LYT2005K Equivalent & Substitute Parts

Part Overview

The LYT2005K is an offline switch flyback converter IC manufactured by Power Integrations, designed for isolated power management applications. This device operates at 85kHz switching frequency with 12W power output and features a 725V breakdown voltage rating. The LYT2005K is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design requirements and component procurement.

Substiute Parts

LYT2005K

Power IntegrationsIn Stock: 3598LYT2005K Datasheet

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MP4088GN

Monolithic Power Systems Inc.In Stock: 834MP4088GN Datasheet

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RT7304GE

Richtek USA Inc.In Stock: 23510RT7304GE Datasheet

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TPS92310DGS/NOPB

Texas InstrumentsIn Stock: 1277TPS92310DGS/NOPB Datasheet

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TPS92314DR/NOPB

Texas InstrumentsIn Stock: 25273TPS92314DR/NOPB Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the LYT2005K is determined by the following critical parameters:

Primary Substitution Criteria:

• Topology: Flyback converter architecture
• Output Isolation: Isolated power delivery
• Internal Switch Integration: Integrated switching element
• Voltage Rating: Breakdown voltage capability ≥725V
• Power Output: 12W nominal rating
• Switching Frequency: 85kHz operation
• Package Compatibility: Surface mount configuration

Secondary Compatibility Factors:

• Operating temperature range: -40°C to 150°C minimum
• RoHS and REACH compliance status
• Moisture sensitivity classification
• Lead count and physical dimensions

The substitute parts identified (TPS92314DR/NOPB, TPS92310DGS/NOPB, and RT7304GE) share the flyback topology and isolated output characteristics. However, variations exist in switching frequency, package form factor, internal switch configuration, and voltage supply ranges. These differences require evaluation against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

TPS92314DR/NOPB (Texas Instruments)

The TPS92314DR/NOPB is an active product with flyback topology and external switch configuration. This device operates within the 60kHz to 150kHz frequency range, encompassing the LYT2005K's 85kHz specification. The 8-SOIC package differs from the 12-BESOP form factor of the original part. Supply voltage range is 13V to 35V. MSL rating of 1 (Unlimited) provides superior moisture handling compared to the LYT2005K. This substitute is suitable for applications where external switch integration is acceptable and PCB layout can accommodate the smaller package footprint.

TPS92310DGS/NOPB (Texas Instruments)

The TPS92310DGS/NOPB operates as an active flyback converter with external switch architecture. Switching frequency range of 60kHz to 150kHz includes the 85kHz operating point. The 10-VSSOP package represents a different form factor requiring PCB redesign. Supply voltage specification of 13V to 36V differs from the LYT2005K. MSL rating of 1 (Unlimited) exceeds moisture protection requirements. This option is applicable where package miniaturization and enhanced moisture resistance are design priorities.

RT7304GE (Richtek USA Inc.)

The RT7304GE is an active product supporting multiple topologies including flyback, buck, and boost configurations. External switch design requires additional discrete switching element integration. The SOT-23-6 package is significantly smaller than the 12-BESOP, necessitating substantial PCB layout modification. Supply voltage range of 12V to 25V is narrower than typical offline converter requirements. MSL rating of 3 (168 Hours) matches the LYT2005K specification. This substitute is appropriate for applications with constrained board space and lower voltage supply requirements.

MP4088GN (Monolithic Power Systems Inc.)

The MP4088GN features integrated switch architecture with buck and boost topology support. Operating frequency of 22kHz is significantly lower than the LYT2005K's 85kHz specification. The 8-SOIC package requires PCB redesign. Supply voltage range of 4.5V to 5V is incompatible with typical offline converter input specifications. MSL rating of 2A (4 Weeks) provides intermediate moisture protection. This device is not recommended as a direct substitute due to fundamental topology and frequency differences.

Compliance and Certification Status

All identified substitute parts maintain RoHS3 compliance and REACH Unaffected status, consistent with the LYT2005K. All devices are classified under ECCN EAR99. Moisture sensitivity levels vary, with Texas Instruments devices offering superior MSL ratings (1 - Unlimited) compared to the original part (3 - 168 Hours).

Frequently Asked Questions (FAQ)

Q: Can the TPS92314DR/NOPB directly replace the LYT2005K without circuit modification?

A: No. The TPS92314DR/NOPB requires external switch integration, whereas the LYT2005K includes an internal switch. Additionally, the package form factor differs (8-SOIC versus 12-BESOP), requiring PCB layout redesign. Circuit topology modifications are necessary to accommodate the external switch architecture.

Q: What is the primary difference between the LYT2005K and substitute parts regarding internal switch configuration?

A: The LYT2005K integrates the switching element internally, simplifying circuit design and reducing component count. The TPS92314DR/NOPB and TPS92310DGS/NOPB require external discrete switching elements, increasing design complexity but providing greater flexibility in switch selection and power rating customization.

Q: How do switching frequency differences affect substitution compatibility?

A: The LYT2005K operates at 85kHz. The TPS92314DR/NOPB and TPS92310DGS/NOPB support 60kHz to 150kHz ranges, encompassing the original frequency. The MP4088GN operates at 22kHz, which is incompatible with the LYT2005K's frequency specification and transformer design requirements. Frequency changes affect transformer core selection, winding design, and EMI characteristics.

Q: Are package differences significant for substitution?

A: Yes. The LYT2005K uses 12-BESOP packaging, while substitutes employ 8-SOIC, 10-VSSOP, or SOT-23-6 packages. Different package footprints require PCB layout redesign, including trace routing, thermal management considerations, and component placement modifications. Pin assignments may differ, necessitating schematic review.

Q: What does MSL rating indicate, and why do substitute parts show different values?

A: Moisture Sensitivity Level (MSL) specifies the maximum time a component can be stored at specified humidity before soldering. The LYT2005K has MSL 3 (168 hours), while Texas Instruments substitutes have MSL 1 (Unlimited). Lower MSL values indicate superior moisture resistance and longer shelf life without special storage requirements.

Q: Is the RT7304GE suitable for offline converter applications?

A: The RT7304GE supports flyback topology but operates with external switch configuration and a narrower supply voltage range (12V to 25V). For true offline converter applications requiring higher input voltage tolerance, this device has limited applicability. Its smaller SOT-23-6 package and multi-topology support make it suitable for specific low-voltage applications.

Q: Do all substitute parts maintain the same compliance certifications as the LYT2005K?

A: Yes. All identified substitutes are RoHS3 compliant, REACH Unaffected, and classified as ECCN EAR99, matching the LYT2005K's regulatory status. However, individual product datasheets should be reviewed for specific regional compliance requirements and application-specific certifications.

Q: What is the impact of operating temperature range differences?

A: The LYT2005K operates to 150°C junction temperature, while all substitutes are rated to 125°C maximum. This 25°C difference may affect thermal design margins in high-temperature applications. Applications requiring operation above 125°C junction temperature cannot use the identified substitutes without thermal management redesign.

Q: Can the MP4088GN be used in place of the LYT2005K?

A: No. The MP4088GN is fundamentally incompatible due to: (1) Buck/Boost topology versus Flyback, (2) 22kHz switching frequency versus 85kHz, (3) 4.5V to 5V supply range versus offline converter requirements, and (4) integrated switch with different control architecture. This device is designed for LED driver applications, not general offline power conversion.