26,000 hours 7,95 €
The hermetically Vishay types seem to be unobtainium and have long waiting time. Most of the Vishay parts seem to be not in normal stock, a simple of the shelf (these are my words because its standard datasheet value and not custom made) DSMZ divider needs at least 3 months to arrive. Are you guys at Vishay kidding me? For a proof of concept this is much to long and inadmissible. The price is for sure fair:
1-24 pc. 25-49 pc. 50-99 pc.
21,05 € 15,30 € 12,40 €
Someone with other and better resisitor sources out there?