AP1086D15L-U Equivalent & Substitute Parts

Part Overview

The AP1086D15L-U is a linear voltage regulator IC manufactured by Diodes Incorporated, designed for positive fixed 1.5V output at 1.5A in a TO-252-3 (DPAK) surface mount package. This device provides regulated power supply functionality with integrated over-current and over-temperature protection. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support, design updates, and production continuity.

Substiute Parts

AP1086D15L-U

Diodes IncorporatedIn Stock: 1122AP1086D15L-U Datasheet

Current PartRFQ

LD1086D2TTR

STMicroelectronicsIn Stock: 16721LD1086D2TTR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AP1086D15L-U is determined by the following critical parameters:

Output Voltage Compatibility: The AP1086D15L-U provides a fixed 1.5V output. Substitute parts must deliver the same fixed 1.5V output voltage to maintain circuit functionality without redesign.

Output Current Rating: The 1.5A output current specification is a minimum requirement. Substitute parts rated at 1.5A or higher satisfy this criterion.

Package Compatibility: The TO-252-3 (DPAK) package defines the physical footprint and pin configuration. Substitute parts must use equivalent or compatible package types to ensure PCB mounting compatibility.

Protection Features: Over-current and over-temperature protection are mandatory safety features. Substitute parts must include both protection mechanisms.

Regulatory Compliance: RoHS3 compliance and REACH unaffected status are required for modern supply chain acceptance.

The LD1086D2TTR from STMicroelectronics qualifies as a substitute based on matching output current (1.5A), identical protection features, equivalent package type (D2PAK, functionally equivalent to DPAK), and full regulatory compliance. The LD1086D2TTR offers adjustable output voltage (1.25V to 28.5V range) with fixed 1.5V configuration capability, higher input voltage tolerance (30V vs. 12V), and extended operating temperature range (-40°C to 125°C), providing enhanced performance margins.

Parameter Comparison

Engineering Selection Recommendations

The LD1086D2TTR is the qualified substitute for the obsolete AP1086D15L-U based on the following engineering criteria:

Functional Equivalence: Both devices deliver 1.5A output current with identical quiescent current (10 mA) and matching protection features (over-current and over-temperature). The LD1086D2TTR's adjustable output voltage architecture accommodates fixed 1.5V configuration through external resistor networks, maintaining functional parity.

Package Compatibility: The D2PAK package (TO-263-3) is mechanically and electrically equivalent to the DPAK package (TO-252-3), with identical lead spacing and thermal characteristics suitable for direct PCB footprint replacement.

Regulatory Compliance: Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying modern supply chain and environmental requirements.

Active Product Status: The LD1086D2TTR is classified as active, ensuring long-term availability, technical support, and supply chain continuity compared to the obsolete AP1086D15L-U.

Enhanced Performance Margins: The LD1086D2TTR provides higher input voltage tolerance (30V vs. 12V) and extended operating temperature range (-40°C to 125°C vs. 0°C to 125°C), offering improved reliability in demanding thermal or input voltage environments. The higher PSRR (88dB vs. 60dB) provides superior noise rejection.

Frequently Asked Questions (FAQ)

Q: Can the LD1086D2TTR directly replace the AP1086D15L-U without circuit modifications?

A: Yes, for applications requiring fixed 1.5V output. The LD1086D2TTR's adjustable architecture can be configured for fixed 1.5V output using standard external resistor networks. Pin configuration and package footprint are compatible. Verify external component values match the LD1086D2TTR datasheet for your specific 1.5V configuration.

Q: What is the difference between DPAK and D2PAK packages?

A: DPAK (TO-252-3) and D2PAK (TO-263-3) are functionally equivalent surface mount packages with identical lead spacing (2.54mm), pin count (3 leads), and thermal performance. Both feature a center tab for heat dissipation. They are mechanically interchangeable on standard PCB footprints.

Q: Does the LD1086D2TTR require external components for 1.5V fixed output?

A: Yes. The LD1086D2TTR is an adjustable regulator requiring external resistor dividers to set output voltage. Consult the STMicroelectronics LD1086 datasheet for the resistor network configuration to achieve 1.5V fixed output. The AP1086D15L-U is internally configured for fixed 1.5V without external components.

Q: Is the LD1086D2TTR suitable for the full operating temperature range of the AP1086D15L-U?

A: The LD1086D2TTR extends the operating range to -40°C to 125°C, which encompasses and exceeds the AP1086D15L-U range (0°C to 125°C). Applications operating at temperatures below 0°C benefit from the extended lower limit.

Q: What are the compliance and regulatory differences between these parts?

A: Both parts are ROHS3 compliant and REACH unaffected. No regulatory differences exist. Both meet modern environmental and supply chain standards.

Q: Why is the LD1086D2TTR's input voltage rating higher (30V vs. 12V)?

A: The LD1086D2TTR is a more robust design from STMicroelectronics with higher input voltage tolerance. This provides design flexibility for applications with variable input supplies. The AP1086D15L-U's 12V maximum input is sufficient for standard 12V supply applications.