MPQ2128DG-AEC1-LF-Z Equivalent & Substitute Parts

Part Overview

The MPQ2128DG-AEC1-LF-Z is a buck switching regulator IC from Monolithic Power Systems Inc., designed for step-down voltage conversion with positive adjustable output. This automotive-grade component (AEC-Q100 qualified) delivers 1A output current with a switching frequency of 2.8MHz and supports input voltages from 2.5V to 6V with adjustable output from 0.6V to 6V.

The MPQ2128DG-AEC1-LF-Z carries a "Not For New Designs" product status, making it necessary to identify equivalent alternatives for ongoing production and new design implementations. The substitute part MP2128DG-LF-Z provides functional equivalence while maintaining active product status.

Key Parameters

Parameter	Value
Function	Step-Down (Buck)
Output Configuration	Positive
Output Type	Adjustable
Number of Outputs	1
Voltage - Input (Min)	2.5V
Voltage - Input (Max)	6V
Voltage - Output (Min/Fixed)	0.6V
Voltage - Output (Max)	6V
Current - Output	1A
Frequency - Switching	2.8MHz
Synchronous Rectifier	Yes
Package / Case	8-TFDFN Exposed Pad
Supplier Device Package	8-QFN (2x2)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the MPQ2128DG-AEC1-LF-Z is determined by strict alignment of the following critical parameters:

Function and topology (step-down buck converter)
Output configuration (positive adjustable)
Voltage specifications (input 2.5V–6V, output 0.6V–6V)
Current rating (1A output)
Switching frequency (2.8MHz)
Package type (8-TFDFN Exposed Pad / 8-QFN 2x2)
Synchronous rectifier capability (yes)
Surface mount compatibility

The MP2128DG-LF-Z meets all these criteria and is classified as the manufacturer-recommended substitute. Both parts share the same base product number (MP2128) and are manufactured by Monolithic Power Systems Inc.

Parameter Comparison

Parameter	MPQ2128DG-AEC1-LF-Z	MP2128DG-LF-Z
Manufacturer	Monolithic Power Systems Inc.	Monolithic Power Systems
Function	Step-Down	Step-Down
Output Configuration	Positive	Positive
Output Type	Adjustable	Adjustable
Number of Outputs	1	1
Voltage - Input (Min)	2.5V	2.5V
Voltage - Input (Max)	6V	6V
Voltage - Output (Min/Fixed)	0.6V	0.6V
Voltage - Output (Max)	6V	6V
Current - Output	1A	1A
Frequency - Switching	2.8MHz	2.8MHz
Synchronous Rectifier	Yes	Yes
Package / Case	8-TFDFN Exposed Pad	8-TFDFN Exposed Pad
Supplier Device Package	8-QFN (2x2)	8-QFN (2x2)
Mounting Type	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)
Product Status	Not For New Designs	Active
Operating Temperature	-40°C ~ 125°C (TJ)	-40°C ~ 85°C (TA)
Grade	Automotive	Not specified
Qualification	AEC-Q100	Not specified

Engineering Selection Recommendations

The MP2128DG-LF-Z is the direct substitute for the MPQ2128DG-AEC1-LF-Z based on electrical and mechanical parameter equivalence. The primary distinction is product lifecycle status: the original part is designated "Not For New Designs," while the substitute maintains active product status, ensuring long-term availability and supply chain continuity.

The MPQ2128DG-AEC1-LF-Z carries automotive-grade qualification (AEC-Q100) with a junction temperature rating of -40°C to 125°C. The MP2128DG-LF-Z specifies an ambient temperature range of -40°C to 85°C without explicit automotive qualification documentation in the provided parameters. For applications requiring automotive-grade certification or extended temperature operation to 125°C, compliance verification against specific application requirements is necessary.

Both parts are ROHS3 compliant, REACH unaffected, and carry MSL 1 (unlimited moisture sensitivity level), supporting standard handling and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can MP2128DG-LF-Z directly replace MPQ2128DG-AEC1-LF-Z in existing designs?

A: Yes. Both parts share identical electrical specifications (input voltage 2.5V–6V, output 0.6V–6V adjustable, 1A current, 2.8MHz switching frequency) and the same package type (8-TFDFN Exposed Pad). The pinout and functional behavior are equivalent. However, the original part specifies automotive-grade qualification (AEC-Q100) with extended temperature range (-40°C to 125°C junction), while the substitute specifies -40°C to 85°C ambient temperature without explicit automotive qualification in the provided data.

Q: What is the key difference between these two parts?

A: The MPQ2128DG-AEC1-LF-Z is marked "Not For New Designs" and carries AEC-Q100 automotive qualification. The MP2128DG-LF-Z is an active product with no automotive qualification designation in the provided parameters. Both are functionally and electrically identical across all specified parameters.

Q: Are the packages physically compatible?

A: Yes. Both parts use the 8-TFDFN Exposed Pad package (8-QFN 2x2 supplier package). PCB footprints, solder pad layouts, and mounting requirements are identical, enabling direct board-level substitution without layout modifications.

Q: What compliance certifications apply to each part?

A: Both parts are ROHS3 compliant and REACH unaffected. The MPQ2128DG-AEC1-LF-Z carries AEC-Q100 automotive qualification. The MP2128DG-LF-Z does not list automotive qualification in the provided parameters.

Q: Are there inventory or lead time considerations?

A: The MPQ2128DG-AEC1-LF-Z has 20,400 pieces in stock. The MP2128DG-LF-Z has 2,438 pieces in stock. Availability may vary by distributor and time of inquiry.

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