The LM108 is the same single opamp as an LM308 except the LM108 is more expensive, has a wider temperature range and has better spec's. They are both obsolete. The LM308 has not been made for 12 years. Some versions of the LM108 were made until 2008. They had low bias current for their bipolar transistor inputs and unusual frequency compensation terminals that could be uses as a strobe.