AP65503SP-13 Equivalent & Substitute Parts

Part Overview

The AP65503SP-13 is a buck switching regulator IC manufactured by Diodes Incorporated, designed for positive adjustable output applications. This device delivers 5A output current with an adjustable output voltage range of 2.5V to 12V, operating from a 4.75V to 17V input supply. The part is classified as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity. Substitute parts must maintain functional equivalence in topology, package form factor, and electrical performance within specified operating ranges.

Substiute Parts

AP65503SP-13

Diodes IncorporatedIn Stock: 25170AP65503SP-13 Datasheet

Current PartRFQ

ADP2303ARDZ-2.5-R7

Analog Devices Inc.In Stock: 2797ADP2303ARDZ-2.5-R7 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AP65503SP-13 is determined by the following critical parameters:

Topology & Function: Buck (step-down) switching regulator with positive output configuration and single output channel.

Package Compatibility: 8-SOIC (0.154", 3.90mm Width) Exposed Pad form factor for direct PCB footprint compatibility.

Electrical Performance Envelope: Input voltage range, output voltage range, and output current capacity must support the application requirements. The substitute part ADP2303ARDZ-2.5-R7 operates within compatible input voltage specifications (3V to 20V) and maintains the same package geometry.

Output Voltage Configuration: The main part features adjustable output voltage (2.5V to 12V). The substitute part provides a fixed 2.5V output, which represents a partial functional match suitable for applications requiring only the 2.5V output level.

Output Current: The main part delivers 5A; the substitute delivers 3A. This represents a reduced current capacity and is applicable only to designs with current requirements not exceeding 3A.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The AP65503SP-13 is obsolete, while the ADP2303ARDZ-2.5-R7 is in active production status. This ensures long-term availability and manufacturing support for the substitute part.

Compliance & Certifications: Both parts are ROHS3 compliant and REACH unaffected, meeting regulatory requirements for electronic component use in regulated markets.

Application Scope: The ADP2303ARDZ-2.5-R7 is suitable as a substitute only for applications meeting all of the following conditions:

• Output voltage requirement is fixed at 2.5V
• Output current requirement does not exceed 3A
• Input voltage range falls within 3V to 20V
• PCB layout accommodates the 8-SOIC exposed pad package

Limitations: The substitute part does not support adjustable output voltage or the full 5A current capacity of the original part. Designs requiring output voltage adjustment above 2.5V or sustained currents above 3A cannot use this substitute without circuit redesign.

Frequently Asked Questions (FAQ)

Q: Can the ADP2303ARDZ-2.5-R7 directly replace the AP65503SP-13 in all applications?

A: No. The substitute part is limited to applications requiring a fixed 2.5V output at currents not exceeding 3A. Applications requiring adjustable output voltage or higher current capacity require alternative solutions or circuit redesign.

Q: Are the package footprints identical?

A: Yes. Both parts use the 8-SOIC (0.154", 3.90mm Width) Exposed Pad package, enabling direct PCB footprint compatibility without layout modifications.

Q: What is the impact of the missing synchronous rectifier in the substitute part?

A: The ADP2303ARDZ-2.5-R7 lacks the integrated synchronous rectifier present in the AP65503SP-13. This may result in reduced efficiency and increased heat dissipation in the substitute part, particularly at higher load currents.

Q: Does the substitute part support the full input voltage range of the original?

A: The substitute part supports a wider input range (3V to 20V) compared to the original (4.75V to 17V). Applications operating at the original minimum input voltage of 4.75V are compatible with the substitute.

Q: What are the moisture sensitivity implications?

A: The AP65503SP-13 has MSL 1 (unlimited moisture sensitivity level), while the ADP2303ARDZ-2.5-R7 has MSL 3 (168 hours). The substitute part requires more stringent moisture control during storage and handling.

Q: Is the substitute part suitable for high-temperature applications?

A: The substitute part operates to 125°C (TJ), exceeding the original part's 85°C (TA) rating. This provides improved thermal margin for applications in elevated ambient temperature environments.