[sdiy] AD821

[Ian Fritz]

At 10:47 PM 8/17/05, Kevin Haywood wrote:
>fellow list members,
>
>what the @%#* was an AD821?  i can find *no* information about it anywhere 
>- not even a datasheet to help me figure out what an appropriate 
>substitute might be.
>
>anyone have 20 or so NOS that they wanna sell?  ; >
>
>kevin

Kevin --

Perhaps if you told us what your requirements are we could help you find a 
substitute.  Probably the MAT03 would work, unless there is some special 
characteristic of the AD821 you need.  The inexpensive Japanese pairs would 
also possibly be OK.

And I do have the data sheet. Just let me know what parameters you need to 
know. The main specs are Vbe matching to 1 mV, Ib matching to 10 nA, hFE 
150-600, breakdown 45 V, noise figure 3 dB.

   Ian