LYT2002D Equivalent & Substitute Parts

Part Overview

The LYT2002D is an offline switch flyback converter IC manufactured by Power Integrations, part of the LYTSwitch™-2 series. This 8-SOIC surface mount device operates at 85kHz switching frequency with 725V breakdown voltage and delivers 6W power output in an isolated topology. The LYT2002D is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design requirements and production continuity.

Substiute Parts

LYT2002D

Power IntegrationsIn Stock: 5526LYT2002D Datasheet

Current PartRFQ

LYT2005E

Power IntegrationsIn Stock: 4577LYT2005E Datasheet

Parametric EquivalentRFQ

CPC9909N

IXYS Integrated Circuits DivisionIn Stock: 1971CPC9909N Datasheet

SimilarRFQ

LM3450MT/NOPB

Texas InstrumentsIn Stock: 2073LM3450MT/NOPB Datasheet

SimilarRFQ

MP4652ES-LF

Monolithic Power Systems Inc.In Stock: 1112MP4652ES-LF Datasheet

SimilarRFQ

MXHV9910BE

IXYS Integrated Circuits DivisionIn Stock: 1304MXHV9910BE Datasheet

SimilarRFQ

TPS92315DBVR

Texas InstrumentsIn Stock: 15623TPS92315DBVR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution logic for the LYT2002D is based on the following critical parameters that define functional equivalence:

Primary Equivalence Criteria:

• Topology: Flyback converter architecture
• Output Isolation: Isolated configuration
• Voltage - Breakdown: 725V or higher
• Frequency - Switching: 85kHz nominal operation
• Power Rating: 6W or higher capacity
• Internal Switch(s): Integrated switching element
• Package Compatibility: 8-SOIC form factor preferred for direct PCB replacement

Parametric Equivalent: The LYT2005E from Power Integrations meets all primary equivalence criteria. It shares identical topology, isolation, breakdown voltage, switching frequency, duty cycle, and package specifications. The LYT2005E provides 12W power capacity (exceeding the 6W requirement) and maintains active product status with RoHS compliance and unlimited MSL rating.

Similar Substitute Parts: The following components provide functional substitution based on partial parameter alignment:

• CPC9909N (IXYS): AC DC offline switcher with PWM dimming, 30kHz-120kHz frequency range, 550V maximum supply voltage, 8-SOIC package
• LM3450MT/NOPB (Texas Instruments): AC DC offline switcher with flyback topology, internal switch, 16-TSSOP package, analog dimming capability
• MP4652ES-LF (Monolithic Power Systems): AC DC offline switcher with half-bridge topology, 50kHz frequency, 16-SOIC package, PWM dimming
• MXHV9910BE (IXYS): AC DC offline switcher with step-down topology, 64kHz frequency, 450V maximum supply, 8-SOIC-EP package
• TPS92315DBVR (Texas Instruments): AC DC offline switcher with flyback topology, 130kHz frequency, SOT-23-6 package

Parameter Comparison

Engineering Selection Recommendations

Direct Replacement (Parametric Equivalent):

The LYT2005E is the recommended direct replacement for the LYT2002D. Both components are manufactured by Power Integrations within the LYT Switch™-2 series and share identical electrical specifications: 725V breakdown voltage, 85kHz switching frequency, 55% duty cycle, isolated flyback topology with internal switching element, and 8-SOIC package configuration. The LYT2005E maintains active product status with full RoHS compliance and unlimited MSL rating. The increased power rating (12W versus 6W) provides design margin without requiring circuit modifications. Inventory availability is confirmed at 4547 units.

Alternative Substitutes (Application-Dependent):

Selection of alternative substitute parts requires evaluation of specific application requirements:

• LM3450MT/NOPB (Texas Instruments): Suitable for applications requiring flyback topology with analog dimming capability. Requires 16-TSSOP package accommodation and operates within 8.5V-20V supply range. Active product status with ROHS3 compliance.

• MXHV9910BE (IXYS): Applicable for step-down buck topology applications with 450V maximum supply voltage and 64kHz switching frequency. Provides 8-SOIC-EP package with exposed pad for thermal management. Active product status with ROHS3 compliance and unlimited MSL.

• CPC9909N (IXYS): Suitable for PWM dimming applications with flexible frequency range (30kHz-120kHz) and 550V maximum supply voltage. 8-SOIC package enables direct PCB footprint compatibility. Active product status with ROHS3 compliance.

