ICL7611ACSA

Overview

The ICL7611ACSA is a single-channel monolithic CMOS operational amplifier from the ICL761X family, housed in an 8-pin Slim Small Outline package. It operates within a supply voltage range of ±1V to ±8V or 2V to 16V single supply. Key electrical characteristics include a typical input bias current of 1pA, a unity-gain bandwidth of 0.044MHz at 10μA quiescent current, and an input offset voltage maximum of 2mV at +25°C. The device supports programmable quiescent currents of 10μA, 100μA, or 1000μA via the IQ pin.

Feature Summary

• Ultra-low input bias current suitable for high-impedance sources
• Programmable quiescent current for power-performance trade-offs
• Rail-to-rail output swing capability with milli-volt headroom
• Internal frequency compensation for stable unity-gain operation

Applications

• Long time constant integrators
• Picoammeters
• Low droop rate sample/hold amplifiers
• pH meters and photodiode amplifiers

Procurement Notes

Verify the specific suffix 'ACSA' confirms the 8-pin Slim SOIC package and commercial temperature range (0°C to +70°C). Confirm that the 'A' grade specifies the required input offset voltage limits. Ensure the ordering code matches the manufacturer's current nomenclature as legacy Maxim Integrated part numbers may have updated designations under Analog Devices.

Selection Notes

Select this component when ultra-low input bias current is critical for signal integrity. The programmable IQ pin allows optimization between low power consumption and higher slew rates. Verify that the application requires internal compensation; if external compensation is needed, consider the ICL7614 variant instead. Ensure the load impedance allows for the desired rail-to-rail output swing performance.

Part Context

This device belongs to the ICL761X–ICL764X family of monolithic CMOS op amps designed for low-power applications. The family combines ultra-low input current with wide supply voltage flexibility. The ICL7611 specifically denotes the single-channel configuration within this series, offering industry-standard pinouts for easy integration into existing designs requiring minimal quiescent power.

Replacement Considerations

The datasheet identifies the ICL7611ACPA as a pin-for-pin second source alternative. Other family members like the ICL7611BCSA offer different offset voltage grades but maintain identical pinouts.