RT9164C-33GL Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The RT9164C-33GL is a linear voltage regulator IC manufactured by Richtek USA Inc., designed to provide a fixed 3.3V output at 1A current capacity in a TO-252-3 (DPAK) surface mount package. This device is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing design support and production continuity. The regulator incorporates over-current and over-temperature protection features suitable for general-purpose power management applications requiring stable 3.3V rails.

Key Parameters

Parameter	RT9164C-33GL
Manufacturer	Richtek USA Inc.
Product Status	Obsolete
Output Voltage (Fixed)	3.3V
Output Current	1A
Input Voltage (Max)	12V
Dropout Voltage (Max)	1.4V @ 1A
Quiescent Current	10 mA
PSRR	72dB (120Hz)
Package	TO-252-3 (DPAK)
Operating Temperature	-40°C ~ 85°C
Protection Features	Over Current, Over Temperature
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution of the RT9164C-33GL is determined by the following critical parameters that must remain consistent or be superior:

Fixed output voltage of 3.3V
Output current capability of 1A minimum
TO-252-3 (DPAK) package compatibility for direct PCB footprint replacement
Operating temperature range of -40°C to 85°C
Surface mount mounting type
Over-current and over-temperature protection features
RoHS3 compliance for regulatory alignment

The AP7361-33D-13 manufactured by Diodes Incorporated meets these substitution criteria while offering improved electrical characteristics in specific parameters.

Parameter Comparison

Parameter	RT9164C-33GL	AP7361-33D-13	Compatibility Notes
Manufacturer	Richtek USA Inc.	Diodes Incorporated	Different source, same functional class
Product Status	Obsolete	Active	Substitute is in active production
Output Voltage (Fixed)	3.3V	3.3V	Identical
Output Current	1A	1A	Identical
Input Voltage (Max)	12V	6V	Substitute has lower maximum input; verify source voltage does not exceed 6V
Dropout Voltage (Max)	1.4V @ 1A	0.7V @ 1A	Substitute offers superior performance (lower dropout)
Quiescent Current	10 mA	90 µA	Substitute offers significantly lower standby current
PSRR	72dB (120Hz)	65dB ~ 45dB (1kHz ~ 10kHz)	Different measurement conditions; both suitable for general applications
Package	TO-252-3 (DPAK)	TO-252-3 (DPAK)	Identical; direct footprint replacement
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	Identical
Protection Features	Over Current, Over Temperature	Over Current, Over Temperature, Short Circuit	Substitute includes additional short-circuit protection
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Both compliant
MSL Rating	3 (168 Hours)	1 (Unlimited)	Substitute has superior moisture handling

Engineering Selection Recommendations

The AP7361-33D-13 is a direct functional substitute for the obsolete RT9164C-33GL based on matching output voltage, current rating, package type, and operating temperature range. Both devices maintain RoHS3 compliance and equivalent regulatory status (EAR99, HTSUS 8542.39.0001).

The primary design consideration for substitution is the reduced maximum input voltage specification of the AP7361-33D-13 (6V versus 12V). Applications utilizing input voltages exceeding 6V require circuit redesign or alternative component selection. For applications operating within the 6V maximum input specification, the AP7361-33D-13 provides superior electrical performance through lower dropout voltage (0.7V versus 1.4V) and significantly reduced quiescent current (90 µA versus 10 mA), resulting in improved thermal efficiency and reduced power dissipation.

The AP7361-33D-13 is currently in active production with substantial inventory availability (30,400 pcs), ensuring supply chain continuity compared to the obsolete RT9164C-33GL status.

Frequently Asked Questions (FAQ)

Q: Can the AP7361-33D-13 be used as a direct replacement on existing PCBs designed for the RT9164C-33GL?

A: Yes, the AP7361-33D-13 uses the identical TO-252-3 (DPAK) package with the same pinout and footprint, enabling direct PCB replacement without layout modifications. However, verify that your circuit's input voltage does not exceed 6V, as this is the maximum specification for the AP7361-33D-13 compared to 12V for the RT9164C-33GL.

Q: What is the primary electrical difference between these two regulators?

A: The AP7361-33D-13 features a lower dropout voltage (0.7V @ 1A versus 1.4V @ 1A) and significantly lower quiescent current (90 µA versus 10 mA). These improvements reduce power dissipation and heat generation, particularly beneficial in battery-powered or thermally constrained applications.

Q: Are there any compliance or certification differences?

A: Both devices are RoHS3 compliant and carry identical regulatory classifications (EAR99, HTSUS 8542.39.0001). The AP7361-33D-13 has a superior MSL rating (1 versus 3), indicating better moisture resistance during storage and handling.

Q: What protection features does each regulator provide?

A: The RT9164C-33GL provides over-current and over-temperature protection. The AP7361-33D-13 includes these same protections plus additional short-circuit protection, offering enhanced fault tolerance.

Q: Is the AP7361-33D-13 suitable for all applications previously using the RT9164C-33GL?

A: Substitution is appropriate for applications where the input voltage remains at or below 6V. Applications requiring higher input voltage support must retain the RT9164C-33GL or select an alternative regulator with higher input voltage rating.

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