RT9161A-28GV Equivalent & Substitute Parts

Part Overview

The RT9161A-28GV is a linear voltage regulator IC from Richtek USA Inc. designed for positive fixed output applications. This Surface Mount device delivers 500mA output current at a fixed 2.8V output voltage with a maximum dropout voltage of 1V at full load. The component is actively produced and RoHS3 compliant, making it suitable for modern electronic applications requiring regulated 2.8V power supplies in compact form factors.

Substitute parts are identified when design requirements change, inventory constraints occur, or when alternative sources provide equivalent electrical performance within the specified parameter ranges for this product category.

Substiute Parts

RT9161A-28GV

Richtek USA Inc.In Stock: 1084RT9161A-28GV Datasheet

Current PartRFQ

MCP1703AT-2802E/CB

Microchip TechnologyIn Stock: 24740MCP1703AT-2802E/CB Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RT9161A-28GV are qualified based on the following critical electrical and mechanical parameters:

Output voltage matching at 2.8V fixed output configuration ensures functional equivalence in regulated power supply applications. Package compatibility within the SOT-23-3 family (TO-236-3, SC-59) maintains mechanical interchangeability on printed circuit boards. Positive output configuration and fixed output type requirements remain constant across all qualified substitutes.

The maximum input voltage rating, output current capability, dropout voltage characteristics, and protection features (Over Current, Over Temperature) define the operational envelope. Substitutes must maintain compatibility within these parameter ranges to ensure reliable circuit operation. Surface Mount mounting type and active product status confirm current manufacturing availability and supply chain viability.

Parameter Comparison

Engineering Selection Recommendations

Both the RT9161A-28GV and MCP1703AT-2802E/CB are active products with ROHS3 compliance and REACH unaffected status, confirming regulatory alignment for current manufacturing standards. Both devices operate across the identical temperature range of -40°C to 125°C (TJ) and share the same SOT-23-3 package footprint for direct board-level substitution.

The MCP1703AT-2802E/CB provides enhanced input voltage tolerance (16V maximum versus 12V) and includes Short Circuit protection in addition to Over Current and Over Temperature functions. However, the output current rating is 250mA compared to the RT9161A-28GV's 500mA capability. Selection between these parts depends on the specific current requirements of the application circuit. Applications requiring 500mA output current must use the RT9161A-28GV. Applications with output current requirements of 250mA or less may use either device, with the MCP1703AT-2802E/CB offering higher input voltage headroom and additional protection features.

Frequently Asked Questions (FAQ)

Q: Can the MCP1703AT-2802E/CB directly replace the RT9161A-28GV on the same PCB?

A: Yes, both devices use the SOT-23-3 package (TO-236-3, SC-59) with identical pinout and footprint compatibility. Direct board-level substitution is mechanically and electrically feasible for applications where the 250mA output current rating of the MCP1703AT-2802E/CB meets circuit requirements.

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

A: The RT9161A-28GV provides 500mA output current with a 12V maximum input voltage. The MCP1703AT-2802E/CB provides 250mA output current with a 16V maximum input voltage and includes Short Circuit protection. Output current capability is the critical differentiator for substitution eligibility.

Q: Are both parts currently in production?

A: Yes, both the RT9161A-28GV and MCP1703AT-2802E/CB maintain Active product status with current manufacturing availability from their respective manufacturers.

Q: Do both regulators meet the same compliance standards?

A: Yes, both devices are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic component manufacturing and use.

Q: What protection features does each regulator include?

A: The RT9161A-28GV includes Over Current and Over Temperature protection. The MCP1703AT-2802E/CB includes Over Current, Over Temperature, and Short Circuit protection, providing enhanced fault condition coverage.

Q: Can I use the MCP1703AT-2802E/CB in an application designed for 500mA output current?

A: No. The MCP1703AT-2802E/CB is rated for maximum 250mA output current. Using it in a 500mA application would exceed its current rating and result in thermal shutdown or device damage. The RT9161A-28GV must be used for 500mA applications.