AP1115AY33G-13 Equivalent & Substitute Parts

Part Overview

The AP1115AY33G-13 is a linear voltage regulator IC from Diodes Incorporated, designed to deliver a fixed 3.3V output at 600mA in a surface-mount SOT-89-3 package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The device is suitable for applications requiring positive fixed voltage regulation with integrated over-current and over-temperature protection.

Substiute Parts

AP1115AY33G-13

Diodes IncorporatedIn Stock: 37551AP1115AY33G-13 Datasheet

Current PartRFQ

MCP1703AT-3302E/MB

Microchip TechnologyIn Stock: 1977MCP1703AT-3302E/MB Datasheet

MFR RecommendedRFQ

RT9166A-33GX

Richtek USA Inc.In Stock: 27217RT9166A-33GX Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the AP1115AY33G-13 is determined by the following critical parameters:

• Fixed output voltage of 3.3V
• Surface-mount SOT-89-3 package compatibility
• Positive output configuration with fixed regulation
• Over-current and over-temperature protection
• ROHS3 compliance

Two substitute parts meet these core criteria with variations in output current capacity and electrical characteristics:

1. RT9166A-33GX — Maintains 600mA output current matching the original part
2. MCP1703AT-3302E/MB — Reduced output current of 250mA, suitable for lower-power applications

Parameter Comparison

Engineering Selection Recommendations

RT9166A-33GX is the primary substitute for direct replacement in applications requiring 600mA output current. Both parts share identical output current capacity and package form factor. The RT9166A-33GX is an active product with current manufacturing support. However, the maximum input voltage is limited to 5.5V compared to the original part's 18V specification, which may restrict use in higher input voltage applications.

MCP1703AT-3302E/MB is suitable for applications where output current requirements do not exceed 250mA. This part offers superior quiescent current performance (5 µA versus 10 mA) and includes short-circuit protection. The extended operating temperature range (-40°C ~ 125°C) provides broader environmental compatibility. This substitute is recommended for power-sensitive or battery-powered designs operating within the 250mA current limit.

Both substitutes are ROHS3 compliant and actively manufactured, ensuring long-term availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can RT9166A-33GX replace AP1115AY33G-13 in all applications?

A: RT9166A-33GX is a direct functional substitute for applications with input voltages up to 5.5V. If your design requires input voltages exceeding 5.5V, this substitute is not suitable. Verify your input voltage specification before selection.

Q: When should MCP1703AT-3302E/MB be used instead of RT9166A-33GX?

A: MCP1703AT-3302E/MB is appropriate when output current requirements are 250mA or less. This part offers lower quiescent current (5 µA) and is preferred for battery-powered or low-power applications. It also supports input voltages up to 16V, making it suitable for higher input voltage designs within the 250mA current constraint.

Q: Are all three parts pin-compatible?

A: All three parts use the SOT-89-3 package (TO-243AA), ensuring mechanical and electrical pin compatibility. PCB layout modifications are not required for substitution.

Q: What is the impact of different quiescent current values?

A: Quiescent current affects standby power consumption. The AP1115AY33G-13 draws 10 mA, RT9166A-33GX draws 300 µA, and MCP1703AT-3302E/MB draws 5 µA. In applications with continuous operation or minimal load, lower quiescent current reduces overall power dissipation.

Q: Do all substitutes provide the same protection features?

A: AP1115AY33G-13 and RT9166A-33GX provide over-current and over-temperature protection. MCP1703AT-3302E/MB adds short-circuit protection, offering enhanced fault tolerance.

Q: What is the significance of product status (Obsolete vs. Active)?

A: Active products have ongoing manufacturing support and guaranteed long-term availability. The original AP1115AY33G-13 is obsolete, meaning production has ended. Both substitutes are active products with current supply chain support.