REF191ES-REEL

Overview

The REF191ES-REEL 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. The device features a low dropout voltage design and consumes a maximum supply current of 45 μA. It includes a sleep mode that reduces current consumption to 15 μa maximum. The unit offers high output current capability up to 30 mA and incorporates short-circuit protection.

Feature Summary

• Utilizes patented temperature drift curvature correction circuitry for high stability
• Features laser trimming of thin-film resistors to achieve precise initial accuracy
• Includes a dedicated sleep pin for reducing power consumption via TTL or CMOS logic levels
• Provides integrated short-circuit protection for enhanced reliability

Applications

• Portable instrumentation systems
• Analog-to-digital and digital-to-analog converters
• Smart sensor interfaces
• 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 vary between grades. Confirm the REEL suffix indicates tape and reel packaging suitable for automated assembly processes. Ensure the input voltage range aligns with the specified line regulation conditions for the selected grade.

Selection Notes

Select this component when low quiescent current and high precision are critical. The REF191 variant is appropriate for circuits requiring a 2.048 V reference. Consider the extended industrial temperature range capabilities if operating in automotive environments. Evaluate the dropout voltage requirements against the available supply headroom.

Part Context

This part belongs to the REF19x series of precision band gap voltage references manufactured by Analog Devices. The series encompasses multiple output voltage options including 2.5 V, 3.0 V, and 5.0 V variants. All devices share common architectural features such as micropower operation and low dropout characteristics within the same package family.

FAQ

What is the function of Test Pins 1 and 5?

Test Pins 1 and 5 are factory test points reserved for in-package Zener zap trimming. They should remain unconnected during normal operation.

How does the device enter sleep mode?

Sleep mode is enabled by applying a low TTL or CMOS level to the SLEEP pin, which turns off the output and reduces supply current.