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NJM4580 to OPA2228, which one exactly?
NJM4580 to OPA2228, which one exactly?
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Old 5th November 2008, 09:02 PM   #1
minnie is offline minnie  Australia
diyAudio Member
Join Date: Nov 2008
Default NJM4580 to OPA2228, which one exactly?

I'm looking into changing the x10 NJM4580 op amps in a Behringer Mic Pre I have to Burr-Brown (now Texas Instruments) OPA228's.

Aside from the original IC's being glued on it all looks fairly do-able with my somewhat limited level of electronics knowledge.

Please forgive my ignorance, but I'm trying to find out which ti OPA2228 exactly, they come in a few different ways. P, U, UA etc'

Here is the original chips datasheet

and here is the datasheet for the 2228

If anyone has to time to let me know I''d be off and running.
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Old 6th November 2008, 12:50 AM   #2
dietcoke is offline dietcoke  United States
diyAudio Member
Join Date: Apr 2006
Location: United States NY
When you refer to the NM4580 being glued on, do you mean its a surface mount chip soldered on? ie: is it about 7mm sized?

If you dont have good equipment and skills, you'll probably end up ripping/delaminating the circuit board traces off the board.

Also, do you know what purpose the njm4580's serve? The opa2228 although nice isnt unity gain stable. It needs a gain of at least 5. You would have better luck with the opa2227.

opa2228P = dip package
opa2228ua = smd [surface mount] size
opa2228u = same as the opa2228ua except with better tolerance.
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Old 8th November 2008, 12:14 AM   #3
minnie is offline minnie  Australia
diyAudio Member
Join Date: Nov 2008
thanks for that.

No, I don't have schematics so don't know what each chip is doing.
I will take a another look but from memory it was surface mount chips, yep about 7mm.

This unit is rarely set below 5 input gain wise, is that what you mean?
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