[sdiy] Why are MAT02 and MAT03 so expensive?

[Ian Fritz]

At 11:16 PM 8/24/05, James Patchell wrote:
>Those transistors are very tightly matched...very low in noise...and also 
>have very low emitter bulk resistance...something that you have to pay 
>for...if you really need it.

Absolutely correct.

I just finished figuring out how to make a high-performance discrete 
OTA.  Extremely good matching (< 50 uV) is an absolute necessity.  You have 
to pay for this, either by using the MATs or by selecting a very small 
fraction of less expensive monolithic pairs.