AP3503MPTR-G1 Equivalent & Substitute Parts

Part Overview

The AP3503MPTR-G1 is a buck switching regulator IC manufactured by Diodes Incorporated, designed for positive adjustable output voltage regulation with 3A output current capability. This component operates as a step-down converter with a single adjustable output, suitable for applications requiring input voltage ranges from 4.5V to 18V and output voltage adjustment from 0.925V to 16.2V.

The AP3503MPTR-G1 is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production requirements for systems utilizing this regulator topology.

Substiute Parts

AP3503MPTR-G1

Diodes IncorporatedIn Stock: 20330AP3503MPTR-G1 Datasheet

Current PartRFQ

RT8250GSP

Richtek USA Inc.In Stock: 24592RT8250GSP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the AP3503MPTR-G1 are qualified based on the following critical parameters that determine functional equivalence:

• Topology & Function: Buck switching regulator with step-down operation
• Output Configuration: Positive adjustable voltage regulation
• Output Current Rating: 3A minimum
• Switching Frequency: 340kHz operation
• Synchronous Rectifier: Integrated synchronous rectification capability
• Package Type: 8-SOIC with exposed pad, surface mount
• Operating Temperature Range: -40°C to 85°C
• Input Voltage Compatibility: Minimum 4.5V input support
• Output Voltage Adjustability: Minimum 0.925V to maximum output voltage capability
• Compliance Standards: ROHS3 compliance and MSL rating compatibility

The RT8250GSP from Richtek USA Inc. meets all these substitution criteria and qualifies as a direct equivalent for the obsolete AP3503MPTR-G1.

Parameter Comparison

Engineering Selection Recommendations

The RT8250GSP is a qualified substitute for the obsolete AP3503MPTR-G1 based on the following engineering criteria:

Compliance & Certification Alignment: Both parts maintain ROHS3 compliance and identical MSL ratings (3, 168 Hours), ensuring compatibility with manufacturing processes and supply chain requirements.

Product Status Advantage: The RT8250GSP carries active product status from Richtek USA Inc., providing assured long-term availability and supply continuity compared to the obsolete AP3503MPTR-G1.

Electrical Parameter Compatibility: The RT8250GSP demonstrates enhanced input voltage tolerance (23V maximum versus 18V) and higher maximum output voltage capability (20V versus 16.2V), providing expanded operational headroom while maintaining identical minimum specifications for input (4.5V) and output (0.925V) voltages.

Functional Equivalence: Identical output current (3A), switching frequency (340kHz), synchronous rectifier implementation, and operating temperature range (-40°C to 85°C) ensure drop-in compatibility at the functional level.

Package Compatibility: Both parts utilize the same 8-SOIC package with exposed pad and surface mount configuration, enabling direct PCB layout compatibility without redesign.

Frequently Asked Questions (FAQ)

Q: Can the RT8250GSP directly replace the AP3503MPTR-G1 on existing PCBs?

A: Yes. Both parts share identical package specifications (8-SOIC with exposed pad, 0.154" width, 3.90mm), surface mount configuration, and pinout compatibility. No PCB layout modifications are required.

Q: What are the key differences between these parts?

A: The primary differences are manufacturer (Diodes Incorporated versus Richtek USA Inc.) and product status (obsolete versus active). The RT8250GSP offers extended input voltage range (23V maximum versus 18V) and higher maximum output voltage (20V versus 16.2V). All other electrical and thermal specifications are identical.

Q: Are there any compliance or certification concerns with substitution?

A: No. Both parts maintain ROHS3 compliance, identical MSL ratings (3, 168 Hours), and equivalent regulatory classifications (EAR99, HTSUS 8542.39.0001). Substitution does not introduce compliance risks.

Q: Does the higher maximum input voltage of the RT8250GSP affect circuit design?

A: No. The RT8250GSP maintains the same minimum input voltage (4.5V) and identical switching frequency (340kHz) as the AP3503MPTR-G1. The extended maximum input rating (23V versus 18V) provides additional operational margin without requiring design changes for applications operating within the original 18V specification.

Q: Is the RT8250GSP available in the same packaging options?

A: The RT8250GSP is supplied in Cut Tape (CT) and Digi-Reel packaging formats. Both provide the same 8-SOIC component in identical physical configuration. Packaging format selection depends on assembly process requirements rather than functional compatibility.

Q: What is the inventory status for the substitute part?

A: The RT8250GSP maintains active inventory status with 24,545 pieces available as new original stock, ensuring reliable supply availability compared to the obsolete AP3503MPTR-G1 (20,300 pieces remaining stock).