ALD1731ASAL

Overview

The ALD1731ASAL is a precision micropower CMOS operational amplifier manufactured by Advanced Linear Devices Inc. It features rail-to-rail input and output voltage ranges, making it suitable for low-voltage single or dual supply systems ranging from +2V to +10V single supply or ±1V to ±5V dual supplies. The device offers an extremely low typical input bias current of 0.01pA and a typical input offset voltage of 35µV. Key electrical specifications include a unity gain bandwidth of 0.7MHz, a slew rate of 0.7V/µs, and a maximum supply current of 250µA at 5V. It operates within a temperature range of 0°C to +70°C and is housed in an 8-pin SOIC package.

Feature Summary

• Rail-to-rail input and output voltage capability allows full signal swing near supply rails.
• Extremely low input bias current minimizes loading effects on high source impedance signals.
• Internally compensated for unity gain stability without requiring external frequency compensation components.
• On-chip offset voltage trimming via EPAD technology eliminates the need for external nulling circuits.

Applications

• Photodiode amplifiers
• Charge integrators
• Picoammeters
• High performance portable instruments
• Data acquisition systems

Procurement Notes

Verify that the specific part number suffix matches the required package type and temperature rating. Confirm RoHS compliance status if lead-free construction is mandatory for the assembly process. Ensure the ordering quantity aligns with standard packaging configurations provided by the manufacturer. Cross-reference the datasheet revision date to confirm the accuracy of the electrical characteristics before finalizing procurement.

Selection Notes

Select this component when designing circuits that require minimal power consumption alongside high input impedance. The rail-to-rail functionality makes it appropriate for battery-operated devices where maximizing dynamic range is critical. Consider the 0.7MHz bandwidth limit when determining suitability for higher frequency signal processing tasks compared to faster operational amplifiers.

Part Context

This device belongs to the ALD1731 family of micropower operational amplifiers produced using enhanced EPAD silicon gate CMOS technology. It serves as a versatile solution for analog applications requiring high precision and low power dissipation. The architecture supports operation across various supply voltages while maintaining compatibility with industry-standard pin configurations found in legacy designs.

Replacement Considerations

The ALD1731SA is a compatible alternative available in the same 8-pin SOIC package format. Verify that the replacement variant meets the specific operating temperature requirements and electrical tolerances defined in the original design specifications.

FAQ

Does the ALD1731ASAL require external frequency compensation?

No, the device is internally compensated for unity gain stability and does not require external frequency compensation components.

What is the typical input bias current specification?

The typical input bias current is specified as 0.01pA at room temperature.