RT9741AGV Equivalent & Substitute Parts

Part Overview

The RT9741AGV is a Power Switch/Driver IC manufactured by Richtek USA Inc., designed for high-side N-channel switching applications with 1.5A output capability in a compact SOT-23-3 package. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. The part operates across a 2.7V to 5.5V load voltage range with integrated fault protection including current limiting, over-temperature monitoring, reverse current protection, and under-voltage lockout (UVLO).

Substiute Parts

RT9741AGV

Richtek USA Inc.In Stock: 33124RT9741AGV Datasheet

Current PartRFQ

RT9742KNGV

Richtek USA Inc.In Stock: 677RT9742KNGV Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RT9741AGV is determined by strict alignment across the following critical parameters:

• Switch Configuration: High-side N-channel output with 1:1 input-to-output ratio
• Current Rating: Maximum output current of 1.5A
• Voltage Range: Load voltage compatibility within or exceeding 2.7V ~ 5.5V specification
• Package Compatibility: Identical SOT-23-3 surface mount package
• Fault Protection: Presence of current limiting, over-temperature, reverse current, and UVLO protection
• Operating Temperature: -40°C ~ 85°C range
• Compliance: ROHS3 compliance and MSL 3 rating

The RT9742KNGV meets all substitution criteria as a direct functional equivalent from the same manufacturer, with enhanced electrical performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

The RT9742KNGV is a direct substitute for the obsolete RT9741AGV. Both parts maintain identical functional specifications, package form factor, and compliance certifications. The RT9742KNGV offers improved on-resistance performance (70mOhm versus 100mOhm) and extended load voltage range (2.7V ~ 6V versus 2.7V ~ 5.5V), providing enhanced thermal efficiency and broader application compatibility. The substitute part carries active product status with current manufacturing availability, ensuring long-term supply chain reliability. Both parts maintain ROHS3 compliance and identical MSL ratings, supporting equivalent handling and storage requirements in production environments.

Frequently Asked Questions (FAQ)

Q: Can the RT9742KNGV directly replace the RT9741AGV without PCB modifications?

A: Yes. Both parts share identical SOT-23-3 package geometry, pin configuration, and functional interface. No PCB layout changes are required for direct substitution.

Q: What are the key differences between these parts?

A: The RT9742KNGV features lower on-resistance (70mOhm versus 100mOhm) and extended load voltage range (2.7V ~ 6V versus 2.7V ~ 5.5V). These represent performance enhancements rather than functional changes.

Q: Are there any compliance or certification differences?

A: No. Both parts maintain identical ROHS3 compliance status and MSL 3 ratings. Handling, storage, and environmental requirements remain unchanged.

Q: Why is the RT9741AGV marked as obsolete?

A: Product obsolescence reflects manufacturer lifecycle decisions. The RT9742KNGV represents the active continuation of this product line with equivalent or superior electrical characteristics.

Q: What is the impact of the lower on-resistance in the RT9742KNGV?

A: Lower on-resistance reduces power dissipation and heat generation during switching operations, improving overall circuit efficiency and thermal performance.

Q: Are both parts suitable for USB switching applications?

A: Yes. Both parts are classified as USB switches with identical switching topology, current rating, and protection features for USB power delivery and load switching applications.