AP1115AY35G-13 Equivalent & Substitute Parts

Part Overview

The AP1115AY35G-13 is a linear voltage regulator IC from Diodes Incorporated designed for positive fixed output applications. This device delivers 600mA output current with a fixed 4.6V output and is housed in a SOT-89-3 surface mount package. The part is classified as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity.

Substiute Parts

AP1115AY35G-13

Diodes IncorporatedIn Stock: 919AP1115AY35G-13 Datasheet

Current PartRFQ

RT9166A-36GXL

Richtek USA Inc.In Stock: 1074RT9166A-36GXL Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AP1115AY35G-13 is determined by the following critical parameters:

• Package Compatibility: SOT-89-3 surface mount package (TO-243AA case)
• Output Configuration: Positive fixed output
• Output Current Rating: 600mA minimum
• Output Voltage: 4.6V to 3.6V fixed output range
• Protection Features: Over current and over temperature protection required
• Compliance: ROHS3 compliance maintained

The RT9166A-36GXL meets these substitution criteria with a 3.6V fixed output, 600mA current rating, identical SOT-89-3 packaging, and equivalent protection features. The 0.1V output voltage difference (4.6V vs 3.6V) falls within acceptable tolerance for fixed linear regulator applications in this category.

Parameter Comparison

Engineering Selection Recommendations

The RT9166A-36GXL is an active product substitute for the obsolete AP1115AY35G-13. Both devices maintain ROHS3 compliance and equivalent protection features. The RT9166A-36GXL offers improved performance characteristics including lower quiescent current (300 µA vs 10 mA) and reduced dropout voltage (0.58V typical vs 1.3V maximum), resulting in lower power dissipation in typical applications.

Design consideration: The RT9166A-36GXL has a maximum input voltage rating of 5.5V compared to the AP1115AY35G-13's 18V maximum. Applications requiring input voltages exceeding 5.5V require alternative solutions. The RT9166A-36GXL operating temperature range is -40°C to 85°C (TA) versus 0°C to 125°C (TJ) for the original part; verify compatibility with your thermal and environmental requirements.

Frequently Asked Questions (FAQ)

Q: Can the RT9166A-36GXL directly replace the AP1115AY35G-13 in all applications?

A: Direct replacement is possible for applications with input voltages up to 5.5V and operating temperatures within -40°C to 85°C. The 0.1V output voltage difference (3.6V vs 4.6V) is acceptable for most fixed regulator applications. Verify your specific circuit requirements before implementation.

Q: What is the significance of the output voltage difference between 4.6V and 3.6V?

A: For fixed linear regulators, a 0.1V difference represents approximately 2.8% variation. Most downstream circuits designed for 4.6V operation tolerate this margin. Review your load circuit specifications to confirm compatibility.

Q: Why does the RT9166A-36GXL have lower quiescent current?

A: The RT9166A-36GXL employs more efficient internal circuitry, resulting in 300 µA quiescent current versus 10 mA for the AP1115AY35G-13. This improvement reduces standby power consumption and heat generation in battery-powered or thermally constrained applications.

Q: Are there package compatibility concerns?

A: Both devices use identical SOT-89-3 packaging (TO-243AA case). Pin configuration and PCB footprint are compatible. No layout modifications are required for physical substitution.

Q: What is the impact of the lower maximum input voltage on the RT9166A-36GXL?

A: The RT9166A-36GXL accepts maximum 5.5V input versus 18V for the AP1115AY35G-13. If your application requires higher input voltages, the RT9166A-36GXL is not suitable. Identify alternative substitutes rated for your input voltage range.

Q: How do the moisture sensitivity levels affect handling and storage?

A: The AP1115AY35G-13 has MSL 1 (unlimited shelf life), while the RT9166A-36GXL has MSL 3 (168-hour floor life after moisture exposure). The RT9166A-36GXL requires standard moisture control during storage and assembly. Standard ESD and moisture handling procedures are sufficient for production environments.