REF194FS-REEL

Overview

The REF194FS-REEL is a discontinued precision series voltage reference manufactured by Analog Devices Inc. It provides a fixed nominal output 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 a noise level of 45µVp-p in the 0.1Hz to 10Hz frequency band. The component is housed in an 8-SOIC surface-mount package and supports an operating temperature range from -40°C to +85°C.

Feature Summary

• Utilizes patented temperature drift curvature correction circuitry combined with laser-trimmed thin-film resistors for high stability.
• Features a micro-power low-dropout architecture designed for efficient operation in portable and battery-powered applications.
• Includes integrated short-circuit protection to safeguard the device under fault conditions.

Applications

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

Procurement Notes

This specific part number is officially obsolete and no longer manufactured. Verification of availability requires checking for direct replacement components, such as the REF194ESZ, which serves as the confirmed substitute. Buyers must confirm that the alternative package and electrical specifications align with original design requirements before procurement.

Selection Notes

Designers should prioritize the REF194ESZ or other active members of the REF19x family due to the discontinuation of the REF194FS-REEL. Selection criteria must focus on maintaining the required 4.5V output, ±0.04% accuracy, and 8-SOIC footprint. Ensure that the chosen replacement meets the specific thermal and noise performance needs of the application without requiring significant circuit redesign.

Part Context

The REF194FS-REEL belongs to the REF19x series of precision voltage references from Analog Devices. This family is characterized by its use of bandgap technology with curvature correction to achieve low temperature coefficients. The series is widely recognized for providing stable reference voltages in high-precision data acquisition systems and industrial control applications where long-term stability is critical.

Replacement Considerations

The REF194ESZ is the confirmed direct substitute for this component. Verify that the 'Z' suffix indicates RoHS compliance and ensure the pinout remains identical to facilitate drop-in replacement in existing PCB layouts.