AOZ1037PI Equivalent & Substitute Parts

Part Overview

The AOZ1037PI is a buck switching regulator IC from Alpha & Omega Semiconductor Inc., designed for positive adjustable step-down voltage regulation with 5A output current capability. It operates across a 4.5V to 18V input range and delivers adjustable output from 0.8V to 18V. The device features synchronous rectification and is housed in an 8-SOIC package with exposed pad.

The AOZ1037PI is classified as obsolete. Identifying suitable substitute components is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production requirements for applications currently utilizing this regulator.

Substiute Parts

AOZ1037PI

Alpha & Omega Semiconductor Inc.In Stock: 334394AOZ1037PI Datasheet

Current PartRFQ

AOZ6689CI

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

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AOZ1037PI is evaluated based on the following critical parameters that define functional equivalence:

• Input voltage range compatibility (4.5V – 18V minimum requirement)
• Output voltage adjustability (0.8V minimum output capability)
• Output current capacity (5A or greater)
• Synchronous rectification capability
• Operating temperature range (-40°C to 85°C minimum)
• RoHS3 compliance and regulatory alignment
• Manufacturer support and product status

The AOZ6689CI is identified as a manufacturer-recommended substitute. While it operates within the same input voltage window and maintains adjustable output from 0.8V, its maximum output current is reduced to 3A and output voltage maximum is limited to 6V. These differences require design evaluation for applications demanding the full 5A output or output voltages exceeding 6V.

Parameter Comparison

Engineering Selection Recommendations

The AOZ6689CI is the manufacturer-recommended substitute for the obsolete AOZ1037PI. Both devices are ROHS3 compliant and maintain the same input voltage operating window and adjustable output voltage floor of 0.8V.

Selection of the AOZ6689CI requires design verification in the following areas:

• Applications requiring output current exceeding 3A are not suitable for this substitute
• Applications requiring output voltages above 6V are not suitable for this substitute
• The AOZ6689CI operates at a higher switching frequency (750kHz vs. 500kHz), which may affect PCB layout and filtering requirements
• Package transition from 8-SOIC to SOT-23-6 requires PCB redesign
• The AOZ6689CI features an extended operating temperature range (-40°C to 125°C) and superior moisture sensitivity rating (MSL 1 vs. MSL 3), providing improved reliability margins

For applications within the 3A current and 6V output voltage constraints, the AOZ6689CI provides active product status and enhanced environmental specifications compared to the obsolete AOZ1037PI.

Frequently Asked Questions (FAQ)

Q: Can the AOZ6689CI directly replace the AOZ1037PI in existing designs?

A: Direct replacement is not possible due to package incompatibility (8-SOIC vs. SOT-23-6) and reduced current rating (3A vs. 5A). PCB redesign is required. Applications must operate within 3A output current and 6V maximum output voltage limits.

Q: What are the key differences between these two regulators?

A: The primary differences are output current capacity (5A vs. 3A), maximum output voltage (18V vs. 6V), switching frequency (500kHz vs. 750kHz), package type (8-SOIC vs. SOT-23-6), and product status (obsolete vs. active). Both maintain the same input voltage range and 0.8V minimum output voltage.

Q: Is the AOZ6689CI suitable for high-current applications?

A: The AOZ6689CI is rated for 3A maximum output current. Applications requiring 5A output current must identify alternative solutions, as this substitute does not meet the current requirement.

Q: What is the impact of the package change from 8-SOIC to SOT-23-6?

A: The package transition requires complete PCB layout redesign. The SOT-23-6 package is significantly smaller than the 8-SOIC package, affecting board space, thermal management, and trace routing. Thermal performance must be re-evaluated for the new package.

Q: Are both devices RoHS compliant?

A: Yes, both the AOZ1037PI and AOZ6689CI are ROHS3 compliant and meet the same regulatory requirements for hazardous substance restrictions.

Q: Why is the AOZ6689CI rated for a higher operating temperature range?

A: The AOZ6689CI specifies -40°C to 125°C operating temperature, compared to -40°C to 85°C for the AOZ1037PI. This extended range reflects the device design and manufacturing process capabilities of the active product line.