AOZ1031AI Equivalent & Substitute Parts

Part Overview

The AOZ1031AI 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 across a 4.5V to 18V input range and delivers adjustable output from 0.8V to 18V. The part is classified as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity.

Key Parameters

Parameter	AOZ1031AI
Manufacturer	Alpha & Omega Semiconductor Inc.
Category	Power Management (PMIC)
Function	Step-Down (Buck)
Output Configuration	Positive Adjustable
Number of Outputs	1
Voltage - Input (Min/Max)	4.5V / 18V
Voltage - Output (Min/Max)	0.8V / 18V
Current - Output	3A
Frequency - Switching	600kHz
Synchronous Rectifier	Yes
Operating Temperature	-40°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the AOZ1031AI is determined by the following critical parameters:

Input voltage range: 4.5V to 18V minimum requirement
Output current capability: 3A minimum
Output voltage adjustability: 0.8V minimum reference
Topology: Buck (step-down) switching regulator
Synchronous rectification: Required
Series compatibility: EZBuck™ family preferred for functional alignment

The AOZ6689CI qualifies as a manufacturer-recommended substitute based on matching these core electrical specifications while offering improved product status (Active) and extended operating temperature range.

Parameter Comparison

Parameter	AOZ1031AI	AOZ6689CI	Compatibility Notes
Manufacturer	Alpha & Omega Semiconductor Inc.	Alpha & Omega Semiconductor Inc.	Same manufacturer
Series	EZBuck™	EZBuck™	Same product family
Function	Step-Down	Step-Down	Identical topology
Output Configuration	Positive Adjustable	Positive Adjustable	Identical output type
Voltage - Input (Min/Max)	4.5V / 18V	4.5V / 18V	Identical input range
Voltage - Output (Min)	0.8V	0.8V	Identical minimum output
Voltage - Output (Max)	18V	6V	AOZ6689CI limited to 6V maximum output
Current - Output	3A	3A	Identical output current
Frequency - Switching	600kHz	750kHz	AOZ6689CI operates at higher frequency
Synchronous Rectifier	Yes	Yes	Both include synchronous rectification
Operating Temperature	-40°C ~ 85°C	-40°C ~ 125°C	AOZ6689CI supports extended temperature range
Package / Case	8-SOIC (0.154", 3.90mm Width)	SOT-23-6 Thin, TSOT-23-6	Different package footprints; PCB redesign required
Product Status	Obsolete	Active	AOZ6689CI actively manufactured and supported
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Both meet RoHS3 requirements
MSL Rating	1 (Unlimited)	1 (Unlimited)	Identical moisture sensitivity level

Engineering Selection Recommendations

The AOZ6689CI is the manufacturer-recommended substitute for the obsolete AOZ1031AI. Selection of this alternative is justified by the following factors:

Active product status ensures long-term availability and manufacturing support
Identical input voltage range (4.5V to 18V) and output current (3A) maintain core power delivery specifications
Extended operating temperature range (-40°C to 125°C) provides improved thermal margin compared to the original part (-40°C to 85°C)
Both devices maintain ROHS3 compliance and unlimited MSL rating
Higher switching frequency (750kHz vs. 600kHz) may reduce external component size in new designs

Critical design consideration: The AOZ6689CI maximum output voltage is limited to 6V, compared to 18V for the AOZ1031AI. Applications requiring output voltages above 6V cannot use this substitute without functional compromise. Additionally, the package change from 8-SOIC to SOT-23-6 requires PCB layout modification and component placement redesign.

Frequently Asked Questions (FAQ)

Q: Can the AOZ6689CI directly replace the AOZ1031AI without PCB modifications?

A: No. The AOZ6689CI uses a SOT-23-6 package while the AOZ1031AI uses an 8-SOIC package. Different pin counts and footprints require PCB redesign. Pin function mapping must be verified against both datasheets before implementation.

Q: What is the maximum output voltage for the AOZ6689CI?

A: The AOZ6689CI supports adjustable output from 0.8V to 6V maximum. If your application requires output voltages above 6V, this substitute is not suitable. The AOZ1031AI supports output up to 18V.

Q: Are there any temperature operating differences between these parts?

A: Yes. The AOZ1031AI operates from -40°C to 85°C, while the AOZ6689CI extends to -40°C to 125°C. The AOZ6689CI provides a 40°C higher upper temperature limit, beneficial for high-temperature environments.

Q: Why is the AOZ1031AI listed as obsolete?

A: The AOZ1031AI has been discontinued by the manufacturer. The AOZ6689CI represents the active product line continuation within the EZBuck™ family, offering improved specifications and ongoing manufacturing support.

Q: Do both parts require the same external component values?

A: External component selection depends on specific output voltage, current, and frequency requirements. The higher switching frequency of the AOZ6689CI (750kHz vs. 600kHz) may allow smaller inductor and capacitor values. Consult the respective datasheets for compensation network design.

Q: Are compliance certifications identical between these parts?

A: Both the AOZ1031AI and AOZ6689CI are ROHS3 compliant with MSL rating 1 (Unlimited). REACH status is unaffected for both devices, and both carry ECCN classification EAR99.

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