ISL21009BFB841Z

Overview

The ISL21009BFB841Z is a high-precision voltage reference utilizing Intersil's proprietary Floating Gate Analog (FGA) technology. It provides a fixed output of 4.096V with an initial accuracy of ±0.5mV and a temperature coefficient of 3ppm/°C. The device operates within an input voltage range of 4.5V to 16.5V, drawing a maximum supply current of 180µA. It features low noise performance of 4.5µVp-p in the 0.1Hz to 10Hz bandwidth and supports up to ±5.0mA output current. Packaged in an 8-lead SOIC, it functions across a temperature range of -40°C to +125°C.

Feature Summary

• Utilizes proprietary Floating Gate Analog technology for extremely low temperature drift and high initial accuracy without relying on traditional bandgap references.
• Offers micropower operation with typical supply current of 95µA, making it suitable for battery-powered portable applications.
• Includes a dedicated TRIM pin allowing user-adjustable output voltage variation of approximately ±2.5%.
• Provides robust line regulation and ripple rejection capabilities across a wide input voltage range.

Applications

• High resolution A/Ds and D/As
• Digital Meters
• Battery Management/Monitoring
• Industrial/Instrumentation Equipment

Procurement Notes

Verify component authenticity through authorized channels as this part may be subject to obsolescence or discontinuation notices. Confirm that the specific ordering suffix matches the required electrical grade and package type. Ensure handling procedures account for electrostatic discharge sensitivity. Review datasheet notes regarding post-reflow voltage shifts and X-ray shielding requirements for final assembly validation.

Selection Notes

Select this component when designing systems requiring high precision with minimal power consumption. The 4.096V output is ideal for driving 12-bit sub-ranging DACs or instrumentation amplifiers. Consider the 3ppm/°C temperature coefficient for environments with significant thermal variations. Evaluate the need for external trimming if tighter tolerance than ±0.5mV is required.

Part Context

This device belongs to the ISL21009 FGA™ family of voltage references manufactured by Renesas Electronics Corporation (formerly Intersil). The family includes variants with different output voltages (1.25V, 2.5V, 5.0V) and accuracy grades. The 'B' designation indicates the highest accuracy grade (±0.5mV) and lowest temperature coefficient (3ppm/°C) within the series.

Replacement Considerations

ISL21009CFB841Z

FAQ

How does the Floating Gate Analog technology impact long-term stability?

The floating gate stores charge precisely during manufacturing, resulting in excellent long-term stability and very low temperature drift compared to standard bandgap references.

What are the board mounting considerations for this device?

To maintain accuracy, mount the device near the edge of the PCB or in a cutout to minimize die stress from board flexing during thermal cycling.