MP28127DQ-LF-P Equivalent & Substitute Parts

Part Overview

The MP28127DQ-LF-P is a buck switching regulator IC from Monolithic Power Systems Inc., designed for positive adjustable step-down voltage regulation with 1.25A output current capability. This component operates across a 2.7V to 5.5V input range and delivers adjustable output voltage from 0.8V to 4.95V. The device is marked as "Not For New Designs," indicating it has reached end-of-life status. Identifying suitable substitute parts is necessary for ongoing production support, legacy system maintenance, and design continuity where this regulator is currently deployed.

Substiute Parts

MP28127DQ-LF-P

Monolithic Power Systems Inc.In Stock: 1196MP28127DQ-LF-P Datasheet

Current PartRFQ

MP2128DG-LF-Z

Monolithic Power SystemsIn Stock: 2543MP2128DG-LF-Z Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MP28127DQ-LF-P is determined by the following critical parameters:

• Topology & Function: Buck switching regulator with positive adjustable output
• Output Current Capability: Minimum 1.25A required for direct substitution
• Input Voltage Range: Must accommodate 2.7V to 5.5V operation
• Output Voltage Adjustability: Must support 0.8V minimum output voltage
• Package Compatibility: Surface mount QFN package with exposed pad
• Regulatory Compliance: ROHS3 compliance and MSL rating

The MP2128DG-LF-Z qualifies as a manufacturer-recommended substitute. While it operates at a higher switching frequency (2.8MHz vs. 1.5MHz) and has a lower output current rating (1A vs. 1.25A), it maintains functional equivalence for applications where the 1A output current is sufficient. The substitute supports a wider input voltage range (2.5V to 6V) and lower minimum output voltage (0.6V), providing greater design flexibility. Both devices employ synchronous rectification, operate across the same temperature range, and maintain identical compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The MP2128DG-LF-Z is the manufacturer-recommended substitute for the MP28127DQ-LF-P. Selection of this substitute is appropriate when:

• Output current requirements do not exceed 1A
• The application can accommodate a smaller package footprint (8-QFN 2x2 vs. 10-QFN 3x3)
• Higher switching frequency (2.8MHz) is acceptable or beneficial for reduced inductor size
• Extended input voltage range (2.5V to 6V) provides design margin
• Lower minimum output voltage (0.6V) meets or exceeds application requirements

Both devices maintain identical compliance certifications (ROHS3, MSL 1) and operating temperature ranges (-40°C to 85°C). The substitute's active product status ensures long-term availability and continued manufacturer support, whereas the main part is end-of-life. For applications requiring the full 1.25A output current, alternative parts from the same manufacturer should be evaluated.

Frequently Asked Questions (FAQ)

Q: Can the MP2128DG-LF-Z directly replace the MP28127DQ-LF-P without circuit modifications?

A: Direct replacement requires evaluation of output current requirements. The MP2128DG-LF-Z is rated for 1A maximum output current versus 1.25A for the MP28127DQ-LF-P. If your application draws less than 1A, substitution is feasible. The smaller package (8-QFN 2x2) requires PCB layout adjustment. Feedback network resistor values may require recalculation due to different minimum output voltage specifications (0.6V vs. 0.8V).

Q: What are the package compatibility considerations?

A: The MP28127DQ-LF-P uses a 10-VFDFN package (10-QFN 3x3), while the MP2128DG-LF-Z uses an 8-TFDFN package (8-QFN 2x2). These are physically different footprints requiring PCB redesign. The substitute has fewer pins and a smaller die size, which may reduce board space but necessitates layout rework.

Q: How does the higher switching frequency of the MP2128DG-LF-Z affect circuit design?

A: The substitute operates at 2.8MHz compared to 1.5MHz for the main part. Higher switching frequency allows use of smaller inductors and output capacitors, reducing overall solution size. However, this may increase switching losses and EMI considerations. Inductor selection and PCB layout must be re-evaluated for the substitute design.

Q: Are both parts equally available for procurement?

A: The MP28127DQ-LF-P is end-of-life (Not For New Designs status) with limited remaining inventory. The MP2128DG-LF-Z is an active product with established supply channels and long-term availability assurance from Monolithic Power Systems.

Q: What compliance certifications apply to both parts?

A: Both the MP28127DQ-LF-P and MP2128DG-LF-Z are ROHS3 compliant, REACH unaffected, and carry MSL rating 1 (unlimited moisture sensitivity level). Both are classified under ECCN EAR99 and HTSUS code 8542.39.0001.