ISL28291FBZ-T7

Instrumentation, Op Amps, Buffer Amps Overview

The ISL28291FBZ-T7 is a dual-channel, ultra-low noise, low distortion operational amplifier manufactured by Renesas Electronics Corporation. It features rail-to-rail output capability and input common-mode voltage that extends to the negative supply rail (ground detection). The device operates on a single supply voltage ranging from 3V to 5.5V. Key electrical characteristics include an input voltage noise of 1.7nV/√Hz at 1kHz, a typical Total Harmonic Distortion plus Noise (THD+N) of 0.00018% at 1kHz with a 2V p-p output, and a gain bandwidth product of 61MHz. The maximum offset voltage is specified at 630μV, with an input bias current of 3μA. It offers a typical Common Mode Rejection Ratio (CMRR) of 100dB and Power Supply Rejection Ratio (PSRR) of 80dB. The unit is housed in a 10-lead MSOP package and supports operation across a temperature range of -40°C to +125°C.

Instrumentation, Op Amps, Buffer Amps Feature Summary

• Ultra-low noise performance with 1.7nV/√Hz input voltage noise density
• Extremely low distortion characterized by 0.00018% THD+N at 1kHz
• Rail-to-rail output swing with input common-mode voltage extending to ground
• Stable for unity-gain applications with high CMRR and PSRR

Instrumentation, Op Amps, Buffer Amps Applications

• High precision LVDT displacement measurement systems
• Industrial automation signal conditioning
• Medical instrumentation requiring low noise amplification
• Audio processing circuits demanding low distortion

Instrumentation, Op Amps, Buffer Amps Procurement Notes

Verify the specific suffix 'FBZ' against official Renesas documentation to confirm the exact package type and tape-and-reel configuration. Ensure compatibility with your PCB footprint for the 10-lead MSOP variant. Confirm operating temperature ranges match your environmental requirements. Check for any recent lifecycle notices or obsolescence warnings directly from the manufacturer before finalizing procurement plans.

Instrumentation, Op Amps, Buffer Amps Selection Notes

Select this component when designing circuits that require minimal signal degradation in low-level analog front ends. The combination of ultra-low noise and low distortion makes it suitable for sensitive sensor interfaces. Consider the rail-to-rail output feature if driving loads close to the supply rails. Verify that the 61MHz bandwidth meets the frequency response needs of your application without introducing unnecessary power consumption associated with higher-speed amplifiers.

Instrumentation, Op Amps, Buffer Amps Part Context

This part belongs to the ISL28191/ISL28291 family of ultra-low noise operational amplifiers. While the ISL28191 is a single-channel version, the ISL28291 provides two channels in a compact package. These devices are designed to replace older, bulkier low-noise amplifiers in modern space-constrained designs. They share similar electrical specifications but differ in channel count and pinout configurations depending on the specific package selected.

Instrumentation, Op Amps, Buffer Amps Replacement Considerations

Direct functional substitutes within the same family include the ISL28191 for single-channel applications. Other dual-channel low-noise amplifiers may serve as alternatives if pinouts and electrical parameters align. Always verify pin compatibility and thermal performance when substituting components from different manufacturers.