AT8541

Overview

The AT8541 is a zero-drift, low-power CMOS operational amplifier featuring rail-to-rail input and output capabilities. It operates within a supply voltage range of 2V to 5.5V and consumes only 40μA per amplifier. The device utilizes auto-calibration techniques to deliver an exceptionally low typical input offset voltage of ±7μV with minimal drift of ±0.08μV/°C. Key electrical parameters include a gain-bandwidth product of 350kHz, a slew rate of 0.16V/μs, and a peak-to-peak noise of 0.9μV in the 0.1Hz to 10Hz band. It is specified for extended industrial and automotive temperature ranges from −40°C to +125°C.

Feature Summary

• Employs auto-calibration techniques to achieve ultra-low offset voltage and near-zero drift across varying time and temperature conditions.
• Features rail-to-rail input and output swing, supporting operation on single or dual supplies as low as 2V.
• Provides high precision with low quiescent current consumption and excellent common-mode rejection ratio.

Applications

• Battery-powered instruments
• Medical instruments
• Handheld test equipment
• Temperature measurements
• Transducers

Procurement Notes

Verify the specific package variant required, as the AT8541 is available in both SOT23-5 and SOT353 (SC70-5) configurations. Confirm that the application environment remains within the specified operating temperature range of −40°C to +125°C. Ensure proper decoupling capacitors are placed close to the power supply pins to maintain stability. Review absolute maximum ratings to prevent damage from supply voltages exceeding 7V or input signals swinging beyond the rails without current limiting.

Selection Notes

Select the AT8541 when designing circuits requiring high precision with minimal thermal drift and low power consumption. Its rail-to-rail I/O makes it suitable for single-supply systems where signal integrity near the supply rails is critical. Consider this component for battery-operated devices due to its low quiescent current. Verify that the 350kHz bandwidth and 0.16V/μs slew rate meet the dynamic requirements of the target application.

Part Context

The AT8541 is manufactured by Analog Technologies, Inc., a provider of analog semiconductor solutions. It belongs to a family of zero-drift operational amplifiers designed for high-precision applications. The device integrates auto-zeroing technology to correct for offset errors, distinguishing it from standard CMOS op-amps. It is intended for use in environments demanding long-term stability and accuracy under varying thermal conditions.

Replacement Considerations

No public confirmed substitute part numbers are documented in the provided datasheet.

FAQ

What packaging options are available for the AT8541?

The AT8541 is available in two micro-size packages: SOT23-5 and SOT353 (SC70-5).

How does the AT8541 handle input signals that exceed the supply rails?

Input terminals are diode-clamped to the power supply rails. Signals swinging more than 0.3V beyond the rails must be current-limited to 10mA or less to prevent damage.

Is the AT8541 unity-gain stable?

Yes, the AT8541 is unity-gain stable and free from unexpected output phase reversal.