AP1186K5-15L-U Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The AP1186K5-15L-U is a linear voltage regulator IC manufactured by Diodes Incorporated, designed to deliver a fixed 1.5V output at 1.5A in a TO-263-5 surface mount package. This device functions as a positive fixed output regulator with integrated over-current and over-temperature protection. The part is currently classified as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity.

Substiute Parts

AP1186K5-15L-U

Diodes IncorporatedIn Stock: 1923AP1186K5-15L-U Datasheet

Current PartRFQ

LT1963EQ-1.5#PBF

Analog Devices Inc.In Stock: 2241LT1963EQ-1.5#PBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AP1186K5-15L-U is determined by the following critical parameters:

• Fixed output voltage of 1.5V
• Output current capability of 1.5A minimum
• Surface mount packaging compatible with TO-263 footprint
• Maximum input voltage rating of 16V or higher
• Protection against over-current and over-temperature conditions
• RoHS3 compliance for regulatory alignment

The LT1963EQ-1.5#PBF meets these substitution criteria. Both devices share identical output voltage and current specifications, compatible package geometry (DDPAK-5/TO-263-6), and equivalent protection features. The substitute part maintains functional and electrical compatibility while offering an active product status.

Parameter Comparison

Engineering Selection Recommendations

The LT1963EQ-1.5#PBF is the qualified substitute for the AP1186K5-15L-U based on the following engineering criteria:

• Both devices deliver identical 1.5V fixed output at 1.5A, meeting core functional requirements
• Package footprints are mechanically compatible (TO-263-5 and DDPAK-5 share the same land pattern)
• The substitute part maintains active product status, ensuring long-term availability and supply chain continuity
• Both components carry ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements
• The LT1963EQ-1.5#PBF provides enhanced input voltage rating (20V vs. 16V) and additional reverse polarity protection, offering improved design margin
• Quiescent current is significantly lower in the substitute (1.5 mA vs. 10 mA), reducing standby power consumption

Frequently Asked Questions (FAQ)

Q: Can the LT1963EQ-1.5#PBF directly replace the AP1186K5-15L-U without PCB modifications?

A: Yes. Both devices use compatible TO-263 package geometry (DDPAK-5 footprint). Pin configuration and functional pinout are equivalent, allowing direct substitution on existing PCB layouts without design changes.

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

A: The primary differences are: (1) Input voltage rating—LT1963EQ-1.5#PBF supports 20V maximum versus 16V for the AP1186K5-15L-U; (2) Quiescent current—LT1963EQ-1.5#PBF draws 1.5 mA versus 10 mA; (3) Dropout voltage—AP1186K5-15L-U has lower dropout at 0.38V versus 0.55V; (4) Operating temperature range—AP1186K5-15L-U extends to 150°C versus 125°C maximum for the substitute; (5) Additional reverse polarity protection in the LT1963EQ-1.5#PBF.

Q: Is the LT1963EQ-1.5#PBF suitable for applications requiring the full 0°C to 150°C temperature range?

A: The LT1963EQ-1.5#PBF operates from -40°C to 125°C. Applications requiring operation above 125°C cannot use this substitute. Verify your application's maximum operating temperature requirement before selection.

Q: Are there any compliance or certification concerns with substitution?

A: Both parts are ROHS3 compliant and REACH unaffected. No compliance barriers exist for substitution in regulated applications. Verify component certifications against your specific application requirements.

Q: What is the impact of the higher dropout voltage in the LT1963EQ-1.5#PBF?

A: The LT1963EQ-1.5#PBF requires 0.55V dropout versus 0.38V for the original part. This means the minimum input voltage must be 0.17V higher to maintain regulation at full 1.5A output. Verify your input voltage headroom supports this requirement.