RT9183-18GL Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The RT9183-18GL is a linear voltage regulator IC from Richtek USA Inc. designed for positive fixed 1.8V 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 continuity. The device provides over-current and over-temperature protection suitable for low-voltage power management applications requiring fixed 1.8V regulation.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	1.8V
Output Current	1.5A
Input Voltage (Max)	5.5V
Voltage Dropout (Max)	0.5V @ 1.5A
Quiescent Current	500 µA
Package	TO-252-3 (DPAK)
Operating Temperature Range	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the RT9183-18GL is determined by the following critical parameters: fixed 1.8V output voltage, 1.5A output current capability, TO-252-3 package compatibility, positive output configuration, and surface mount mounting type. All substitute parts must maintain these core electrical and mechanical specifications to ensure direct replacement without circuit redesign.

The substitute parts are grouped into two categories:

Parametric Equivalent: RT9183-18GLF maintains identical electrical specifications and is from the same manufacturer (Richtek USA Inc.), differing only in product status (Active vs. Obsolete) and packaging format.

Similar Alternatives: AP7363-18D-13 (Diodes Incorporated) and LD29150DT18R (STMicroelectronics) provide equivalent 1.8V/1.5A regulation in the same TO-252-3 package with variations in dropout voltage, quiescent current, and maximum input voltage that remain within acceptable design margins for most applications.

Parameter Comparison

Parameter	RT9183-18GL	RT9183-18GLF	AP7363-18D-13	LD29150DT18R
Manufacturer	Richtek USA Inc.	Richtek USA Inc.	Diodes Incorporated	STMicroelectronics
Product Status	Obsolete	Active	Active	Active
Output Voltage	1.8V	1.8V	1.8V	1.8V
Output Current	1.5A	1.5A	1.5A	1.5A
Input Voltage (Max)	5.5V	5.5V	5.5V	14V
Voltage Dropout (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
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 125°C
Package	TO-252-3	TO-252-3	TO-252-3	TO-252-3
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

RT9183-18GLF is the primary substitute for RT9183-18GL. Both parts are from Richtek USA Inc. with identical electrical and thermal specifications. RT9183-18GLF holds Active product status, ensuring long-term availability and supply chain continuity. Both parts carry ROHS3 compliance and are suitable for direct replacement in existing designs.

AP7363-18D-13 (Diodes Incorporated) provides superior performance characteristics with lower dropout voltage (0.24V vs. 0.5V) and improved MSL rating (1 vs. 3). However, the maximum operating temperature is limited to 85°C compared to 125°C for the primary part. This part is suitable for applications where the 85°C upper temperature limit is acceptable and lower dropout voltage is beneficial.

LD29150DT18R (STMicroelectronics) supports higher maximum input voltage (14V vs. 5.5V) and features lower quiescent current (180 µA vs. 500 µA), making it advantageous for battery-powered or wide input voltage applications. The higher dropout voltage (0.7V) and full -40°C to 125°C operating range maintain compatibility with the original part's thermal specifications. All three substitute parts maintain ROHS3 compliance and identical output current and voltage ratings.

Frequently Asked Questions (FAQ)

Q: Can RT9183-18GLF be used as a direct replacement for RT9183-18GL?

A: Yes. RT9183-18GLF is a parametric equivalent with identical electrical specifications, output voltage, current rating, package type, and operating temperature range. The only difference is product status (Active vs. Obsolete), making it the recommended primary substitute.

Q: What are the key differences between AP7363-18D-13 and the original RT9183-18GL?

A: AP7363-18D-13 offers lower dropout voltage (0.24V vs. 0.5V) and superior moisture sensitivity rating (MSL 1 vs. MSL 3). The maximum operating temperature is reduced to 85°C. Quiescent current is higher at 1.2 mA. The part is suitable for applications where the temperature limit is acceptable and lower dropout is beneficial.

Q: Is LD29150DT18R compatible with circuits designed for RT9183-18GL?

A: Yes, with considerations. LD29150DT18R maintains the same 1.8V output, 1.5A current, and TO-252-3 package. It supports higher input voltage (14V) and lower quiescent current (180 µA). The higher dropout voltage (0.7V) may require circuit evaluation in power-limited applications. Operating temperature range matches the original part (-40°C to 125°C).

Q: Are all substitute parts in the same package?

A: Yes. All substitute parts use the TO-252-3 (DPAK) surface mount package with identical pinout and mechanical dimensions, enabling direct PCB replacement without layout modifications.

Q: Do all substitute parts meet RoHS compliance?

A: Yes. All substitute parts listed are ROHS3 compliant, maintaining environmental and regulatory compliance equivalent to the original RT9183-18GL.

Q: Which substitute should I choose for a new design?

A: RT9183-18GLF is recommended for direct compatibility and long-term supply assurance. For applications requiring lower dropout voltage, AP7363-18D-13 is suitable if the 85°C maximum temperature is acceptable. For wide input voltage or battery-powered applications, LD29150DT18R provides advantages in quiescent current and input voltage range.

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