LYT2004D Equivalent & Substitute Parts

Part Overview

The LYT2004D is an offline switch flyback converter IC manufactured by Power Integrations, part of the LYTSwitch™-2 series. This integrated circuit operates at 85kHz switching frequency with 8W power output and 725V breakdown voltage, designed for isolated flyback topology applications. The device is packaged in 8-SOIC (SO-8C) surface mount configuration with 7 leads.

The LYT2004D has been discontinued at DiGi Electronics. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this offline switching topology.

Substiute Parts

LYT2004D

Power IntegrationsIn Stock: 42906LYT2004D Datasheet

Current PartRFQ

LYT2005E

Power IntegrationsIn Stock: 4577LYT2005E Datasheet

Parametric EquivalentRFQ

FL7733AMX

onsemiIn Stock: 40232FL7733AMX Datasheet

SimilarRFQ

IRS2982STRPBF

Infineon TechnologiesIn Stock: 5245IRS2982STRPBF Datasheet

SimilarRFQ

MP4026GJ-Z

Monolithic Power Systems Inc.In Stock: 38180MP4026GJ-Z Datasheet

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NCL30000DR2G

onsemiIn Stock: 31670NCL30000DR2G Datasheet

SimilarRFQ

RT7320GSP

Richtek USA Inc.In Stock: 2727RT7320GSP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution logic for the LYT2004D is based on the following critical parameters that define functional equivalence:

Primary Substitution Criteria:

• Topology: Flyback (isolated converter architecture)
• Output Isolation: Isolated
• Internal Switch(s): Yes (integrated power switch)
• Voltage - Breakdown: 725V (maximum voltage rating)
• Frequency - Switching: 85kHz (operating frequency)
• Package / Case: 8-SOIC surface mount configuration
• Operating Temperature Range: -40°C ~ 150°C (TJ)

Parametric Equivalent: The LYT2005E from Power Integrations meets all primary substitution criteria. It shares identical topology, isolation, internal switch configuration, breakdown voltage, switching frequency, package type, and operating temperature range. The primary difference is increased power output (12W versus 8W), which represents an enhancement rather than a limitation for applications designed for the LYT2004D.

Similar Substitutes: The remaining substitute parts (FL7733AMX, IRS2982STRPBF, MP4026GJ-Z, NCL30000DR2G, RT7320GSP) operate on flyback topology with offline switching capability but differ in one or more critical parameters including internal switch configuration, package type, voltage supply ranges, switching frequency, or operating temperature specifications. These parts are classified as similar rather than parametric equivalents due to these variations.

Parameter Comparison

Engineering Selection Recommendations

LYT2005E (Parametric Equivalent - Recommended Primary Substitute)

The LYT2005E is the recommended primary substitute for the LYT2004D. Both devices are manufactured by Power Integrations within the LYTSwitch™-2 series and share identical electrical and mechanical specifications with the exception of power output rating (12W versus 8W). The LYT2005E maintains:

• Identical 725V breakdown voltage
• Identical 85kHz switching frequency
• Identical 55% duty cycle
• Identical -40°C ~ 150°C operating temperature range
• Identical 8-SOIC package configuration
• Active product status with current availability
• RoHS Compliant and MSL 1 (Unlimited) rating

The increased power output of the LYT2005E does not present a limitation for applications designed for the 8W LYT2004D, as the device will operate within the required power envelope.

FL7733AMX (Similar Substitute - onsemi)

The FL7733AMX operates on flyback topology with offline switching capability. This device differs from the LYT2004D in that it lacks an internal switch (No versus Yes), operates with multiple topologies (Flyback, Buck, Step-Up), and has a lower maximum operating temperature (125°C versus 150°C). The FL7733AMX is suitable for applications where the absence of an internal switch is acceptable and thermal requirements do not exceed 125°C. Product status is Active with RoHS3 compliance and MSL 1 rating.

IRS2982STRPBF (Similar Substitute - Infineon Technologies)

The IRS2982STRPBF is an LED driver IC with flyback topology and offline switching capability. This device lacks an internal switch, operates at 320kHz (versus 85kHz), has a narrower operating temperature range (-25°C ~ 125°C), and requires a voltage supply between 11.5V and 18V. This part is suitable only for applications where the higher switching frequency, narrower temperature range, and specific voltage supply requirements are compatible. Product status is Active with RoHS3 compliance and MSL 2 rating.

MP4026GJ-Z (Similar Substitute - Monolithic Power Systems Inc.)

