Did you mean OP07? If so the OP07 is a precision opamp with very low offset voltage and current and low voltage noise meant for DC and low frequency "instrumentation" applications requiring large gain while the LM741 is one of the first opamps on the market outdated now and has relatively rarge offset voltage and current. There are much better low cost opamps on the market than the LM741 and even better than the OP07.
Datasheet for the OP07 is here **broken link removed**
The datasheet says that the OP07 has applications in
Wireless Base Station Control Circuits
Optical Network Control Circuits
Instrumentation
Sensors and Controls
Thermocouples
RTDs
Strain Bridges
Shunt Current Measurements
Precision Filters
I agree with ptmsl that LM741 is pretty outdated -- you can easily find better opamps. Just visit National Semiconductor's website **broken link removed** for example. Use the 741 if you have nothing else available to you.
For load cells you will need an opamp with good DC characteristics like the OP07 (even better the OP77) and not a general purpose old design like the 741. Also you dont need a fet input opamp like the LF347 unless your load cell has a very large output resistance (in the Megohm range) but I think load cells have small output resistances around 1K. Any good low offset voltage - large DC open loop gain opamp can work. Most companies like Analog devices, National semiconductors, Linear technologies, Texas etc. have selection guides that will help you decide which is the best opamp for your application. Since you need to amplify a voltage in the millivolt range coming from a low resistance source, input offset voltage offset voltage stability and noise voltage at low frequencies are important to you. Opamps for use as instrumenttion amplifiers are most suitable.
The LF347 is better for AC applications because of the higher slew rate and Gain Bandwidth and for applications with high source resistance because of its low input current but like most FET input opamps its offset voltage is worse and it has less open loop large signal voltage gain. So for low offset DC applications OP07 is much better.
Thanks ptmsl a lot for such a nice bible for Op-Amp. It shoes lot of for Op-Amp. I want to download ebooks from edaboard but it requires more points to download. Can you donate me your points so I will download.