LYT2001D-TL Equivalent & Substitute Parts

Part Overview

The LYT2001D-TL is an offline switch flyback converter IC manufactured by Power Integrations, part of the LYTSwitch™-2 series. This device integrates a 725V breakdown voltage power switch with isolated flyback topology, operating at 85kHz switching frequency with 6W power output capability. The part is currently discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design support and production continuity. Direct substitutes within the LYTSwitch™-2 family and parametric equivalents from alternative manufacturers are available to maintain circuit functionality and performance specifications.

Substiute Parts

LYT2001D-TL

Power IntegrationsIn Stock: 772LYT2001D-TL Datasheet

Current PartRFQ

LYT2002D-TL

Power IntegrationsIn Stock: 720LYT2002D-TL Datasheet

DirectRFQ

LYT0005D-TL

Power IntegrationsIn Stock: 2990LYT0005D-TL Datasheet

SimilarRFQ

LYT2003D-TL

Power IntegrationsIn Stock: 759LYT2003D-TL Datasheet

Parametric EquivalentRFQ

LYT2004D-TL

Power IntegrationsIn Stock: 734LYT2004D-TL Datasheet

Parametric EquivalentRFQ

LM3497MMX/NOPB

Texas InstrumentsIn Stock: 3835LM3497MMX/NOPB Datasheet

SimilarRFQ

MP4054AGJ-P

Monolithic Power Systems Inc.In Stock: 1020MP4054AGJ-P Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LYT2001D-TL is determined by the following critical parameters that must be maintained or exceeded:

Primary Substitution Criteria:

• Topology: Flyback (isolated converter architecture)
• Voltage - Breakdown: 725V minimum
• Frequency - Switching: 85kHz
• Power Output: 6W minimum
• Duty Cycle: 55%
• Package / Case: 8-SOIC (SO-8C) form factor
• Operating Temperature Range: -40°C ~ 150°C (TJ)
• Internal Switch Integration: Yes (integrated power switch required)
• Output Isolation: Isolated

Substitution Categories:

Direct Manufacturer Substitutes maintain identical electrical specifications and packaging within the Power Integrations LYTSwitch™-2 family. These parts are pin-compatible and functionally equivalent with no circuit redesign required.

Parametric Equivalents share the same core electrical parameters (topology, voltage rating, switching frequency, power class, temperature range, and package) but may originate from different manufacturers. These require verification of pin configuration and control feature compatibility.

Similar Topology Alternatives operate on the same flyback principle with comparable voltage and frequency specifications but may have different power ratings or control features. These are suitable for applications where power output requirements permit uprating or downrating.

Parameter Comparison

Engineering Selection Recommendations

Tier 1: Direct Substitutes (Recommended for Drop-In Replacement)

LYT2002D-TL and LYT2003D-TL are the primary recommended substitutes. Both are active products from Power Integrations within the LYTSwitch™-2 series, maintaining identical topology, voltage rating, switching frequency, duty cycle, temperature range, and SO-8C packaging. LYT2002D-TL provides equivalent 6W power output with RoHS compliance and Tape & Reel packaging. LYT2004D-TL offers 8W power output, providing design margin for applications requiring higher power delivery while maintaining all other electrical and mechanical specifications. All three direct substitutes are RoHS Compliant and REACH Unaffected, suitable for current production requirements.

Tier 2: Parametric Equivalents (Requires Pin Configuration Verification)

LYT0005D-TL operates on flyback topology with integrated power switch and SO-8C packaging but is part of the LYTSwitch™-0 series with 66kHz switching frequency and reduced operating temperature maximum of 125°C. This part is suitable only for applications where the lower switching frequency and temperature rating do not conflict with circuit requirements.

Tier 3: Alternative Topology Solutions (Requires Circuit Redesign)

LM3497MMX/NOPB (Texas Instruments) and MP4054AGJ-P (Monolithic Power Systems) operate on buck topology without integrated power switches and in different package formats (10-VSSOP and TSOT-23-8 respectively). These parts require significant circuit redesign and are not recommended as direct substitutes for isolated flyback applications.

Compliance and Certification:

All recommended Tier 1 substitutes maintain RoHS Compliance, REACH Unaffected status, EAR99 export classification, and MSL 1 moisture sensitivity rating, ensuring compatibility with current manufacturing and regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can LYT2002D-TL directly replace LYT2001D-TL without circuit modification?

A: Yes. LYT2002D-TL is a direct substitute within the LYTSwitch™-2 family, maintaining identical topology (flyback), voltage rating (725V), switching frequency (85kHz), duty cycle (55%), operating temperature range (-40°C ~ 150°C), and SO-8C package. Pin configuration and control features are compatible. No circuit redesign is required.

Q: What is the difference between LYT2002D-TL, LYT2003D-TL, and LYT2004D-TL?

A: All three parts share identical topology, voltage, frequency, and package specifications. The primary difference is power output rating: LYT2002D-TL and LYT2001D-TL are rated for 6W, LYT2003D-TL for 7W, and LYT2004D-TL for 8W. Higher power ratings provide design margin for applications approaching the 6W limit of the original part.

Q: Why are LM3497MMX/NOPB and MP4054AGJ-P listed as substitutes if they use different topologies?

A: These parts are listed as similar alternatives based on the original part's substitute list but are not recommended for direct replacement. They operate on buck topology without integrated power switches and require different package footprints. They are suitable only for new designs where isolated flyback topology is not required.

Q: Is LYT0005D-TL suitable as a substitute for LYT2001D-TL?

A: LYT0005D-TL shares flyback topology and SO-8C packaging but operates at 66kHz (versus 85kHz) and has a maximum operating temperature of 125°C (versus 150°C). It is suitable only if the application can tolerate lower switching frequency and reduced temperature rating. Verification of control features and pin compatibility is required.

Q: What packaging options are available for direct substitutes?

A: LYT2002D-TL, LYT2003D-TL, and LYT2004D-TL are available in Tape & Reel (TR) packaging in 8-SOIC (SO-8C) form factor with 7 leads. This maintains mechanical compatibility with LYT2001D-TL PCB layouts. All parts are surface mount components.

Q: Are all recommended substitutes RoHS compliant?

A: Yes. LYT2002D-TL, LYT2003D-TL, and LYT2004D-TL are all RoHS Compliant. LYT0005D-TL is also RoHS Compliant. All recommended Tier 1 substitutes meet current environmental and regulatory requirements.

Q: What is the inventory status of substitute parts?

A: LYT2002D-TL has 683 pieces in stock, LYT2003D-TL has 719 pieces, and LYT2004D-TL has 686 pieces. All are active products with ongoing availability. LYT0005D-TL has 2897 pieces in stock as an alternative option.

Q: Can I use a higher power-rated part (LYT2004D-TL at 8W) in a design specified for 6W?

A: Yes. LYT2004D-TL maintains all electrical and thermal specifications of LYT2001D-TL while providing higher power output capability. This provides design margin and is suitable for applications where the original 6W specification is not a hard constraint. No circuit modification is required.