RS721PXF

Overview

The RS721PXF is a single-channel, precision, rail-to-rail I/O CMOS operational amplifier manufactured by Runic Technology. It operates within a supply voltage range of +2.5V to +5.5V and supports dual supplies from ±1.25V to ±2.75V. The device features a gain-bandwidth product of 10MHz and a slew rate of 6V/µs. Input offset voltage is specified at a maximum of 0.8mV with a typical drift of 2.6µV/°C across the operating temperature range of -40°C to +125°C. Quiescent current per amplifier is typically 1.1mA. The component is housed in an SOT23-5 package.

Feature Summary

• Rail-to-rail input and output capability for extended dynamic range
• Internal phase-reversal protection against excessive common-mode voltages
• High electromagnetic interference (EMI) rejection ratio performance
• Unity-gain stability with ultra-low input bias current

Applications

• Sensor interfaces
• Active filters
• Test equipment
• Driving A/D converters
• Photodiode amplification

Procurement Notes

Verify that the ordering suffix 'XF' corresponds specifically to the SOT23-5 package configuration as documented in the manufacturer's orderable addendum. Confirm that the device marking matches the datasheet specification for this specific variant. Ensure compliance with the absolute maximum ratings regarding signal input and output pin voltages to prevent permanent damage during operation.

Selection Notes

Select this component when low-voltage operation between 2.5V and 5.5V is required alongside high-speed performance. The 10MHz bandwidth and 6V/µs slew rate support applications needing fast signal processing. The rail-to-rail I/O feature maximizes signal swing in portable or battery-powered systems. Verify thermal resistance requirements for the SOT23-5 package if operating near the upper temperature limits.

Part Context

This part belongs to the RS72XP family of operational amplifiers, which includes dual (RS722P) and quad (RS724P) channel variants. All members share identical electrical characteristics, including the 10MHz gain-bandwidth product and rail-to-rail specifications. The family is designed for precision applications requiring low noise and distortion across a wide supply voltage range.

Replacement Considerations

Direct substitutes within the same family include RS722PXF (dual channel) and RS724PXF (quad channel), provided additional channels are acceptable. Other packages such as SOIC-8 (RS721PXK) or MSOP-8 (RS721PXM) offer equivalent electrical performance but require footprint adaptation.

FAQ

Does the RS721P exhibit phase reversal when the input exceeds the common-mode range?

No, the device includes internal phase-reversal protection. When driven beyond the linear common-mode range, the output is limited to the appropriate rail instead of reversing.

What is the maximum supply voltage allowed for this component?

The absolute maximum supply voltage is 7V. Operating above this limit may cause permanent damage to the amplifier.