RT9173APM5 Equivalent & Substitute Parts

Part Overview

The RT9173APM5 is a DDR Bus Termination Regulator manufactured by Richtek USA Inc., classified as a Power Management IC (PMIC) with single output capability. This component operates across an input voltage range of 1.6V to 6V with adjustable output voltage, housed in a TO-263-5 package. The part is currently listed as obsolete, necessitating identification of active equivalent alternatives that maintain functional compatibility for DDR bus termination applications while accommodating different packaging and electrical specifications.

Substiute Parts

RT9173APM5

Richtek USA Inc.In Stock: 2142RT9173APM5 Datasheet

Current PartRFQ

RT9026GFP

Richtek USA Inc.In Stock: 20651RT9026GFP Datasheet

SimilarRFQ

RT9040GQW

Richtek USA Inc.In Stock: 3758RT9040GQW Datasheet

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RT9045GSP

Richtek USA Inc.In Stock: 62905RT9045GSP Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the RT9173APM5 is determined by the following critical parameters:

Functional Requirements:

• Single output voltage regulator for DDR bus termination applications
• Surface mount technology
• Operating temperature range: -40°C ~ 85°C
• RoHS3 compliance and MSL-3 rating

Electrical Compatibility Criteria:

• Input voltage range overlap with original specification (1.6V ~ 6V)
• Adjustable or fixed output voltage capability suitable for DDR termination
• Single output configuration

Package Considerations: Substitute parts may utilize different package types (10-MSOP-EP, 10-WDFN, 8-SOP-EP) provided they maintain surface mount compatibility and thermal management characteristics appropriate for the application.

The three identified substitutes (RT9026GFP, RT9040GQW, RT9045GSP) are all active products from the same manufacturer, share identical operating temperature ranges, and maintain compliance certifications. Each offers distinct input voltage ranges and package options to accommodate various PCB layout and thermal requirements.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts are active products with current manufacturing status, ensuring long-term availability and supply chain stability compared to the obsolete RT9173APM5. Each substitute maintains identical compliance certifications (ROHS3, REACH Unaffected, EAR99 classification) and moisture sensitivity ratings.

RT9045GSP offers the widest input voltage range (1V ~ 5.5V), providing maximum flexibility for applications with variable supply voltages. The 8-SOP-EP package presents the smallest footprint among substitutes with highest inventory availability (62,800 pcs).

RT9026GFP operates within a narrower input range (3.15V ~ 5.5V) suitable for stable supply environments. The 10-MSOP-EP package provides moderate pin density with substantial inventory (20,578 pcs).

RT9040GQW is optimized for lower input voltage applications (1.1V ~ 4.6V) and features a compact 10-WDFN (3x3) package with integrated thermal management. Inventory availability is 3,654 pcs.

Selection should be based on specific input voltage requirements of the target application and PCB layout constraints imposed by package geometry.

Frequently Asked Questions (FAQ)

Q: Can RT9045GSP directly replace RT9173APM5 without circuit modifications?

A: Functional replacement is possible due to shared DDR bus termination regulator application and identical operating temperature range. However, package geometry differs (8-SOP-EP versus TO-263-5), requiring PCB layout redesign. Input voltage range compatibility (1V ~ 5.5V for RT9045GSP versus 1.6V ~ 6V for RT9173APM5) must be verified against your specific supply voltage.

Q: What are the key differences between the three substitute options?

A: Input voltage ranges differ: RT9045GSP (1V ~ 5.5V) covers the widest range, RT9026GFP (3.15V ~ 5.5V) is mid-range, and RT9040GQW (1.1V ~ 4.6V) targets lower voltage applications. Package types vary: 8-SOP-EP, 10-MSOP-EP, and 10-WDFN respectively, affecting PCB footprint and thermal characteristics.

Q: Are all substitutes RoHS compliant?

A: Yes. All three substitute parts maintain ROHS3 compliance, identical to the original RT9173APM5, ensuring regulatory compatibility for applications requiring RoHS certification.

Q: How do package differences affect thermal performance?

A: The TO-263-5 original package includes a tab for enhanced heat dissipation. Substitute packages (8-SOP-EP, 10-MSOP-EP, 10-WDFN) incorporate exposed pads for thermal management. Thermal performance depends on PCB copper area allocation and via placement around the exposed pad.

Q: Which substitute has the best inventory availability?

A: RT9045GSP offers the highest inventory level at 62,800 pcs, followed by RT9026GFP at 20,578 pcs, and RT9040GQW at 3,654 pcs.

Q: Do all substitutes support adjustable output voltage?

A: The original RT9173APM5 specifies adjustable output voltage. Substitute parts list output voltage as not specified in provided documentation. Application circuit design must accommodate the output voltage configuration of the selected substitute.