MP2451DT-LF-P Equivalent & Substitute Parts

Part Overview

The MP2451DT-LF-P 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-P 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 support, and long-term supply chain reliability.

Substiute Parts

MP2451DT-LF-P

Monolithic Power Systems Inc.In Stock: 852MP2451DT-LF-P 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-P is determined by the following critical parameters:

• Topology & Function: Buck (step-down) topology with positive adjustable output configuration
• Output Characteristics: Single output, adjustable from 0.8V minimum, 600mA current rating
• Package Compatibility: SOT-23-6 surface mount package
• Input Voltage Range: Minimum 3.3V to maximum 36V operation
• Switching Frequency: 2MHz operation
• Environmental Compliance: ROHS3 compliance and MSL 1 rating

The AOZ1282CI-1 qualifies as a substitute based on matching topology, output configuration, current rating, package type, and compliance certifications. Differences in input voltage minimum, output voltage maximum, switching frequency, and operating temperature range are noted in the parameter comparison.

Parameter Comparison

Engineering Selection Recommendations

The AOZ1282CI-1 is qualified as a substitute for the MP2451DT-LF-P based on functional equivalence in topology, output configuration, current rating, and package compatibility. Both devices are ROHS3 compliant with MSL 1 rating, meeting regulatory and environmental requirements.

The AOZ1282CI-1 carries an "Active" product status, ensuring ongoing manufacturer support and supply availability, which addresses the obsolescence concern of the MP2451DT-LF-P's "Not For New Designs" designation.

Parameter differences exist in input voltage minimum (4.5V vs. 3.3V), output voltage maximum (30.6V vs. 28.8V), switching frequency (1MHz vs. 2MHz), and operating temperature maximum (85°C vs. 125°C). These differences must be evaluated against specific circuit requirements to confirm substitution suitability for the intended application.

Frequently Asked Questions (FAQ)

Q: Can the AOZ1282CI-1 directly replace the MP2451DT-LF-P in existing designs?

A: Direct replacement is possible if the circuit design operates within the AOZ1282CI-1 parameter boundaries. The higher input voltage minimum (4.5V) and lower operating temperature maximum (85°C) must be confirmed as acceptable for the application. The lower switching frequency (1MHz) may affect circuit performance characteristics.

Q: Are the SOT-23-6 packages physically identical?

A: Both devices use the SOT-23-6 surface mount package, ensuring physical and footprint compatibility on PCBs. Pin assignments must be verified against individual datasheets to confirm functional pin correspondence.

Q: What is the significance of the "Not For New Designs" status on the MP2451DT-LF-P?

A: This status indicates the manufacturer no longer recommends the device for new circuit development. The AOZ1282CI-1, with "Active" status, is the recommended alternative for new designs requiring equivalent functionality.

Q: How do the switching frequencies affect circuit design?

A: The MP2451DT-LF-P operates at 2MHz while the AOZ1282CI-1 operates at 1MHz. Lower switching frequency typically results in larger output filter components and different EMI characteristics. Circuit design parameters dependent on switching frequency must be recalculated for the substitute device.

Q: Are both devices compliant with the same regulatory standards?

A: Both the MP2451DT-LF-P and AOZ1282CI-1 are ROHS3 compliant with MSL 1 rating, meeting equivalent regulatory and environmental requirements for component selection.