LT1121CN8#PBF

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Overview

The LT1121CN8#PBF is a micropower low dropout regulator with shutdown, manufactured by Analog Devices Inc. It operates within a temperature range of 0°C to 125°C and is housed in an 8-lead plastic PDIP package. The device provides up to 150mA of output current with a typical dropout voltage of 0.4V at full load. Quiescent current is 30µA during operation and drops to 16µA in shutdown mode. The adjustable version supports output voltages from 3.75V to 30V, while fixed versions are available at 3.3V and 5V.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Feature Summary

• Micropower operation with controlled quiescent current that does not rise significantly in dropout conditions
• Integrated shutdown pin for power management, reducing standby current consumption
• Inherent reverse battery protection allowing input connection to ground or reverse voltage without damage
• Stable with small output capacitors, enabling the use of compact ceramic components

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Applications

• Battery-powered systems requiring extended operational life
• Backup power circuits where input may be grounded or reversed
• Post-regulation for switching power supplies
• Low current regulator applications in portable electronics

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Procurement Notes

Verify the component matches the specific 8-lead PDIP package configuration and lead-free finish indicated by the #PBF suffix. Confirm the temperature grade corresponds to the 'C' designation for commercial range (0°C to 125°C). Ensure the ordering part number aligns with the required output voltage variant if selecting from the broader LT1121 family.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Selection Notes

Select this component when designing for battery-operated environments where minimizing quiescent current is critical. The adjustable output range allows flexibility for custom voltage requirements between 3.75V and 30V. Consider the thermal resistance characteristics of the PDIP package for heat dissipation in high-load scenarios. Verify that the external capacitor selection meets stability requirements for the chosen load conditions.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Part Context

This part belongs to the LT1121 series of micropower low dropout regulators. The series includes adjustable, 3.3V fixed, and 5V fixed variants. Other package options include SOIC, SOT-223, and TO-92. The CN8 suffix specifically denotes the commercial temperature grade and the 8-lead PDIP physical form factor.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Replacement Considerations

Direct substitutes within the same family include LT1121IN8#PBF for industrial temperature range or LT1121CS8#PBF for surface mount SOIC packaging. Fixed voltage equivalents are LT1121CN8-3.3#PBF and LT1121CN8-5#PBF.