MP4021GS-LF-Z LED Driver IC Equivalent & Substitute Parts

Part Overview

The MP4021GS-LF-Z is an AC DC offline switcher LED driver IC manufactured by Monolithic Power Systems Inc., designed for lighting applications with a single output and flyback topology. This part is classified as "Not For New Designs," indicating it has been superseded in the manufacturer's product line. Organizations requiring this component for legacy system support, maintenance, or replacement applications must evaluate qualified substitute parts that maintain functional and electrical compatibility within the specified parameter ranges.

Substiute Parts

MP4021GS-LF-Z

Monolithic Power Systems Inc.In Stock: 63802MP4021GS-LF-Z Datasheet

Current PartRFQ

MP4021AGS-Z

Monolithic Power Systems Inc.In Stock: 776MP4021AGS-Z Datasheet

MFR RecommendedRFQ

AL9910S-13

Diodes IncorporatedIn Stock: 13831AL9910S-13 Datasheet

MFR RecommendedRFQ

LM3444MA/NOPB

National SemiconductorIn Stock: 2384LM3444MA/NOPB Datasheet

MFR RecommendedRFQ

TS19450CS RLG

Taiwan Semiconductor CorporationIn Stock: 1218TS19450CS RLG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MP4021GS-LF-Z is determined by the following critical parameters:

• Package Compatibility: All substitute parts must use the 8-SOIC package format (0.154", 3.90mm Width) to ensure mechanical and electrical pin compatibility with existing PCB layouts.
• Voltage Supply Range: Substitute parts must operate within or encompass the 10.3V to 23V supply voltage range of the original part.
• Topology & Type: Parts must function as AC DC offline switchers suitable for LED driver applications.
• Number of Outputs: Single output configuration required.
• Operating Temperature Range: Substitute parts must support the -40°C to 125°C operating temperature specification.
• Regulatory Compliance: RoHS3 compliance and REACH unaffected status required for equivalent substitution.

The substitute parts listed below meet these core substitution criteria with varying degrees of functional overlap in topology, dimming capability, and frequency range.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: MP4021AGS-Z

The MP4021AGS-Z is the direct equivalent substitute for the MP4021GS-LF-Z. Both parts share identical electrical specifications (10.3V to 23V supply range, -40°C to 125°C operating temperature), the same flyback topology, and equivalent packaging (8-SOIC). The MP4021AGS-Z maintains Active product status, ensuring ongoing availability and manufacturer support. This part is the preferred choice for direct replacement applications.

Secondary Recommendations: AL9910S-13, LM3444MA/NOPB, TS19450CS RLG

These parts provide functional substitution with topology and supply voltage variations:

• AL9910S-13 (Diodes Incorporated): Offers extended supply voltage range (15V to 500V) with buck-boost topology and dual dimming modes (Analog, PWM). Active product status ensures availability. Operating temperature is limited to -40°C to 85°C, which is below the original specification. Suitable for applications where extended input voltage range is required.

• LM3444MA/NOPB (National Semiconductor): Provides buck topology with analog dimming and matches the -40°C to 125°C operating temperature range. Supply voltage range (8V to 13V) is narrower than the original part. Active product status confirmed. Suitable for applications within the specified voltage window.

• TS19450CS RLG (Taiwan Semiconductor Corporation): Offers buck topology with dual dimming modes and extended supply voltage range (8V to 450V). Operating temperature extends to 150°C. Product status is Obsolete, indicating discontinued manufacturing and potential supply constraints. Use only when other alternatives are unavailable.

Frequently Asked Questions (FAQ)

Q: Can MP4021AGS-Z directly replace MP4021GS-LF-Z without PCB modifications?

A: Yes. Both parts use identical 8-SOIC packaging, pin configuration, and electrical specifications (10.3V to 23V supply, -40°C to 125°C operating temperature). Direct pin-for-pin substitution is supported without PCB layout changes.

Q: What is the primary difference between MP4021GS-LF-Z and MP4021AGS-Z?

A: The MP4021AGS-Z is the active production equivalent. The MP4021GS-LF-Z is marked "Not For New Designs," indicating it has been superseded. Electrical and functional specifications are identical.

Q: Why does AL9910S-13 have a lower maximum operating temperature (-40°C to 85°C) than the original part?

A: AL9910S-13 specifies operating temperature as TA (ambient temperature) rather than TJ (junction temperature). This represents a different measurement methodology. Applications requiring junction temperature specifications above 85°C should verify thermal performance through detailed datasheets.

Q: Can LM3444MA/NOPB be used in applications requiring supply voltages above 13V?

A: No. LM3444MA/NOPB maximum supply voltage is 13V, which is below the original part's 23V maximum. This part is suitable only for applications operating within the 8V to 13V range.

Q: Is TS19450CS RLG recommended for new designs?

A: No. TS19450CS RLG is classified as Obsolete, indicating discontinued manufacturing. This part should be used only for legacy system maintenance or when other substitutes are unavailable. Long-term supply availability cannot be guaranteed.

Q: What packaging considerations apply to all substitute parts?

A: All substitute parts use 8-SOIC (0.154", 3.90mm Width) surface mount packaging, ensuring mechanical compatibility with existing PCB designs. Verify supplier device package designations (8-SOIC, 8-SO, 8-SOP) match your assembly equipment specifications.

Q: Are all substitute parts RoHS3 compliant?

A: MP4021AGS-Z, AL9910S-13, and TS19450CS RLG are confirmed ROHS3 compliant. LM3444MA/NOPB RoHS status is not specified in available documentation. Verify compliance requirements with your procurement or quality assurance department before selection.

Q: What is the significance of Moisture Sensitivity Level (MSL) differences?

A: MSL ratings indicate storage and handling requirements. MP4021AGS-Z (MSL 2, 1 Year) and AL9910S-13 (MSL 1, Unlimited) have less stringent moisture control requirements than TS19450CS RLG (MSL 3, 168 Hours). Higher MSL ratings require more careful storage and shorter shelf life windows.