RT9166A-25GGL Equivalent & Substitute Parts

Part Overview

The RT9166A-25GGL is a linear voltage regulator IC from Richtek USA Inc. designed for positive fixed output applications. This Surface Mount device delivers 600mA output current at a fixed 2.5V output voltage with a maximum dropout voltage of 0.58V at rated current. The part is Active status and ROHS3 compliant, making it suitable for modern electronic applications requiring regulated 2.5V power delivery in compact form factors.

Substitute parts are identified when design flexibility, inventory availability, or supply chain optimization requires alternative sources while maintaining electrical and mechanical compatibility within the specified parameter ranges.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	2.5V
Output Current	600mA
Input Voltage (Max)	5.5V
Dropout Voltage (Max)	0.58V @ 600mA
Quiescent Current	300 µA
PSRR	55dB (1kHz)
Operating Temperature	-40°C ~ 85°C
Package Type	SOT-223 (TO-261-4, TO-261AA)
Protection Features	Over Current, Over Temperature
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the RT9166A-25GGL are identified based on strict electrical and mechanical parameter alignment:

Parametric Equivalent (RT9166A-25GG): Identical output voltage (2.5V), output current (600mA), input voltage maximum (5.5V), dropout voltage (0.58V @ 600mA), quiescent current (300 µA), PSRR (55dB at 1kHz), operating temperature range (-40°C ~ 85°C), and package configuration (SOT-223). Differs only in packaging format (Cut Tape & Digi-Reel vs. standard packaging).

Similar Substitute (AP7365-25EG-13): Meets core functional requirements with matching output voltage (2.5V), output current (600mA), and operating temperature range (-40°C ~ 85°C). Shares SOT-223 package type. Differs in input voltage maximum (6V vs. 5.5V), dropout voltage (0.4V vs. 0.58V), quiescent current (80 µA vs. 300 µA), and PSRR (65dB vs. 55dB). Manufacturer is Diodes Incorporated.

Parameter Comparison

Parameter	RT9166A-25GGL	RT9166A-25GG	AP7365-25EG-13
Manufacturer	Richtek USA Inc.	Richtek USA Inc.	Diodes Incorporated
Output Voltage (Fixed)	2.5V	2.5V	2.5V
Output Current	600mA	600mA	600mA
Input Voltage (Max)	5.5V	5.5V	6V
Dropout Voltage (Max)	0.58V @ 600mA	0.58V @ 600mA	0.4V @ 600mA
Quiescent Current	300 µA	300 µA	80 µA
PSRR	55dB (1kHz)	55dB (1kHz)	65dB (1kHz)
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package Type	SOT-223	SOT-223	SOT-223-3
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)

Engineering Selection Recommendations

RT9166A-25GG: Direct parametric equivalent suitable for applications where packaging format flexibility is acceptable. Both parts maintain identical electrical specifications and ROHS3 compliance. Selection between RT9166A-25GGL and RT9166A-25GG depends on procurement packaging requirements (standard vs. Cut Tape & Digi-Reel).

AP7365-25EG-13: Alternative from Diodes Incorporated for applications tolerating performance variations. This part offers lower quiescent current (80 µA vs. 300 µA), improved dropout voltage (0.4V vs. 0.58V), and higher PSRR (65dB vs. 55dB). Higher input voltage rating (6V vs. 5.5V) provides additional design margin. Moisture sensitivity level is superior (MSL 1 vs. MSL 3). All three parts maintain ROHS3 compliance and identical operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can RT9166A-25GG replace RT9166A-25GGL directly? A: Yes. Both parts are parametric equivalents with identical electrical specifications. The difference is packaging format only (Cut Tape & Digi-Reel vs. standard packaging). No circuit modifications are required.

Q: Is AP7365-25EG-13 a direct replacement? A: AP7365-25EG-13 is functionally compatible but not parametrically identical. It maintains the same output voltage (2.5V), output current (600mA), and operating temperature range. However, it differs in dropout voltage, quiescent current, PSRR, and input voltage maximum. Circuit performance may differ in applications sensitive to these parameters.

Q: What are the key differences between RT9166A-25GGL and AP7365-25EG-13? A: The primary differences are: input voltage maximum (5.5V vs. 6V), dropout voltage (0.58V vs. 0.4V), quiescent current (300 µA vs. 80 µA), PSRR (55dB vs. 65dB), and moisture sensitivity level (MSL 3 vs. MSL 1). All three parts share identical output voltage, output current, and operating temperature specifications.

Q: Are all three parts in the same package? A: All three parts use SOT-223 package type with TO-261-4 and TO-261AA case designations. RT9166A-25GGL and RT9166A-25GG use SOT-223, while AP7365-25EG-13 uses SOT-223-3. Pin configurations are compatible for standard applications.

Q: Which part has the best power efficiency? A: AP7365-25EG-13 offers superior power efficiency characteristics with lower quiescent current (80 µA vs. 300 µA) and lower dropout voltage (0.4V vs. 0.58V). These parameters reduce power dissipation in battery-powered or efficiency-critical applications.

Q: Are all parts RoHS compliant? A: Yes. All three parts are ROHS3 compliant and REACH unaffected, meeting modern environmental and regulatory requirements.

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