AOZ1051PI Equivalent & Substitute Parts

Part Overview

The AOZ1051PI 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 voltage from 0.8V to 15.3V. The part is classified as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity.

Substiute Parts

AOZ1051PI

Alpha & Omega Semiconductor Inc.In Stock: 20239AOZ1051PI Datasheet

Current PartRFQ

AOZ6689CI

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

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AOZ1051PI is based on functional equivalence within the EZBuck™ series from Alpha & Omega Semiconductor Inc. The primary substitution criterion is maintenance of core electrical specifications: buck topology, positive adjustable output, 3A output current, and compatible input voltage range (4.5V to 18V minimum). The AOZ6689CI qualifies as a direct substitute based on these electrical parameters. Differences in package form factor, switching frequency, maximum output voltage, and operating temperature range represent design trade-offs that must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

The AOZ6689CI is the manufacturer-recommended substitute for the obsolete AOZ1051PI. Both devices maintain identical input voltage range (4.5V to 18V), output current (3A), and minimum output voltage (0.8V), ensuring functional compatibility for most buck regulator applications within these core specifications.

Selection of AOZ6689CI over AOZ1051PI is supported by the following factors: active product status with ongoing manufacturer support, extended operating temperature range (-40°C to 125°C versus -40°C to 85°C), improved moisture sensitivity level (MSL 1 versus MSL 2), and higher switching frequency (750kHz versus 500kHz) which may reduce external component size in certain designs.

Design considerations for substitution include: the AOZ6689CI maximum output voltage is limited to 6V compared to the AOZ1051PI's 15.3V, requiring verification that application output voltage requirements do not exceed 6V; package change from 8-SOIC to SOT-23-6 necessitates PCB layout redesign and thermal management re-evaluation; and the higher switching frequency may require adjustment of external filter component values to maintain equivalent noise performance.

Both devices carry ROHS3 compliance and EAR99 export classification, maintaining regulatory equivalence.

Frequently Asked Questions (FAQ)

Q: Can AOZ6689CI directly replace AOZ1051PI without circuit modification?

A: Electrical substitution is possible if application output voltage requirements do not exceed 6V. PCB layout must be redesigned due to package change from 8-SOIC to SOT-23-6. External component values may require adjustment due to the 250kHz switching frequency difference.

Q: What is the primary limitation of using AOZ6689CI as a substitute?

A: The AOZ6689CI maximum output voltage is 6V, whereas the AOZ1051PI supports up to 15.3V. Applications requiring output voltages above 6V cannot use this substitute.

Q: How does the package change affect thermal performance?

A: The SOT-23-6 package has different thermal characteristics than the 8-SOIC package. Thermal analysis specific to the application PCB layout is required to ensure adequate heat dissipation for 3A output current operation.

Q: Are there compliance differences between these parts?

A: Both parts are ROHS3 compliant and carry EAR99 export classification. The AOZ6689CI has superior moisture sensitivity rating (MSL 1 with unlimited shelf life versus MSL 2 with 1-year limit), providing better long-term storage capability.

Q: Why is the switching frequency different?

A: The AOZ6689CI operates at 750kHz compared to the AOZ1051PI's 500kHz. Higher switching frequency typically allows smaller external inductors and capacitors but may increase switching losses and EMI considerations in the design.

Q: What is the inventory status of these parts?

A: AOZ1051PI is obsolete with 20,204 pieces available in current stock. AOZ6689CI is an active product with 1,092 pieces in current inventory, ensuring ongoing availability for new designs.