AP1086D18L-U Equivalent & Substitute Parts

Part Overview

The AP1086D18L-U is a linear voltage regulator IC manufactured by Diodes Incorporated, designed to deliver a fixed 1.8V output at 1.5A in a TO-252-3 (DPAK) surface mount package. This device is classified as obsolete, making equivalent substitute parts necessary for new designs and production continuity. The regulator incorporates over-current and over-temperature protection features, operating across a 0°C to 125°C temperature range with a 60dB PSRR at 120Hz.

Substiute Parts

AP1086D18L-U

Diodes IncorporatedIn Stock: 1041AP1086D18L-U Datasheet

Current PartRFQ

LD1086DT18TR

STMicroelectronicsIn Stock: 29727LD1086DT18TR Datasheet

MFR RecommendedRFQ

LD1117ADT18TR

STMicroelectronicsIn Stock: 18206LD1117ADT18TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the AP1086D18L-U are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

• Fixed output voltage of 1.8V
• Surface mount DPAK (TO-252-3) package compatibility
• Over-current and over-temperature protection
• ROHS3 compliance and identical MSL rating (1 - Unlimited)
• Active product status for production availability

The LD1086DT18TR and LD1117ADT18TR both meet these core requirements. However, differences in maximum input voltage, output current capability, and dropout voltage specifications must be evaluated for specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

The LD1086DT18TR is the primary substitute for the AP1086D18L-U. Both devices maintain identical 1.5A output current capability and 1.8V fixed output voltage. The LD1086DT18TR offers superior specifications with a higher maximum input voltage (30V vs. 12V), improved PSRR (82dB vs. 60dB), and extended operating temperature range (-40°C to 125°C). The LD1086DT18TR is manufactured by STMicroelectronics and maintains active product status with ROHS3 compliance.

The LD1117ADT18TR serves as a secondary substitute when output current requirements are reduced to 1.0A. This device is suitable for applications where the full 1.5A capability is not required. The LD1117ADT18TR provides a lower maximum input voltage (15V) and reduced dropout voltage (1.3V @ 1A), making it appropriate for lower-voltage input systems.

Both substitute parts are available in active production status, ensuring long-term supply chain reliability and compliance with current regulatory standards.

Frequently Asked Questions (FAQ)

Q: Can the LD1086DT18TR directly replace the AP1086D18L-U in all applications?

A: Yes, for applications requiring 1.5A output current at 1.8V. The LD1086DT18TR maintains identical output current and voltage specifications. The higher maximum input voltage (30V) and improved PSRR provide enhanced performance margins. Pin configuration and package footprint are identical (TO-252-3 DPAK).

Q: What is the key difference between the LD1086DT18TR and LD1117ADT18TR?

A: The primary difference is output current capability. The LD1086DT18TR delivers 1.5A, matching the original AP1086D18L-U specification. The LD1117ADT18TR is rated for 1.0A maximum output current. Select the LD1117ADT18TR only when application requirements permit reduced current delivery.

Q: Are there temperature range considerations when substituting?

A: The LD1086DT18TR extends the operating range to -40°C to 125°C, compared to the AP1086D18L-U specification of 0°C to 125°C. This provides additional margin for low-temperature applications. The LD1117ADT18TR maintains the original 0°C to 125°C range.

Q: Do the substitute parts require PCB layout modifications?

A: No. Both substitute parts use the identical TO-252-3 (DPAK) package with the same pin configuration and footprint as the AP1086D18L-U. Existing PCB designs require no modification.

Q: Are all parts ROHS3 compliant?

A: Yes. The AP1086D18L-U, LD1086DT18TR, and LD1117ADT18TR are all ROHS3 compliant with MSL rating 1 (Unlimited), ensuring compatibility with current manufacturing and environmental standards.

Q: Which substitute should be selected for new designs?

A: The LD1086DT18TR is recommended for new designs requiring 1.5A output current. It provides active product status, superior electrical specifications, and extended operating temperature range. STMicroelectronics maintains long-term availability and supply chain stability for this device.