MP6900DS-LF Equivalent & Substitute Parts

Part Overview

The MP6900DS-LF is an active secondary-side controller IC manufactured by Monolithic Power Systems Inc., designed for power supply applications requiring synchronized rectification control. This 8-SOIC surface mount device operates across a 8V to 24V supply voltage range and delivers 3 mA supply current, making it suitable for isolated power conversion topologies. The part maintains Active product status with full RoHS3 compliance and REACH unaffected certification, ensuring regulatory compliance for industrial and consumer applications.

Substitute parts become necessary when the primary component experiences extended lead times, inventory constraints, or when design flexibility permits functional equivalents that meet or exceed the original specifications.

Substiute Parts

MP6900DS-LF

Monolithic Power Systems Inc.In Stock: 681MP6900DS-LF Datasheet

Current PartRFQ

TEA1791AT/N1,118

NXP USA Inc.In Stock: 2038TEA1791AT/N1,118 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MP6900DS-LF is determined by the following critical parameters:

Package Compatibility: Both the main part and substitute must use the 8-SOIC (0.154", 3.90mm Width) surface mount package to ensure PCB footprint compatibility without layout redesign.

Functional Classification: All candidates must operate as secondary-side controllers within isolated power supply topologies, maintaining the same functional role in power conversion circuits.

Supply Voltage Range: The substitute must accommodate the operational supply voltage window. The MP6900DS-LF operates from 8V to 24V; substitutes with extended ranges (such as 8.5V to 38V) remain compatible as they encompass the original specification.

Surface Mount Technology: All parts must be surface mount devices suitable for automated assembly processes.

Regulatory Compliance: RoHS3 compliance and REACH unaffected status are mandatory for equivalent substitution in regulated markets.

The TEA1791AT/N1,118 from NXP USA Inc. satisfies all substitution criteria, offering extended supply voltage range (8.5V ~ 38V), superior operating temperature range (-40°C ~ 150°C), and improved moisture sensitivity rating (MSL 1 vs. MSL 2).

Parameter Comparison

Engineering Selection Recommendations

Both the MP6900DS-LF and TEA1791AT/N1,118 maintain Active product status with full RoHS3 compliance and REACH unaffected certification, ensuring regulatory alignment for current and future applications.

The TEA1791AT/N1,118 provides extended operational margins: the supply voltage range of 8.5V to 38V encompasses the MP6900DS-LF specification while offering additional headroom for higher-voltage isolated topologies. The operating temperature range extends to 150°C, providing thermal margin for demanding environments. The MSL 1 rating with unlimited shelf life eliminates moisture sensitivity constraints compared to the MSL 2 rating of the original part.

Supply current consumption differs significantly: the MP6900DS-LF draws 3 mA while the TEA1791AT/N1,118 draws 950 µA. This lower quiescent current in the substitute may reduce overall system power dissipation in standby or light-load conditions.

Selection between these parts should be based on application-specific requirements: the MP6900DS-LF remains the preferred choice for designs already qualified and in production, while the TEA1791AT/N1,118 offers enhanced specifications for new designs or applications requiring extended voltage or temperature ranges.

Frequently Asked Questions (FAQ)

Q: Can the TEA1791AT/N1,118 directly replace the MP6900DS-LF without PCB modifications?

A: Yes. Both parts use identical 8-SOIC (0.154", 3.90mm Width) packaging, ensuring footprint compatibility. No PCB layout changes are required for mechanical and electrical connection.

Q: What are the key differences in electrical specifications?

A: The TEA1791AT/N1,118 extends the supply voltage range from 8V–24V to 8.5V–38V, operates across -40°C to 150°C (versus -40°C to 125°C), and consumes 950 µA supply current compared to 3 mA. The substitute also provides MSL 1 moisture sensitivity versus MSL 2.

Q: Does the lower supply current of the TEA1791AT/N1,118 affect circuit performance?

A: Supply current specifications define quiescent power consumption of the controller IC itself. The 950 µA rating of the substitute is substantially lower than the 3 mA of the original, potentially reducing standby power dissipation. Functional performance in active control operation is determined by other IC parameters not specified in this comparison.

Q: Are both parts suitable for high-temperature applications?

A: The MP6900DS-LF operates to 125°C maximum. The TEA1791AT/N1,118 extends this to 150°C, making it suitable for applications requiring higher thermal margins or operation in elevated ambient conditions.

Q: What is the significance of MSL rating differences?

A: MSL 2 (1 Year) indicates the MP6900DS-LF requires controlled moisture exposure with a 1-year shelf life limit. MSL 1 (Unlimited) for the TEA1791AT/N1,118 eliminates moisture sensitivity constraints and provides indefinite shelf life, reducing storage and handling requirements.

Q: Are both parts RoHS3 compliant?

A: Yes. Both the MP6900DS-LF and TEA1791AT/N1,118 carry RoHS3 compliance and REACH unaffected certification, meeting regulatory requirements for EU and global markets.