ICL7611BCSA+T

Overview

The ICL7611BCSA+T is a single-channel monolithic CMOS operational amplifier from the ICL761X–ICL764X family. It features an input bias current of 1pA typical and 50pA maximum at +25°C, with a supply voltage range of ±1V to ±8V or 2V to 16V single supply. The device offers pin-selectable quiescent currents of 10μA, 100μA, or 1000μA for the single amplifier configuration. It provides rail-to-rail output swing within millivolts of the supply rails and operates over a commercial temperature range of 0°C to +70°C.

Feature Summary

• Ultra-low input bias current of 1pA typical ensures optimal performance with very high source impedances.
• Pin-selectable quiescent current allows optimization between power consumption and bandwidth.
• CMOS outputs swing to within millivolts of the supply voltages for maximum dynamic range.
• Industry-standard pinouts facilitate direct replacement in existing designs.

Applications

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

Procurement Notes

Verify the specific suffix '+T' indicates tape and reel packaging when sourcing this component. Confirm that the 'BC' designation corresponds to the required 5mV offset voltage specification and the C series temperature range. Ensure the ordering information matches the manufacturer's current datasheet revision to avoid discrepancies in package dimensions or electrical characteristics.

Selection Notes

Select this part when ultra-low input bias current is critical for maintaining accuracy with high-impedance sources. The programmable quiescent current feature allows designers to balance low power consumption against required slew rate and bandwidth. Verify that the application does not require external compensation, as the ICL7611 is internally compensated for unity-gain stability.

Part Context

This component belongs to the ICL761X–ICL764X family of precision operational amplifiers manufactured by Analog Devices Inc./Maxim Integrated. The family includes single, dual, triple, and quad configurations sharing similar core architecture. The ICL7611 specifically denotes the single-channel variant designed for applications requiring minimal input current draw and low power operation across a wide supply voltage range.

Replacement Considerations

Direct replacements include other variants within the ICL761X–ICL764X family such as the ICL7611ACSA or ICL7611DCSA, provided they meet the specific offset voltage and temperature requirements. Cross-manufacturer second-source parts are available but must be verified for pin compatibility and electrical parameter alignment.