LYT2003D Equivalent & Substitute Parts

Part Overview

The LYT2003D is an offline switch flyback converter IC manufactured by Power Integrations, part of the LYTSwitch™-2 series. This device integrates a high-voltage power switch with control circuitry for isolated flyback topology applications, operating at 85kHz switching frequency with 7W power output capability. The LYT2003D is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design support and procurement.

Substiute Parts

LYT2003D

Power IntegrationsIn Stock: 2109LYT2003D Datasheet

Current PartRFQ

LYT2005E

Power IntegrationsIn Stock: 4577LYT2005E Datasheet

Parametric EquivalentRFQ

AL9910-5SP-13

Diodes IncorporatedIn Stock: 11701AL9910-5SP-13 Datasheet

SimilarRFQ

HV9921N3-G

Microchip TechnologyIn Stock: 5375HV9921N3-G Datasheet

SimilarRFQ

IRS2982STRPBF

Infineon TechnologiesIn Stock: 5245IRS2982STRPBF Datasheet

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MP4000DS-LF

Monolithic Power Systems Inc.In Stock: 1316MP4000DS-LF Datasheet

SimilarRFQ

TPS92410D

Texas InstrumentsIn Stock: 1987TPS92410D Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution logic for the LYT2003D is based on the following critical parameters that define functional equivalence:

Primary Equivalence Criteria:

• Topology: Flyback converter architecture
• Output Isolation: Isolated configuration
• Internal Switch Integration: Integrated high-voltage power switch
• Voltage Breakdown Rating: 725V or higher
• Switching Frequency: 85kHz operation
• Package Compatibility: 8-SOIC surface mount form factor
• Power Rating: 7W or higher output capability

Substitute Classification:

Parametric Equivalent: LYT2005E meets all primary equivalence criteria with identical topology, isolation, switching frequency, package, and operating temperature range. The primary difference is increased power output (12W vs 7W) and active product status with higher inventory availability.

Similar Substitutes: HV9921N3-G, AL9910-5SP-13, IRS2982STRPBF, MP4000DS-LF, and TPS92410D are classified as similar substitutes due to shared offline switcher architecture and AC/DC conversion capability. These parts operate in different topologies (buck, boost, or buck-boost) and voltage supply ranges, requiring circuit redesign evaluation for specific applications.

Parameter Comparison

Engineering Selection Recommendations

Direct Parametric Equivalent:

LYT2005E is the recommended direct replacement for LYT2003D. Both components share identical topology (flyback), isolation architecture, switching frequency (85kHz), duty cycle (55%), operating temperature range (-40°C to 150°C), and 8-SOIC package configuration. LYT2005E offers increased power output (12W vs 7W), providing design margin for existing applications. The component is currently active with 4,547 units in stock, ensuring procurement availability. Both parts maintain RoHS compliance and MSL-1 moisture sensitivity rating.

Similar Substitutes for Circuit Redesign:

Alternative offline switcher ICs (HV9921N3-G, AL9910-5SP-13, IRS2982STRPBF, TPS92410D) require circuit topology evaluation and redesign. These components operate in different converter topologies (buck, boost, or buck-boost) with varying voltage supply ranges and switching frequencies. Selection of these alternatives demands full schematic review, transformer design modification, and control circuit adaptation. All similar substitutes maintain ROHS3 compliance and are currently active products.

Compliance Considerations:

All listed substitutes maintain RoHS compliance status. LYT2003D and LYT2005E carry MSL-1 rating (unlimited moisture sensitivity), while IRS2982STRPBF and TPS92410D carry MSL-2 rating (1-year moisture sensitivity), requiring adjusted storage and handling protocols. All components are REACH unaffected and classified under ECCN EAR99.

Frequently Asked Questions (FAQ)

Q: Can LYT2005E be used as a direct drop-in replacement for LYT2003D?

A: LYT2005E is a parametric equivalent with identical topology, isolation, switching frequency, duty cycle, operating temperature range, and 8-SOIC package. The increased power rating (12W vs 7W) provides design margin. Pin-to-pin compatibility and control signal requirements must be verified against the specific application schematic before implementation.

Q: What is the primary difference between LYT2003D and LYT2005E?

A: The primary difference is power output capability: LYT2003D is rated for 7W while LYT2005E is rated for 12W. Both operate at identical switching frequency (85kHz), duty cycle (55%), and voltage breakdown (725V). LYT2005E is currently active with higher inventory availability.

Q: Why are HV9921N3-G, AL9910-5SP-13, and other similar substitutes not direct replacements?

A: These components operate in different converter topologies (buck, boost, or buck-boost) compared to the LYT2003D flyback architecture. They have different voltage supply ranges, switching frequencies, and control requirements. Substitution requires complete circuit redesign, transformer modification, and control circuit adaptation.

Q: What package considerations apply to these substitutes?

A: LYT2003D and LYT2005E both use 8-SOIC surface mount packages with 7 leads. HV9921N3-G uses through-hole TO-92-3 package, requiring PCB layout modification. AL9910-5SP-13 uses 8-SOIC with exposed pad. IRS2982STRPBF uses standard 8-SOIC. TPS92410D uses 14-SOIC with 13 leads. Package differences affect PCB footprint, thermal management, and assembly compatibility.

Q: Are there moisture sensitivity differences between LYT2003D and the substitute parts?

A: LYT2003D and LYT2005E carry MSL-1 rating (unlimited moisture sensitivity). IRS2982STRPBF and TPS92410D carry MSL-2 rating (1-year moisture sensitivity), requiring stricter storage conditions and shorter shelf life management. AL9910-5SP-13 and HV9921N3-G carry MSL-1 rating.

Q: What is the operating temperature range difference between LYT2003D and similar substitutes?

A: LYT2003D operates from -40°C to 150°C (junction temperature). HV9921N3-G operates from -40°C to 85°C (ambient temperature), providing narrower thermal range. AL9910-5SP-13 operates from -40°C to 105°C. IRS2982STRPBF operates from -25°C to 125°C. TPS92410D operates from -40°C to 125°C. Temperature range differences affect application suitability for high-temperature environments.

Q: Are all substitute parts RoHS compliant?

A: Yes. LYT2003D and LYT2005E are RoHS Compliant. All similar substitutes (HV9921N3-G, AL9910-5SP-13, IRS2982STRPBF, TPS92410D) are ROHS3 Compliant. All components are REACH unaffected and classified under ECCN EAR99.