ISL28278FAZ

Instrumentation, Op Amps, Buffer Amps Overview

The ISL28278FAZ is a dual-channel micropower operational amplifier manufactured by Renesas Electronics Corporation. It operates on a single supply voltage ranging from 2.4V to 5.5V and features rail-to-rail input and output capabilities. The device includes an Input Range Enhancement Circuit (IREC) allowing inputs to swing 10% above V+ and 100mV below V-. Key electrical specifications include a maximum offset voltage of 225µV, a typical gain-bandwidth product of 250kHz, and a quiescent supply current of 120µA per channel when enabled. An enable pin reduces disabled current to approximately 4µA.

Instrumentation, Op Amps, Buffer Amps Feature Summary

• Input Range Enhancement Circuit (IREC) extends common-mode voltage range beyond supply rails for ground sensing.
• Rail-to-rail input and output stages maintain precision without distortion at signal extremes.
• Dedicated enable pins allow individual channel power-down to minimize system consumption.
• Low quiescent current design optimized for battery-powered and solar energy applications.

Instrumentation, Op Amps, Buffer Amps Applications

• Battery- or Solar-powered Systems
• Medical Devices
• Thermocouple Amplifiers
• Photodiode Pre-amps

Instrumentation, Op Amps, Buffer Amps Procurement Notes

Verify the specific package marking '28278 FAZ' against the datasheet ordering information to confirm authenticity. Ensure the component meets RoHS compliance requirements as specified in the manufacturer's documentation. Confirm that the operating temperature range aligns with your application's environmental constraints before finalizing procurement.

Instrumentation, Op Amps, Buffer Amps Selection Notes

Select this component for designs requiring low power consumption alongside high DC accuracy. The inclusion of an enable pin makes it suitable for multiplexed sensor arrays where standby power must be minimized. Verify that the 250kHz bandwidth meets the AC performance requirements of the target signal processing circuit.

Instrumentation, Op Amps, Buffer Amps Part Context

This part belongs to the ISL2827x/ISL2847x family of micropower op amps. While the ISL28278 provides two channels, the ISL28478 variant offers four channels within the same 16-lead QSOP package. Both share identical electrical characteristics and pinouts, differing only in channel count.

Instrumentation, Op Amps, Buffer Amps Replacement Considerations

Consult Intersil Technical Support Center for possible substitute products as the datasheet notes this part is not recommended for new designs.

Instrumentation, Op Amps, Buffer Amps FAQ

How does the Input Range Enhancement Circuit function?

The IREC allows the input voltage to exceed the positive supply rail by 10% and go 100mV below the negative supply while maintaining CMRR performance.

What is the effect of the enable pin on power consumption?

Pulling the EN pin high disables the amplifier, reducing the quiescent supply current typically to 4µA in the disabled state.