RT9183-33GL Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The RT9183-33GL is a linear voltage regulator IC from Richtek USA Inc. designed for positive fixed 3.3V output at 1.5A in a TO-252-3 (DPAK) surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The RT9183-33GL operates across an input voltage range up to 5.5V with a maximum dropout voltage of 0.5V at full load current. It includes integrated over-current and over-temperature protection features suitable for general-purpose power management applications requiring fixed 3.3V regulation.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.3V
Output Current	1.5A
Input Voltage (Max)	5.5V
Dropout Voltage (Max)	0.5V @ 1.5A
Quiescent Current	500 µA
Package	TO-252-3 (DPAK)
Operating Temperature	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the RT9183-33GL are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Fixed output voltage of 3.3V
Output current capability of 1.5A minimum
Maximum input voltage of 5.5V or greater
TO-252-3 (DPAK) surface mount package
Over-current and over-temperature protection
ROHS3 compliance

Parts are grouped into two categories: parametric equivalents (identical specifications from the same manufacturer) and similar alternatives (functionally equivalent from different manufacturers with acceptable parameter variations within design tolerances).

Parameter Comparison

Parameter	RT9183-33GL	RT9183-33GLF	AP7363-33D-13	LD29150DT33R
Manufacturer	Richtek USA Inc.	Richtek USA Inc.	Diodes Incorporated	STMicroelectronics
Output Voltage	3.3V	3.3V	3.3V	3.3V
Output Current	1.5A	1.5A	1.5A	1.5A
Input Voltage (Max)	5.5V	5.5V	5.5V	14V
Dropout Voltage (Max)	0.5V @ 1.5A	0.5V @ 1.5A	0.24V @ 1.5A	0.7V @ 1.5A
Quiescent Current	500 µA	500 µA	1.2 mA	180 µA
Package	TO-252-3	TO-252-3	TO-252-3	TO-252-3
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 125°C
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

RT9183-33GLF is the primary parametric equivalent. As an active product from the same manufacturer with identical electrical specifications and package, it provides direct substitution for the obsolete RT9183-33GL. This part maintains the same input voltage range, dropout voltage, quiescent current, and operating temperature range.

AP7363-33D-13 from Diodes Incorporated is a functionally equivalent alternative. It meets all core substitution criteria with identical output voltage, current, and package. Notable differences include lower dropout voltage (0.24V vs 0.5V) and higher quiescent current (1.2 mA vs 500 µA). The operating temperature range is limited to -40°C ~ 85°C, which may restrict use in applications requiring the full -40°C ~ 125°C range. This part is suitable for applications where the reduced temperature range is acceptable.

LD29150DT33R from STMicroelectronics is a functionally equivalent alternative with extended input voltage capability (14V maximum). It provides lower quiescent current (180 µA) and higher dropout voltage (0.7V @ 1.5A). The extended input voltage range makes this part suitable for applications with higher input supply voltages. Operating temperature range matches the original part at -40°C ~ 125°C.

All substitute parts carry ROHS3 compliance and appropriate regulatory certifications matching the original part.

Frequently Asked Questions (FAQ)

Q: Can RT9183-33GLF be used as a direct replacement for RT9183-33GL?

A: Yes. RT9183-33GLF is a parametric equivalent with identical electrical specifications, package, and operating range. The primary difference is product status (active vs. obsolete), making it the recommended direct substitute.

Q: What are the key differences between AP7363-33D-13 and the original RT9183-33GL?

A: AP7363-33D-13 has lower dropout voltage (0.24V vs. 0.5V) and higher quiescent current (1.2 mA vs. 500 µA). The operating temperature range is restricted to -40°C ~ 85°C. These differences are acceptable for most applications but should be verified against specific design requirements.

Q: When should LD29150DT33R be selected over other substitutes?

A: LD29150DT33R is preferred when the input supply voltage exceeds 5.5V, as it supports up to 14V input. It also offers lower quiescent current (180 µA), beneficial for battery-powered or low-power applications. The higher dropout voltage (0.7V) should be considered in power budget calculations.

Q: Are all substitute parts in the same package?

A: Yes. All substitute parts use the TO-252-3 (DPAK) surface mount package, ensuring mechanical and thermal compatibility with the original RT9183-33GL footprint.

Q: Do all substitute parts meet the same compliance standards?

A: Yes. All substitute parts are ROHS3 compliant and carry REACH Unaffected status, matching the original part's regulatory compliance profile.

Q: What is the impact of quiescent current differences on system design?

A: Quiescent current affects standby power consumption. RT9183-33GLF and RT9183-33GL both draw 500 µA. LD29150DT33R draws only 180 µA (lower), while AP7363-33D-13 draws 1.2 mA (higher). For battery-powered applications, lower quiescent current extends runtime.

Q: Can these parts be used interchangeably on the same PCB?

A: Yes, provided the design accommodates the electrical parameter variations. Verify that input voltage, output current requirements, operating temperature range, and dropout voltage specifications align with your application before substitution.

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