RT9711CGS Equivalent & Substitute Parts

Part Overview

The RT9711CGS is an active N-Channel power switch manufactured by Richtek USA Inc., designed for USB switching applications. This 1:1 ratio power switch operates at 600mA maximum output current with a typical on-resistance of 90mOhm. The device is housed in an 8-SOIC package and includes integrated fault protection features including current limiting, over-temperature protection, reverse current blocking, and under-voltage lockout (UVLO). The RT9711CGS maintains active product status with 850 units in current inventory. Equivalent and substitute parts are identified for applications requiring alternative sourcing, higher current capacity, or different supplier availability.

Substiute Parts

RT9711CGS

Richtek USA Inc.In Stock: 956RT9711CGS Datasheet

Current PartRFQ

STMPS2151MTR

STMicroelectronicsIn Stock: 22766STMPS2151MTR Datasheet

SimilarRFQ

STMPS2171MTR

STMicroelectronicsIn Stock: 18003STMPS2171MTR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RT9711CGS are qualified based on the following critical parameters that determine functional equivalence:

Core Substitution Criteria:

• Output configuration: High Side N-Channel
• Ratio: 1:1 input-to-output
• Interface: On/Off control
• Input type: Non-Inverting
• Fault protection: Current Limiting (Fixed), Over Temperature, Reverse Current, UVLO
• Package: 8-SOIC (0.154", 3.90mm Width)
• Operating temperature range: -40°C ~ 125°C (TJ)
• Mounting type: Surface Mount
• Compliance: ROHS3 Compliant

Allowable Parameter Variations:

• Load voltage range: 2.7V ~ 5.5V (encompasses RT9711CGS range of 2.5V ~ 5.5V)
• Output current: 500mA minimum (RT9711CGS operates at 600mA; higher current ratings are acceptable)
• Rds On: Up to 110mOhm (RT9711CGS typical 90mOhm; higher resistance acceptable within thermal limits)
• MSL rating: 1 (Unlimited) is superior to RT9711CGS MSL 3

The identified substitutes maintain identical package geometry, electrical interface, protection architecture, and compliance certifications while offering alternative sourcing from STMicroelectronics.

Parameter Comparison

Engineering Selection Recommendations

STMPS2151MTR Substitution: The STMPS2151MTR is suitable for applications where output current does not exceed 500mA. This part maintains all core electrical and mechanical specifications of the RT9711CGS, including identical package geometry, fault protection architecture, and operating temperature range. The STMPS2151MTR offers improved moisture sensitivity (MSL 1 vs. MSL 3), reducing handling and storage constraints. Load voltage compatibility spans 2.7V to 5.5V, encompassing the RT9711CGS operating range. Current inventory of 22,700 units provides extended availability.

STMPS2171MTR Substitution: The STMPS2171MTR is suitable for applications requiring output current up to 1A, providing 67% higher current capacity than the RT9711CGS. This part is functionally equivalent across all core parameters and offers the same improved MSL rating (1 vs. 3). The STMPS2171MTR is appropriate for designs where the RT9711CGS current rating is marginal or where future current headroom is required. Current inventory of 17,900 units supports production requirements.

Both substitutes maintain ROHS3 compliance and active product status, ensuring long-term supply chain viability.

Frequently Asked Questions (FAQ)

Q: Can STMPS2151MTR directly replace RT9711CGS in existing designs? A: Yes, for applications where maximum output current does not exceed 500mA. The STMPS2151MTR maintains identical package geometry (8-SOIC), pin configuration, electrical interface (On/Off control), and fault protection features. No PCB layout modifications are required. Verify that your application's maximum load current does not exceed 500mA.

Q: What is the primary difference between STMPS2151MTR and STMPS2171MTR? A: The maximum output current rating differs: STMPS2151MTR is rated for 500mA, while STMPS2171MTR is rated for 1A. Both parts are electrically and mechanically equivalent to the RT9711CGS in all other parameters. Select based on your application's current requirements.

Q: Are there pin-to-pin compatibility concerns? A: No. All three parts use the 8-SOIC package with identical 0.154" width and 3.90mm dimensions. Pin assignments and functional interface (On/Off control) are identical across all parts.

Q: What is the significance of MSL rating differences? A: The RT9711CGS carries MSL 3 (168 hours), requiring moisture bake-out procedures before reflow soldering if storage exceeds 168 hours in standard humidity conditions. STMPS2151MTR and STMPS2171MTR carry MSL 1 (Unlimited), eliminating moisture sensitivity constraints and simplifying supply chain handling.

Q: Are all three parts RoHS compliant? A: Yes. RT9711CGS, STMPS2151MTR, and STMPS2171MTR are all ROHS3 Compliant, meeting environmental and regulatory requirements for commercial and industrial applications.

Q: Which substitute should I select for a new design? A: Select STMPS2171MTR for new designs unless current budget constraints or thermal considerations limit your application to 500mA. The STMPS2171MTR provides maximum design flexibility with 1A capacity and improved MSL handling characteristics.