ALD2701ASAL

Overview

The ALD2701ASAL is a dual monolithic CMOS micropower operational amplifier manufactured by Advanced Linear Devices, Inc. It features rail-to-rail input and output voltage ranges, allowing operation with signals equal to the supply rails. The device operates on single supplies from +2V to +10V or dual supplies from ±1V to ±5V. Key electrical specifications include a unity gain bandwidth of 0.7MHz at ±2.5V, a slew rate of 0.7V/µs, and a maximum supply current of 500µA at 5V. It offers high open-loop voltage gain (up to 100V/mV) and extremely low input bias current (typically 1pA). The component is housed in an 8-pin Small Outline Plastic Dip (SOIC) package and is rated for an operating temperature range of 0°C to +70°C.

Feature Summary

• Rail-to-rail input and output voltage capability for full signal swing near supply rails
• Extremely low input bias current suitable for high source impedance applications
• Internally compensated for unity gain stability without external nulling components
• Output short circuit protection and robust design for rugged environments

Applications

• Photodiode amplifiers and picoammeters
• Charge integrators and sample/hold amplifiers
• High performance portable instruments
• Active filters and sensor/transducer amplifiers
• Current to voltage converters

Procurement Notes

Verify that the ordering suffix SAL corresponds to the 8-pin SOIC plastic package variant. Confirm the specific grade (A, B, or standard) matches the required offset voltage and drift specifications. Ensure the application environment remains within the 0°C to +70°C operating temperature range defined for this package type. Check for lead-free (RoHS) compliance if required by assembly standards.

Selection Notes

Select this component when low power consumption and rail-to-rail signal handling are critical. It is suitable for battery-operated systems requiring minimal quiescent current. Consider the 0.7MHz bandwidth and 0.7V/µs slew rate for moderate-speed signal processing. Verify that the high input impedance aligns with the source characteristics to minimize loading effects.

Part Context

The ALD2701 series includes variants such as ALD2701APAL (PDIP) and ALD2701ADA (CERDIP). The ALD2701ASAL specifically denotes the surface-mount SOIC version. All variants share the same internal ACMOS silicon gate process and pinout compatibility with µA741 and ICL7621 types, facilitating drop-in replacements in existing designs.

Replacement Considerations

Public confirmed substitute part numbers are not provided in the datasheet. Designers should verify pinout compatibility with µA741 and ICL7621 equivalents if cross-referencing other manufacturers' parts.

FAQ

Does the ALD2701ASAL require external compensation?

No, the device is internally compensated for unity gain stability using a novel scheme that does not use a nulling resistor.

What is the typical input bias current?

The typical input bias current is 1.0pA at room temperature, which is essentially determined by input protection diode reverse bias leakage currents.

How does the rail-to-rail input stage behave near the positive supply?

Complementary p-channel and n-channel input stages switch off internally about 1.5V below the positive supply voltage to maintain compatibility with other op-amps.