ICL7611DCPA+

Overview

The ICL7611DCPA+ is a single-channel monolithic CMOS operational amplifier from the ICL761X family, manufactured by Analog Devices/Maxim Integrated. It features an ultra-low input bias current of 1pA typical and operates over a wide supply voltage range of ±1V to ±8V or single supplies from 2V to 16V. The device offers programmable quiescent currents of 10µA, 100µA, or 1000µA per amplifier. Key electrical parameters include a unity-gain bandwidth of 44kHz, a slew rate of 16mV/µs at 10µA, and an input offset voltage of 15mV maximum. It is housed in an 8-pin Plastic DIP package with an operating temperature range of 0°C to +70°C.

Feature Summary

• Ultra-low input bias current of 1pA typical for high-impedance source applications
• Programmable quiescent current selection via external pin connection
• CMOS output stage capable of rail-to-rail swing within millivolts of supply voltages
• Internal frequency compensation for stable unity-gain operation

Applications

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

Procurement Notes

Verify the specific suffix 'DCPA+' against the manufacturer's latest datasheet to confirm the exact temperature grade (C Series: 0°C to +70°C) and packaging type (8-Pin Plastic Dip). Ensure compatibility with RoHS directives if required by the application. Cross-reference the ordering information table in the official documentation to validate availability and revision status before finalizing procurement.

Selection Notes

Select this component when low power consumption and minimal input bias current are critical design constraints. The ability to adjust quiescent current allows optimization between bandwidth/slew rate and power dissipation. Verify that the 15mV maximum input offset voltage meets the precision requirements of the signal chain. Consider the 8-pin DIP package constraints for PCB layout and thermal management within the specified commercial temperature range.

Part Context

This part belongs to the ICL761X–ICL764X family of monolithic CMOS operational amplifiers. The family includes single, dual, triple, and quad configurations. The ICL7611 specifically denotes a single-channel amplifier. The 'D' indicates a 15mV maximum input offset voltage, while 'CPA' specifies the 8-pin plastic DIP package and commercial temperature range. This family is designed for applications requiring high input impedance and low power operation.

Replacement Considerations

Direct pin-for-pin replacements within the same family include other ICL7611 variants with different temperature grades or offset specifications, such as ICL7611ACPA or ICL7611BCPA. Ensure the substitute matches the required input offset voltage and operating temperature range. Verify that the replacement maintains the same 8-pin DIP package footprint and electrical characteristics regarding quiescent current programming.