MP28115DQ-LF-Z Equivalent & Substitute Parts

Part Overview

The MP28115DQ-LF-Z is a buck switching regulator IC manufactured by Monolithic Power Systems Inc., designed for positive adjustable step-down voltage regulation with 4A output current capability. This device operates across an input voltage range of 2.7V to 6V and provides adjustable output voltage from 0.8V to 5.4V at a switching frequency of 1.5MHz. The part is marked as Not For New Designs, indicating it has been superseded in the manufacturer's product roadmap. Finding equivalent or substitute parts is necessary for applications requiring continued supply, design flexibility, or performance optimization in new implementations.

Substiute Parts

MP28115DQ-LF-Z

Monolithic Power Systems Inc.In Stock: 6361MP28115DQ-LF-Z Datasheet

Current PartRFQ

SC174MLTRT

Semtech CorporationIn Stock: 218146SC174MLTRT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MP28115DQ-LF-Z is determined by the following critical parameters:

• Topology & Function: Buck (step-down) switching regulator with positive adjustable output
• Output Current Rating: 4A minimum capability
• Package Compatibility: 10-VFDFN Exposed Pad form factor (3x3mm)
• Voltage Specifications: Input range overlap and output voltage adjustability range
• Synchronous Rectification: Presence of integrated synchronous rectifier
• Switching Frequency: Operating frequency suitable for the application
• Regulatory Compliance: RoHS and REACH compliance status

The SC174MLTRT from Semtech Corporation qualifies as a substitute based on matching topology, output current, package form factor, and regulatory compliance. Both devices employ buck topology with 4A output capability in identical 10-VFDFN packages with exposed pads and synchronous rectification.

Parameter Comparison

Engineering Selection Recommendations

Both the MP28115DQ-LF-Z and SC174MLTRT are marked as Not For New Designs, indicating neither manufacturer recommends these parts for new product development. Both devices maintain RoHS compliance and MSL Level 1 moisture sensitivity ratings, suitable for standard manufacturing and storage conditions.

The SC174MLTRT offers an extended operating temperature range (-40°C to 125°C junction temperature versus -40°C to 85°C ambient for the MP28115DQ-LF-Z), providing thermal margin for applications operating in elevated ambient conditions. The SC174MLTRT input voltage maximum is 5.5V compared to 6V for the MP28115DQ-LF-Z, requiring verification that the application input voltage does not exceed 5.5V.

The switching frequency range of the SC174MLTRT (200kHz to 1MHz) encompasses the fixed 1.5MHz of the MP28115DQ-LF-Z only at the upper boundary. Applications sensitive to switching frequency characteristics should evaluate this difference.

Both devices share identical package geometry (10-VFDFN, 3x3mm) and pinout compatibility, enabling direct PCB layout substitution without redesign.

Frequently Asked Questions (FAQ)

Q: Can the SC174MLTRT directly replace the MP28115DQ-LF-Z on existing PCBs?

A: Yes. Both devices use the 10-VFDFN Exposed Pad package with 3x3mm dimensions. Pinout compatibility and identical package footprints enable direct substitution without PCB layout modification.

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

A: The MP28115DQ-LF-Z accepts input voltage from 2.7V to 6V, while the SC174MLTRT operates from 3V to 5.5V. Applications using input voltages below 3V or above 5.5V require the MP28115DQ-LF-Z. Output voltage ranges are similar: MP28115DQ-LF-Z provides 0.8V to 5.4V, and SC174MLTRT provides 0.75V to 5.23V.

Q: How do the switching frequencies compare?

A: The MP28115DQ-LF-Z operates at a fixed 1.5MHz switching frequency. The SC174MLTRT operates across a range of 200kHz to 1MHz. Applications requiring fixed 1.5MHz operation should use the MP28115DQ-LF-Z. The SC174MLTRT's lower maximum frequency may reduce EMI in some applications but may require larger output filter components.

Q: Are there temperature rating differences?

A: Yes. The MP28115DQ-LF-Z is rated for -40°C to 85°C ambient temperature (TA), while the SC174MLTRT is rated for -40°C to 125°C junction temperature (TJ). The SC174MLTRT provides higher thermal headroom for elevated-temperature environments.

Q: Do both parts meet current RoHS standards?

A: The MP28115DQ-LF-Z is ROHS3 Compliant. The SC174MLTRT is RoHS Compliant. Both meet RoHS requirements for new applications. Verify specific RoHS revision requirements for your application or region.

Q: What is the output current capability of both parts?

A: Both the MP28115DQ-LF-Z and SC174MLTRT deliver 4A continuous output current with synchronous rectification for efficiency.

Q: Are these parts suitable for new designs?

A: Both parts are marked as Not For New Designs by their respective manufacturers. For new product development, consult the manufacturers' current product lines for recommended alternatives with active production status.