REF194ES-REEL

Overview

The REF194ES-REEL is a discontinued precision voltage reference IC from Analog Devices Inc., part of the REF19 series. It provides a fixed output voltage of 4.5V with an initial accuracy tolerance of ±0.04%. The device operates within an input voltage range of 4.75V to 15V and delivers a maximum output current of 30mA while consuming only 45µA of supply current. It features a low temperature coefficient of 5ppm/°C and exhibits 0.1Hz to 10Hz noise of 45µVp-p. Packaged in an 8-SOIC format, it functions reliably across a temperature range of -40°C to +85°C.

Feature Summary

• Utilizes patented temperature drift curvature correction circuitry for high stability
• Incorporates laser-trimmed thin-film resistors to achieve low temperature coefficients
• Features micropower architecture with low supply current consumption
• Includes internal short-circuit protection mechanisms

Applications

• Portable instrumentation systems
• Analog-to-digital converter (ADC) references
• Digital-to-analog converter (DAC) references
• Smart sensor interfaces
• Loop-powered instrument circuits

Procurement Notes

Verify component status as this specific part number is officially obsolete and no longer manufactured. Confirm availability of direct replacement variants such as the REF194ESZ or REEL suffix equivalents before finalizing procurement plans. Ensure compatibility with existing design specifications when transitioning to updated package or revision codes.

Selection Notes

Select this component for applications requiring high precision and low power consumption in portable devices. Consider the fixed 4.5V output and ±0.04% accuracy for sensitive measurement circuits. Evaluate the 8-SOIC package constraints and thermal performance requirements against the specified operating temperature range of -40°C to +85°C.

Part Context

This component belongs to the REF19x Series of precision voltage references designed by Analog Devices Inc. The series is characterized by micropower operation and high accuracy, utilizing bandgap technology with curvature correction. These devices are engineered for applications demanding stable reference voltages under varying temperature conditions and low power budgets.

Replacement Considerations

Direct substitute part numbers include REF194ESZ and REF194ESZ-REEL. Verify pinout compatibility and electrical parameter equivalence when substituting the obsolete REF194ES-REEL with these available alternatives.