741 Opamp - LM741 Opamp Circuits

SupplyFrame search engine has datasheets and spec's on 741's from many manufacturers.  See the LM741 datasheet and specs.

The 741 is the ancestor of many of today's operational amplifiers (amplifiers on a chip). New designs are faster and lower noise but it still a good general purpose device.  The 741 is compensated (its frequency response is tailored) so that it doesn't produce unwanted spurious oscillations in most situations. The 741 is easy to use but has poor speed/gain performance compared to more modern op-amps.

 

The 741's usual 8-pin ‘DIL’ (Dual In Line) or ‘DIP’ (Dual Inline Package) is so popular that many other competing op-amps have adopted the same package/pinout.  The result is a variety of ‘drop in’ replacements or upgrades for 741 variants. These days there is a large family of 741 type devices, made by various manufacturers.

The LM741 is a very popular variant of the 741.  Check out many LM741 out there today.

The values given below are ‘typical’ for an ordinary 741:

Typical values of Basic Parameters:

Rail voltages :  +/- 15V dc (+/- 5V min,  +/- 18V max)
Input impedance: Around 2MegOhms
Low Frequency voltage gain: approx 200,000
Input bias current: 80nA
Slew rate: 0.5V per microsecond
Maximum output current: 20mA
Recommended output load: not less than 2kilOhms

Note that, due to the frequency compensation, the 741's voltage gain falls rapidly with increasing signal frequency. Typically down to 1000 at 1kHz, 100 at 10kHz, and unity at about 1MHz. To make this easy to remember we can say that the 741 has a gain-bandwidth product of around one million (i.e. 1 MHz as the units of frequency are Hz).

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