RT9166A-33GG Equivalent & Substitute Parts

Part Overview

The RT9166A-33GG is a linear voltage regulator IC manufactured by Richtek USA Inc., designed to deliver a fixed 3.3V output at 600mA in a surface-mount SOT-223 package. This device is classified as a Power Management IC (PMIC) and is currently in active production status. Linear regulators of this specification are essential in applications requiring stable, low-noise 3.3V power rails with moderate current demands. Substitute parts are identified when equivalent electrical performance, package compatibility, and compliance certifications align with the original specification.

Substiute Parts

RT9166A-33GG

Richtek USA Inc.In Stock: 3434RT9166A-33GG Datasheet

Current PartRFQ

AP7365-33ERG-13

Diodes IncorporatedIn Stock: 8142AP7365-33ERG-13 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RT9166A-33GG is determined by the following critical parameters:

• Fixed output voltage of 3.3V
• Output current capability of 600mA minimum
• Surface-mount SOT-223 package compatibility (TO-261-4 or TO-261AA case)
• Maximum input voltage rating of 5.5V or higher
• Operating temperature range of -40°C to 85°C or wider
• Active product status and RoHS3 compliance

The AP7365-33ERG-13 manufactured by Diodes Incorporated meets all substitution criteria. Both devices share identical output voltage, current rating, package form factor, and compliance certifications. Functional equivalence is established through matching electrical specifications within the allowed parameter ranges.

Parameter Comparison

Engineering Selection Recommendations

Both the RT9166A-33GG and AP7365-33ERG-13 are active-status products with ROHS3 compliance and REACH unaffected certification. The AP7365-33ERG-13 demonstrates superior electrical performance in dropout voltage and quiescent current specifications, while maintaining identical output voltage, current rating, and package compatibility. Selection between these devices should be based on application-specific requirements for efficiency, thermal performance, and supply voltage headroom. Both devices are suitable for direct substitution in 3.3V linear regulator applications requiring 600mA output current in SOT-223 surface-mount packages.

Frequently Asked Questions (FAQ)

Q: Can the AP7365-33ERG-13 directly replace the RT9166A-33GG on a PCB?

A: Yes. Both devices use the SOT-223 package with identical pin configurations (TO-261-4, TO-261AA). No PCB layout modifications are required for direct substitution.

Q: What are the key electrical differences between these parts?

A: The AP7365-33ERG-13 offers lower dropout voltage (0.4V vs. 0.58V at 600mA) and lower quiescent current (80 µA vs. 300 µA), resulting in improved efficiency and reduced heat dissipation. Both devices deliver identical 3.3V output at 600mA.

Q: Are there input voltage rating differences?

A: The AP7365-33ERG-13 is rated for 6V maximum input, compared to 5.5V for the RT9166A-33GG. This provides additional headroom in applications with higher supply voltages.

Q: Do both parts meet the same compliance standards?

A: Yes. Both devices are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 and HTSUS 8542.39.0001.

Q: What is the difference between SOT-223 and SOT-223R packaging?

A: SOT-223R is a tape-and-reel variant of the standard SOT-223 package. The footprint and electrical characteristics remain identical; the difference is in the supply format and moisture sensitivity level (MSL 1 for AP7365 vs. MSL 3 for RT9166A).

Q: Which part should be selected for new designs?

A: Both parts are suitable for new designs. The AP7365-33ERG-13 is recommended when efficiency and lower quiescent current are priorities. The RT9166A-33GG remains a valid choice for applications with established supply voltage constraints at 5.5V or below.