ALD1731SAL

Overview

The ALD1731SAL is a precision micropower CMOS operational amplifier manufactured by Advanced Linear Devices. It features rail-to-rail input and output voltage ranges, making it suitable for single or dual supply systems ranging from +2V to +10V or ±1V to ±5V respectively. The device offers extremely low input bias current of 0.01pA typical and low input offset voltage of 35µV typical. Key electrical specifications include a unity gain bandwidth of 700kHz, a slew rate of 0.7V/µs, and a large signal voltage gain of 100V/mV at ±2.5V. Supply current is typically 180µA at ±2.5V. The component is housed in an 8-pin SOIC package with an exposed pad (EPAD) for thermal management.

Feature Summary

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

Applications

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

Procurement Notes

Verify that the ordering suffix 'L' corresponds to lead-free (RoHS) compliance as specified in the manufacturer's ordering information. Confirm the package type matches the required PCB footprint, specifically the 8-pin Small Outline Plastic Dip (SOIC) with an exposed thermal pad. Ensure static control procedures are followed during handling due to the device's sensitivity to electrostatic discharge.

Selection Notes

Select this component when designing circuits that require high precision with minimal power consumption. The rail-to-rail operation makes it ideal for low-voltage battery-powered applications where maximizing dynamic range is critical. Consider the exposed pad requirement for proper thermal dissipation and grounding. Verify that the source impedance remains within limits compatible with the ultra-low input bias current specifications.

Part Context

The ALD1731 series belongs to Advanced Linear Devices' family of micropower CMOS operational amplifiers. It shares architectural similarities with the ALD1701 but distinguishes itself through enhanced precision features such as factory-trimmed offset voltages and lower input bias currents. The device utilizes an enhanced EPAD silicon gate CMOS process to achieve robust performance in temperature-extreme environments while maintaining compatibility with standard µA741 pin configurations.

Replacement Considerations

The datasheet indicates that the ALD1731A variant is available alongside the standard ALD1731. Users should verify if the specific performance grade of the ALD1731A is required for their application. No other direct substitute part numbers are explicitly listed in the provided documentation.