AP1115BY18L-13 Equivalent & Substitute Parts

Part Overview

The AP1115BY18L-13 is a linear voltage regulator IC manufactured by Diodes Incorporated, designed to deliver a fixed 1.8V output at 600mA in a surface-mount SOT-89-3 package. This device is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing production support and design continuity. The part operates across an input voltage range up to 18V with a maximum dropout voltage of 1.3V at full load current, incorporating over-current and over-temperature protection features.

Substiute Parts

AP1115BY18L-13

Diodes IncorporatedIn Stock: 1952AP1115BY18L-13 Datasheet

Current PartRFQ

MCP1703AT-1802E/MB

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

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AP1115BY18L-13 is determined by the following critical parameters:

• Fixed output voltage of 1.8V
• Surface-mount SOT-89-3 package compatibility
• Positive output configuration
• Maximum input voltage rating of 16V or higher
• Over-current and over-temperature protection

The MCP1703AT-1802E/MB from Microchip Technology qualifies as a direct substitute based on matching output voltage, package type, and protective features. However, the output current rating differs significantly: the substitute provides 200mA versus the original 600mA specification. This reduction in current capacity represents the primary design constraint when selecting this alternative.

Parameter Comparison

Engineering Selection Recommendations

The MCP1703AT-1802E/MB is suitable as a substitute for the AP1115BY18L-13 in applications where the 200mA output current specification meets system requirements. Both devices maintain ROHS3 compliance and unlimited moisture sensitivity ratings, ensuring regulatory and environmental compatibility.

The substitute device offers extended operating temperature range (-40°C to 125°C versus 0°C to 125°C) and superior quiescent current performance (5 µA versus 10 mA), providing advantages in low-power standby scenarios. The addition of short-circuit protection in the substitute represents an enhancement over the original design.

Applications requiring the full 600mA output current of the AP1115BY18L-13 cannot use the MCP1703AT-1802E/MB without circuit redesign or parallel configuration strategies. The reduced maximum input voltage (16V versus 18V) must be verified against system power supply specifications.

Frequently Asked Questions (FAQ)

Q: Can the MCP1703AT-1802E/MB directly replace the AP1115BY18L-13 in all applications?

A: Direct replacement is possible only in applications where load current does not exceed 200mA. The substitute device is rated for 200mA maximum output current, compared to the original 600mA specification. Circuit redesign or alternative component selection is required for higher current applications.

Q: Are the packages physically compatible?

A: Yes. Both devices use the TO-243AA package designation, which corresponds to the SOT-89-3 supplier device package. Pin-to-pin compatibility is maintained for direct PCB substitution.

Q: What are the compliance differences between these parts?

A: Both parts are ROHS3 compliant with unlimited moisture sensitivity ratings (MSL 1). Regulatory and environmental compliance requirements are equivalent.

Q: How do the protection features compare?

A: The AP1115BY18L-13 includes over-current and over-temperature protection. The MCP1703AT-1802E/MB includes these features plus short-circuit protection, providing additional safeguards in the substitute device.

Q: What is the impact of the lower quiescent current in the substitute?

A: The MCP1703AT-1802E/MB draws 5 µA quiescent current versus 10 mA in the original part. This 2000x reduction benefits battery-powered and low-power standby applications by minimizing parasitic power consumption.

Q: Does the reduced PSRR of the substitute affect performance?

A: The substitute provides 35dB PSRR at 100Hz compared to 60dB at 120Hz in the original. Applications with stringent power supply rejection requirements should evaluate noise performance specifications against system noise immunity thresholds.