RT9183-18GG Linear Voltage Regulator IC Equivalent & Substitute Parts

Part Overview

The RT9183-18GG is a linear voltage regulator IC manufactured by Richtek USA Inc., designed to deliver a fixed 1.8V output at 1.5A in a SOT-223 surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The regulator features integrated over-current and over-temperature protection, operating across the industrial temperature range of -40°C to 125°C.

Key Parameters

Parameter	Value
Manufacturer	Richtek USA Inc.
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Fixed
Voltage - Output (Fixed)	1.8V
Voltage - Input (Max)	5.5V
Current - Output	1.5A
Voltage Dropout (Max)	0.5V @ 1.5A
Current - Quiescent (Iq)	500 µA
Protection Features	Over Current, Over Temperature
Operating Temperature	-40°C to 125°C
Package / Case	TO-261-4, TO-261AA (SOT-223)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the RT9183-18GG is determined by the following critical parameters: fixed 1.8V output voltage, 1.5A output current capability, positive output configuration, SOT-223 package compatibility, and operating temperature range of -40°C to 125°C. Substitute parts are grouped into two categories:

Parametric Equivalent: Parts that maintain identical electrical specifications and package form factor, differing only in product status or packaging variant.

Similar Substitute: Parts that meet the core functional requirements (1.8V fixed output, surface mount SOT-223 package, industrial temperature range) but may have variations in maximum input voltage, dropout voltage, quiescent current, or output current capacity within acceptable design margins.

Parameter Comparison

Parameter	RT9183-18GG	RT9183-18GGF	LT1963EST-1.8#PBF	TLV117118DCYR	TLV117118DCYT
Manufacturer	Richtek USA Inc.	Richtek USA Inc.	Analog Devices Inc.	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active	Active	Active
Output Voltage (Fixed)	1.8V	1.8V	1.8V	1.8V	1.8V
Voltage - Input (Max)	5.5V	5.5V	20V	5.5V	5.5V
Current - Output	1.5A	1.5A	1.5A	1A	1A
Voltage Dropout (Max)	0.5V @ 1.5A	0.5V @ 1.5A	0.55V @ 1.5A	0.8V @ 1A	0.8V @ 1A
Current - Quiescent (Iq)	500 µA	500 µA	1.5 mA	100 µA	100 µA
Package / Case	TO-261-4, TO-261AA (SOT-223)	TO-261-4, TO-261AA (SOT-223F)	TO-261-4, TO-261AA (SOT-223-3)	TO-261-4, TO-261AA (SOT-223-4)	TO-261-4, TO-261AA (SOT-223-4)
Operating Temperature	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C
Protection Features	Over Current, Over Temperature	Over Current, Over Temperature	Over Current, Over Temperature, Reverse Polarity	Over Current, Over Temperature, Reverse Polarity, UVLO	Over Current, Over Temperature, Reverse Polarity, UVLO
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

RT9183-18GGF is the primary parametric equivalent for the obsolete RT9183-18GG. This part maintains identical electrical specifications, output current rating, and package footprint while offering active product status and improved availability. The only distinction is the SOT-223F packaging variant, which is functionally equivalent for PCB layout purposes.

LT1963EST-1.8#PBF (Analog Devices Inc.) serves as a direct functional substitute with identical 1.8V fixed output and 1.5A current capacity. This part accepts higher maximum input voltage (20V versus 5.5V), providing greater design flexibility for applications with variable input sources. The higher quiescent current (1.5 mA versus 500 µA) may impact battery-powered designs. MSL rating of 1 (Unlimited) offers superior moisture handling compared to the original part's MSL 3 rating.

TLV117118DCYR and TLV117118DCYT (Texas Instruments) are similar substitutes with reduced output current capacity (1A versus 1.5A). These parts are suitable for applications where the full 1.5A output is not required. Both variants feature lower quiescent current (100 µA), enhanced protection features including reverse polarity and under-voltage lockout, and MSL 1 rating. The primary distinction between these two is packaging format: DCYR is supplied in Tape & Reel, while DCYT is supplied in Cut Tape with Digi-Reel option.

All substitute parts maintain ROHS3 compliance and industrial temperature range operation, ensuring regulatory and thermal compatibility with the original design.

Frequently Asked Questions (FAQ)

Q: Can RT9183-18GGF be used as a direct replacement for RT9183-18GG?

A: Yes. RT9183-18GGF is a parametric equivalent with identical electrical specifications and package footprint. The SOT-223F designation indicates a packaging variant that is functionally interchangeable for PCB assembly purposes.

Q: What is the key difference between LT1963EST-1.8#PBF and the original RT9183-18GG?

A: The LT1963EST-1.8#PBF accepts input voltages up to 20V compared to 5.5V maximum for the RT9183-18GG, making it suitable for higher voltage input applications. Quiescent current is higher at 1.5 mA. Both deliver 1.8V at 1.5A output.

Q: Why do TLV117118DCYR and TLV117118DCYT have lower output current ratings?

A: These Texas Instruments parts are rated for 1A maximum output current versus 1.5A for the original part. They are suitable substitutes only for applications requiring 1A or less. Both offer superior protection features and lower quiescent current consumption.

Q: Are all substitute parts available in the same SOT-223 package?

A: All substitute parts use SOT-223 package variants (SOT-223F, SOT-223-3, SOT-223-4) with identical TO-261-4 and TO-261AA case dimensions. PCB footprints are compatible across all variants.

Q: What is the impact of MSL rating differences on component handling?

A: The original RT9183-18GG has MSL 3 rating (168 hours maximum floor life). Substitute parts with MSL 1 rating (LT1963EST-1.8#PBF, TLV117118DCYR, TLV117118DCYT) have unlimited floor life, reducing moisture-related reflow failures and simplifying inventory management.

Q: Can TLV117118DCYT and TLV117118DCYR be used interchangeably?

A: Electrically, yes. Both are identical TLV117118 devices with 1.8V fixed output and 1A current rating. The difference is packaging format: DCYT is supplied in Cut Tape with Digi-Reel option, while DCYR is supplied in Tape & Reel. Selection depends on assembly line requirements.

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