MP2451DT-LF-Z Equivalent & Substitute Parts

Part Overview

The MP2451DT-LF-Z is a buck switching regulator IC manufactured by Monolithic Power Systems Inc., designed for positive adjustable output applications with 600mA current capability in a SOT-23-6 surface mount package. This device operates across a 3.3V to 36V input range with adjustable output from 0.8V to 28.8V and a 2MHz switching frequency.

The MP2451DT-LF-Z carries a "Not For New Designs" product status, indicating it is no longer recommended for new circuit development. Identifying qualified substitute components is essential for design continuity, production planning, and long-term supply chain management.

Substiute Parts

MP2451DT-LF-Z

Monolithic Power Systems Inc.In Stock: 205230MP2451DT-LF-Z Datasheet

Current PartRFQ

AOZ1282CI-1

Alpha & Omega Semiconductor Inc.In Stock: 8544AOZ1282CI-1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MP2451DT-LF-Z is determined by the following critical parameters:

• Topology & Function: Buck (step-down) switching regulator with positive adjustable output
• Output Characteristics: Adjustable output voltage with minimum 0.8V capability and 600mA current rating
• Package Compatibility: SOT-23-6 surface mount package for direct board-level replacement
• Input Voltage Range: Minimum 3.3V input support with maximum 36V tolerance
• Electrical Performance: Switching frequency, output voltage range, and thermal operating range

The AOZ1282CI-1 qualifies as a substitute based on matching topology, output configuration, current rating, package type, and overlapping electrical specifications within the defined parameter set.

Parameter Comparison

Engineering Selection Recommendations

The AOZ1282CI-1 is an active substitute for the MP2451DT-LF-Z based on the following engineering criteria:

Functional Equivalence: Both devices implement identical buck topology with positive adjustable output configuration, 600mA current capability, and SOT-23-6 package compatibility, enabling direct board-level replacement without layout modification.

Compliance & Certification: Both parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring equivalent environmental and regulatory qualification status.

Product Status Advantage: The AOZ1282CI-1 carries Active product status, providing long-term design support and supply chain continuity compared to the MP2451DT-LF-Z "Not For New Designs" designation.

Parameter Considerations: The AOZ1282CI-1 exhibits a 4.5V minimum input voltage requirement compared to 3.3V for the MP2451DT-LF-Z. Applications requiring operation below 4.5V input must retain the original MP2451DT-LF-Z or identify alternative solutions. The AOZ1282CI-1 operates at 1MHz switching frequency versus 2MHz for the MP2451DT-LF-Z, affecting EMI characteristics and component selection. The AOZ1282CI-1 supports output voltage up to 30.6V, exceeding the MP2451DT-LF-Z maximum of 28.8V. Operating temperature range differs, with the MP2451DT-LF-Z rated to 125°C junction temperature versus 85°C ambient for the AOZ1282CI-1.

Frequently Asked Questions (FAQ)

Q: Can the AOZ1282CI-1 directly replace the MP2451DT-LF-Z on existing PCBs?

A: Yes, the AOZ1282CI-1 is pin-compatible in the SOT-23-6 package and can be substituted without PCB layout changes. However, verify that your application input voltage meets the 4.5V minimum requirement and that the 1MHz switching frequency is acceptable for your EMI and filtering design.

Q: What is the primary reason to consider substitution?

A: The MP2451DT-LF-Z carries "Not For New Designs" status, indicating discontinued development support. The AOZ1282CI-1 is an active product with ongoing manufacturer support, making it suitable for new designs and long-term production continuity.

Q: Are there input voltage limitations when substituting?

A: Yes. The AOZ1282CI-1 requires a minimum input voltage of 4.5V, while the MP2451DT-LF-Z operates from 3.3V. If your application requires input voltages between 3.3V and 4.5V, the original MP2451DT-LF-Z must be retained or an alternative device selected.

Q: How does the switching frequency difference affect circuit design?

A: The AOZ1282CI-1 operates at 1MHz compared to the MP2451DT-LF-Z at 2MHz. Lower switching frequency typically results in reduced EMI but may require larger output filter components. Verify that output ripple and transient response specifications remain acceptable for your application.

Q: Are both devices RoHS compliant?

A: Yes, both the MP2451DT-LF-Z and AOZ1282CI-1 are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, ensuring equivalent environmental qualification.

Q: What is the temperature operating range difference?

A: The MP2451DT-LF-Z is rated to 125°C junction temperature, while the AOZ1282CI-1 is rated to 85°C ambient temperature. For applications requiring operation above 85°C ambient, thermal analysis is required to confirm the AOZ1282CI-1 remains within specification.