MP4050GS-Z Equivalent & Substitute Parts

Part Overview

The MP4050GS-Z is an AC DC offline switcher LED driver IC manufactured by Monolithic Power Systems Inc., designed for lighting applications with a step-down (buck) topology and internal switching capability. This device operates across a wide AC input range of 85VAC to 265VAC and is packaged in an 8-SOIC form factor. The part is classified as "Not For New Designs," indicating it has reached end-of-life status. Engineers requiring this functionality must evaluate active substitute parts that maintain compatibility with existing designs or provide equivalent performance characteristics for new implementations.

Substiute Parts

MP4050GS-Z

Monolithic Power Systems Inc.In Stock: 122744MP4050GS-Z Datasheet

Current PartRFQ

AL1692-20CS7-13

Diodes IncorporatedIn Stock: 2842AL1692-20CS7-13 Datasheet

MFR RecommendedRFQ

AP1685MTR-G1

Diodes IncorporatedIn Stock: 40399AP1685MTR-G1 Datasheet

MFR RecommendedRFQ

LM3447MT/NOPB

Texas InstrumentsIn Stock: 2946LM3447MT/NOPB Datasheet

MFR RecommendedRFQ

LYT3328D-TL

Power IntegrationsIn Stock: 55346LYT3328D-TL Datasheet

MFR RecommendedRFQ

LYT7503D-TL

Power IntegrationsIn Stock: 9695LYT7503D-TL Datasheet

MFR RecommendedRFQ

TS19451CY RMG

Taiwan Semiconductor CorporationIn Stock: 1065TS19451CY RMG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MP4050GS-Z is determined by the following critical parameters:

Primary Compatibility Criteria:

• AC DC offline switcher topology with step-down (buck) configuration
• Single output channel
• Internal switching capability
• Surface mount packaging compatible with 8-SOIC footprint or equivalent
• Operating temperature range supporting -40°C to 125°C minimum
• AC input voltage range of 85VAC to 265VAC or compatible DC supply voltage

Substitutes are grouped into two categories:

1. Direct AC Input Substitutes (LYT7503D-TL, LYT3328D-TL): Parts accepting 85VAC–308VAC input, maintaining the original AC offline switcher architecture with step-down topology and internal switching.

2. DC Input Substitutes (AL1692-20CS7-13, AP1685MTR-G1, LM3447MT/NOPB, TS19451CY RMG): Parts with DC supply voltage inputs (7.5V–400V range) that provide equivalent LED driver functionality but require different input conditioning. These are suitable for designs where AC input conversion is handled externally or where DC supply is available.

All substitute parts maintain ROHS3 compliance and are suitable for lighting applications.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (AC Input Preservation):

LYT7503D-TL is the closest functional equivalent, maintaining 8-SOIC packaging, step-down topology, internal switching, and AC input voltage range (90VAC–308VAC). However, this part is classified as "Not For New Designs." For new designs requiring AC offline switching with step-down topology, LYT3328D-TL provides active product status with extended temperature range (-40°C to 150°C) and flexible topology support (Flyback, Buck, Boost), though it requires 16-SOIC packaging and operates at a narrower AC input range (85VAC–132VAC).

For DC Supply Implementations:

AL1692-20CS7-13 and AP1685MTR-G1 are active alternatives suitable for designs with DC supply inputs. AL1692-20CS7-13 offers multi-topology support (Flyback, Buck, Boost) with 2A output capability and triac dimming. AP1685MTR-G1 provides 2.5A output with step-down topology and is available in higher inventory quantities (40,300 pcs). Both operate at reduced DC voltage ranges (8–25V) compared to the original AC input specification.

For Specialized Applications:

LM3447MT/NOPB (Texas Instruments, Active) supports flyback topology with triac dimming and extended temperature range matching the original part (-40°C to 125°C). TS19451CY RMG (Taiwan Semiconductor, Active) is suitable for low-current applications (50mA) with the widest DC supply voltage range (20V–400V).

Compliance Considerations:

All substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the original part's regulatory requirements. Parts with active product status (LYT3328D-TL, AL1692-20CS7-13, AP1685MTR-G1, LM3447MT/NOPB, TS19451CY RMG) are recommended for new designs.

Frequently Asked Questions (FAQ)

Q: Can LYT7503D-TL directly replace MP4050GS-Z in existing designs?

A: LYT7503D-TL maintains identical 8-SOIC packaging, step-down topology, internal switching, and compatible AC input voltage range (90VAC–308VAC). Pin-level compatibility must be verified against schematic documentation. However, both parts are classified as "Not For New Designs," indicating potential long-term availability constraints.

Q: Why do some substitutes require DC input instead of AC input?

A: AL1692-20CS7-13, AP1685MTR-G1, LM3447MT/NOPB, and TS19451CY RMG are designed for DC supply applications where AC-to-DC conversion is handled by external circuitry or where the power source is already rectified. These parts offer active product status and higher inventory availability but require different input conditioning compared to the original AC offline switcher architecture.

Q: What is the impact of package differences on substitution?

A: Package differences (8-SOIC vs. 7-SO vs. 16-SOIC vs. 14-TSSOP vs. SOT-89) require PCB layout modifications and cannot be considered drop-in replacements. Footprint compatibility must be evaluated during design phase. Smaller packages (7-SO, SOT-89) may offer space advantages but require layout redesign. Larger packages (16-SOIC, 14-TSSOP) may provide additional functionality but increase board area requirements.

Q: Which substitute is recommended for new lighting designs?

A: LYT3328D-TL is recommended for new AC offline switcher designs requiring step-down topology with active product status. It maintains AC input voltage compatibility (85VAC–132VAC), supports extended temperature range (-40°C to 150°C), and offers flexible topology options (Flyback, Buck, Boost). Design validation is required due to 16-SOIC packaging and different pin configuration compared to MP4050GS-Z.

Q: Are all substitutes ROHS3 compliant?

A: Yes, all listed substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the regulatory requirements of the original MP4050GS-Z.

Q: What is the difference between triac dimming and standard dimming?

A: Triac dimming capability (present in LYT7503D-TL, LYT3328D-TL, AL1692-20CS7-13, and LM3447MT/NOPB) enables phase-cut dimming control compatible with standard wall dimmers. Parts without specified dimming capability (AP1685MTR-G1, TS19451CY RMG) may require alternative dimming control methods or external dimming circuits.

Q: Can TS19451CY RMG substitute for MP4050GS-Z?

A: TS19451CY RMG is suitable only for low-current lighting applications (50mA maximum output). It requires DC supply input (20V–400V) and operates at reduced temperature range (-40°C to 85°C). This part is not recommended as a general replacement but may be appropriate for specific low-power LED backlight or indicator lighting applications.