AOZ1237QI-02 Equivalent & Substitute Parts

Part Overview

The AOZ1237QI-02 is a buck switching regulator IC from Alpha & Omega Semiconductor Inc., designed for positive adjustable step-down voltage regulation with 8A output current capability. This device operates across a 2.7V to 24V input range and delivers adjustable output from 0.8V to 20.4V, making it suitable for diverse power management applications requiring compact surface-mount solutions.

The AOZ1237QI-02 is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for systems currently utilizing this component.

Substiute Parts

AOZ1237QI-02

Alpha & Omega Semiconductor Inc.In Stock: 9123AOZ1237QI-02 Datasheet

Current PartRFQ

AOZ2153EQI-30

Alpha & Omega Semiconductor Inc.In Stock: 29097AOZ2153EQI-30 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AOZ1237QI-02 is determined by the following critical parameters:

• Output current capability: 8A (exact match required)
• Output configuration: Positive adjustable topology
• Minimum output voltage: 0.8V (substitute must support this floor)
• Operating temperature range: -40°C to 85°C (minimum requirement)
• Synchronous rectifier: Yes (efficiency requirement)
• Manufacturer series: EZBuck™ (same product family)

The AOZ2153EQI-30 qualifies as a manufacturer-recommended substitute. While it operates at a fixed 1MHz switching frequency (versus the AOZ1237QI-02's variable 100kHz–1MHz range) and has a higher minimum input voltage (6.5V versus 2.7V), it maintains the 8A output current, adjustable 0.8V minimum output, and identical operating temperature range. The AOZ2153EQI-30 is active in production, ensuring long-term availability.

Parameter Comparison

Engineering Selection Recommendations

The AOZ2153EQI-30 is the manufacturer-recommended substitute for the obsolete AOZ1237QI-02. Both devices maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment.

Key considerations for substitution:

• The AOZ2153EQI-30 requires a minimum input voltage of 6.5V, compared to 2.7V for the AOZ1237QI-02. Applications operating below 6.5V input cannot use this substitute.
• The AOZ2153EQI-30 operates at a fixed 1MHz switching frequency, whereas the AOZ1237QI-02 supports variable frequency operation (100kHz–1MHz). This affects EMI characteristics and component selection for filtering networks.
• The AOZ2153EQI-30 package is smaller (18-PowerWFQFN, 3x3mm) versus the AOZ1237QI-02 (23-PowerTFQFN, 4x4mm), requiring PCB layout redesign.
• The AOZ2153EQI-30 has an MSL rating of 3 (168 hours), versus MSL 1 (unlimited) for the AOZ1237QI-02, affecting moisture handling and storage protocols.
• The AOZ2153EQI-30 is in active production with 29,051 units in stock, ensuring supply continuity.

Frequently Asked Questions (FAQ)

Q: Can the AOZ2153EQI-30 directly replace the AOZ1237QI-02 without circuit modifications?

A: Direct replacement is not possible due to package differences (23-PowerTFQFN versus 18-PowerWFQFN) and minimum input voltage requirements. PCB layout redesign is required. Applications with input voltages below 6.5V cannot use the AOZ2153EQI-30.

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

A: The AOZ2153EQI-30 has a higher minimum input voltage (6.5V versus 2.7V), higher maximum output voltage (23.8V versus 20.4V), and fixed 1MHz switching frequency (versus variable 100kHz–1MHz). Output current and adjustable output voltage floor remain identical at 8A and 0.8V respectively.

Q: Are there any compliance or certification differences?

A: Both parts are ROHS3 compliant and REACH unaffected. The AOZ2153EQI-30 has a higher MSL rating (3 versus 1), requiring stricter moisture control during storage and handling.

Q: Why is the AOZ1237QI-02 obsolete?

A: The AOZ1237QI-02 has been superseded by the AOZ2153EQI-30 within the EZBuck™ product family. The newer device offers improved specifications and active production support.

Q: What is the impact of the fixed 1MHz switching frequency on circuit design?

A: The fixed 1MHz frequency simplifies EMI filter design compared to the variable frequency operation of the AOZ1237QI-02. However, applications requiring lower switching frequencies for specific noise or efficiency requirements may need alternative solutions.