• TPS92315DBVR (Texas Instruments): Applicable for compact form factor requirements using SOT-23-6 package. Operates at 130kHz switching frequency with 9V-35V supply range. Active product status with ROHS3 compliance.

All substitute parts maintain RoHS compliance and are actively manufactured. Selection should be based on specific circuit topology requirements, thermal management needs, package footprint constraints, and supply voltage specifications of the target application.

Frequently Asked Questions (FAQ)

Q1: Can the LYT2005E directly replace the LYT2002D without PCB modifications?

A: Yes. The LYT2005E is a parametric equivalent with identical package (8-SOIC, 7 leads), pinout, topology (isolated flyback), voltage rating (725V), switching frequency (85kHz), and duty cycle (55%). Direct PCB substitution is possible without circuit redesign. The increased power rating (12W versus 6W) provides additional design margin.

Q2: Why are the alternative substitute parts listed as "similar" rather than "equivalent"?

A: The alternative parts differ in one or more critical parameters from the LYT2002D. Differences include topology variations (buck, boost, half-bridge), package form factors (16-TSSOP, 16-SOIC, SOT-23-6), switching frequencies (30kHz-130kHz range), supply voltage specifications, and internal switch configuration. These parts require circuit evaluation and potential redesign for successful substitution.

Q3: What is the significance of the 8-SOIC package specification?

A: The 8-SOIC (0.154", 3.90mm width) package defines the physical footprint and pin configuration on the PCB. The LYT2002D and LYT2005E share this package specification, enabling direct footprint compatibility. Alternative parts using different packages (16-TSSOP, 16-SOIC, SOT-23-6) require PCB layout modifications and cannot be used as drop-in replacements.

Q4: What does "isolated" topology mean in the context of the LYT2002D?

A: Isolated topology indicates galvanic isolation between input and output circuits through transformer coupling in the flyback converter. This isolation provides safety benefits and noise reduction in applications requiring separation between primary and secondary sides. Not all substitute parts specify isolation characteristics.

Q5: How does the 725V breakdown voltage rating affect substitute selection?

A: The 725V breakdown voltage represents the maximum voltage the internal switching element can withstand. For direct replacement, substitute parts should maintain equal or higher breakdown voltage ratings. The LYT2005E matches this specification at 725V. Alternative parts with lower maximum supply voltages (20V, 30V, 35V) are designed for different input voltage ranges and require application-specific evaluation.

Q6: What is the importance of the 85kHz switching frequency specification?

A: The 85kHz switching frequency determines the converter's operational speed, affecting transformer design, output filter requirements, and electromagnetic interference (EMI) characteristics. The LYT2005E maintains identical 85kHz operation. Alternative parts operate at different frequencies (30kHz-130kHz range), potentially requiring transformer and filter redesign.

Q7: Why is product status (Active vs. Discontinued) relevant to substitution decisions?

A: Active product status ensures ongoing manufacturing, availability, and technical support from the manufacturer. The LYT2002D is discontinued at DiGi Electronics, limiting future procurement options. The LYT2005E and all alternative substitutes maintain active status, providing long-term supply chain reliability and design continuity.

Q8: What does RoHS compliance indicate?

A: RoHS (Restriction of Hazardous Substances) compliance certifies that the component meets environmental regulations restricting lead, cadmium, mercury, and other hazardous materials. Both the LYT2002D and all substitute parts are RoHS compliant (RoHS or ROHS3 status), meeting regulatory requirements for commercial and industrial applications.

Q9: How does Moisture Sensitivity Level (MSL) affect component handling?

A: MSL rating indicates the component's sensitivity to moisture absorption during storage and handling. MSL 1 (Unlimited) components like the LYT2002D and LYT2005E have no moisture-related storage restrictions. MSL 2 (1 Year) components require controlled storage conditions and have a one-year shelf life limit. Selection should consider manufacturing environment and storage capabilities.

Q10: Can multiple substitute parts be used interchangeably in the same design?

A: No. Each substitute part has distinct electrical and physical specifications. Interchangeability is limited to the LYT2005E as a parametric equivalent. Alternative substitutes require individual circuit evaluation, potential redesign, and validation testing specific to each component's characteristics before implementation.