LYT2004K Equivalent & Substitute Parts

Part Overview

The LYT2004K 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 10W power capability and features a 725V breakdown voltage rating. The LYT2004K is part of the LYTSwitch™-2 series and is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design support and component procurement.

Substiute Parts

LYT2004K

Power IntegrationsIn Stock: 2236LYT2004K Datasheet

Current PartRFQ

AL1692S-13

Diodes IncorporatedIn Stock: 120128AL1692S-13 Datasheet

SimilarRFQ

AP1680K6TR-G1

Diodes IncorporatedIn Stock: 31119AP1680K6TR-G1 Datasheet

SimilarRFQ

NCL30030B3DR2G

onsemiIn Stock: 20139NCL30030B3DR2G Datasheet

SimilarRFQ

TPS92315DBVR

Texas InstrumentsIn Stock: 15623TPS92315DBVR Datasheet

SimilarRFQ

XDPL8105XUMA1

Infineon TechnologiesIn Stock: 35458XDPL8105XUMA1 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LYT2004K requires evaluation based on the following critical parameters:

Primary Substitution Criteria:

• Topology: Flyback converter architecture
• Output Isolation: Isolated power delivery capability
• Internal Switch Integration: Integrated power switch functionality
• Voltage Rating: Breakdown voltage capability ≥725V
• Power Capability: Minimum 10W output power
• Switching Frequency: Operating frequency range compatible with 85kHz design
• Operating Temperature Range: Support for -40°C to 150°C junction temperature
• Package Compatibility: Surface mount configuration with appropriate lead count and pitch

Secondary Compatibility Factors:

• RoHS and REACH compliance status
• Moisture sensitivity level (MSL) rating
• Supply voltage requirements
• Duty cycle specifications

The substitute parts identified (NCL30030B3DR2G, AL1692S-13, XDPL8105XUMA1, TPS92315DBVR) share the flyback topology and offline switcher architecture. However, these alternatives function as LED driver ICs with AC/DC offline switcher capability rather than general-purpose isolated flyback converters. Substitution feasibility depends on application-specific requirements including output power levels, isolation voltage requirements, and thermal operating conditions.

Parameter Comparison

Engineering Selection Recommendations

NCL30030B3DR2G (onsemi)

The NCL30030B3DR2G is an active AC/DC offline switcher with flyback topology. This device operates with supply voltage range 9V to 30V and supports -40°C to 125°C junction temperature operation. The 16-SOIC package differs from the LYT2004K's 12-BESOP configuration, requiring PCB layout modification. ROHS3 compliance and unlimited MSL rating provide superior environmental stability. This substitute is suitable for applications where the LYT2004K's 725V breakdown voltage and 10W power capability can be accommodated within the NCL30030B3DR2G's specified operating parameters.

AL1692S-13 (Diodes Incorporated)

The AL1692S-13 operates as an AC/DC offline switcher with multi-topology support (Flyback, Buck, Boost). Supply voltage range spans 8.5V to 20V with 4kHz switching frequency. Operating temperature range -40°C to 105°C (ambient) is lower than the LYT2004K. The 8-SOIC package provides compact form factor. Unlimited MSL rating and ROHS3 compliance support long-term reliability. This substitute is applicable for lower-power applications with reduced thermal requirements.

XDPL8105XUMA1 (Infineon Technologies)

The XDPL8105XUMA1 is an XDP™ series AC/DC offline switcher with flyback topology. Operating parameters include 6V to 24V supply voltage and 180kHz switching frequency. The -40°C to 85°C ambient temperature range is lower than the LYT2004K's junction temperature specification. The 8-SOIC package requires PCB redesign. MSL 3 rating matches the LYT2004K. ROHS3 compliance is confirmed. This substitute is suitable for applications with moderate thermal operating conditions.

TPS92315DBVR (Texas Instruments)

The TPS92315DBVR is an AC/DC offline switcher with flyback topology, operating at 130kHz switching frequency. Supply voltage range 9V to 35V and -20°C to 125°C junction temperature operation provide broad compatibility. The SOT-23-6 package is significantly smaller than the LYT2004K, enabling space-constrained designs. MSL 2 rating and ROHS3 compliance support standard manufacturing environments. This substitute is applicable for compact power management designs.

AP1680K6TR-G1 (Diodes Incorporated)

The AP1680K6TR-G1 is an AC/DC offline switcher with flyback topology. Maximum supply voltage rating of 36V and -40°C to 105°C ambient temperature operation provide moderate thermal capability. The SOT-23-6 package enables miniaturized implementations. Unlimited MSL rating and ROHS3 compliance support extended storage and manufacturing flexibility. This substitute is suitable for low-power, space-constrained applications.

