AP1115AY18G-13 Equivalent & Substitute Parts

Part Overview

The AP1115AY18G-13 is a linear voltage regulator IC from Diodes Incorporated, designed to deliver a fixed 1.8V output at 600mA in a surface-mount SOT-89-3 package. This part is classified as obsolete, making equivalent substitute components necessary for new designs and ongoing production requirements. The device provides positive fixed output regulation with integrated over-current and over-temperature protection, suitable for applications requiring stable low-voltage power delivery in compact form factors.

Substiute Parts

AP1115AY18G-13

Diodes IncorporatedIn Stock: 800AP1115AY18G-13 Datasheet

Current PartRFQ

MCP1703AT-1802E/MB

Microchip TechnologyIn Stock: 1120MCP1703AT-1802E/MB Datasheet

MFR RecommendedRFQ

RT9166A-18GX

Richtek USA Inc.In Stock: 6317RT9166A-18GX Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the AP1115AY18G-13 are selected based on the following critical parameters that define functional equivalence:

• Fixed output voltage of 1.8V
• Surface-mount SOT-89-3 package compatibility
• Positive output configuration with fixed regulation
• Over-current and over-temperature protection
• ROHS3 compliance and industrial temperature range support

Two substitute parts meet these core criteria with varying trade-offs in output current capacity and input voltage tolerance:

MCP1703AT-1802E/MB provides reduced output current (200mA vs. 600mA) but offers superior quiescent current performance and extended temperature range.

RT9166A-18GX maintains the 600mA output current specification and operates across an extended industrial temperature range, though with a more restricted input voltage maximum of 5.5V compared to the original 18V specification.

Parameter Comparison

Engineering Selection Recommendations

MCP1703AT-1802E/MB is suitable for applications where output current requirements do not exceed 200mA and where low quiescent current consumption is prioritized. This part is actively manufactured and offers extended temperature range operation (-40°C to 125°C), making it appropriate for designs requiring enhanced reliability margins. The addition of short-circuit protection provides supplementary safeguarding beyond the original part specification.

RT9166A-18GX is appropriate for applications requiring the full 600mA output current specification while maintaining active product status. This part is actively manufactured with substantial inventory availability. However, the maximum input voltage is limited to 5.5V, which restricts its use to applications with lower input voltage sources compared to the original 18V specification. Operating temperature range is limited to -40°C to 85°C (TA), which may not satisfy applications requiring the full 0°C to 125°C (TJ) range of the original part.

Both substitute parts maintain ROHS3 compliance and are available in the identical TO-243AA (SOT-89-3) package, ensuring mechanical and electrical compatibility with existing PCB layouts.

Frequently Asked Questions (FAQ)

Q: Can MCP1703AT-1802E/MB directly replace AP1115AY18G-13 in all applications?

A: MCP1703AT-1802E/MB is functionally compatible for applications requiring output currents up to 200mA. Applications requiring the full 600mA output current must use RT9166A-18GX or source the original part. Both substitute parts share the identical SOT-89-3 package and 1.8V fixed output voltage.

Q: What is the primary limitation of RT9166A-18GX as a substitute?

A: The maximum input voltage is 5.5V, compared to 18V for the original AP1115AY18G-13. This restricts its use to applications with input voltage sources not exceeding 5.5V. Applications requiring higher input voltage tolerance must use MCP1703AT-1802E/MB (up to 16V) or source the original part.

Q: Are both substitute parts available in the same package?

A: Yes. Both MCP1703AT-1802E/MB and RT9166A-18GX are available in the TO-243AA (SOT-89-3) surface-mount package, identical to the original AP1115AY18G-13. No PCB layout modifications are required for package compatibility.

Q: Which substitute part offers the lowest quiescent current?

A: MCP1703AT-1802E/MB operates at 5 µA quiescent current, significantly lower than both the original part (10 mA) and RT9166A-18GX (300 µA). This makes MCP1703AT-1802E/MB preferable for battery-powered or low-power standby applications.

Q: Do both substitute parts include the same protection features as the original?

A: Both parts include over-current and over-temperature protection. MCP1703AT-1802E/MB adds short-circuit protection, providing enhanced protection beyond the original specification. RT9166A-18GX matches the original protection feature set.

Q: What is the inventory status of these substitute parts?

A: MCP1703AT-1802E/MB has 1054 pieces in stock. RT9166A-18GX has 6300 pieces in stock. Both are actively manufactured and available for immediate procurement.