 LM741 Operational Amplifier by Texas Instruments

Manufacturer's data sheet, revision D, October 2015.

Section 6.5, p. 5, gives typical input impedance $2\mathrm{M\Omega }$ at $25^{\circ }\mathrm{C}$ and typical large-signal voltage gain $200V/mV$. Section 7.4.2 describes closed-loop feedback. These are device-specific examples for interpreting a real operational amplifier.