L4949DR2

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

The L4949DR2 is a monolithic integrated low dropout (LDO) voltage regulator manufactured by onsemi. It provides a fixed 5V output with a maximum current capability of 100mA. The device features an integrated power-on reset circuit and input voltage sense comparator. It operates within a DC supply voltage range of 6V to 28V, with transient voltages up to 40V. The typical dropout voltage is 0.3V, with a maximum of 0.5V at full load. The component is housed in an 8-pin DIP package.

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

• Integrates a power-on reset generator that monitors the output voltage level
• Includes a voltage sense comparator for monitoring input supply conditions
• Provides thermal shutdown and short-circuit protection for internal safety
• Features extremely low quiescent current consumption in standby mode

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

• Microcomputer controlled systems in automotive environments
• Power supply modules requiring stable 5V logic levels
• Systems necessitating input voltage supervision and reset signaling

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

Verify the specific suffix DR2 against official onsemi documentation to confirm tape-and-reel packaging and lead-free compliance. Ensure the order matches the exact L4949 variant required for your design, as suffixes may indicate packaging or environmental certifications rather than functional changes. Cross-reference the datasheet revision date to ensure compatibility with current manufacturing standards.

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

Select this component when a fixed 5V output with integrated system management functions is required. It is suitable for designs needing input voltage sensing alongside regulation. Consider the 100mA current limit and 28V maximum input voltage during circuit planning. Verify that the DIP-8 package fits the available board space and assembly constraints.

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

The L4949 series belongs to onsemi's portfolio of multifunction very low dropout voltage regulators designed for automotive and industrial applications. These devices combine linear regulation with diagnostic features like reset generation and voltage sensing. The family targets microprocessor-based systems requiring reliable power sequencing and input supervision under varying supply conditions.

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

The NCV4949A is a documented automotive-grade alternative within the same product family. Verify pinout compatibility and electrical parameter alignment before substitution. Check if the replacement part meets specific AEC-Q100 qualification requirements for your application.