*: Closed-loop gain
There are several ways to categorize op-amps. For example, they are categorized based on: 1) manufacturing process (bipolar and CMOS), 2) power supply type (single-supply and dual-supply), 3) input circuit (differential P-channel MOSFET pair, differential N-channel MOSFET pair, rail-to-rail input, etc.), and 4) electrical characteristics (low input offset, low current consumption, low noise, etc.). Op-amps may also be categorized based on their applications. For details, see the FAQ entry “What types of op-amps are available?”
The following documents also contain related information:
Basics of Operational Amplifiers and Comparators
What types of op-amps are available?
What types of amplifier circuits can be configured using an op-amp?
Why is feedback used in op-amps?
For what applications are op-amps used?
Characteristics of op-amps (What is the ideal op-amp?)
Product web page
Operational Amplifiers and Comparators
Operational Amplifier ICs and Comparator ICs
Power supply type (Dual)
Power supply type (Single/dual)
Input and output full range
Low input offset voltage
Low current consumption