LNK304G Equivalent & Substitute Parts

Part Overview

The LNK304G is an offline switch IC from Power Integrations' LinkSwitch®-TN series, designed for non-isolated power conversion applications utilizing Buck, Buck-Boost, and Flyback topologies. This component integrates an internal switch with comprehensive fault protection including current limiting, open loop control, over-temperature, and short-circuit protection.

The LNK304G carries an Obsolete product status. Identifying suitable substitute components is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production requirements for applications currently utilizing this part.

Substiute Parts

LNK304G

Power IntegrationsIn Stock: 1566LNK304G Datasheet

Current PartRFQ

LNK304GN-TL

Power IntegrationsIn Stock: 55189LNK304GN-TL Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LNK304G is determined by strict alignment across the following critical parameters:

Electrical Compatibility Parameters:

• Voltage breakdown rating (700V)
• Switching frequency (66kHz)
• Duty cycle (69%)
• Topology support (Buck, Buck-Boost, Flyback)
• Fault protection features (Current Limiting, Open Loop, Over Temperature, Short Circuit)
• Operating temperature range (-40°C ~ 150°C)
• Internal switch configuration (Yes)
• Output isolation type (Non-Isolated)

Mechanical Compatibility Parameters:

• Package type (8-SMD, 7 Leads, Gull Wing)
• Supplier device package designation (SMD-8B)
• Mounting type (Surface Mount)

Manufacturer Consistency:

• All substitute parts must originate from Power Integrations
• All substitute parts must belong to the LinkSwitch®-TN series

The LNK304GN-TL qualifies as a direct substitute based on complete alignment across all electrical and mechanical parameters listed above.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: LNK304GN-TL

The LNK304GN-TL is the direct functional equivalent of the LNK304G. All electrical and mechanical parameters are identical, ensuring pin-compatible and functionally equivalent operation in existing circuit designs.

Compliance Advantages:

The LNK304GN-TL carries Active product status, ensuring long-term availability and ongoing manufacturer support. This part is RoHS Compliant, meeting current environmental and regulatory requirements for new designs and production runs. The LNK304G, classified as RoHS non-compliant and Obsolete, presents supply chain risk and regulatory compliance challenges for ongoing manufacturing.

Moisture Sensitivity Consideration:

The LNK304GN-TL has a Moisture Sensitivity Level (MSL) rating of 4 (72 Hours), compared to the LNK304G's MSL 1 (Unlimited). This indicates stricter handling and storage requirements. The LNK304GN-TL must be stored in controlled humidity environments and used within 72 hours of package opening. Standard moisture-control procedures and desiccant packaging are required during storage and transport.

Inventory and Supply:

The LNK304GN-TL is available in high volume (55,100 Pcs New Original In Stock) with Cut Tape and Digi-Reel® packaging options, supporting both prototype and production-scale requirements.

Frequently Asked Questions (FAQ)

Q: Can the LNK304GN-TL be used as a direct replacement for the LNK304G in existing designs?

A: Yes. The LNK304GN-TL is electrically and mechanically identical to the LNK304G across all functional parameters. No circuit modifications are required. Pin configuration, voltage ratings, switching frequency, topology support, and fault protection features are identical.

Q: What is the difference between the LNK304G and LNK304GN-TL?

A: The primary differences are product status, regulatory compliance, and packaging format. The LNK304G is Obsolete and RoHS non-compliant. The LNK304GN-TL is Active and RoHS Compliant. The LNK304GN-TL is supplied in Cut Tape and Digi-Reel® formats. Functionally, both parts are equivalent.

Q: Why is the LNK304G marked as Obsolete?

A: The LNK304G has reached end-of-life status with Power Integrations. The LNK304GN-TL represents the current production equivalent. Existing inventory of the LNK304G is limited (1,537 Pcs), while the LNK304GN-TL is actively manufactured with substantial inventory availability.

Q: What does MSL 4 (72 Hours) mean for the LNK304GN-TL?

A: Moisture Sensitivity Level 4 indicates the component must be used within 72 hours of opening the original moisture-barrier packaging. After 72 hours of exposure to ambient humidity, the component must be baked at specified temperature and humidity conditions before use. Standard moisture-control procedures, desiccant packs, and sealed storage are required.

Q: Are there any other substitute parts available for the LNK304G?

A: Based on the provided parameters, the LNK304GN-TL is the only listed direct substitute. Both parts share identical electrical and mechanical specifications and belong to the same LinkSwitch®-TN series from Power Integrations.

Q: Is the 8-SMD package compatible with standard PCB assembly equipment?

A: Yes. The 8-SMD (7 Leads), Gull Wing package is a standard surface-mount configuration compatible with conventional pick-and-place and reflow soldering processes. The SMD-8B supplier device package designation confirms standard SMD assembly compatibility.

Q: Can the LNK304GN-TL support the same topologies as the LNK304G?

A: Yes. Both parts support identical topologies: Buck, Buck-Boost, and Flyback. Operating frequency (66kHz), duty cycle (69%), and all fault protection features are identical.

Q: What is the operating temperature range for both parts?

A: Both the LNK304G and LNK304GN-TL operate across -40°C to 150°C junction temperature (TJ). This range is identical for both components.