RT9711DGS Equivalent & Substitute Parts

Part Overview

The RT9711DGS is an active N-Channel power switch manufactured by Richtek USA Inc., designed for USB switching applications. This 8-SOP surface mount device delivers 600mA maximum output current with integrated fault protection including current limiting, over-temperature shutdown, reverse current blocking, and under-voltage lockout (UVLO). The part is RoHS3 compliant and currently in active production status with 1,077 units in stock.

Substitute parts are identified when equivalent functional performance can be achieved within the specified electrical and mechanical parameters of the power switch category, particularly for applications where the primary part is unavailable or when alternative packaging or current ratings better suit system requirements.

Substiute Parts

RT9711DGS

Richtek USA Inc.In Stock: 1169RT9711DGS 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 RT9711DGS is determined by the following core parameters:

• Package Compatibility: All substitute parts must use 8-SOIC (0.154", 3.90mm Width) surface mount packaging to ensure PCB footprint compatibility
• Output Configuration: High side N-Channel 1:1 topology with On/Off interface control
• Voltage Range: Load voltage operation within or overlapping the 2.5V ~ 5.5V specification
• Fault Protection: Minimum requirement of current limiting, over-temperature protection, and UVLO functionality
• Current Rating: Output current capacity sufficient for the application requirement

The identified substitute parts (STMPS2141MTR, STMPS2161MTR, TPS2049D, TPS2049DR) share the same package footprint and core switching architecture. Differences in maximum output current, on-resistance, and input logic type create distinct application scenarios where each part may serve as an alternative.

Parameter Comparison

Engineering Selection Recommendations

STMPS2141MTR (STMicroelectronics): This part provides 500mA output current with 110mOhm on-resistance and non-inverting input logic matching the RT9711DGS control interface. The 2.7V minimum load voltage represents a 0.2V offset from the primary part. All fault protection features are present. This substitute is suitable for applications requiring slightly reduced current capacity while maintaining control signal compatibility.

STMPS2161MTR (STMicroelectronics): This part delivers 1A maximum output current, exceeding the RT9711DGS specification by 400mA. The 110mOhm on-resistance and non-inverting input logic are equivalent to STMPS2141MTR. This substitute accommodates higher current demands within the same package and control interface, with identical fault protection and temperature range specifications.

TPS2049D and TPS2049DR (Texas Instruments): Both variants provide 100mA output current with 400mOhm on-resistance. The inverting input logic requires control signal inversion in the application circuit. The operating temperature range is limited to -40°C ~ 85°C (TA) compared to the RT9711DGS junction temperature specification. These parts lack reverse current protection. These substitutes are applicable only to low-current applications with modified control logic and reduced thermal operating range.

All substitute parts maintain RoHS3 compliance and active product status. Selection depends on current requirement alignment, control signal polarity compatibility, and thermal operating range requirements.

Frequently Asked Questions (FAQ)

Q: Can STMPS2161MTR directly replace RT9711DGS in a USB switching application?

A: Yes, within current capacity constraints. The STMPS2161MTR provides higher current capability (1A vs. 600mA), identical package footprint (8-SOIC), matching non-inverting input logic, and equivalent fault protection. No circuit modifications are required for control signal interfacing.

Q: What is the primary limitation of TPS2049D and TPS2049DR as substitutes?

A: The 100mA maximum output current is significantly lower than the RT9711DGS 600mA rating, limiting application to low-current switching scenarios. Additionally, the inverting input logic requires control signal inversion in the application circuit, and the absence of reverse current protection removes one fault protection feature present in the primary part.

Q: Are all substitute parts available in the same packaging options as RT9711DGS?

A: All substitute parts use identical 8-SOIC (0.154", 3.90mm Width) surface mount packaging, ensuring PCB footprint compatibility. Packaging formats (Cut Tape, Tape & Reel, Tube) vary by supplier and part number but do not affect electrical or mechanical compatibility.

Q: What is the voltage range compatibility between RT9711DGS and its substitutes?

A: The RT9711DGS operates at 2.5V ~ 5.5V load voltage. STMPS2141MTR and STMPS2161MTR operate at 2.7V ~ 5.5V, creating a 0.2V minimum offset. TPS2049D and TPS2049DR also operate at 2.7V ~ 5.5V. Applications requiring operation below 2.7V load voltage must use the primary RT9711DGS part.

Q: How do on-resistance differences affect thermal performance?

A: The RT9711DGS and STMicroelectronics substitutes (STMPS2141MTR, STMPS2161MTR) share 90mOhm and 110mOhm on-resistance values respectively, producing comparable power dissipation at equivalent current levels. TPS2049D and TPS2049DR exhibit 400mOhm on-resistance, generating significantly higher heat at the same current, but this is offset by their 100mA maximum current rating.

Q: What is the impact of input logic inversion in TPS2049 variants?

A: The TPS2049D and TPS2049DR require inverted control signals compared to the RT9711DGS. If the application circuit provides active-high enable signals for the primary part, the TPS2049 variants require active-low enable signals. This necessitates either logic inversion in the control circuit or firmware modification if the control signal originates from a microcontroller.