LT1461CIS8-3.3#PBF

Voltage Reference Overview

The LT1461CIS8-3.3#PBF is a micropower precision low dropout series voltage reference manufactured by Analog Devices Inc. It provides a fixed 3.3V output with an initial accuracy of ±0.08% and a maximum temperature coefficient of 12ppm/°C over the industrial temperature range of –40°C to 85°C. The device operates with a supply current of 35µA typical and supports up to 50mA output drive current. It features a shutdown pin for power management, thermal limiting protection, and is housed in an 8-lead plastic SO package.

Voltage Reference Feature Summary

• Combines high accuracy and low drift with low supply current and high output drive capability
• Utilizes advanced curvature compensation techniques and trimmed precision thin-film resistors
• Includes a shutdown feature to switch full load currents and enable system power down
• Incorporates thermal shutdown protection against overload conditions

Voltage Reference Applications

• A/D and D/A Converters
• Precision Regulators
• Handheld Instruments
• Power Supplies

Voltage Reference Procurement Notes

Verify the specific suffix #PBF indicates lead-free finish and tube packaging when ordering. Confirm the IS8 designation corresponds to the industrial temperature grade (-40°C to 85°C) rather than commercial or high-grade variants. Ensure compatibility with 8-lead SOIC footprints during PCB layout. Cross-reference the exact part number with official Analog Devices documentation to confirm availability and manufacturing status.

Voltage Reference Selection Notes

Select this component when a fixed 3.3V reference with ±0.08% initial accuracy is required. The 12ppm/°C temperature coefficient suits industrial environments ranging from –40°C to 85°C. Consider the 35µA supply current for battery-operated designs and the 50mA drive capability for regulator applications. Verify that the input voltage remains within the specified dropout limits relative to the 3.3V output.

Voltage Reference Part Context

This part belongs to the LT1461 family of micropower precision low dropout series voltage references. The 'CI' suffix denotes the industrial temperature grade with 0.08% accuracy and 12ppm/°C drift. The 'S8' indicates the 8-lead SOIC package. The '#PBF' suffix specifies lead-free termination and tube packaging. Other grades include AC (commercial, 0.04%), BC (commercial, 0.06%), and DH (high temp, 0.15%).

Voltage Reference Replacement Considerations

LT1461CIS8-3.3#TRPBF serves as the tape and reel equivalent for automated assembly. LT1461BCS8-3.3#PBF offers higher accuracy (0.06%) but at the commercial temperature range (0°C to 70°C). LT1461AIS8-3.3#PBF provides the same industrial temperature range but with superior 0.04% accuracy and 3ppm/°C drift.