REF191GSZ

Overview

The REF191GSZ is a precision micropower voltage reference from the Analog Devices REF19x series, housed in an 8-lead SOIC package. It provides a nominal output voltage of 2.048 V with an initial accuracy of ±2 mV maximum and a temperature coefficient of 5 ppm/°C maximum. The device operates with a supply current of 45 μA maximum and features low dropout voltage characteristics, allowing operation with supplies as low as 100 mV above the output voltage. It includes short-circuit protection and a sleep mode that reduces supply current to 15 μa maximum.

Feature Summary

• Utilizes patented temperature drift curvature correction circuit and laser trimming for high stability
• Features low dropout voltage design enabling operation with minimal supply headroom
• Includes a dedicated sleep pin for reducing power consumption in standby states
• Provides short-circuit protection for enhanced reliability

Applications

• Portable instruments
• ADCs and DACs
• Smart sensors
• Solar powered applications
• Loop-current-powered instruments

Procurement Notes

Verify the specific electrical grade (E, F, or G) required for your application, as performance specifications such as temperature coefficient and line regulation vary by grade. Confirm the package suffix matches the desired form factor, as the GSZ designation indicates an 8-lead SOIC. Ensure compatibility with the required operating temperature range, noting that extended industrial ranges may have different specifications than standard commercial grades.

Selection Notes

Select the REF191GSZ when a stable 2.048 V reference is needed with low power consumption. Consider the E grade for tighter temperature coefficients and better line/load regulation if higher precision is required. Evaluate the need for the sleep function to manage power budgets in battery-operated devices. Ensure the input supply voltage accommodates the specified dropout voltage under maximum load conditions.

Part Context

The REF191GSZ belongs to the REF19x series of precision band gap voltage references. This series offers various fixed output voltages ranging from 2.048 V to 5.00 V. The components are designed for micropower applications, featuring low supply currents and low dropout capabilities. They are available in multiple packages including SOIC, TSSOP, and PDIP, catering to diverse PCB layout requirements.

Replacement Considerations

Direct replacements within the same family include other REF19x variants with different output voltages if the voltage level can be adjusted. Cross-referencing should focus on matching the output voltage, package type, and electrical grade specifications. Verify that any substitute component meets the same thermal and regulatory requirements.