L4931ABZ120

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

The L4931ABZ120 is a positive fixed linear voltage regulator from the L4931 family, manufactured by STMicroelectronics. It provides a stable 12V output with a maximum current capacity of 250 mA. The device features a very low dropout voltage of 0.4 V and operates within an input voltage range up to 20 V. It utilizes a TO-92-3 through-hole package. Key electrical characteristics include a typical quiescent current of 600 µA in ON mode and 50 µA in OFF mode. The unit offers high supply voltage rejection of 70 dB (typical for the 5V version, similar performance expected) and includes internal current limiting and thermal shutdown protection. It requires only a 2.2 µF output capacitor for stability.

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

• Very low dropout voltage capability suitable for battery-powered systems
• Logic-controlled electronic shutdown function for power management
• Internal current limit and thermal overload protection
• Requires minimal external capacitance for stability

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

• Battery-powered portable devices
• Low noise power supply circuits
• Local regulation in microprocessor systems
• Standby mode control applications

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

Verify the specific suffix 'AB' indicates ±1% output voltage accuracy at 25°C compared to the 'C' variant's ±2%. Confirm the 'Z' suffix denotes the lead-free and RoHS compliant status as per STMicroelectronics standards. Ensure the TO-92-3 package matches your PCB footprint requirements. Check for end-of-life status or obsolescence notices from the manufacturer before finalizing procurement plans.

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

Select this component when a fixed 12V output is required with high precision (±1%). The TO-92 package is ideal for through-hole assembly where space allows. Consider the L4931CD120 if surface mount packaging is preferred. Evaluate the quiescent current consumption against system power budgets, noting the higher current draw in ON mode versus standby. Ensure input voltage does not exceed the 20 V maximum rating.

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

The L4931 series comprises very low drop voltage regulators designed for low power and low noise applications. The AB suffix specifically denotes a tighter output voltage tolerance of ±1% at 25°C, whereas the C suffix offers ±2%. This part belongs to a family that supports various output voltages including 3.3V, 3.5V, 5V, and 12V, sharing common features like inhibit logic and thermal protection.

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

Direct substitutes may include other L4931 variants with different accuracies or packages, such as L4931CD120 (SOIC-8, ±2% accuracy). Verify pin compatibility and thermal performance when substituting between TO-92 and SOIC packages.