ICL7621DESA-T

Overview

The ICL7621DESA-T is a dual-channel monolithic CMOS operational amplifier from the ICL761X–ICL764X family. It features ultra-low input bias current of 1pA typical and low-power operation with fixed quiescent current settings. The device supports wide supply voltage ranges from ±1V to ±8V or single supplies from 2V to 16V, with rail-to-rail output swing capability. Key electrical parameters include a unity-gain bandwidth of 0.48MHz at 100µA quiescent current, a slew rate of 0.16V/µs, and an input offset voltage of 5mV maximum. It operates within a temperature range of -40°C to +85°C in an 8-pin SOIC package.

Feature Summary

• Ultra-low input bias current of 1pA typical for high-impedance source applications
• Rail-to-rail output swing capability approaching supply voltages
• Wide supply voltage operation supporting both single and dual power sources
• Internally compensated 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 ordering suffix 'T' indicates tape and reel packaging configuration as per manufacturer documentation. Confirm that the 'E' series designation corresponds to the specified industrial temperature range of -40°C to +85°C. Ensure compatibility with the 8-pin Small Outline (SO) package dimensions before integration into existing PCB layouts.

Selection Notes

Select this component when application requirements demand extremely low input bias currents combined with low power consumption. The fixed quiescent current setting simplifies design compared to programmable variants. Verify that the internal compensation meets stability requirements for the intended closed-loop gain configuration without external components.

Part Context

This part belongs to the ICL761X–ICL764X family of general-purpose CMOS operational amplifiers manufactured by Analog Devices Inc./Maxim Integrated. The family includes single, dual, triple, and quad configurations with varying quiescent current options. The ICL7621 specifically provides two independent amplifier channels in a compact surface-mount package suitable for space-constrained designs.

Replacement Considerations

Check for pin-compatible alternatives within the same ICL76xx family such as ICL7621ACSA+ or ICL7621BCSA+. Verify that substitute parts maintain the required input bias current specifications and operating temperature range.