The MP4026GJ-Z is an LED driver IC with flyback topology designed for lighting applications. This device is packaged in SOT-23-6 (different from the 8-SOIC package of the LYT2004D), lacks an internal switch, and has a maximum operating temperature of 125°C. The different package type requires PCB layout redesign. Product status is Active with RoHS3 compliance and MSL 1 rating.

NCL30000DR2G (Similar Substitute - onsemi)

The NCL30000DR2G is an LED driver IC with flyback and step-down buck topology for lighting applications. This device lacks an internal switch and operates with a voltage supply range of 8.8V to 20V. The device maintains the 8-SOIC package configuration and -40°C ~ 125°C operating temperature range. Product status is Active with RoHS3 compliance and MSL 1 rating.

RT7320GSP (Similar Substitute - Richtek USA Inc.)

The RT7320GSP is an LED driver IC with offline switching capability and internal switch configuration. This device has a significantly lower maximum operating temperature (85°C versus 150°C), operates with a 0V to 100V voltage supply range, and has a higher moisture sensitivity level (MSL 3 versus MSL 1). Product status is Obsolete, making this option unsuitable for new designs or long-term supply continuity. RoHS3 compliant.

Frequently Asked Questions (FAQ)

Q: Can the LYT2005E directly replace the LYT2004D without circuit modifications?

A: The LYT2005E is a parametric equivalent with identical electrical and mechanical specifications except for increased power output (12W versus 8W). Direct replacement is possible without circuit modifications. The higher power rating does not create incompatibility with applications designed for 8W operation.

Q: Why is the LYT2005E preferred over other substitute options?

A: The LYT2005E maintains all critical parameters of the LYT2004D including topology, isolation, internal switch configuration, breakdown voltage, switching frequency, duty cycle, operating temperature range, and package type. It is the only parametric equivalent among the substitute options. All other substitutes differ in one or more critical parameters that may require circuit redesign or limit application compatibility.

Q: What is the significance of the internal switch configuration difference?

A: The LYT2004D and LYT2005E both feature integrated internal switches, which is a core design characteristic of the LYTSwitch™-2 series. Substitute parts without internal switches (FL7733AMX, IRS2982STRPBF, MP4026GJ-Z, NCL30000DR2G) require external switching components, fundamentally altering circuit topology and requiring significant redesign.

Q: Are all substitute parts RoHS compliant?

A: Yes, all substitute parts listed are RoHS compliant (either RoHS or ROHS3 standard). The LYT2004D is RoHS Compliant, and all substitutes meet or exceed this compliance requirement.

Q: What is the impact of different operating temperature ranges?

A: The LYT2004D operates from -40°C to 150°C (TJ). The LYT2005E matches this range exactly. Other substitutes have narrower ranges: FL7733AMX and NCL30000DR2G operate to 125°C, IRS2982STRPBF to 125°C with a higher minimum (-25°C), MP4026GJ-Z to 125°C, and RT7320GSP to only 85°C. Applications requiring the full -40°C to 150°C range must use the LYT2005E.

Q: Why is the RT7320GSP not recommended despite having an internal switch?

A: The RT7320GSP has Obsolete product status, indicating end-of-life and no ongoing manufacturing or support. Additionally, its maximum operating temperature of 85°C is significantly lower than the LYT2004D's 150°C, and its MSL 3 rating indicates higher moisture sensitivity (168 hours) compared to MSL 1 (Unlimited). These factors make it unsuitable for new designs or long-term supply requirements.

Q: What package considerations apply to the MP4026GJ-Z?

A: The MP4026GJ-Z uses SOT-23-6 packaging, which differs from the 8-SOIC package of the LYT2004D. This package difference requires PCB layout redesign, including different pad patterns, spacing, and thermal management considerations. Direct board-level substitution is not possible without layout modifications.

Q: How does switching frequency affect substitution compatibility?

A: The LYT2004D operates at 85kHz. The LYT2005E matches this frequency exactly. The IRS2982STRPBF operates at 320kHz, which is significantly higher. Switching frequency affects transformer design, EMI characteristics, and component selection. Substitutes with different switching frequencies may require transformer redesign and EMI filter modifications.

Q: Are all substitute parts currently available?

A: The LYT2005E, FL7733AMX, IRS2982STRPBF, MP4026GJ-Z, and NCL30000DR2G have Active product status with current inventory availability. The RT7320GSP has Obsolete status, indicating it is no longer manufactured or supported, making it unavailable for new procurement.