Substitution Feasibility Summary:

All identified substitutes share flyback topology and AC/DC offline switcher architecture. However, critical differences exist:

• The LYT2004K features integrated internal power switch; all substitutes lack this integration
• The LYT2004K specifies 725V breakdown voltage; substitute devices do not provide equivalent voltage ratings
• The LYT2004K supports 10W power output; substitute power capabilities are not specified
• Package configurations differ significantly, requiring PCB redesign
• Operating temperature ranges vary, with the LYT2004K supporting higher junction temperatures (150°C)

Substitution is feasible only for applications where the LYT2004K's specific voltage, power, and thermal characteristics are not critical design requirements.

Frequently Asked Questions (FAQ)

Q1: Can the NCL30030B3DR2G directly replace the LYT2004K without circuit modification?

A: No. The NCL30030B3DR2G requires circuit redesign. The LYT2004K integrates an internal power switch, while the NCL30030B3DR2G does not. Additionally, the package changes from 12-BESOP to 16-SOIC, necessitating PCB layout modification. Supply voltage requirements (9V to 30V for NCL30030B3DR2G versus unspecified for LYT2004K) must be verified against your application.

Q2: What is the primary difference between the LYT2004K and the substitute parts?

A: The LYT2004K is a general-purpose offline switch flyback converter with integrated internal power switch and 725V breakdown voltage rating. The substitute parts are LED driver ICs with AC/DC offline switcher capability but without integrated power switches. The LYT2004K is designed for isolated power conversion applications, while substitutes are optimized for LED driver applications.

Q3: Which substitute part has the closest operating temperature range to the LYT2004K?

A: The NCL30030B3DR2G and TPS92315DBVR both support -40°C minimum operating temperature. However, the LYT2004K specifies -40°C to 150°C junction temperature, while NCL30030B3DR2G supports -40°C to 125°C (TJ) and TPS92315DBVR supports -20°C to 125°C (TJ). For high-temperature applications exceeding 125°C, no suitable substitute is available from the provided list.

Q4: Are all substitute parts RoHS and REACH compliant?

A: Yes. All substitute parts (NCL30030B3DR2G, AL1692S-13, XDPL8105XUMA1, TPS92315DBVR, AP1680K6TR-G1) are ROHS3 compliant and REACH unaffected, matching the LYT2004K's compliance status.

Q5: Which substitute part offers the smallest package footprint?

A: The TPS92315DBVR and AP1680K6TR-G1 both use SOT-23-6 packaging, providing the smallest footprint compared to the LYT2004K's 12-BESOP and other substitutes' SOIC packages. SOT-23-6 is suitable for space-constrained applications.

Q6: What is the significance of MSL (Moisture Sensitivity Level) ratings in the substitute parts?

A: MSL ratings indicate moisture sensitivity during storage and handling. The LYT2004K and XDPL8105XUMA1 have MSL 3 (168 hours), requiring controlled storage conditions. AL1692S-13, AP1680K6TR-G1, and NCL30030B3DR2G have MSL 1 (unlimited), providing superior storage flexibility. TPS92315DBVR has MSL 2 (1 year), offering intermediate storage capability. Lower MSL ratings reduce manufacturing constraints.

Q7: Can the AL1692S-13 be used in applications requiring high switching frequency?

A: No. The AL1692S-13 operates at 4kHz switching frequency, significantly lower than the LYT2004K's 85kHz. This frequency difference affects transformer design, EMI characteristics, and power density. Applications requiring 85kHz operation should consider XDPL8105XUMA1 (180kHz) or TPS92315DBVR (130kHz) instead.

Q8: What are the supply voltage compatibility considerations for substitution?

A: The LYT2004K does not specify supply voltage requirements. Substitute parts have defined ranges: NCL30030B3DR2G (9V-30V), AL1692S-13 (8.5V-20V), XDPL8105XUMA1 (6V-24V), TPS92315DBVR (9V-35V), AP1680K6TR-G1 (max 36V). Your application's supply voltage must fall within the substitute part's specified range for proper operation.

Q9: Is the LYT2004K's 55% duty cycle specification matched by any substitute part?

A: No. None of the substitute parts provide duty cycle specifications in the available data. Duty cycle is application-dependent and determined by transformer design and control loop characteristics rather than an inherent device specification. Duty cycle must be verified through circuit simulation or prototype testing.

Q10: Which substitute part is recommended for LED driver applications?

A: All substitute parts are specifically designed as LED driver ICs. The NCL30030B3DR2G, AL1692S-13, XDPL8105XUMA1, TPS92315DBVR, and AP1680K6TR-G1 are optimized for lighting and signage applications. Selection depends on specific power requirements, dimming capability needs, and thermal operating conditions. The NCL30030B3DR2G explicitly lists "Lighting, Signage" applications.