ICL7641BCPD+

Overview

The ICL7641BCPD+ is a quad CMOS operational amplifier manufactured by Analog Devices Inc. (Maxim Integrated). It features four independent amplifiers in a single package, offering ultra-low input bias current of 50 pA and low power consumption with an operating supply current of 15 uA. The device supports a wide supply voltage range from 2V to 16V for single supplies or ±1V to ±8V for dual supplies. Key electrical parameters include a gain-bandwidth product of 44 kHz, a slew rate of 16 mV/us, and an input offset voltage of 5 mV. It utilizes a 14-pin PDIP package.

Feature Summary

• Combines ultra-low input bias current with low-power operation suitable for high-impedance sources
• Features pin-selectable quiescent currents to optimize power consumption versus performance
• CMOS outputs swing to within millivolts of the supply rails for maximum dynamic range

Applications

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

Procurement Notes

Verify component authenticity through authorized distributors as this part may be discontinued. Confirm the specific suffix indicates lead-free compliance and RoHS status. Check for obsolescence notices from Analog Devices. Ensure the 14-pin DIP package matches your PCB footprint requirements before ordering.

Selection Notes

Select this component when ultra-low input bias current is critical for signal integrity. Consider the trade-off between the 15 uA supply current and the 44 kHz bandwidth. Verify that the 5 mV input offset voltage meets your precision requirements. Ensure the supply voltage stays within the specified 2V to 16V range for proper operation.

Part Context

This part belongs to the ICL761X–ICL764X family of monolithic CMOS op amps. The '7641' designation indicates a quad configuration, distinguishing it from single (7611), dual (7621), or triple variants. The 'B' grade specifies tighter electrical tolerances compared to commercial grades, while 'CPD+' denotes the plastic DIP package with lead-free construction.

Replacement Considerations

Check for direct pin-for-pin replacements within the same family, such as other ICL764x variants. Verify if alternative manufacturers offer compatible quad CMOS op amps with similar bias current specifications. Ensure any substitute maintains the required supply voltage range and output swing characteristics.