RT9702GB Equivalent & Substitute Parts

Part Overview

The RT9702GB is a Power Management IC (PMIC) functioning as a USB Power Switch with N-Channel output configuration. This Surface Mount device in SOT-23-5 packaging delivers 500mA maximum output current with 80mOhm typical on-resistance. The part is classified as Obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity. Active alternatives with enhanced specifications are available from the same manufacturer.

Substiute Parts

RT9702GB

Richtek USA Inc.In Stock: 5236RT9702GB Datasheet

Current PartRFQ

RT9742UNGJ5

Richtek USA Inc.In Stock: 2112RT9742UNGJ5 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RT9702GB is determined by strict alignment of the following electrical and mechanical parameters:

Critical Substitution Criteria:

• Switch Type: USB Switch (fixed requirement)
• Output Configuration: High Side, N-Channel, 1:1 ratio (fixed requirement)
• Interface: On/Off control (fixed requirement)
• Input Type: Non-Inverting (fixed requirement)
• Mounting Type: Surface Mount (fixed requirement)
• Package Compatibility: SOT-23-5 form factor (physical constraint)

Allowable Parameter Variations:

• Current - Output (Max): Equal to or greater than 500mA
• Voltage - Load: Must encompass or exceed the 2V ~ 5.5V range
• Rds On (Typ): Lower values acceptable (improved performance)
• Operating Temperature: Range adjustments acceptable based on application requirements
• Fault Protection Features: Superset of original protection acceptable

The RT9742UNGJ5 qualifies as a direct substitute based on these criteria, offering enhanced current capacity (1.5A), improved on-resistance (70mOhm), and extended voltage range (2.7V ~ 6V) while maintaining identical functional topology and package form factor.

Parameter Comparison

Engineering Selection Recommendations

The RT9742UNGJ5 is the qualified substitute for the obsolete RT9702GB based on the following engineering factors:

Product Status Alignment: The RT9742UNGJ5 maintains Active product status, ensuring long-term availability, manufacturing support, and continued compliance updates. The RT9702GB's Obsolete classification necessitates transition to an active alternative.

Regulatory Compliance: Both components maintain ROHS3 Compliant and REACH Unaffected certifications, satisfying environmental and hazardous substance requirements. MSL ratings are identical at Level 3 (168 Hours), maintaining equivalent moisture handling requirements.

Functional Equivalence: The substitute preserves the identical functional topology (High Side N-Channel USB Switch, 1:1 ratio, On/Off interface, Non-Inverting input) required for direct circuit replacement.

Performance Enhancement: The RT9742UNGJ5 provides superior electrical characteristics within the same package form factor: increased current capacity (1.5A vs. 500mA), reduced on-resistance (70mOhm vs. 80mOhm), and extended voltage range (2.7V ~ 6V vs. 2V ~ 5.5V). These enhancements are backward-compatible with existing designs.

Package Consideration: Both components use SOT-23-5 form factor variants (SOT-753 vs. TSOT-23-5). The TSOT-23-5 designation indicates a thin profile variant, which is mechanically compatible with standard SOT-23-5 PCB footprints.

Frequently Asked Questions (FAQ)

Q: Can the RT9742UNGJ5 directly replace the RT9702GB on existing PCBs?

A: Yes. Both components share identical functional topology, control interface, and SOT-23-5 package form factor. The TSOT-23-5 (thin variant) is mechanically compatible with standard SOT-23-5 footprints. No circuit modifications are required.

Q: What are the key differences between these parts?

A: The RT9742UNGJ5 provides three primary enhancements: maximum output current increased from 500mA to 1.5A, typical on-resistance reduced from 80mOhm to 70mOhm, and load voltage range extended from 2V ~ 5.5V to 2.7V ~ 6V. Both maintain identical protection features and compliance certifications.

Q: Is the higher current rating of the RT9742UNGJ5 backward-compatible?

A: Yes. Higher current capacity is a superset capability. Designs operating the RT9702GB at or below 500mA will function identically with the RT9742UNGJ5. The substitute will not force higher current draw in existing circuits.

Q: Are there thermal or operating temperature differences?

A: The RT9702GB specifies junction temperature range (-40°C ~ 125°C TJ), while the RT9742UNGJ5 specifies ambient temperature range (-40°C ~ 85°C TA). For applications within -40°C ~ 85°C ambient conditions, both are equivalent. Applications requiring operation above 85°C ambient should evaluate thermal performance based on actual power dissipation.

Q: What is the significance of the TSOT-23-5 package designation?

A: TSOT-23-5 indicates a thin-profile variant of the SOT-23-5 package. This maintains the same pin pitch, footprint, and electrical connectivity as standard SOT-23-5, ensuring PCB compatibility without layout modifications.

Q: Are moisture sensitivity levels identical?

A: Yes. Both components carry MSL Level 3 (168 Hours) rating, requiring identical handling, storage, and reflow procedures.