AOZ1052PI Equivalent & Substitute Parts

Part Overview

The AOZ1052PI is a buck switching regulator IC from Alpha & Omega Semiconductor Inc., designed for step-down voltage conversion with positive adjustable output. It delivers 4A output current across an input voltage range of 4.5V to 18V, with adjustable output from 0.8V to 15.3V. The device operates at 450kHz switching frequency and includes a synchronous rectifier for improved efficiency.

The AOZ1052PI 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

AOZ1052PI

Alpha & Omega Semiconductor Inc.In Stock: 34218AOZ1052PI Datasheet

Current PartRFQ

ST1S41PHR

STMicroelectronicsIn Stock: 17486ST1S41PHR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AOZ1052PI is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

• Topology: Buck switching regulator
• Output Configuration: Positive adjustable
• Number of Outputs: Single output
• Package Type: 8-SOIC with exposed pad
• Output Current Rating: 4A minimum
• Synchronous Rectifier: Present
• Input Voltage Range: Minimum 4.5V, maximum 18V or higher
• Output Voltage Adjustability: Minimum 0.8V floor
• RoHS Compliance: ROHS3 Compliant

The ST1S41PHR meets all critical substitution criteria. Both devices share identical package geometry, output current capability, synchronous rectification architecture, and regulatory compliance. Differences in switching frequency, maximum output voltage, and operating temperature range do not preclude substitution when the application requirements fall within the ST1S41PHR specifications.

Parameter Comparison

Engineering Selection Recommendations

The ST1S41PHR is a direct functional substitute for the AOZ1052PI based on the following engineering criteria:

Regulatory and Compliance Alignment: Both devices maintain ROHS3 compliance and EAR99 export classification, ensuring regulatory continuity in applications subject to environmental and trade restrictions.

Product Lifecycle Status: The AOZ1052PI is obsolete, while the ST1S41PHR is actively manufactured by STMicroelectronics. Selection of the ST1S41PHR ensures long-term supply availability and ongoing manufacturer support.

Electrical Parameter Compatibility: The ST1S41PHR operates within or exceeds all critical electrical specifications of the AOZ1052PI. The extended maximum output voltage (18V vs. 15.3V) and higher switching frequency (850kHz vs. 450kHz) provide design flexibility without compromising backward compatibility. The lower minimum input voltage (4V vs. 4.5V) expands application scope.

Thermal Performance: The ST1S41PHR supports an extended operating temperature range (-40°C to 150°C junction temperature) compared to the AOZ1052PI (-40°C to 85°C ambient temperature), providing enhanced reliability in demanding thermal environments.

Package Equivalence: Identical 8-SOIC package geometry with exposed pad ensures direct PCB layout compatibility without redesign.

Frequently Asked Questions (FAQ)

Q: Can the ST1S41PHR directly replace the AOZ1052PI without PCB modifications?

A: Yes. Both devices use identical 8-SOIC (0.154", 3.90mm Width) exposed pad packaging. Pin-to-pin compatibility and footprint equivalence allow direct substitution without PCB layout changes.

Q: What is the impact of the higher switching frequency in the ST1S41PHR (850kHz vs. 450kHz)?

A: Higher switching frequency typically reduces output filter component size and improves transient response. Applications designed for the AOZ1052PI will function with the ST1S41PHR; however, output filter inductance and capacitance values may require optimization for the new frequency to maintain equivalent ripple characteristics.

Q: Are there output voltage range limitations when substituting?

A: The ST1S41PHR supports output voltages from 0.8V to 18V, compared to the AOZ1052PI range of 0.8V to 15.3V. Applications requiring output voltages between 15.3V and 18V can only be implemented with the ST1S41PHR. Applications within the 0.8V to 15.3V range are fully compatible with both devices.

Q: Does the extended operating temperature range of the ST1S41PHR affect circuit design?

A: The ST1S41PHR's extended temperature range (-40°C to 150°C junction temperature) provides enhanced thermal margin. No circuit modifications are required; however, thermal management design may be optimized to take advantage of the higher temperature rating.

Q: What is the moisture sensitivity level difference between these devices?

A: The AOZ1052PI has MSL 1 (unlimited floor life), while the ST1S41PHR has MSL 3 (168-hour floor life). The ST1S41PHR requires standard moisture control during storage and handling per IPC-A-610 guidelines.

Q: Is the ST1S41PHR available in the same packaging options?

A: The ST1S41PHR is supplied in Cut Tape (CT) and Digi-Reel® packaging. The AOZ1052PI packaging format was not specified in the original data. Both devices use the same 8-SOIC case style, ensuring mechanical compatibility regardless of tape or reel format.