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Absolute Maximum Ratings. The “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. The device should . Fairchild µA description. The µA is a general-purpose operational amplifier featuring offset-voltage null capability. The high common-mode input voltage. uA Frequency-compensated operational amplifier. Other names for this product: , A, uA,. Courtesy/Thanks to: Fairchild Semiconductors.

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Possibly the best lab experiment I did as an EE undergraduate was to view a under an electron microscope, as I recall as SEM but with the beam switched off. It saves space to use a current mirror instead of a resistor whenever possible.

It is possible to operate the on a single rail supply also. If you get a chance to revisit it, it’d be nice to update them – tiny electronic parts warrant a closer look. Underneath the photo fairrchild a cross-section drawing showing approximately how the transistor is constructed. If you’ve looked at analog IC block diagrams, you may have seen the above symbols for a current source and wondered what a current source is and why you’d use one.

This is why short circuit protection is provided. Die for the op amp, showing the main functional units. We’ve got a winner! The internal blocks of the The internal circuitry of the op amp has been explained in many places [11]so I’ll just give a brief description of the main blocks. They consist of a circular emitter Psurrounded by a ring shaped base Nwhich is surrounded by the collector P.


Courtesy of Dave Fullagar.

File:Fairchild uA741 opamp 6920.jpg

An interesting thing about resistors on planar semiconductors: Many integrated circuits will overheat and self-destruct if fzirchild accidentally short circuit an output.

The steady state response does not depend on time and transient response is time invariant.

And orientation might matter too, so try to match that. Studying data sheet schematics, I found that chips can be be divided into two categories based on the circuits for the second stage and output stage. Some more detailed discussions are here and here. Views View Edit History. In addition to the very large size difference, fzirchild silicon doping is different. The maximum ratings of the IC are specified faircihld parameters like supply voltage, input and differential input voltages, storage and operating temeprature ranges, soldering pin temperatures, and output short circuit duration.

This allows a much higher resistance for a given size. Transistor matching is very important: Therefore, its absolute value is listed in the datasheet.

The large resistor snaking around the upper middle of the IC controls the initial current. This can be found out by connecting a 10K POT between the pin 1 negative offset null and pin 5 positive offset null and the wiper of the port should be connected to the ground.

Introduction to Op-Amp,Features,Characteristics,Pin configuration

But if something like that ia741 done accidentally, the current flowing through will have a high value. The maximum input offset current value for IC is nA. The slew rate of an op-amp is always fixed. If you’re interested in how analog chips work, I strongly recommend you take a look at Designing Analog Chips. The two input pins are connected to the differential amplifier, which is based on the differential pair described above.


For instance, the base current is small but not zero. So fairhcild could see the input stages gradually getting lighter and darker as the charge on them accumulated and dissipated, while the output stages would flip back and forth between light and dark as they were saturating. Dangerous concentrated acid is required to dissolve the epoxy package and see the die. This is a uA operational amplifier opamp made by Fairchild Semiconductor in during the Apollo 11 program.

File:Fairchild uA opamp jpg – Wikimedia Commons

Your email address will not be published. The capacitor blocks these oscillations. But some ICs, such as theare available in metal cans ja741 can be easily opened with a hacksaw.

The result is a transistor will have poor gain if the collector and emitter are swapped. The op amp, packaged in a TO metal can. When you look closely at the silicon die in the center of the image there is a relatively large metal area which is the 30pF capacitor required compensate the amplifier.

But if it goes too high, the feedback circuit pulls it lower. The op amp is one of the most famous and popular ICs [1] with hundreds of millions sold since its invention in by famous IC designer Dave Fullagar.