AP6503SP-13 Equivalent & Substitute Parts

Part Overview

The AP6503SP-13 is a buck switching regulator IC manufactured by Diodes Incorporated, designed for positive adjustable output applications. This device delivers 3A output current with an adjustable output voltage range from 0.925V to 20V, operating from a 4.7V to 23V input supply. The part is classified as obsolete, making identification of compatible substitute components essential for ongoing design support and procurement continuity.

Substiute Parts

AP6503SP-13

Diodes IncorporatedIn Stock: 50181AP6503SP-13 Datasheet

Current PartRFQ

LSP5523-R8A

Diodes IncorporatedIn Stock: 17181LSP5523-R8A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AP6503SP-13 is determined by the following critical parameters:

• Topology & Function: Buck switching regulator with step-down configuration
• Output Characteristics: Positive adjustable output, single output channel
• Electrical Specifications: 3A output current capability, 340kHz switching frequency, synchronous rectification
• Package Compatibility: 8-SOIC form factor with exposed pad (8-SOP-EP supplier designation)
• Voltage Operating Range: Input voltage 4.7V minimum to 23V maximum; adjustable output from 0.925V to 20V
• Environmental Compliance: ROHS3 compliance and surface mount technology

The LSP5523-R8A qualifies as a manufacturer-recommended substitute based on matching topology, output current rating, switching frequency, synchronous rectifier implementation, and identical package footprint. This part maintains functional equivalence while offering active product status and extended operating temperature range.

Parameter Comparison

Engineering Selection Recommendations

The LSP5523-R8A is the manufacturer-recommended substitute for the obsolete AP6503SP-13. Both devices share identical package footprints, enabling direct PCB-level replacement without layout modifications. The LSP5523-R8A maintains all critical electrical specifications: 3A output current, 340kHz switching frequency, synchronous rectification, and adjustable output voltage from 0.925V to 0.925V minimum.

The LSP5523-R8A offers extended input voltage range (4.5V to 27V versus 4.7V to 23V) and higher maximum output voltage (21.6V versus 20V), providing broader application flexibility. The substitute part carries active product status with ROHS3 compliance, ensuring long-term availability and regulatory alignment. Operating temperature range extends to 125°C (TJ) compared to 85°C (TA) on the original part.

Frequently Asked Questions (FAQ)

Q: Can the LSP5523-R8A replace the AP6503SP-13 in existing designs?

A: Yes. Both parts share identical 8-SOIC package geometry with exposed pad, matching pin configuration and footprint. Electrical specifications for output current (3A), switching frequency (340kHz), and adjustable output voltage range (0.925V minimum) are equivalent, enabling direct substitution.

Q: What are the key differences between these parts?

A: The LSP5523-R8A provides extended input voltage range (4.5V to 27V versus 4.7V to 23V) and higher maximum output voltage (21.6V versus 20V). Operating temperature range is higher on the substitute (125°C TJ versus 85°C TA). The LSP5523-R8A maintains active product status, whereas the AP6503SP-13 is obsolete.

Q: Are there packaging differences?

A: Both parts use 8-SOIC (0.154", 3.90mm Width) with exposed pad. The AP6503SP-13 is supplied in Cut Tape and Digi-Reel packaging, while the LSP5523-R8A is supplied in Bulk. PCB footprint and component placement remain identical.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the AP6503SP-13 and LSP5523-R8A are ROHS3 compliant and REACH unaffected, meeting equivalent regulatory requirements for industrial and commercial applications.

Q: What is the switching frequency specification?

A: Both parts operate at 340kHz switching frequency with synchronous rectification enabled, maintaining identical power conversion efficiency characteristics.