L4931CPT33-TR

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

The L4931CPT33-TR is a positive fixed linear voltage regulator (LDO) manufactured by STMicroelectronics. It provides a stable 3.3V output with a maximum current capacity of 250mA. The device features a maximum input voltage of 20V and a typical dropout voltage of 0.8V at full load. Quiescent current is specified at 1mA, with a supply current maximum of 6mA. Power supply rejection ratio (PSRR) ranges from 73dB to 55dB across frequencies of 120Hz to 10kHz. It includes overcurrent and thermal overload protection functions. The component operates within a temperature range of -40°C to +125°C and is housed in a DPAK package.

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

• Provides stable fixed positive output voltage regulation
• Supports up to 250mA continuous load current
• Includes internal overcurrent and thermal shutdown protection
• Operates with low quiescent current for power efficiency

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

• Battery-powered systems requiring low standby current
• Local voltage regulation in portable electronic devices
• Low noise power supply circuits
• General purpose linear regulation for digital logic supplies

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

Verify the specific suffix 'C' indicates the 2% output voltage accuracy grade compared to the 'AB' variant which offers 1% accuracy. Confirm the 'PT' designation corresponds to the PPAK/DPAK package style required for your PCB footprint. Ensure the '-TR' suffix matches the reel packaging format needed for your assembly line equipment. Cross-reference the manufacturer part number against official STMicroelectronics documentation to confirm current production status and RoHS compliance details.

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

Select this component when a fixed 3.3V rail is required with moderate current demands up to 250mA. The low dropout characteristic makes it suitable for applications where the input voltage is close to the output voltage. Consider the thermal performance in the DPAK package if operating near maximum current limits. Verify that the input voltage does not exceed the 20V absolute maximum rating under all transient conditions.

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

This part belongs to the L4931 family of very low drop voltage regulators from STMicroelectronics. The family is designed for low noise and low power applications, particularly in battery-operated systems. Variants are available in different packages including SO-8, DPAK, and TO-92, with various fixed output voltages such as 3.3V, 3.5V, and 5V. The L4931 series emphasizes space saving by requiring only small output capacitors for stability.

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

The L4931CDT33-TR is a documented substitute part number from the same manufacturer, offering identical electrical specifications but potentially in a different package configuration or accuracy grade. Verify pinout compatibility and thermal characteristics before substitution.