AP1538SDPG-13 Equivalent & Substitute Parts

Part Overview

The AP1538SDPG-13 is a buck switching regulator IC manufactured by Diodes Incorporated, designed for positive adjustable step-down voltage regulation with a 3A output current capability. The device operates across an input voltage range of 3.6V to 18V and provides adjustable output voltage from 0.8V to 18V, making it suitable for various power management applications requiring compact surface-mount solutions.

The AP1538SDPG-13 is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production or maintenance of systems utilizing this component.

Substiute Parts

AP1538SDPG-13

Diodes IncorporatedIn Stock: 2161AP1538SDPG-13 Datasheet

Current PartRFQ

AOZ1284PI

Alpha & Omega Semiconductor Inc.In Stock: 18386AOZ1284PI Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AP1538SDPG-13 is determined by the following critical parameters:

• Topology & Function: Buck (step-down) switching regulator with positive adjustable output
• Package Compatibility: 8-SOIC (0.154", 3.90mm Width) Exposed Pad form factor
• Electrical Specifications: Input voltage range, output voltage adjustability, and output current rating
• Output Configuration: Single positive adjustable output
• Compliance & Certifications: RoHS3 compliance and surface-mount technology

The AOZ1284PI from Alpha & Omega Semiconductor Inc. qualifies as a manufacturer-recommended substitute. This device maintains functional equivalence through identical package geometry, compatible electrical operating ranges, and superior specifications in output current capacity and input voltage tolerance.

Parameter Comparison

Engineering Selection Recommendations

The AOZ1284PI is the designated manufacturer-recommended substitute for the obsolete AP1538SDPG-13. Selection of this substitute is supported by the following factors:

• Active Product Status: The AOZ1284PI is an active product with confirmed ongoing availability, eliminating supply chain discontinuity risks associated with the obsolete AP1538SDPG-13.
• Identical Package Geometry: Both devices utilize the 8-SOIC (0.154", 3.90mm Width) Exposed Pad package, enabling direct PCB layout compatibility without redesign.
• Electrical Compatibility: The AOZ1284PI operates within the input and output voltage specifications of the AP1538SDPG-13, with extended ranges providing additional design margin.
• Enhanced Performance Specifications: The AOZ1284PI provides 4A output current versus 3A, and supports wider input voltage range (3V–36V versus 3.6V–18V), offering improved flexibility for existing and future applications.
• Compliance Alignment: Both devices maintain ROHS3 compliance and equivalent regulatory certifications (REACH Unaffected, EAR99 ECCN classification).
• Extended Operating Temperature: The AOZ1284PI supports -40°C to 85°C operation, providing broader thermal range coverage compared to the -20°C to 85°C range of the AP1538SDPG-13.

Frequently Asked Questions (FAQ)

Q: Can the AOZ1284PI be used as a direct replacement for the AP1538SDPG-13 without PCB modifications?

A: Yes. Both devices share identical 8-SOIC (0.154", 3.90mm Width) Exposed Pad package geometry and pinout compatibility, allowing direct substitution on existing PCBs without layout changes.

Q: What are the key electrical differences between these devices?

A: The AOZ1284PI provides higher output current (4A versus 3A), wider input voltage range (3V–36V versus 3.6V–18V), and extended output voltage capability (0.8V–30.6V versus 0.8V–18V). These enhancements maintain backward compatibility while offering greater design flexibility.

Q: Are there any thermal or operating condition differences?

A: The AOZ1284PI supports an extended operating temperature range of -40°C to 85°C compared to the AP1538SDPG-13's -20°C to 85°C range, providing improved performance in lower-temperature environments.

Q: Do both devices meet the same compliance standards?

A: Yes. Both the AP1538SDPG-13 and AOZ1284PI are ROHS3 compliant, REACH unaffected, and classified under EAR99 ECCN, ensuring equivalent regulatory compliance.

Q: What is the switching frequency difference, and does it affect circuit design?

A: The AP1538SDPG-13 operates at a fixed 300kHz switching frequency, while the AOZ1284PI supports a programmable range of 200kHz–1MHz. Designs utilizing the fixed 300kHz frequency of the original part remain compatible with the AOZ1284PI when configured to operate at 300kHz.

Q: Is the AOZ1284PI available in the same packaging options?

A: The AOZ1284PI is supplied in Cut Tape (CT) and Digi-Reel® packaging formats. Verify packaging availability with your supplier to match your procurement requirements.