RC1587T33

Overview

The RC1587T33 is a discontinued low dropout three-terminal linear regulator manufactured by onsemi, formerly Fairchild Semiconductor. It provides a fixed 3.3V output with a maximum current capability of 3A. The device operates within an input voltage range of 5.1V to 7V and supports an operating temperature range from 0°C to 125°C. It is housed in a TO-220-3 through-hole package. This component was specifically optimized for low-voltage applications, including Intel Pentium II GTL+ and Pro bus termination, where transient response and minimum input voltage are critical.

Feature Summary

• Optimized for low voltage applications requiring critical transient response
• Fixed 3.3V output with 3A current capability
• Designed for VTT bus termination requirements

Applications

• Intel Pentium II GTL+ bus termination
• Intel Pentium Pro bus termination
• VTT bus termination circuits

Procurement Notes

Verify the part status as discontinued before procurement planning. Confirm functional equivalence with available direct substitutes such as the LT1587CT-3.3#PBF. Ensure that the TO-220-3 through-hole package fits the target design constraints. Review official datasheets for thermal management requirements given the 3A output capability. Validate that the 5.1V to 7V input range aligns with the system power supply specifications.

Selection Notes

Select this component only if legacy compatibility with Intel Pentium architecture is required. Consider the discontinuation status when designing new products. Evaluate alternative regulators with similar dropout characteristics and current ratings. Verify that the TO-220-3 package is suitable for the mechanical assembly. Check if adjustable versions like the RC1587T-3.3 offer better flexibility for specific voltage needs.

Part Context

The RC1587 series belongs to onsemi's portfolio of low dropout linear regulators designed for high-current, low-voltage applications. These devices were widely used in computer motherboards and processor power supplies during the late 1990s and early 2000s. The RC1587T33 specifically targets the 3.3V rail generation for processors utilizing GTL+ signaling standards. Its design emphasizes stability and fast transient response under heavy load changes typical in CPU operations.

Replacement Considerations

The LT1587CT-3.3#PBF by Analog Devices Inc. is listed as a direct substitute. Verify pinout compatibility and electrical parameter alignment before substitution. Ensure the replacement meets the same thermal and packaging requirements.

FAQ

Is the RC1587T33 still in production?

No, the RC1587T33 is discontinued and no longer manufactured.

What is the maximum output current of the RC1587T33?

The RC1587T33 has a maximum output current capability of 3A.

What is the recommended input voltage range for this regulator?

The recommended input voltage range is 5.1V to 7V.