RC1587M33

Overview

The RC1587M33 is a fixed-output low dropout linear voltage regulator manufactured by onsemi, designed for high-current applications. It provides a stable 3.3 V output with a maximum continuous current capability of 3 A. The device operates within an input voltage range up to 7 V and features a typical dropout voltage of 1.15 V at full load. It utilizes a D2PAK-3 (TO-263-3) surface-mount package suitable for thermal management. Key electrical specifications include a line regulation of 0.2%, load regulation of 0.5%, and a maximum power dissipation rating of 18 W. The component supports an operating temperature range from 0°C to +125°C.

Feature Summary

• Provides fixed 3.3 V regulated output for sensitive digital logic circuits
• Capable of delivering 3 A continuous load current with low dropout performance
• Designed for Intel Pentium II GTL+ and Pro processor voltage regulation
• Surface-mount TO-263-3 package facilitates efficient heat dissipation

Applications

• Intel Pentium II GTL+ processor core voltage regulation
• Intel Pentium Pro processor power supply systems
• General-purpose 3.3 V power distribution networks
• Embedded systems requiring stable low-noise power rails

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels due to discontinued status. Confirm RoHS compliance documentation as indicated in official datasheets. Validate package marking and pinout alignment against the D2PAK-3 specification before integration. Ensure thermal design accounts for the 18 W dissipation limit under worst-case operating conditions.

Selection Notes

Select this component when a fixed 3.3 V output at 3 A is required for legacy Intel processor architectures. Consider the TO-263-3 package for applications needing robust thermal performance without external heatsinks. Evaluate input voltage headroom to ensure dropout remains within specified limits during peak load transients. Compare thermal resistance characteristics against alternative packages if space constraints differ.

Part Context

The RC1587 series belongs to onsemi's lineup of low dropout linear regulators tailored for high-current digital loads. This specific model targets the voltage regulation needs of early 1990s to 2000s era processors like the Pentium II. It complements other PMIC offerings by providing simple, reliable linear regulation where switching noise must be minimized. The family shares architectural similarities with the RC1587T33, differing primarily in packaging technology.

Replacement Considerations

LT1587CT-3.3#PBF is documented as a direct substitute part number.