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CA3140 General Purpose Op-Amp IC

The CA3140 is a 4.5MHz, BiMOS Operational Amplifier with MOSFET Input/Bipolar Output that combines the advantages of high voltage PMOS transistors with high voltage bipolar transistors on a single monolithic chip.


CA3140 Pinout Configuration

Pin Number

Pin Name



Offset NULL

Used to set offset voltage if required


Inverting Input (IN-)

The Inverting pin of the Op-Amp


Non- Inverting Input (IN+)

The Non-Inverting Pin of the Op-Amp



Connected to negative rail or ground



Output pin of the Op-Amp



Connected to a positive rail of supply voltage 



This pin can be used for phase compensation or to shut down the output stage.


CA3140 Features and Specifications

  • Supply Voltage: 4V to 36 V
  • Output Current per Channel: 40 mA
  • GBP - Gain Bandwidth Product: 4.5 MHz
  • SR - Slew Rate: 9 V/us
  • CMRR - Common Mode Rejection Ratio: 70 dB
  • Operating Supply Current: 4 mA
  • Voltage Gain dB: 100 dB
  • Very High Input Impedance (ZIN) -1.5TΩ
  • Very Low Input Current (Il) -10pA at ±15V
  • Available in 8-Pin PDIP Package

Note: Complete Technical Details can be found at the CA3140 datasheet given at the end of this page.


CA3140 EquivalentsUA741

Alternatives Audio Amplifiers: LM4871, AD620, IC6283, JRC45558, TL081, LF351N, MC33171N


Where to use the CA3140 IC

CA3140 is a single package Op-Amp that has been widely used by engineers and students for quite a long time now. This Op-Amp can be used for many general purpose applications like Voltage follower, Buffers, Comparators, Amplifiers, Adders and much more. So if you looking for a plain old Op-Amp just for some basic circuit design then this IC might be the right choice for you.


How to use CA3140 IC

CA3140 is very similar to the CA3240 Op Amp. The main difference is that CA3240 has two Op-Amps inside package making to more cost-effective and compact.

One notable unique feature of the CA3140 Op-Amp is that it has two Offset Null pins (pin1 and pin 5). These two pins can be used to correct the offset error of an Op-Amp. That is when the voltage difference between the inverting and no-inverting pins is zero the output voltage of the Op-Amp should also be zero. If not then it is considered as offset error and it can be brought to zero again by providing an offset voltage through the offset pins that would nullify the error.

A test circuit from the CA3140 datasheet is given below.

CA3140 Application Circuit


Applications of CA3140 iC

  • Sample and Hold Amplifiers
  • Peak Detectors
  • Active Filters
  • Comparators
  • Interface in 5V TTL Systems and Other Low Supply Voltage Systems
  • All Standard Operational Amplifier Applications
  • Function Generators


2D-Model of CA3140 IC

Dimensions for the CA3140 IC is given below. These dimensions are for the SOIC package. If you are using different package IC please refer to the CA3140 datasheet.

CA3140 Dimensions

Component Datasheet

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