R1121N321B-TR-FE

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

The R1121N321B-TR-FE is a CMOS-based low dropout voltage regulator with a fixed 3.2V output and 150mA maximum current capability. It operates within an input voltage range of 2.0V to 8.0V, featuring a typical supply current of 35μA and standby current of 0.1μA. The device includes a chip enable circuit active at high logic levels, ensuring low power consumption when disabled. It provides high ripple rejection of 70dB at 1kHz and maintains output voltage accuracy within ±2.0%. Packaged in SOT-23-5, it supports operation from -40°C to +85°C.

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

• Built-in chip enable circuit for active-high control
• Low noise performance with minimal output ripple
• High density mounting via compact SOT-23-5 package

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

• Power source for cellular phones such as GSM, CDMA and various kinds of PCSs
• Power source for domestic appliances such as cameras, VCRs and camcorders
• Power source for battery-powered equipment

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

Verify the specific output voltage designation (321 indicating 3.2V) and the active-high chip enable suffix (B) against system requirements. Confirm that the SOT-23-5 package dimensions align with the PCB footprint. Ensure the selected external capacitors meet the equivalent series resistance specifications required for stable phase compensation during operation.

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

Select this component when a fixed 3.2V rail is required with minimal quiescent current draw. The active-high chip enable feature allows direct interface with standard logic outputs for power management. Verify that the input voltage remains above the minimum threshold while accounting for the dropout voltage under maximum load conditions to ensure regulation stability.

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

This part belongs to the R1121N Series of low noise 150mA LDO regulators manufactured by Nisshinbo Micro Devices. The series is designed for handheld communication equipment and battery-powered devices requiring high output voltage accuracy and extremely low supply current. The xx1B designation indicates a fixed output voltage with an active-high chip enable function.

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

Compatible substitutes include other parts from the R1121N series with matching output voltages and pin configurations, such as R1121N321A-TR-FE which shares identical electrical characteristics but utilizes an active-low chip enable circuit.