LYT2004K-TL Equivalent & Substitute Parts

Part Overview

The LYT2004K-TL is an offline switch flyback converter IC manufactured by Power Integrations, operating in the LYTSwitch™-2 series. This isolated power management IC is designed for flyback topology applications with a 10W power rating and 85kHz switching frequency. The device is Active status and RoHS Compliant, suitable for offline power supply designs requiring galvanic isolation.

Substitute parts are identified based on matching functional topology (offline switcher architecture), isolation characteristics, and surface mount packaging compatibility. The following equivalent components maintain core operational parameters while offering alternative sourcing options.

Substiute Parts

LYT2004K-TL

Power IntegrationsIn Stock: 4456LYT2004K-TL Datasheet

Current PartRFQ

AL1677-05BS-13

Diodes IncorporatedIn Stock: 25236AL1677-05BS-13 Datasheet

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MP4026GJ-P

Monolithic Power SystemsIn Stock: 1295MP4026GJ-P Datasheet

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MP4068GS-Z

Monolithic Power Systems Inc.In Stock: 276717MP4068GS-Z Datasheet

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NCL30088DDR2G

onsemiIn Stock: 5107NCL30088DDR2G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LYT2004K-TL are grouped based on the following substitution criteria:

Primary Matching Parameters:

• Topology: Flyback (isolated converter architecture)
• Type: AC DC Offline Switcher
• Internal Switch Configuration: Presence of integrated switching element
• Mounting Type: Surface Mount
• Product Status: Active
• Compliance: RoHS Status and REACH Unaffected

Substitution Logic: Parts MP4026GJ-P and NCL30088DDR2G share the Flyback topology with the main part, maintaining isolated output architecture. These components are suitable for applications requiring galvanic isolation and offline switching operation. MP4068GS-Z and AL1677-05BS-13 represent alternative offline switcher topologies (Buck/Boost and Buck respectively) and are listed as cross-references but operate under different electrical parameters.

All substitute parts maintain Active product status and RoHS compliance, ensuring long-term availability and regulatory alignment with the main part.

Parameter Comparison

Engineering Selection Recommendations

Flyback Topology Substitutes (Direct Functional Equivalents):

MP4026GJ-P and NCL30088DDR2G maintain Flyback topology architecture, providing the closest functional equivalence to LYT2004K-TL. Both parts are Active status with ROHS3 compliance and REACH Unaffected designation. MP4026GJ-P operates at maximum junction temperature of 125°C, while NCL30088DDR2G supports -40°C to 125°C ambient temperature range. Package differences (TSOT-23-6 and 8-SOIC respectively) require PCB layout modification.

Alternative Topology Substitutes (Cross-Reference Only):

MP4068GS-Z employs Buck/Boost topology with Triac dimming capability, suitable for lighting applications but not functionally equivalent for isolated flyback converter designs. AL1677-05BS-13 uses Buck topology with fixed 500mA output current, applicable only to specific LED driver applications.

Compliance and Availability:

All substitute parts maintain Active product status and regulatory compliance (RoHS3, REACH Unaffected, EAR99 ECCN classification). Selection should prioritize topology alignment with application requirements and package compatibility with existing PCB designs.

Frequently Asked Questions (FAQ)

Q: Can MP4026GJ-P directly replace LYT2004K-TL in a flyback converter design?

A: MP4026GJ-P shares Flyback topology with LYT2004K-TL but differs in package (TSOT-23-6 vs. 12-BESOP), internal switch configuration (No vs. Yes), and operating temperature maximum (125°C vs. 150°C). PCB layout redesign is required. Verify voltage supply range compatibility (9.8V-27V for MP4026GJ-P) with your application.

Q: What is the key difference between LYT2004K-TL and NCL30088DDR2G?

A: Both use Flyback topology for isolated offline switching. NCL30088DDR2G operates with external switching element (Internal Switch: No), while LYT2004K-TL integrates the switch internally. Package differs (8-SOIC vs. 12-BESOP). Voltage supply range for NCL30088DDR2G is 8.8V-20V.

Q: Why are MP4068GS-Z and AL1677-05BS-13 listed as substitutes if they use different topologies?

A: These parts are listed as cross-references based on the provided substitute data. MP4068GS-Z uses Buck/Boost topology (not Flyback), and AL1677-05BS-13 uses Buck topology. They are not functionally equivalent for isolated flyback applications and should not be selected as direct replacements without comprehensive circuit redesign.

Q: Are all substitute parts RoHS compliant?

A: Yes. LYT2004K-TL is RoHS Compliant. All substitute parts (MP4026GJ-P, NCL30088DDR2G, MP4068GS-Z, AL1677-05BS-13) are ROHS3 Compliant and REACH Unaffected, meeting current regulatory requirements.

Q: What packaging considerations apply when selecting a substitute?

A: LYT2004K-TL uses 12-BESOP (0.350", 8.89mm width) with 11 leads and exposed pad. MP4026GJ-P uses TSOT-23-6 (6 leads), NCL30088DDR2G uses 8-SOIC (8 leads), and MP4068GS-Z uses 8-SOIC-7A (7 leads). Package differences require PCB footprint redesign and may affect thermal management due to exposed pad availability.

Q: What is the operating temperature range consideration for substitution?

A: LYT2004K-TL operates -40°C to 150°C (junction temperature). MP4026GJ-P maximum is 125°C (junction). NCL30088DDR2G operates -40°C to 125°C (ambient). Applications requiring full -40°C to 150°C range may not be compatible with MP4026GJ-P or NCL30088DDR2G without thermal management modifications.