LYT2004D-TL Equivalent & Substitute Parts

Part Overview

The LYT2004D-TL is an offline switch flyback converter IC manufactured by Power Integrations, operating in the LYTSwitch™-2 series. This isolated power management IC is designed for flyback topology applications with an 85kHz switching frequency and 8W power output capability. The device is classified as Active product status with full RoHS compliance and unlimited moisture sensitivity rating.

Substitute parts are identified when equivalent electrical and mechanical parameters align with the main part's specifications, enabling direct or near-direct replacement in compatible circuit designs. Substitution is necessary when the primary part reaches end-of-life status, inventory constraints occur, or design flexibility requires alternative qualified sources.

Substiute Parts

LYT2004D-TL

Power IntegrationsIn Stock: 734LYT2004D-TL Datasheet

Current PartRFQ

AL9901FDF-13

Diodes IncorporatedIn Stock: 8972AL9901FDF-13 Datasheet

SimilarRFQ

AP1685MTR-G1

Diodes IncorporatedIn Stock: 40399AP1685MTR-G1 Datasheet

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RT7306DGS

Richtek USA Inc.In Stock: 10753RT7306DGS Datasheet

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UCC28811D

Texas InstrumentsIn Stock: 3480UCC28811D Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LYT2004D-TL are qualified based on the following critical parameters:

Primary Substitution Criteria:

• Topology Compatibility: Flyback topology or multi-topology support (Flyback, Step-Down, Step-Up)
• Package Compatibility: 8-SOIC or equivalent surface-mount package with matching pin count and physical dimensions
• Voltage Rating: Breakdown voltage capability ≥725V or supply voltage range supporting offline operation
• Switching Frequency: Operating frequency in the range of 85kHz or higher for comparable performance
• Output Isolation: Isolated output configuration for safety-critical applications
• Internal Switch: Presence of integrated switching element
• Operating Temperature Range: Minimum -40°C to maximum ≥150°C or equivalent thermal performance
• Product Status: Active status ensuring ongoing availability and support
• Compliance: RoHS and REACH compliance matching the main part

Substitute Parts Identified:

1. RT7306DGS (Richtek USA Inc.) - Multi-topology LED driver supporting Flyback, Step-Down, and Step-Up configurations with 8-SOIC package and analog dimming capability
2. UCC28811D (Texas Instruments) - Multi-topology LED driver supporting Flyback, Step-Down, and Step-Up configurations with 8-SOIC package and TRIAC dimming capability
3. AL9901FDF-13 (Diodes Incorporated) - AC DC offline switcher with step-down topology, 12-pin DFN package, and PWM dimming
4. AP1685MTR-G1 (Diodes Incorporated) - AC DC offline switcher with step-down topology, 7-SO package, and 2.5A output capability

Parameter Comparison

Engineering Selection Recommendations

RT7306DGS - Recommended for applications requiring multi-topology flexibility with flyback support. This part maintains 8-SOIC package compatibility and supports analog dimming. Operating temperature range extends to 125°C, suitable for most thermal environments. Active product status and ROHS3 compliance ensure long-term availability.

UCC28811D - Suitable for applications requiring TRIAC dimming capability with multi-topology support. The 8-SOIC package provides direct mechanical compatibility. MSL rating of 1 (Unlimited) matches the main part's moisture sensitivity profile. Active status and ROHS3 compliance support production continuity.

AL9901FDF-13 - Applicable for LED driver applications with step-down topology and PWM dimming. Package differs from the main part (12-UDFN vs. 8-SOIC), requiring PCB layout modifications. MSL rating of 1 (Unlimited) and ROHS3 compliance ensure handling compatibility. Higher inventory availability (8890 pcs) supports supply chain flexibility.

AP1685MTR-G1 - Suitable for step-down converter applications with 2.5A output capability. The 7-SO package provides mechanical compatibility with the main part's 8-SOIC footprint. MSL rating of 3 (168 Hours) requires controlled storage conditions. Active status and ROHS3 compliance support production use.

All substitute parts maintain Active product status, REACH Unaffected classification, and RoHS compliance, ensuring regulatory alignment with the main part.

Frequently Asked Questions (FAQ)

Q: Can RT7306DGS directly replace LYT2004D-TL in existing designs?

A: RT7306DGS shares the 8-SOIC package and supports flyback topology. However, RT7306DGS does not include an internal switch, whereas LYT2004D-TL includes an integrated switching element. Circuit design modifications may be required to accommodate external switching components.

Q: What is the primary difference between UCC28811D and RT7306DGS?

A: Both support multi-topology configurations (Flyback, Step-Down, Step-Up) and use 8-SOIC packaging. UCC28811D features TRIAC dimming capability, while RT7306DGS provides analog dimming. Neither includes an internal switch. Selection depends on dimming control requirements.

Q: Why does AL9901FDF-13 use a different package (12-UDFN) compared to the main part?

A: AL9901FDF-13 is optimized for LED driver applications with higher integration density, resulting in a 12-pin DFN package. This package change requires PCB layout redesign and is not a direct pin-compatible replacement.

Q: Is AP1685MTR-G1 suitable for high-temperature applications?

A: AP1685MTR-G1 operates to 105°C (TA), which is lower than LYT2004D-TL's 150°C (TJ) rating. For applications requiring extended temperature performance, RT7306DGS (125°C) or UCC28811D may be more appropriate.

Q: What does MSL rating 3 (168 Hours) mean for AP1685MTR-G1 and RT7306DGS?

A: MSL 3 (168 Hours) indicates these parts must be used within 168 hours of moisture exposure after packaging. Controlled storage and handling procedures are required. LYT2004D-TL and UCC28811D with MSL 1 (Unlimited) do not have this restriction.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts carry ROHS3 Compliant status, matching the main part's RoHS Compliant designation. All parts are REACH Unaffected, ensuring regulatory alignment for production use.

Q: Which substitute part has the highest inventory availability?

A: AL9901FDF-13 has the highest inventory with 8890 pcs in stock, followed by AP1685MTR-G1 with 40300 pcs. RT7306DGS has 10709 pcs, and UCC28811D has 3400 pcs available.