MP9115DQT-LF-P Equivalent & Substitute Parts

Part Overview

The MP9115DQT-LF-P is a buck switching regulator IC manufactured by Monolithic Power Systems Inc., designed for positive adjustable output applications. This device delivers 2.5A output current with an adjustable output voltage range from 0.8V to 6V, operating from a 2.7V to 6V input supply. The part is classified as "Not For New Designs," indicating it has reached end-of-life status. Finding equivalent or substitute parts is necessary for ongoing production support, maintenance applications, and legacy system repairs where continued component availability is required.

Substiute Parts

MP9115DQT-LF-P

Monolithic Power Systems Inc.In Stock: 918MP9115DQT-LF-P Datasheet

Current PartRFQ

RT8068AZQW

Richtek USA Inc.In Stock: 35233RT8068AZQW Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MP9115DQT-LF-P is determined by the following critical parameters:

• Package Compatibility: Both parts must use the 10-WFDFN Exposed Pad package to ensure PCB layout and thermal management compatibility
• Topology & Function: Both must be buck switching regulators with positive adjustable output configuration
• Input Voltage Range: The substitute must accept the same or wider input voltage range (minimum 2.7V to 6V)
• Output Voltage Range: The substitute must support the required output voltage window (minimum 0.8V to 6V)
• Output Current Capability: The substitute must deliver at least 2.5A continuous output current
• Synchronous Rectification: Both parts include integrated synchronous rectifiers for efficiency
• Compliance Standards: Both parts must maintain ROHS3 compliance and EAR99 export classification

The RT8068AZQW from Richtek USA Inc. meets these substitution criteria and is classified as an active product with current manufacturing support.

Parameter Comparison

Engineering Selection Recommendations

The RT8068AZQW qualifies as a functional substitute for the MP9115DQT-LF-P based on the following engineering criteria:

Compliance & Certification: Both parts maintain ROHS3 compliance and EAR99 export classification, ensuring regulatory alignment for existing applications.

Product Status Advantage: The RT8068AZQW is classified as an active product with current manufacturing support from Richtek USA Inc., providing long-term component availability compared to the MP9115DQT-LF-P, which is designated "Not For New Designs."

Package Compatibility: Identical 10-WFDFN Exposed Pad packaging ensures direct PCB layout compatibility without redesign requirements.

Functional Equivalence: Both devices implement buck topology with positive adjustable output, synchronous rectification, and surface mount configuration.

Performance Considerations: The RT8068AZQW delivers 3A output current, exceeding the 2.5A requirement of the original part. However, the maximum input voltage is limited to 5.5V compared to 6V for the MP9115DQT-LF-P, and the maximum output voltage is 5.5V versus 6V. Applications requiring input or output voltages above 5.5V cannot use the RT8068AZQW as a direct substitute. The switching frequency differs at 1MHz versus 1.2MHz, which may affect filter component selection and EMI characteristics in the application circuit.

Temperature Range: The MP9115DQT-LF-P supports operation down to -40°C, while the RT8068AZQW operates from -10°C. Applications requiring extended low-temperature operation must verify compatibility.

Frequently Asked Questions (FAQ)

Q: Can the RT8068AZQW replace the MP9115DQT-LF-P in all applications?

A: The RT8068AZQW is functionally compatible for applications where input voltage does not exceed 5.5V and output voltage does not exceed 5.5V. Applications requiring higher voltage operation must use the original MP9115DQT-LF-P or identify alternative parts with higher voltage ratings.

Q: What is the significance of the different switching frequencies (1.2MHz vs. 1MHz)?

A: Switching frequency affects the size and selection of external filter components (inductors and capacitors). The lower 1MHz frequency of the RT8068AZQW may require larger filter components compared to the 1.2MHz design of the MP9115DQT-LF-P. Circuit redesign and component recalculation are necessary when substituting between these parts.

Q: Are the packages truly identical?

A: Both parts use the 10-WFDFN Exposed Pad package with 3x3mm dimensions. The pinout and thermal pad configuration are compatible, allowing direct PCB layout reuse without modification.

Q: Why does the RT8068AZQW have a higher current rating (3A vs. 2.5A)?

A: The RT8068AZQW is designed with higher current capability, making it suitable for applications requiring up to 3A. Using a higher-rated device in a lower-current application does not create compatibility issues; the device will operate within its safe operating area.

Q: What is the impact of different moisture sensitivity levels?

A: The MP9115DQT-LF-P has MSL 1 (unlimited shelf life), while the RT8068AZQW has MSL 3 (168-hour limit after moisture exposure). The RT8068AZQW requires more stringent moisture control during storage and handling. Verify that your supply chain and manufacturing processes accommodate MSL 3 requirements.

Q: Is the RT8068AZQW suitable for low-temperature applications?

A: The RT8068AZQW operates from -10°C minimum, compared to -40°C for the MP9115DQT-LF-P. Applications requiring operation below -10°C must use the original part or identify alternatives with extended low-temperature ratings.