RT9172-25GG Equivalent & Substitute Parts

Part Overview

The RT9172-25GG is a linear voltage regulator IC from Richtek USA Inc. designed for positive fixed 2.5V output applications with 3A current capability in a compact SOT-223 package. This part is classified as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity. The fixed output configuration and specific electrical characteristics define the scope of compatible alternatives.

Substiute Parts

RT9172-25GG

Richtek USA Inc.In Stock: 3028RT9172-25GG Datasheet

Current PartRFQ

RT9059AGQW

Richtek USA Inc.In Stock: 1691RT9059AGQW Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RT9172-25GG is determined by the following critical parameters:

• Output Current Capability: Minimum 3A required
• Output Voltage: Fixed 2.5V or adjustable with external resistor network to achieve 2.5V
• Input Voltage Range: Maximum 5.5V support
• Dropout Voltage: Performance at 3A output current
• Regulatory Compliance: ROHS3 and REACH status alignment
• Thermal Performance: Operating temperature range compatibility

The RT9059AGQW qualifies as a substitute because it maintains the 3A output current specification, supports the required input voltage range, and provides adjustable output voltage capability that can be configured to 2.5V through external resistor selection. Both parts share identical regulatory compliance status and are manufactured by the same supplier.

Parameter Comparison

Engineering Selection Recommendations

The RT9059AGQW is an active product from the same manufacturer, providing continuity for designs currently using the obsolete RT9172-25GG. Both components maintain identical regulatory compliance certifications (ROHS3, REACH Unaffected) and moisture sensitivity specifications.

Key considerations for selection:

• Output Voltage Configuration: The RT9059AGQW requires external resistor network design to establish 2.5V output, whereas the RT9172-25GG provides fixed 2.5V output. Design modification is necessary.
• Dropout Performance: The RT9059AGQW demonstrates superior dropout voltage (0.45V vs 0.7V @ 3A), reducing thermal dissipation requirements.
• Quiescent Current: The RT9059AGQW exhibits lower quiescent current (1.2 mA vs 3 mA), improving efficiency in standby conditions.
• Package Transition: Migration from SOT-223 to 10-WDFN (3x3) requires PCB layout modification.
• Temperature Range: The RT9172-25GG supports extended upper temperature operation (125°C vs 85°C). Applications requiring operation above 85°C require alternative solutions.

Frequently Asked Questions (FAQ)

Q: Can the RT9059AGQW directly replace the RT9172-25GG without circuit modification?

A: No. The RT9059AGQW is an adjustable output regulator requiring external resistor network configuration to achieve 2.5V output. The RT9172-25GG provides fixed 2.5V output. Circuit design changes are mandatory.

Q: What is the package difference between these parts?

A: The RT9172-25GG uses SOT-223 (TO-261-4) package, while the RT9059AGQW uses 10-WDFN (3x3) package. PCB layout and footprint redesign is required.

Q: Are both parts RoHS compliant?

A: Yes. Both the RT9172-25GG and RT9059AGQW are ROHS3 compliant and REACH unaffected.

Q: Which part has better thermal performance?

A: The RT9059AGQW exhibits lower dropout voltage (0.45V @ 3A compared to 0.7V @ 3A), resulting in reduced power dissipation and improved thermal performance at full 3A output current.

Q: What is the maximum operating temperature for each part?

A: The RT9172-25GG operates from -40°C to 125°C. The RT9059AGQW operates from -40°C to 85°C. Applications requiring operation above 85°C cannot use the RT9059AGQW.

Q: Is the RT9059AGQW currently available?

A: Yes. The RT9059AGQW is classified as active product status with 1594 pieces in stock, compared to the obsolete RT9172-25GG.