RT9166-33GV Equivalent & Substitute Parts

Part Overview

The RT9166-33GV is a linear voltage regulator IC manufactured by Richtek USA Inc., designed to provide a fixed 3.3V output at 300mA in a compact SOT-23-3 surface mount package. This device is classified as a Power Management (PMIC) component and maintains Active product status. Alternative equivalent parts may be required due to inventory constraints, packaging preferences, or specific application requirements where substitute devices meet identical electrical and mechanical specifications.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.3V
Output Current	300mA
Input Voltage (Max)	5.5V
Voltage Dropout (Typ)	0.23V @ 300mA
Quiescent Current	300 µA
PSRR	55dB (1kHz)
Package Type	SOT-23-3
Operating Temperature Range	-40°C ~ 85°C
Protection Features	Over Current, Over Temperature
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the RT9166-33GV are classified based on strict electrical and mechanical parameter matching:

Parametric Equivalent Classification: Parts that maintain identical specifications across all critical parameters including output voltage, output current, input voltage maximum, package type, operating temperature range, and RoHS compliance status.

Similar Classification: Parts that provide the same functional output voltage and current capacity within the same package family but may exhibit variations in secondary parameters such as quiescent current, PSRR performance, dropout voltage, or protection feature sets.

The following parameters determine substitution eligibility:

Output Voltage (Fixed): 3.3V
Output Current: 300mA
Package Type: SOT-23-3
Operating Temperature: -40°C ~ 85°C
RoHS Compliance: ROHS3 Compliant

Parameter Comparison

Parameter	RT9166-33GV	RT9166-33GVL	AP7333-33SAG-7
Manufacturer	Richtek USA Inc.	Richtek USA Inc.	Diodes Incorporated
Output Voltage (Fixed)	3.3V	3.3V	3.3V
Output Current	300mA	300mA	300mA
Input Voltage (Max)	5.5V	5.5V	6V
Voltage Dropout (Typ)	0.23V @ 300mA	0.23V @ 300mA	0.55V @ 300mA
Quiescent Current	300 µA	300 µA	75 µA
PSRR	55dB (1kHz)	55dB (1kHz)	65dB (100Hz)
Package Type	SOT-23-3	SOT-23-3	SOT-23-3
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Protection Features	Over Current, Over Temperature	Over Current, Over Temperature	Over Current, Over Temperature, Short Circuit
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)

Engineering Selection Recommendations

RT9166-33GVL (Parametric Equivalent): This part is a direct parametric equivalent to the RT9166-33GV, manufactured by the same supplier with identical electrical specifications. Both devices maintain ROHS3 compliance and Active product status. The primary distinction is packaging format (Cut Tape & Digi-Reel® versus standard packaging) and higher inventory availability (56,051 units). Selection of this part introduces no electrical or thermal performance trade-offs.

AP7333-33SAG-7 (Similar Substitute): This part provides equivalent output voltage and current specifications within the same SOT-23-3 package footprint and operating temperature range, with ROHS3 compliance maintained. Differences include higher maximum input voltage (6V versus 5.5V), increased dropout voltage (0.55V versus 0.23V), lower quiescent current (75 µA versus 300 µA), and enhanced protection features including short circuit protection. The MSL rating is superior (1 versus 3). Selection of this part is appropriate where lower quiescent current or enhanced input voltage margin is beneficial, with the trade-off of increased dropout voltage.

Frequently Asked Questions (FAQ)

Q: Can RT9166-33GVL be used as a direct replacement for RT9166-33GV?

A: Yes. The RT9166-33GVL is a parametric equivalent with identical electrical specifications, output voltage, output current, input voltage maximum, operating temperature range, and RoHS compliance status. The difference is packaging format and tape configuration.

Q: What are the key differences between RT9166-33GV and AP7333-33SAG-7?

A: Both devices provide 3.3V at 300mA in SOT-23-3 packages. The AP7333-33SAG-7 features higher maximum input voltage (6V), lower quiescent current (75 µA), higher PSRR (65dB), and additional short circuit protection. The RT9166-33GV has lower dropout voltage (0.23V versus 0.55V). Selection depends on whether lower quiescent current or lower dropout voltage is prioritized in the application.

Q: Are all substitute parts pin-compatible?

A: Yes. All listed parts use the SOT-23-3 package type with identical pinout configuration, enabling direct PCB footprint compatibility.

Q: Do all parts meet the same compliance requirements?

A: Yes. All parts listed are ROHS3 compliant and REACH unaffected, meeting identical regulatory requirements.

Q: Which substitute should be selected for battery-powered applications?

A: The AP7333-33SAG-7 is preferable for battery-powered applications due to its significantly lower quiescent current (75 µA versus 300 µA), reducing standby power consumption.

Q: Which substitute should be selected for applications with tight input voltage margins?

A: The RT9166-33GVL maintains identical dropout voltage (0.23V) to the main part. The AP7333-33SAG-7 has higher dropout voltage (0.55V) and should be selected only if the higher maximum input voltage (6V) is required and the increased dropout voltage is acceptable.

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