RT9161-33GV Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The RT9161-33GV is an active linear voltage regulator IC manufactured by Richtek USA Inc., designed for positive fixed 3.3V output applications with 300mA current capacity in a surface mount SOT-23-3 package. This part is actively produced and widely stocked, with 18,707 units available in inventory. Linear voltage regulators in this category are essential components for stable power supply in embedded systems, IoT devices, and low-power applications requiring regulated 3.3V rails. Substitute parts are identified based on matching electrical specifications, package compatibility, and regulatory compliance.

Key Parameters

Parameter	RT9161-33GV
Manufacturer	Richtek USA Inc.
Output Voltage (Fixed)	3.3V
Output Current	300mA
Input Voltage (Max)	12V
Voltage Dropout (Max)	0.6V @ 300mA
Package / Case	SOT-23-3 (TO-236-3, SC-59)
Operating Temperature	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)

Substitute Part Grouping Explanation

Substitute parts for the RT9161-33GV are qualified based on the following critical parameters:

Fixed output voltage of 3.3V
Output current capacity of 300mA or greater
Surface mount SOT-23-3 package compatibility
Input voltage rating of 12V or higher
Operating temperature range of -40°C to 125°C
Active product status with current manufacturing
ROHS3 compliance and REACH unaffected status

The three identified substitute parts meet these criteria with minor variations in dropout voltage, quiescent current, and additional protection features that do not compromise functional equivalence in standard 3.3V regulated power supply applications.

Parameter Comparison

Parameter	RT9161-33GV	AP2210N-3.3TRE1	AP2210N-3.3TRG1	MCP1703AT-3302E/CB
Manufacturer	Richtek USA Inc.	Diodes Incorporated	Diodes Incorporated	Microchip Technology
Output Voltage (Fixed)	3.3V	3.3V	3.3V	3.3V
Output Current	300mA	300mA	300mA	250mA
Input Voltage (Max)	12V	13.2V	13.2V	16V
Voltage Dropout (Max)	0.6V @ 300mA	0.5V @ 300mA	0.5V @ 300mA	0.725V @ 250mA
Package / Case	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature	Over Current, Over Temperature, Reverse Polarity	Over Current, Over Temperature, Reverse Polarity	Over Current, Over Temperature, Short Circuit
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)
Product Status	Active	Active	Active	Active

Engineering Selection Recommendations

All four parts are actively manufactured and ROHS3 compliant with REACH unaffected status, meeting regulatory requirements for industrial and commercial applications.

AP2210N-3.3TRE1 and AP2210N-3.3TRG1 (Diodes Incorporated) provide improved dropout voltage performance at 0.5V compared to the RT9161-33GV at 0.6V, with identical 300mA output current and higher maximum input voltage rating of 13.2V. These parts include reverse polarity protection as an additional feature. The primary difference between these two variants is packaging: AP2210N-3.3TRE1 is supplied in Tape & Reel format, while AP2210N-3.3TRG1 is supplied in Cut Tape & Digi-Reel format.

MCP1703AT-3302E/CB (Microchip Technology) offers the highest maximum input voltage rating at 16V and superior moisture sensitivity level of 1 (unlimited), indicating lower moisture absorption risk. However, this part has a reduced output current rating of 250mA and higher dropout voltage of 0.725V at rated current. The MCP1703AT-3302E/CB is suitable for applications where the 250mA output current is sufficient and where extended moisture tolerance is required.

Frequently Asked Questions (FAQ)

Q: Can AP2210N-3.3TRE1 and AP2210N-3.3TRG1 be used interchangeably with RT9161-33GV?

A: Yes. Both parts provide identical electrical specifications for 3.3V fixed output at 300mA with SOT-23-3 package compatibility. The difference between TRE1 and TRG1 variants is packaging format only (Tape & Reel versus Cut Tape & Digi-Reel), not electrical performance.

Q: Is MCP1703AT-3302E/CB a direct substitute for RT9161-33GV?

A: MCP1703AT-3302E/CB is functionally equivalent for 3.3V regulation in SOT-23-3 package but has reduced output current capacity (250mA versus 300mA). Use this part only in applications where 250mA output current is sufficient. The higher input voltage rating (16V) and superior moisture sensitivity level (1 versus 3) may be advantageous in specific environmental conditions.

Q: What is the significance of dropout voltage differences?

A: Dropout voltage determines the minimum input-to-output voltage differential required for proper regulation. Lower dropout voltage allows operation with lower input voltages or provides better efficiency. AP2210N variants at 0.5V dropout offer improved performance compared to RT9161-33GV at 0.6V. MCP1703AT at 0.725V requires higher input voltage margin.

Q: Are all substitute parts available in the same packaging format?

A: All parts use SOT-23-3 package for pinout and footprint compatibility. However, supply format differs: RT9161-33GV and AP2210N-3.3TRE1 are supplied in Tape & Reel; AP2210N-3.3TRG1 is supplied in Cut Tape & Digi-Reel; MCP1703AT-3302E/CB is supplied in Cut Tape & Digi-Reel. Verify supply format requirements for your procurement process.

Q: What additional protection features do substitute parts provide?

A: AP2210N variants include reverse polarity protection in addition to over current and over temperature protection. MCP1703AT includes short circuit protection. RT9161-33GV includes only over current and over temperature protection. Additional protection features do not affect basic functional equivalence but may provide enhanced reliability in specific applications.

Q: Which substitute part has the best moisture tolerance?

A: MCP1703AT-3302E/CB has Moisture Sensitivity Level 1 (unlimited), compared to Level 3 (168 hours) for all other parts. This indicates superior moisture absorption resistance and is relevant for applications in high-humidity environments or extended storage conditions.

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