AP1086KL-U Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The AP1086KL-U is a linear voltage regulator IC from Diodes Incorporated designed for positive adjustable output applications. It delivers 1.5A output current in a TO-263 surface mount package. The device is classified as obsolete, making identification of active equivalent parts essential for ongoing design support and procurement continuity. This reference provides engineering-validated substitute options based on electrical and mechanical compatibility parameters.

Substiute Parts

AP1086KL-U

Diodes IncorporatedIn Stock: 1123AP1086KL-U Datasheet

Current PartRFQ

LD1086D2MTR

STMicroelectronicsIn Stock: 2558LD1086D2MTR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AP1086KL-U is determined by the following critical parameters:

Output configuration and type must remain positive and adjustable. The output current rating of 1.5A establishes the minimum current delivery requirement. Input voltage rating, output voltage range (1.25V minimum to 5V maximum), and dropout voltage characteristics define the operational envelope. Package compatibility requires surface mount D2PAK configuration. Protection features (over current and over temperature) and quiescent current specifications must be maintained or exceeded. Compliance certifications (ROHS3, REACH Unaffected, EAR99) ensure regulatory alignment.

The LD1086D2MTR from STMicroelectronics qualifies as a direct substitute based on matching these core parameters within the allowed electrical and mechanical specifications for this product category.

Parameter Comparison

Engineering Selection Recommendations

The LD1086D2MTR is the manufacturer-recommended substitute for the AP1086KL-U. Both devices maintain ROHS3 compliance and REACH Unaffected status, ensuring regulatory continuity. The LD1086D2MTR is actively manufactured by STMicroelectronics, providing long-term availability and supply chain stability compared to the obsolete AP1086KL-U.

The LD1086D2MTR demonstrates enhanced electrical performance across multiple parameters: maximum input voltage of 30V versus 12V, extended output voltage range to 28.5V, improved PSRR of 88dB, and expanded operating temperature range of -40°C to 125°C. These enhancements provide design margin without compromising the core 1.5A output current specification or adjustable output configuration required for the original application.

Package compatibility is maintained within the D2PAK family, though the LD1086D2MTR uses TO-263-4 (3 Leads + Tab) versus the AP1086KL-U TO-263-3 (2 Leads + Tab). Both are surface mount D2PAK configurations suitable for PCB integration.

Frequently Asked Questions (FAQ)

Q: Can the LD1086D2MTR directly replace the AP1086KL-U on existing PCBs?

A: The LD1086D2MTR is electrically compatible and functionally equivalent. Both devices are D2PAK surface mount packages with identical output current (1.5A), adjustable output configuration, and protection features. PCB layout compatibility depends on specific pad configuration; verify pinout alignment with your board design.

Q: What is the difference between TO-263-3 and TO-263-4 packages?

A: TO-263-3 contains 2 leads plus a tab; TO-263-4 contains 3 leads plus a tab. Both are D2PAK variants in the TO-263 family. The additional lead in the TO-263-4 does not prevent substitution if your PCB design accommodates or ignores the extra connection point.

Q: Why does the LD1086D2MTR have a higher maximum input voltage (30V vs 12V)?

A: The LD1086D2MTR is designed for broader application flexibility. In designs limited to 12V input, this higher rating provides additional design margin and does not negatively impact performance at lower input voltages.

Q: Are the quiescent current specifications identical?

A: Yes, both the AP1086KL-U and LD1086D2MTR specify 10 mA quiescent current, ensuring equivalent standby power consumption characteristics.

Q: Does the LD1086D2MTR meet the same compliance requirements?

A: Yes, the LD1086D2MTR is ROHS3 compliant and REACH Unaffected, matching the regulatory status of the AP1086KL-U.

Q: What is the significance of the improved PSRR in the LD1086D2MTR?

A: The LD1086D2MTR provides 88dB PSRR versus 60dB in the AP1086KL-U. Higher PSRR indicates superior rejection of input voltage ripple and noise, resulting in cleaner regulated output. This enhancement is beneficial for noise-sensitive applications.

Q: Is the LD1086D2MTR suitable for the full 0°C to 125°C operating range of the original part?

A: Yes, the LD1086D2MTR operates across -40°C to 125°C, which encompasses and exceeds the AP1086KL-U range of 0°C to 125°C.