AP1084D18L-13 Equivalent & Substitute Parts

Part Overview

The AP1084D18L-13 is a linear voltage regulator IC from Diodes Incorporated designed for positive fixed 1.8V output at 5A in a TO-252-3 (DPAK) surface mount package. This part is currently discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and procurement. The regulator provides over-current and over-temperature protection suitable for power management applications requiring stable 1.8V rails.

Substiute Parts

AP1084D18L-13

Diodes IncorporatedIn Stock: 100407AP1084D18L-13 Datasheet

Current PartRFQ

AP1084D18G-13

Diodes IncorporatedIn Stock: 77006AP1084D18G-13 Datasheet

Parametric EquivalentRFQ

AP1084D18L-13

Diodes IncorporatedIn Stock: 100407AP1084D18L-13 Datasheet

Parametric EquivalentRFQ

LD1117ADT18TR

STMicroelectronicsIn Stock: 18206LD1117ADT18TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the AP1084D18L-13 are classified based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

• Output voltage: 1.8V fixed
• Package type: TO-252-3 (DPAK)
• Output configuration: Positive
• Protection features: Over Current and Over Temperature
• RoHS3 compliance
• Operating temperature range: 0°C ~ 125°C

Secondary Consideration:

• Current output capacity (5A for main part; lower ratings acceptable for reduced-load applications)
• Maximum input voltage (12V minimum requirement)
• Quiescent current (10 mA baseline)

The AP1084D18G-13 is a parametric equivalent from the same manufacturer with identical electrical specifications but different moisture sensitivity rating. The LD1117ADT18TR from STMicroelectronics is a manufacturer-recommended substitute with the same package and output voltage but reduced current output (1A vs 5A), suitable for applications not requiring full 5A capacity.

Parameter Comparison

Engineering Selection Recommendations

AP1084D18G-13 (Diodes Incorporated): Direct parametric equivalent with identical electrical specifications. Preferred for applications requiring the full 5A output capacity. Superior moisture sensitivity rating (MSL 1 vs MSL 3) provides better shelf-life and handling characteristics. Product status is obsolete but inventory availability is documented at 76,988 units.

LD1117ADT18TR (STMicroelectronics): Manufacturer-recommended substitute with active product status, ensuring long-term availability and supply chain stability. Suitable for applications with output current requirements of 1A or less. Higher maximum input voltage (15V vs 12V) provides additional design margin. MSL 1 rating supports extended storage and handling. Inventory availability is documented at 18,188 units.

Selection between AP1084D18G-13 and LD1117ADT18TR depends on current output requirements: use AP1084D18G-13 for 5A applications, use LD1117ADT18TR for 1A or lower applications. All three parts maintain identical package footprint (TO-252-3 DPAK), output voltage (1.8V), and protection features, enabling direct PCB substitution within current rating constraints.

Frequently Asked Questions (FAQ)

Q: Can LD1117ADT18TR replace AP1084D18L-13 in all applications?

A: LD1117ADT18TR is suitable only for applications requiring 1A or less output current. The AP1084D18L-13 is rated for 5A output. If your circuit draws more than 1A from the 1.8V rail, LD1117ADT18TR will not provide adequate current capacity and may trigger over-current protection.

Q: What is the difference between AP1084D18L-13 and AP1084D18G-13?

A: Both parts are parametric equivalents with identical electrical specifications (5A output, 1.8V fixed, 1.4V dropout @ 5A). The primary difference is moisture sensitivity level: AP1084D18L-13 has MSL 3 (168 hours), while AP1084D18G-13 has MSL 1 (unlimited). AP1084D18G-13 offers superior shelf-life and handling characteristics.

Q: Are all three parts in the same package?

A: Yes. All three parts use TO-252-3 (DPAK with 2 leads plus tab, SC-63 designation). PCB footprints are identical, enabling direct physical substitution.

Q: Which substitute has the best long-term availability?

A: LD1117ADT18TR from STMicroelectronics has active product status, indicating ongoing manufacture and distribution. AP1084D18G-13 is obsolete, and AP1084D18L-13 is discontinued at DiGi Electronics. For new designs requiring long-term supply assurance, LD1117ADT18TR is the preferred choice if current requirements permit 1A operation.

Q: Do all parts meet RoHS3 compliance?

A: Yes. AP1084D18L-13, AP1084D18G-13, and LD1117ADT18TR are all ROHS3 compliant and REACH unaffected, meeting environmental and regulatory requirements for industrial and commercial applications.

Q: What is the maximum input voltage for each part?

A: AP1084D18L-13 and AP1084D18G-13 support maximum input voltage of 12V. LD1117ADT18TR supports 15V maximum input, providing 3V additional design margin for input supply variations.