AP3003S-3.3TRE1 Equivalent & Substitute Parts

Part Overview

The AP3003S-3.3TRE1 is a buck switching regulator IC manufactured by Diodes Incorporated, delivering a fixed 3.3V output at 3A. This device operates across an input voltage range of 5.5V to 32V with a switching frequency of 150kHz and is housed in a TO-263-6 D2PAK package. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Substiute Parts

AP3003S-3.3TRE1

Diodes IncorporatedIn Stock: 9871AP3003S-3.3TRE1 Datasheet

Current PartRFQ

LM2575-3.3WU

Microchip TechnologyIn Stock: 25332LM2575-3.3WU Datasheet

MFR RecommendedRFQ

LM2575-3.3WU-TR

Microchip TechnologyIn Stock: 1820LM2575-3.3WU-TR Datasheet

MFR RecommendedRFQ

LM2576-3.3WU

Microchip TechnologyIn Stock: 1261LM2576-3.3WU Datasheet

MFR RecommendedRFQ

LM2576-3.3WU-TR

Microchip TechnologyIn Stock: 3580LM2576-3.3WU-TR Datasheet

MFR RecommendedRFQ

MIC4575-3.3WU

Microchip TechnologyIn Stock: 4000MIC4575-3.3WU Datasheet

MFR RecommendedRFQ

MIC4575-3.3WU-TR

Microchip TechnologyIn Stock: 707MIC4575-3.3WU-TR Datasheet

MFR RecommendedRFQ

MIC4576-3.3WU

Microchip TechnologyIn Stock: 4001MIC4576-3.3WU Datasheet

MFR RecommendedRFQ

MIC4576-3.3WU-TR

Microchip TechnologyIn Stock: 3498MIC4576-3.3WU-TR Datasheet

MFR RecommendedRFQ

SI-8033SD-TL

Sanken Electric USA Inc.In Stock: 732SI-8033SD-TL Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the AP3003S-3.3TRE1 is determined by the following critical parameters:

• Output voltage: 3.3V fixed
• Output current capability: 3A minimum
• Package type: TO-263-6 D2PAK (5 Leads + Tab)
• Input voltage range: Minimum 5.5V, maximum 32V or higher
• Topology: Buck switching regulator
• Output configuration: Positive fixed

Substitute parts are grouped into two categories based on current output capability and input voltage specifications:

Category 1: Direct Current Replacement (3A Output) Parts with 3A output current matching the original specification: LM2576-3.3WU, LM2576-3.3WU-TR, MIC4576-3.3WU, MIC4576-3.3WU-TR, and SI-8033SD-TL.

Category 2: Reduced Current Alternative (1A to 1.7A Output) Parts with lower output current but identical package and voltage specifications: LM2575-3.3WU, LM2575-3.3WU-TR, and MIC4575-3.3WU, MIC4575-3.3WU-TR. These are suitable only for applications requiring less than 3A output current.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (3A Output Current Required):

LM2576-3.3WU and LM2576-3.3WU-TR are the primary substitutes. Both are active products from Microchip Technology with ROHS3 compliance, identical package configuration, and matching 3A output current. The LM2576 series accepts a wider input voltage range (4V to 40V) compared to the original AP3003S (5.5V to 32V), providing greater design flexibility. Operating temperature extends to 125°C (junction), exceeding the original -40°C to 85°C specification.

MIC4576-3.3WU and MIC4576-3.3WU-TR offer equivalent 3A output current with higher switching frequency (200kHz) and input voltage range up to 36V. These are suitable for applications where higher switching frequency is acceptable.

SI-8033SD-TL from Sanken Electric USA Inc. provides 3A output with input voltage range of 5.5V to 28V, closely matching the original input specification. This part is active and RoHS compliant.

For Reduced Current Applications (Less Than 3A):

LM2575-3.3WU and LM2575-3.3WU-TR deliver 1A output current in the same package. These are appropriate only if application current requirements do not exceed 1A.

MIC4575-3.3WU and MIC4575-3.3WU-TR provide 1.7A switch current with buck-boost topology capability. Input voltage range is limited to 4V to 24V, which may restrict use in applications requiring the full 5.5V to 32V input range of the original part.

All substitute parts are active products with ROHS3 compliance and identical TO-263-6 D2PAK packaging, ensuring mechanical and electrical compatibility.

Frequently Asked Questions (FAQ)

Q: Can LM2575 series parts replace the AP3003S-3.3TRE1 in all applications?

A: LM2575 parts are suitable only for applications requiring 1A or less output current. The AP3003S-3.3TRE1 is rated for 3A output. If your application requires the full 3A capability, use LM2576 or MIC4576 series instead.

Q: What is the difference between tube and tape & reel packaging?

A: Tube packaging is used for manual handling and lower-volume applications. Tape & reel packaging is designed for automated pick-and-place assembly. Both contain identical components; packaging selection depends on manufacturing process requirements.

Q: Are all substitute parts pin-compatible with the AP3003S-3.3TRE1?

A: Yes. All listed substitutes use the TO-263-6 D2PAK package with 5 leads plus tab, ensuring identical pinout and mechanical fit.

Q: Does the lower switching frequency of SI-8033SD-TL affect performance?

A: The SI-8033SD-TL operates at 60kHz compared to the original 150kHz. Lower switching frequency may result in larger output filter components but does not affect voltage regulation accuracy or output current capability. Application-specific filtering requirements should be evaluated.

Q: What is the input voltage range limitation of MIC4575 parts?

A: MIC4575 series is limited to 4V to 24V input, whereas the original AP3003S-3.3TRE1 accepts 5.5V to 32V. MIC4575 is not suitable for applications requiring input voltages above 24V.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitutes are ROHS3 compliant, matching the compliance status of the original AP3003S-3.3TRE1.

Q: What is the operating temperature range difference?

A: The original part operates from -40°C to 85°C (ambient). Most Microchip substitutes extend to -40°C to 125°C (junction temperature), providing wider operating margin. SI-8033SD-TL operates from -30°C to 125°C (junction).