AP3591FNTR-G1 Equivalent & Substitute Parts

Part Overview

The AP3591FNTR-G1 is a buck regulator positive output step-down DC-DC controller IC manufactured by Diodes Incorporated in a 14-VFQFN exposed pad package. This component functions as a transistor driver for step-down voltage conversion with a single output phase and positive output configuration. The part is classified as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity.

Substiute Parts

AP3591FNTR-G1

Diodes IncorporatedIn Stock: 2276AP3591FNTR-G1 Datasheet

Current PartRFQ

NCP5217AMNTXG

onsemiIn Stock: 29555NCP5217AMNTXG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AP3591FNTR-G1 is determined by strict alignment of the following electrical and mechanical parameters:

• Topology & Function: Buck (step-down) regulator with positive output configuration
• Output Architecture: Single output, single phase transistor driver
• Package Compatibility: 14-VFQFN exposed pad form factor
• Supply Voltage Range: Minimum 4.5V input, maximum supply voltage of 26V or higher
• Synchronous Rectification: Integrated synchronous rectifier capability
• Operating Temperature Range: -40°C to 85°C ambient temperature rating
• Regulatory Compliance: ROHS3 compliance and EAR99 classification

The NCP5217AMNTXG from onsemi meets these substitution criteria through matching package geometry, functional topology, output configuration, and regulatory compliance status.

Parameter Comparison

Engineering Selection Recommendations

The NCP5217AMNTXG serves as a direct substitute for the AP3591FNTR-G1 based on functional equivalence and regulatory alignment. Both components are classified as obsolete products, indicating that either part may face long-term availability constraints. The NCP5217AMNTXG provides a marginally extended supply voltage range (27V maximum versus 26V) and improved moisture sensitivity characteristics (MSL 1 versus MSL 3), offering enhanced reliability in storage and handling conditions. Both parts maintain ROHS3 compliance and identical operating temperature specifications, ensuring regulatory continuity in applications requiring environmental standards adherence.

Frequently Asked Questions (FAQ)

Q: Can the NCP5217AMNTXG directly replace the AP3591FNTR-G1 in existing designs?

A: Yes. Both components share identical package geometry (14-VFQFN exposed pad), functional topology (buck step-down), output configuration (positive single phase), and operating temperature range (-40°C to 85°C). The supply voltage range of the NCP5217AMNTXG (4.5V ~ 27V) encompasses the AP3591FNTR-G1 specification (4.5V ~ 26V), ensuring compatibility across the original operating envelope.

Q: What is the significance of the different MSL ratings?

A: The AP3591FNTR-G1 carries MSL 3 (168 hours maximum floor life), while the NCP5217AMNTXG carries MSL 1 (unlimited floor life). MSL rating indicates moisture sensitivity during storage and handling. The lower MSL rating of the NCP5217AMNTXG provides greater flexibility in inventory management and reduces risk of moisture-induced failures during extended storage periods.

Q: Are there any control feature differences between these parts?

A: The AP3591FNTR-G1 includes Enable, On Time Control, Phase Control, and Power Good features. The NCP5217AMNTXG includes Enable and Power Good features. Applications requiring on-time control or phase control functionality must verify that the NCP5217AMNTXG control feature set meets circuit design requirements before implementation.

Q: Why are both parts classified as obsolete?

A: Obsolete status indicates that manufacturers have discontinued production. For applications requiring either component, inventory availability through authorized distributors should be verified. The NCP5217AMNTXG currently maintains higher inventory levels (29,496 units) compared to the AP3591FNTR-G1 (2,200 units), providing better near-term availability.