RT9715FGS Equivalent & Substitute Parts

Part Overview

The RT9715FGS is a Power Management IC (PMIC) manufactured by Richtek USA Inc., functioning as an N-Channel power switch driver with 1:1 input-output ratio and high-side output configuration. Designed for USB switching applications, this component operates across a 2.7V to 5.5V load voltage range with 1.1A maximum output current and 90mOhm typical on-resistance. The part is currently classified as obsolete, necessitating identification of functionally equivalent alternatives from active product lines to maintain design continuity and ensure long-term component availability.

Substiute Parts

RT9715FGS

Richtek USA Inc.In Stock: 891RT9715FGS Datasheet

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MIC2544-2YMM

Microchip TechnologyIn Stock: 45840MIC2544-2YMM Datasheet

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STMPS2141MTR

STMicroelectronicsIn Stock: 41524STMPS2141MTR Datasheet

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STMPS2161MTR

STMicroelectronicsIn Stock: 17724STMPS2161MTR Datasheet

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TPS2049D

Texas InstrumentsIn Stock: 1943TPS2049D Datasheet

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TPS2049DR

Texas InstrumentsIn Stock: 3710TPS2049DR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RT9715FGS is determined by the following critical parameters:

• Output Configuration: High-side N-channel 1:1 topology
• Voltage Range: 2.7V to 5.5V load voltage compatibility
• Interface Type: On/Off control with non-inverting input logic
• Fault Protection: Current limiting, over-temperature, and reverse current protection
• Package Compatibility: 8-pin SOIC or equivalent footprint (8-MSOP acceptable with layout verification)

Substitute parts must maintain compatibility across these core electrical and mechanical specifications. Current output capacity, on-resistance, and operating temperature range may vary within acceptable design margins depending on application requirements. Parts with inverting input logic (TPS2049 series) require signal inversion in control circuitry and are suitable only for applications where this modification is feasible.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Direct Compatibility)

STMPS2161MTR and STMPS2141MTR from STMicroelectronics provide the closest functional alignment with RT9715FGS. Both maintain identical load voltage range, non-inverting input logic, and comprehensive fault protection including reverse current and UVLO. STMPS2161MTR offers 1A output current matching the original specification, while STMPS2141MTR provides 500mA capacity suitable for lower-current applications. Both are active products with ROHS3 compliance and extended operating temperature range to 125°C.

Secondary Substitute (Higher Current Capacity)

MIC2544-2YMM from Microchip Technology delivers 1.5A output current with superior on-resistance (80mOhm) and is actively manufactured. This part maintains voltage compatibility and non-inverting input logic. Package footprint differs (8-MSOP vs. 8-SOIC), requiring PCB layout verification. Moisture sensitivity level is superior (MSL 1 vs. MSL 3).

Limited Substitutes (Application-Specific)

TPS2049D and TPS2049DR from Texas Instruments feature inverting input logic, requiring control signal inversion in the application circuit. Maximum output current is limited to 100mA with significantly higher on-resistance (400mOhm). These parts are suitable only for low-current switching applications where input signal inversion is acceptable. Both are active products with ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can STMPS2161MTR directly replace RT9715FGS without PCB modifications?

A: Yes. STMPS2161MTR maintains identical 8-SOIC package footprint, load voltage range (2.7V–5.5V), non-inverting input logic, and comprehensive fault protection. Pin-to-pin compatibility allows direct substitution on existing PCB layouts.

Q: What is the key difference between STMPS2161MTR and STMPS2141MTR?

A: Output current capacity differs: STMPS2161MTR provides 1A maximum, while STMPS2141MTR provides 500mA maximum. Both share identical voltage range, package, and protection features. Selection depends on application current requirements.

Q: Why does MIC2544-2YMM require layout verification despite electrical compatibility?

A: MIC2544-2YMM uses 8-MSOP package (0.118" width) versus RT9715FGS 8-SOIC package (0.154" width). Pin spacing differs, requiring PCB footprint redesign. Electrical functionality remains compatible after layout adjustment.

Q: Can TPS2049 series parts be used as direct substitutes?

A: TPS2049D and TPS2049DR feature inverting input logic, requiring control signal inversion in the application circuit. Additionally, 100mA output current and 400mOhm on-resistance limit use to low-current switching applications. These parts are suitable only when application design accommodates input signal inversion.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance, matching the original RT9715FGS specification.

Q: What is the impact of operating temperature range differences?

A: RT9715FGS operates to 100°C (TJ), while STMPS2161MTR and STMPS2141MTR extend to 125°C (TJ). TPS2049 series and MIC2544-2YMM are rated to 85°C (TA). Application thermal environment determines whether extended temperature range is required.