AOZ1031AI_2 Equivalent & Substitute Parts

Part Overview

The AOZ1031AI_2 is a buck switching regulator IC from Alpha & Omega Semiconductor Inc., designed for positive adjustable step-down voltage regulation with 3A output current capability. This device operates across a 4.5V to 18V input range and delivers adjustable output voltage from 0.8V to 18V, making it suitable for various power management applications requiring compact surface mount solutions.

The AOZ1031AI_2 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

AOZ1031AI_2

Alpha & Omega Semiconductor Inc.In Stock: 779AOZ1031AI_2 Datasheet

Current PartRFQ

AOZ6643DI

Alpha & Omega Semiconductor Inc.In Stock: 869AOZ6643DI Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AOZ1031AI_2 is based on strict alignment of the following critical electrical and mechanical parameters:

• Input voltage range: 4.5V to 18V minimum compatibility
• Output current capability: 3A minimum
• Output voltage adjustability: 0.8V minimum reference voltage
• Topology: Buck (step-down) switching regulator
• Output configuration: Single positive output
• Synchronous rectification capability
• Operating temperature range: -40°C to 85°C
• Surface mount packaging with compatible pinout and thermal characteristics
• Manufacturer: Alpha & Omega Semiconductor Inc. (same family ecosystem)

The AOZ6643DI meets all substitution criteria as an active product within the same EZBuck™ series, offering equivalent or superior electrical performance with modern packaging and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The AOZ6643DI is the manufacturer-recommended substitute for the obsolete AOZ1031AI_2. Selection of this substitute is justified on the following engineering grounds:

• The AOZ6643DI maintains active product status, ensuring long-term availability and supply chain stability compared to the obsolete AOZ1031AI_2.
• Both devices are members of the Alpha & Omega Semiconductor EZBuck™ series, sharing the same design architecture and control methodology.
• Electrical specifications are equivalent across all critical parameters: input voltage range (4.5V–18V), output current (3A), adjustable output voltage (0.8V minimum), and operating temperature range (-40°C to 85°C).
• The AOZ6643DI incorporates RoHS3 compliance and EAR99 export classification, meeting modern regulatory requirements.
• Package transition from 8-SOIC to 8-DFN-EP (3x3) with exposed pad provides improved thermal performance and smaller footprint, typical of modern component evolution.
• Switching frequency difference (500kHz vs. 600kHz) does not affect functional substitution; both frequencies are within acceptable ranges for buck regulator operation.
• Maximum output voltage specification of 15.3V on the AOZ6643DI remains compatible with applications requiring up to 15.3V output; applications requiring output above 15.3V require design review.

Frequently Asked Questions (FAQ)

Q: Can the AOZ6643DI directly replace the AOZ1031AI_2 without PCB modifications?

A: The AOZ6643DI requires PCB layout changes due to package transition from 8-SOIC to 8-DFN-EP. Pinout compatibility must be verified against the respective datasheets. The exposed pad on the DFN package requires thermal via design for optimal performance.

Q: What is the impact of the 500kHz switching frequency on the AOZ6643DI versus the 600kHz of the AOZ1031AI_2?

A: The 100kHz frequency difference does not affect functional equivalence. Both frequencies operate within acceptable ranges for buck regulator applications. Output filter component selection may require minor adjustment based on the lower switching frequency of the substitute.

Q: Are there output voltage limitations when using the AOZ6643DI?

A: The AOZ6643DI supports adjustable output voltage from 0.8V to 15.3V. Applications requiring output voltages between 15.3V and 18V must use alternative components or confirm compatibility through detailed design analysis.

Q: What are the compliance and certification differences between these parts?

A: The AOZ1031AI_2 is obsolete with no active compliance status. The AOZ6643DI is RoHS3 compliant and classified under EAR99 export control, meeting current regulatory and trade requirements.

Q: Is the MSL (Moisture Sensitivity Level) rating the same for both parts?

A: Yes, both the AOZ1031AI_2 and AOZ6643DI carry MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.