RT9166A-25GG Equivalent & Substitute Parts

Part Overview

The RT9166A-25GG is a linear voltage regulator IC manufactured by Richtek USA Inc., designed to deliver a fixed 2.5V output at 600mA in a surface mount SOT-223 package. This device is classified as a Power Management (PMIC) component and maintains Active product status. Linear voltage regulators of this specification are essential in applications requiring stable, low-noise power delivery with minimal component count. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained across the specified parameter range.

Substiute Parts

RT9166A-25GG

Richtek USA Inc.In Stock: 2780RT9166A-25GG Datasheet

Current PartRFQ

AP7365-25EG-13

Diodes IncorporatedIn Stock: 170212AP7365-25EG-13 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RT9166A-25GG are identified based on the following critical parameters that determine functional equivalence:

• Fixed output voltage of 2.5V
• Output current capability of 600mA minimum
• Surface mount SOT-223 package compatibility
• Operating temperature range of -40°C to 85°C minimum
• Over current and over temperature protection features
• Active product status and RoHS3 compliance

The AP7365-25EG-13 meets these substitution criteria through matching output voltage, current rating, package type, temperature range, and protection features. Variations in secondary parameters such as quiescent current, PSRR, and maximum input voltage do not preclude substitution when the primary electrical and mechanical requirements are satisfied.

Parameter Comparison

Engineering Selection Recommendations

Both the RT9166A-25GG and AP7365-25EG-13 are Active status components with ROHS3 compliance and REACH unaffected designation. The AP7365-25EG-13 demonstrates improved performance characteristics in dropout voltage and quiescent current consumption, with higher maximum input voltage tolerance. Selection between these parts should be based on design requirements for input voltage headroom, power dissipation constraints, and moisture sensitivity considerations. The MSL rating difference reflects different manufacturing and storage requirements, with the AP7365-25EG-13 offering less restrictive handling conditions.

Frequently Asked Questions (FAQ)

Q: Can the AP7365-25EG-13 directly replace the RT9166A-25GG in existing designs?

A: Yes, when the design input voltage does not exceed 5.5V. Both devices provide identical 2.5V fixed output at 600mA with matching SOT-223 package pinouts and operating temperature ranges. PCB layout compatibility is maintained.

Q: What is the significance of the SOT-223 versus SOT-223-3 package designation?

A: Both designations refer to the same physical SOT-223 package form factor with four leads (TO-261-4, TO-261AA). The "-3" suffix in the AP7365 designation indicates a three-terminal configuration within the four-lead package, which is standard for linear regulators.

Q: How do the quiescent current differences affect circuit design?

A: The AP7365-25EG-13 draws 80 µA versus 300 µA for the RT9166A-25GG. In battery-powered or low-power standby applications, this 220 µA difference may be significant. In standard powered applications, this difference is typically negligible.

Q: Are there moisture sensitivity implications for long-term storage?

A: The RT9166A-25GG requires MSL 3 handling (168-hour floor life after moisture exposure), while the AP7365-25EG-13 is MSL 1 (unlimited floor life). The AP7365-25EG-13 offers less restrictive storage and handling requirements.

Q: What does the improved PSRR specification of the AP7365-25EG-13 mean?

A: The AP7365-25EG-13 provides 65dB PSRR versus 55dB for the RT9166A-25GG at 1kHz. This indicates superior rejection of input voltage ripple and noise, resulting in cleaner output voltage in applications with noisy power sources.