AOZ1021AI Equivalent & Substitute Parts

Part Overview

The AOZ1021AI is a buck switching regulator IC from Alpha & Omega Semiconductor Inc., designed for positive adjustable output applications with 3A output current capability. This device operates in the 4.5V to 16V input range and delivers adjustable output from 0.8V to 16V. The part is housed in an 8-SOIC package and features synchronous rectification with a 500kHz switching frequency.

The AOZ1021AI is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production requirements for applications currently utilizing this regulator.

Substiute Parts

AOZ1021AI

Alpha & Omega Semiconductor Inc.In Stock: 19244AOZ1021AI Datasheet

Current PartRFQ

AOZ6689CI

Alpha & Omega Semiconductor Inc.In Stock: 1196AOZ6689CI Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the AOZ1021AI are identified based on functional equivalence within the allowed electrical and mechanical parameters. The primary substitute, AOZ6689CI, maintains core functional characteristics: buck topology, positive adjustable output, 3A output current, and synchronous rectification.

The substitution is valid based on the following criteria:

• Identical function (step-down buck regulator)
• Identical output configuration (positive adjustable)
• Identical output current rating (3A)
• Identical minimum output voltage (0.8V)
• Synchronous rectifier present in both designs
• Both devices are from the same manufacturer (Alpha & Omega Semiconductor Inc.)
• Both comply with ROHS3 and maintain MSL 1 rating

Differences in input voltage maximum (16V vs. 18V), output voltage maximum (16V vs. 6V), switching frequency (500kHz vs. 750kHz), operating temperature range (-40°C ~ 85°C vs. -40°C ~ 125°C), and package type (8-SOIC vs. TSOT-23-6) must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

The AOZ6689CI is the manufacturer-recommended substitute for the obsolete AOZ1021AI. Both devices maintain ROHS3 compliance and MSL 1 rating, ensuring regulatory and environmental compatibility.

The AOZ6689CI offers extended input voltage tolerance (18V maximum vs. 16V) and improved operating temperature range (-40°C ~ 125°C vs. -40°C ~ 85°C), providing broader application flexibility. The higher switching frequency (750kHz) may reduce external component size requirements in new designs.

The primary design consideration is the reduced maximum output voltage of the AOZ6689CI (6V vs. 16V). Applications requiring output voltages above 6V cannot use this substitute. Additionally, the package change from 8-SOIC to TSOT-23-6 requires PCB layout modification and may affect thermal management characteristics.

The AOZ6689CI is currently in active production status, ensuring long-term availability and supply chain stability compared to the obsolete AOZ1021AI.

Frequently Asked Questions (FAQ)

Q: Can the AOZ6689CI directly replace the AOZ1021AI in all applications?

A: No. The AOZ6689CI has a maximum output voltage of 6V, while the AOZ1021AI supports up to 16V. Applications requiring output voltages above 6V require alternative solutions. The package change from 8-SOIC to TSOT-23-6 also necessitates PCB redesign.

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

A: The AOZ6689CI provides higher maximum input voltage (18V vs. 16V), extended operating temperature range (-40°C ~ 125°C vs. -40°C ~ 85°C), and higher switching frequency (750kHz vs. 500kHz). The output voltage maximum is lower (6V vs. 16V).

Q: Are both parts RoHS compliant?

A: Yes. Both the AOZ1021AI and AOZ6689CI are ROHS3 compliant with MSL 1 rating, meeting current environmental and regulatory requirements.

Q: Why is the AOZ1021AI obsolete?

A: The AOZ1021AI is classified as obsolete by the manufacturer. The AOZ6689CI represents the active product line continuation for similar buck regulator applications within its specified voltage and current parameters.

Q: What PCB modifications are required when switching from AOZ1021AI to AOZ6689CI?

A: The package change from 8-SOIC to TSOT-23-6 requires complete PCB layout redesign. Pin assignments, footprint dimensions, and thermal management approaches differ between these packages. Schematic verification is necessary to confirm pin compatibility.

Q: Is the higher switching frequency of the AOZ6689CI beneficial?

A: The 750kHz switching frequency of the AOZ6689CI (vs. 500kHz for AOZ1021AI) typically allows for smaller external inductor and capacitor components, potentially reducing board space and cost in new designs. Existing designs optimized for 500kHz operation should be re-evaluated.