OPA 129 U through-hole package required

Hello T,

TI has provided op amps in the DIP for decades while the assembly technology has progressed to surface mount packages. The time has come where many of the legacy op amps that have been available in DIP packages are in their final years or being discontinued.

If your application is for a small number of op amps you may be able to get by with a DIP to SOIC adapter. The newer op amp in the surface mount package is soldered to the adapter, and then the adapter pins which fit into the PC board DIP outline is soldered. DIP adapters are available from various manufacturers, and TI has a DIP adapter evaluation module useful for small quantities of devices. You can find it here:

http://www.ti.com/tool/DIP-ADAPTER-EVM?keyMatch=DIP%20ADAPTER&tisearch=Search-EN-everything&usecase=part-number

Replacing the OPA129 electrical characteristics may be difficult because TI does not have a newer, exact replacement; especially, if the ultra-low input bias current of the is a key need in the application. If it isn't, a CMOS op amp such as the OPA191 or OPA192 might be a good replacement. You can take a look at the datasheets here:

http://www.ti.com/lit/ds/symlink/opa191.pdf

http://www.ti.com/lit/ds/symlink/opa192.pdf

If you can explain which parameters are most important for an OPA129 replacement we may be able to point you to an op amp that fits well in the application. If you don't need the full +/-15 V supply, but can use an op amp that uses lower supplies that opens up a number of devices having ultra-low input bias current.

Regards, Thomas

Precision Amplifiers Applications Engineering