LM2574-3.3YN

Voltage Regulators - DC DC Switching Regulators Overview

The LM2574-3.3YN is a step-down switching voltage regulator manufactured by Microchip Technology, designed for fixed output applications. It provides a stable 3.3V output with a maximum current capacity of 500mA. The device operates from an input voltage range up to 40V and utilizes a buck topology for efficient power conversion. It features a standard switching frequency of 52kHz and supports through-hole mounting in an 8-DIP package. The component is rated for operation across a junction temperature range of -40°C to 125°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Fixed 3.3V output regulation for simplified circuit design
• Integrated high-current switch capable of delivering 500mA load current
• Wide input voltage tolerance supporting up to 40V sources
• Robust thermal performance suitable for industrial operating temperatures

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation in embedded systems
• Power supply stages for microcontroller units
• Battery-powered equipment requiring efficient voltage stepping
• Industrial control modules needing isolated or regulated DC rails

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'YN' against official Microchip documentation to confirm pinout compatibility and package dimensions. Confirm RoHS status as datasheets may indicate non-compliance for certain variants. Ensure the supplier provides valid traceability documents. Cross-reference the manufacturer part number with authorized distributor listings to avoid counterfeit components. Check for obsolescence notices before finalizing procurement plans.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 3.3V rail is required from higher input voltages. It is suitable for designs prioritizing simplicity over adjustable outputs. Consider the 500mA limit for load requirements. Evaluate the 8-DIP package for prototyping or low-volume production needs. Compare efficiency at the target switching frequency against alternative regulators if thermal management is critical.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2574 family of simple switcher regulators. It shares architectural similarities with other members like the LM2574-5.0 but differs in internal feedback network settings for fixed output voltages. The family is known for minimal external component count. It serves as a legacy option compared to newer synchronous buck converters, offering reliability in established industrial designs.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

The LM2574-3.3BN is listed as a direct substitute. Verify pin compatibility between the BN and YN suffixes. Ensure the replacement maintains the same 8-DIP package and electrical specifications. Confirm availability and lead times for the substitute part.