ICL7631ECPE

Overview

The ICL7631ECPE is a triple operational amplifier from the ICL761X–ICL764X family, manufactured by Analog Devices Inc./Maxim Integrated. It utilizes monolithic CMOS technology to provide ultra-low input bias current and low-power operation across wide supply voltage ranges. The device features pin-selectable quiescent currents of 10μA, 100μA, or 1000μA per amplifier, enabling optimization for specific bandwidth and slew rate requirements. It operates from ±1V to ±8V dual supplies or single supplies from 2V to 16V. The unit is housed in a 16-lead Plastic DIP package and supports an operating temperature range of 0°C to +70°C.

Feature Summary

• Ultra-low input bias current of 1pA typical, ensuring minimal loading on high-impedance sources
• Pin-selectable quiescent current settings allowing trade-offs between power consumption and performance speed
• CMOS outputs capable of swinging within millivolts of the supply rails
• High input impedance of 10^12Ω combined with low noise current for precision signal conditioning

Applications

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

Procurement Notes

Verify that the ordering suffix 'E' corresponds to the commercial temperature range (0°C to +70°C) and 'PE' indicates the 16-lead Plastic DIP package as specified in the manufacturer's selection guide. Confirm the part number matches the triple amplifier configuration (ICL7631) rather than single, dual, or quad variants within the same family. Ensure compatibility with the required quiescent current setting circuitry if utilizing the programmable IQ pin.

Selection Notes

Select this component when applications demand extremely low input bias currents and high input impedance, such as in electrometer circuits or sensor interfaces. The triple amplifier configuration allows for cost-effective integration of multiple stages in a single package. Designers must account for the relationship between quiescent current selection and bandwidth; lower current settings reduce power but also decrease slew rate and unity-gain bandwidth. Verify that the load resistance allows the output to swing sufficiently close to the supply rails for the chosen IQ setting.

Part Context

This device belongs to the ICL761X–ICL764X family of monolithic CMOS operational amplifiers. The family includes single, dual, triple, and quad configurations with varying offset voltage grades and compensation options. The ICL7631 specifically provides three amplifiers in one package, sharing common power pins and offering independent quiescent current control for each channel via the IOSET pin.

Replacement Considerations

Check for other members of the ICL76XX family with compatible pinouts and electrical characteristics. Verify that any substitute maintains the required triple amplifier topology and 16-lead Plastic DIP packaging. Ensure the replacement part supports the necessary quiescent current programming and meets the thermal requirements for the intended application environment.