AP1117K18G-13 Equivalent & Substitute Parts

Part Overview

The AP1117K18G-13 is a linear voltage regulator IC manufactured by Diodes Incorporated, designed to deliver a fixed 1.8V output at 1A maximum current. This device operates as a positive fixed output regulator in a TO-263-3 (D2PAK) surface mount package. The part is currently classified as obsolete, making identification of suitable substitute components essential for ongoing design support, production continuity, and system maintenance.

Substiute Parts

AP1117K18G-13

Diodes IncorporatedIn Stock: 1113AP1117K18G-13 Datasheet

Current PartRFQ

LD1086D2T18TR

STMicroelectronicsIn Stock: 16797LD1086D2T18TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AP1117K18G-13 is determined by strict alignment of the following critical parameters:

Output Voltage: The substitute must deliver a fixed 1.8V output to maintain circuit compatibility.

Package / Case: The substitute must use TO-263-3 (D2PAK) surface mount packaging to ensure mechanical and thermal compatibility with existing PCB layouts.

Output Current Rating: The substitute must meet or exceed the 1A output current requirement. Higher current ratings are acceptable and provide design margin.

Input Voltage Range: The substitute must accept the maximum input voltage of 18V or higher to support the same power supply configurations.

Protection Features: The substitute must include over-current and over-temperature protection to maintain system reliability.

Compliance Standards: The substitute must maintain ROHS3 compliance and MSL 1 rating for manufacturing and environmental requirements.

The LD1086D2T18TR from STMicroelectronics satisfies all substitution criteria with enhanced specifications in output current (1.5A vs. 1A), input voltage range (30V vs. 18V), and PSRR performance (82dB vs. 60dB).

Parameter Comparison

Engineering Selection Recommendations

The LD1086D2T18TR is a direct substitute for the obsolete AP1117K18G-13. Both devices maintain identical output voltage (1.8V), identical package form factor (TO-263-3 D2PAK), and equivalent protection features (over-current and over-temperature). Both are ROHS3 compliant with MSL 1 ratings.

The LD1086D2T18TR offers enhanced specifications: increased output current capability (1.5A vs. 1A), extended input voltage range (30V vs. 18V), improved PSRR performance (82dB vs. 60dB), and extended lower operating temperature limit (-40°C vs. 0°C). These enhancements provide additional design margin without introducing compatibility issues.

The LD1086D2T18TR is currently in active production status with substantial inventory availability (16,752 pcs), ensuring long-term supply continuity compared to the obsolete AP1117K18G-13.

Frequently Asked Questions (FAQ)

Q: Can the LD1086D2T18TR directly replace the AP1117K18G-13 in existing designs?

A: Yes. Both devices share identical output voltage (1.8V), identical TO-263-3 D2PAK package, and equivalent protection features. Pin-to-pin compatibility and PCB layout remain unchanged.

Q: What are the key differences between these two regulators?

A: The LD1086D2T18TR provides higher output current (1.5A vs. 1A), higher maximum input voltage (30V vs. 18V), superior PSRR (82dB vs. 60dB), and extended operating temperature range (-40°C to 125°C vs. 0°C to 125°C). The AP1117K18G-13 is obsolete; the LD1086D2T18TR is in active production.

Q: Are there any thermal or PCB layout considerations when substituting?

A: Both devices use identical TO-263-3 D2PAK packaging with the same thermal characteristics and pad layout. Existing thermal management designs require no modification.

Q: Do both parts meet the same compliance and environmental standards?

A: Yes. Both the AP1117K18G-13 and LD1086D2T18TR are ROHS3 compliant, REACH unaffected, and carry MSL 1 (unlimited) moisture sensitivity ratings.

Q: Why is the AP1117K18G-13 marked as obsolete?

A: The AP1117K18G-13 has been discontinued by Diodes Incorporated. The LD1086D2T18TR from STMicroelectronics is the recommended active alternative with superior performance specifications and guaranteed long-term availability.