ISL21009BFB850Z-TK

Overview

The ISL21009BFB850Z-TK is a high voltage input precision voltage reference utilizing Intersil's proprietary Floating Gate Analog (FGA) technology. It provides a fixed output voltage of 5.000V with an initial accuracy of ±0.5mV and a temperature coefficient of 3ppm/°C. The device operates within an input voltage range of 3.5V to 16.5V, drawing a maximum supply current of 180µA. It features low output noise of 4.5µV P-P from 0.1Hz to 10Hz and supports an output current capability of up to ±7.0mA. The component is housed in an 8-lead SOIC package and functions reliably across an operating temperature range of -40°C to +125°C.

Feature Summary

• Utilizes proprietary Floating Gate Analog technology for extremely low power consumption and minimal temperature drift.
• Delivers high DC precision with guaranteed initial accuracy as low as ±0.5mV and excellent line and load regulation.
• Provides ultra-low output noise performance suitable for sensitive analog signal processing applications.

Applications

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

Procurement Notes

Verify the specific suffix 'TK' indicates tape and reel packaging rather than tube, as per manufacturer ordering guidelines. Confirm that the B-grade designation corresponds to the required ±0.5mV accuracy and 3ppm/°C temperature coefficient specifications. Ensure the 8-lead SOIC package dimensions align with your PCB footprint requirements before finalizing procurement.

Selection Notes

Select this component when designing systems requiring a stable 5V reference with minimal power draw and high precision. The wide input voltage range accommodates various supply rails, while the low noise profile ensures signal integrity in data acquisition chains. Consider the thermal management capabilities of the SOIC package if operating near the upper temperature limits.

Part Context

This part belongs to the ISL21009 FGA™ voltage reference family manufactured by Renesas Electronics Corporation (formerly Intersil). The series is characterized by its use of floating gate CMOS processes to achieve superior stability and low current consumption compared to traditional bandgap references. It serves as a foundational component for precision instrumentation requiring reliable voltage standards.

Replacement Considerations

Compatible substitutes include ISL21009CFB850Z and ISL21009DFB850Z, which offer identical pinouts but differ in accuracy grades and temperature coefficients. Verify functional equivalence regarding output voltage and package type before substitution.

FAQ

How does the TRIM pin function on the ISL21009?

The TRIM pin allows for output voltage adjustment of approximately ±2.5%. It can be connected to a potentiometer between VOUT and GND to fine-tune the reference voltage.

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 caused by board flexing during thermal cycling.