FAN1084D33X

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

The FAN1084D33X is a low dropout three-terminal linear regulator manufactured by Fairchild Semiconductor, part of the FAN1084 series. It provides a fixed output voltage of 3.3V with a maximum output current capability of 4.5A. The device is designed for low voltage applications where transient response and minimum input voltage are critical, such as VTT bus termination. It operates with an input supply of 5V or less. The component features fast transient response and low dropout voltage characteristics. On-chip thermal limiting protects against excessive junction temperatures caused by overload or high ambient conditions.

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

• Provides fixed 3.3V output at 4.5A current capability
• Optimized for low voltage microprocessor applications requiring regulated output from 1.5V to 3.6V
• Features on-chip thermal limiting for protection against overload and high ambient temperature
• Delivers fast transient response and low dropout voltage performance

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

• Desktop PCs and RISC/Embedded processors' supply
• GTL and SSTL logic reference bus supply
• Low voltage VCC logic supply
• Post regulator for switching supplies
• Cable and ADSL modems' DSP core supply

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

Verify the specific suffix 'X' in the part number FAN1084D33X against official Fairchild Semiconductor documentation to confirm package type and tape/reel specifications. Confirm availability status as distribution data may indicate end-of-life or discontinuation. Ensure compatibility with TO-252AA packages if applicable. Cross-reference with onsemi resources following corporate mergers for updated lifecycle information.

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

Select this component for applications requiring a stable 3.5V rail derived from a 5V source with high current demands up to 4.5A. Consider the low dropout characteristic for efficiency in low voltage differential applications. Evaluate thermal management requirements due to power dissipation at full load. Compare against adjustable variants if flexible voltage settings are needed instead of the fixed 3.3V output.

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

The FAN1084 series includes adjustable (FAN1084), fixed 1.5V (FAN1084-1.5), and fixed 3.3V (FAN1084-3.3) regulators. The FAN1084D33X corresponds to the fixed 3.3V variant. These devices are industry-standard LDOs optimized for processor core voltages and bus termination. They are available in TO-220, TO-263 center cut, and TO-252 packages, catering to various thermal and space constraints in consumer and industrial electronics.

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

Public confirmed substitute part numbers include AP1084D33L-13 from Diodes Incorporated, which offers similar 5A current capability and 3.3V fixed output in a TO-252-3 package. Verify pinout compatibility and thermal performance metrics before substitution.